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CN100571419C - Code modulation and demodulation system and signal transmitting and receiving method thereof - Google Patents

Code modulation and demodulation system and signal transmitting and receiving method thereof Download PDF

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Publication number
CN100571419C
CN100571419C CNB2004800441831A CN200480044183A CN100571419C CN 100571419 C CN100571419 C CN 100571419C CN B2004800441831 A CNB2004800441831 A CN B2004800441831A CN 200480044183 A CN200480044183 A CN 200480044183A CN 100571419 C CN100571419 C CN 100571419C
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data
soft
output
sent
qpsk
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CN101040540A (en
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张峻峰
张忠培
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3488—Multiresolution systems

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention relates to a transmitting system, a receiving system, a coding modulation demodulation system composed of the transmitting system and the receiving system, and a method for transmitting and receiving signals of the coding modulation demodulation system. The receiver converts the higher signal-to-interference ratio originally needed by the high-order quadrature amplitude demodulation into the lower signal-to-interference ratio only needed by QPSK demodulation, thereby bringing demodulation gain. Meanwhile, on the premise of ensuring the communication quality, the QPSK demodulation is obviously simpler than the high-order quadrature amplitude modulation, so that the realization complexity of the multi-order QAM modulation and demodulation is effectively improved. Meanwhile, unbalanced forward coding redundancy processing is carried out on information of different constellation positions, so that the signal-to-interference ratio between constellations and the quality imbalance are effectively utilized, and the coding efficiency is improved on the whole.

Description

The method for transmitting and receiving of a kind of coding modulation and demodulation system and signal thereof
Technical field
The present invention relates to the method for transmitting and receiving of coding modulation and demodulation system in a kind of mobile communication system and signal thereof, relate in particular at system and the method thereof of using channel decoding and quadrature amplitude modulation demodulation.
Background technology
Quadrature amplitude modulation (QAM) is a kind of advanced person's a modulation-demodulation technique, has higher band efficiency, but it is to obtain its operating factor of highband to sacrifice its anti-interference, it is different from four-phase phase place keying (QPSK), QPSK is a kind of permanent envelope modulation technology, its entrained information fully on phase place, the no matter decay on the amplitude and how seriously disturb, as long as the phase place of modulation signal does not make a mistake, just can not cause information dropout.As shown in Figure 1, quadrature amplitude modulation is a kind of non-permanent envelope modulation technology, the poor-performing of its anti-nonlinear distortion.
As can be seen from Figure 1, the 16QAM modulation has three kinds of level, 12 kinds of phase places, and than the level unanimity of QPSK, 4 kinds of phase places are compared, and complicated many, the modulation of high-order is complicated more more, but its availability of frequency spectrum is high more.
Following table is different QAM modulation constellation characteristics comparison sheet:
Modulation Average power Minimum range Peak-to-average ratio/dB Minimum differ (°)
16QAM 10 0.471 1.8(2.6) 16.9
32QAM 20 0.343 10.9
64QAM 42 0.202 2.333(3.7) 7.7
128QAM 82 0.153 5.1
256QAM 170 0.094 2.647(4.2) 3.7
1024QAM 682 0.046 2.818(4.5) 1.8
Annotate: the minimum range perseverance gets 2 during the average power comparison, and amplitude peak is made as 1 during the minimum range comparison, and peak-to-average ratio is to determine when average power is limited.
It can be seen from the table: the order of modulation of QAM is high more, and minimum range (minimum Eustachian distance) is more little, and peak-to-average ratio is big more, and it is more little that minimum differs.
Peak-to-average ratio is big more, and the nonlinear distortion ability that anti-nonlinear power amplifier caused is poor more; Minimum euclid distance is more little, and the interference performance of anti-Gauss's white noise is weak more; It is more little that minimum differs, and anti-phase jitter ability is poor more, strong more to the sensitiveness dependence of clock recovery accuracy.Main conclusions are: the order of modulation of QAM is high more, can not resist the quick variation of mobile telecommunication channel more, so seldom use the high-order QAM technology in mobile communication system.
After common a certain modulation signal transmitted through mobile telecommunication channel, following several variation can take place in signal:
1) signal amplitude has different decay, and attenuation generally all can ceaselessly change, and being embodied on the planisphere is exactly that constellation dwindles;
2) channel can produce various noises, relatively is typically white Gaussian noise, makes constellation point fuzzy;
3) can produce intersymbol interference and interchannel interference;
4) if demodulating system is required to move, Doppler effect can be apparent in view;
5) owing to repeatedly reflect (cable TV channel etc.) or Rayleigh fading, multidiameter (channels of various wireless transmission) etc., signal amplitude can distort, and constellation can be expanded into irregular shape;
6) because the local oscillator clock of transmitting terminal and receiving terminal is inconsistent, the time-varying characteristics of tuner, down-conversion or the like circuit and channel, signal phase can suffer damage in transmission, cause phase jitter, and, the uncertainty that is used for the frequency of the radio-frequency oscillator of down conversion on carrier frequency and the intermediate frequency can cause a very big frequency deviation, is embodied on the planisphere to rotate.
Correspondingly, a common demodulator must be accomplished:
1) to the input signal bandpass filtering;
2) matched filtering of the corresponding pulse shaping of making a start is set to eliminate intersymbol interference;
3) adjust input signal amplitude;
4) estimate to drive away carrier component;
5) adopt balancing technique with compensate for channel, eliminate the influence of dispersing;
6) recover symbol clock and carry out timing judgement with acquisition pulse amplitude and phase place;
7) actual pulse amplitude and the phase place that sends of judgement;
8) because the existence of chnnel coding must have corresponding channel-decoding to reduce the error rate.
Find out by above process for the demodulation of QAM modulation, technology realizes it being very complicated, if can pass through certain means, the modulation and demodulation of QAM being reduced to the multiple arithmetic of QPSK, and guaranteeing demodulation quality, is effectively to reduce the implementation complexity of modulating demodulating system especially.
Theory can prove that the multilevel quadrature am signals can be launched into by several four-phase phase place keyings (QPSK) combination linear and make up.Can utilize this theory significantly to improve the complexity of modulation-demodulation technique.
Found out by Fig. 1 that in addition constellation point peripheral on the planisphere obviously has higher signal interference ratio, thereby obtains error performance preferably, and the constellation point signal interference ratio of inner ring is poor slightly, error performance is also poor slightly, the disequilibrium of Here it is QAM modulation technique signal interference ratio and quality.
Therefore, tradition high-order QAM modulation-demodulation technique is not considered to adopt the method layering of a plurality of four-phase phase place keyings (QPSK) combination to handle to reduce requirement and the implementation complexity to signal interference ratio the modulation and demodulation of QAM, fully do not combine with the signal interference ratio that utilizes QAM modulation technique outer ring and inner ring constellation and the disequilibrium feature of quality yet, do not make full use of the efficient of high-order QAM modulation technique with the channel decoding technology.
Disclosure of the Invention
Technical problem to be solved by this invention is to provide a kind of coding modulation and demodulation system of being made up of emission system and receiving system and the method that transmits and receives of signal thereof, adopt the method layering of a plurality of four-phase phase place keyings (QPSK) combination to handle the modulation and demodulation of QAM to reduce complexity to the requirement and the realization of signal interference ratio, and fully combine with the signal interference ratio that utilizes QAM modulation technique outer ring and inner ring constellation and the disequilibrium feature of quality with the channel decoding technology, and make full use of the high-order QAM modulation technique, improved code efficiency on the whole.
To achieve these goals, the invention provides a kind of emission system, its characteristics are, comprise a data extractor, one first encoder, one second encoder, one first interleaver, one second interleaver, an XOR device, one first qpsk modulator, one second qpsk modulator, one first multiplier and an adder;
Wherein, the primary signal source enters described data extractor, is converted into that two paths of data is delivered to first encoder respectively and second encoder is handled;
Data after data extractor is handled are delivered to first encoder and second encoder, carry out the channel error correction coding respectively at first encoder and second encoder;
Data through the channel error correction coding are sent from first encoder and second encoder respectively, enter first interleaver and second interleaver is done interleaving treatment, first interleaver carries out interleaving treatment to data, and data processed directly enters first qpsk modulator and carries out the QPSK modulation; The data of being sent by the data after the second interleaver interleaving treatment and first interleaver are sent into the XOR device together and are carried out sending into after XOR is handled second qpsk modulator again and do the QPSK modulation;
Send into first multiplier by the data that first qpsk modulator is sent, multiply by gain, obtain first data flow, the data of being sent by second qpsk modulator are second data flow, first data flow and second data flow enter adder and carry out plural addition, the latter incorporated data of adder output two-way hierarchical coding form one tunnel synthetic quadrature amplitude modulation signal;
The synthetic quadrature amplitude modulation signal in this road is transformed to the multichannel data source after the transmitter unit group is launched from antenna through a string and converter.
Above-mentioned emission system, its characteristics are that the encoding rate of described first encoder is equal to or greater than the encoding rate of described second encoder.
Above-mentioned emission system, its characteristics are that the encoding rate of the data separating ratio of described data extractor and described first encoder and second encoder is complementary.
Above-mentioned emission system, its characteristics are that described first encoder and second encoder are convolution coder or Turbo encoder.
Above-mentioned emission system, its characteristics are that each circuit-switched data source is all undertaken just launching after the spread processing by one second multiplier.
The present invention also provides a kind of receiving system that is used to receive the source data signals of launching as above-mentioned emission system, its characteristics are, comprise a serial interference cancellation iterative receiver, one first deinterleaver, one second deinterleaver, one first decoder, one second decoder and a data collector:
Wherein, the successive interference cancellation iterative receiver receives aerial standard quadrature amplitude modulation signal, carries out the successive interference cancellation iteration and receives processing, forms the soft Bit data after two-way receives the QPSK demodulation;
The soft Bit data of the first via send first deinterleaver deinterleaves, and data send first decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
The second tunnel soft Bit data send second deinterleaver deinterleaves, and data send second decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
Data collector is collected first decoder and second decoder decoding data separately, carries out data multiplex, finishes the whole receiving course that quadrature amplitude modulation is separated mediation decoding.
Above-mentioned receiving system, its characteristics are that described successive interference cancellation iterative receiver comprises a detector, one first qpsk demodulator, one first hard decision device, one first subtracter, one second qpsk demodulator, one first symbol reformer, one second subtracter, one the 3rd qpsk demodulator, one second hard decision device, one the 3rd subtracter, one the 4th qpsk demodulator and one second symbol reformer:
The quadrature amplitude modulation signal that detector is received air interface detects, and is used for eliminating intersymbol interference;
The data of detector output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into first subtracter with the data of detector output after soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter;
First subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform;
The soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter;
The output of second subtracter is the result send the 3rd qpsk demodulator, carry out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter;
The 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the second symbol reformer and carry out symbol and reform;
The data of the 3rd qpsk demodulator output form the soft Bit data of the first via;
The data of second symbol reformer output form the second tunnel soft Bit data.
Above-mentioned receiving system, its characteristics are, also comprise one first soft output combiner, one second soft output combiner, one the 3rd soft output combiner, one the 4th soft output combiner, one the 3rd interleaver and one the 4th interleaver,
Wherein, the soft Bit data of being sent by the successive interference cancellation iterative receiver of two-way is introduced into the first soft output combiner respectively, the soft output signal of the second soft output combiner and last iteration merges, the two-way merging data is respectively by first deinterleaver, send into first decoder after second deinterleaver deinterleaves and second decoder is deciphered, the soft output signal that soft data after the decoding enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, data after the merging interweave again by the 3rd interleaver and the 4th interleaver, the successive interference cancellation iterative receiver is returned in spread spectrum and modulation, eliminate the data that demodulated, enter same next time iterative process then, through the iterative process of a pre-determined number, the data of sending from the 3rd soft output combiner and the 4th soft output combiner restore the source data of emission after data collector merges.
Above-mentioned receiving system, its characteristics are, described successive interference cancellation iterative receiver also comprises a QAM modulator, one frequency multiplier, one the 4th subtracter and a despreader, data after wherein the 3rd interleaver and the 4th interleaver interweave form the last iteration data after frequency multiplier spread spectrum and QAM modulators modulate, the quadrature amplitude modulation signal that air interface is received deducts the last iteration data by the 4th subtracter earlier, send detector to detect again after offsetting interference, by despreader the data of detector output being carried out despreading then, is output again after the data of bit-level with the data processing of chip-level.
Above-mentioned receiving system, its characteristics are that described detector can be equalizer, matched filter or RAKE detector.
The present invention also provides a kind of coding modulation and demodulation system, and it comprises an emission system and a receiving system, and its characteristics are:
Described emission system comprises a data extractor, one first encoder, one second encoder, one first interleaver, one second interleaver, an XOR device, one first qpsk modulator, one second qpsk modulator, one first multiplier and an adder;
Wherein, the primary signal source enters described data extractor, is converted into that two paths of data is delivered to first encoder respectively and second encoder is handled;
Data after data extractor is handled are delivered to first encoder and second encoder, carry out the channel error correction coding respectively at first encoder and second encoder;
Data through the channel error correction coding are sent from first encoder and second encoder respectively, enter first interleaver and second interleaver is done interleaving treatment, first interleaver carries out interleaving treatment to data, and data processed directly enters first qpsk modulator and carries out the QPSK modulation; The data of being sent by the data after the second interleaver interleaving treatment and first interleaver are sent into the XOR device together and are carried out sending into after XOR is handled second qpsk modulator again and do the QPSK modulation;
Send into first multiplier by the data that first qpsk modulator is sent, multiply by gain, obtain first data flow, the data of being sent by second qpsk modulator are second data flow, first data flow and second data flow enter adder and carry out plural addition, the latter incorporated data of adder output two-way hierarchical coding form one tunnel synthetic quadrature amplitude modulation signal;
The synthetic quadrature amplitude modulation signal in this road is transformed to the multichannel data source after the transmitter unit group is launched from antenna through a string and converter;
Described receiving system comprises a serial interference cancellation iterative receiver, one first deinterleaver, one second deinterleaver, one first decoder, one second decoder and a data collector:
Wherein, the successive interference cancellation iterative receiver receives aerial standard quadrature amplitude modulation signal, carries out the successive interference cancellation iteration and receives processing, forms the soft Bit data after two-way receives the QPSK demodulation;
The soft Bit data of the first via send first deinterleaver deinterleaves, and data send first decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
The second tunnel soft Bit data send second deinterleaver deinterleaves, and data send second decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
Data collector is collected first decoder and second decoder decoding data separately, carries out data multiplex, finishes the whole receiving course that quadrature amplitude modulation is separated mediation decoding.
Above-mentioned coding modulation and demodulation system, its characteristics are that the encoding rate of first encoder of described emission system is equal to or greater than the encoding rate of described second encoder.
Above-mentioned coding modulation and demodulation system, its characteristics are that the encoding rate of the data separating ratio of the data extractor of described emission system and described first encoder and second encoder is complementary.
Above-mentioned coding modulation and demodulation system, its characteristics are that the successive interference cancellation iterative receiver of described receiving system comprises a detector, one first qpsk demodulator, one first hard decision device, one first subtracter, one second qpsk demodulator, one first symbol reformer, one second subtracter, one the 3rd qpsk demodulator, one second hard decision device, one the 3rd subtracter, one the 4th qpsk demodulator and one second symbol reformer:
The quadrature amplitude modulation signal that detector is received air interface detects, and is used for eliminating intersymbol interference;
The data of detector output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into first subtracter with the data of detector output after soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter;
First subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform;
The soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter;
The output of second subtracter is the result send the 3rd qpsk demodulator, carry out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter;
The 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the second symbol reformer and carry out symbol and reform;
The data of the 3rd qpsk demodulator output form the soft Bit data of the first via;
The data of second symbol reformer output form the second tunnel soft Bit data.
Above-mentioned coding modulation and demodulation system, its characteristics are that described receiving system also comprises one first soft output combiner, one second soft output combiner, one the 3rd soft output combiner, one the 4th soft output combiner, one the 3rd interleaver and one the 4th interleaver,
Wherein, the soft Bit data of being sent by the successive interference cancellation iterative receiver of two-way is introduced into the first soft output combiner respectively, the soft output signal of the second soft output combiner and last iteration merges, the two-way merging data is respectively by first deinterleaver, send into first decoder after second deinterleaver deinterleaves and second decoder is deciphered, the soft output signal that soft data after the decoding enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, data after the merging interweave again by the 3rd interleaver and the 4th interleaver, the successive interference cancellation iterative receiver is returned in spread spectrum and modulation, eliminate the data that demodulated, enter same next time iterative process then, through the iterative process of a pre-determined number, the data of sending from the 3rd soft output combiner and the 4th soft output combiner restore the source data of emission after data collector merges.
Above-mentioned coding modulation and demodulation system, its characteristics are, the successive interference cancellation iterative receiver of described receiving system also comprises a QAM modulator, one frequency multiplier, one the 4th subtracter and a despreader, data after wherein the 3rd interleaver and the 4th interleaver interweave form the last iteration data after frequency multiplier spread spectrum and QAM modulators modulate, the quadrature amplitude modulation signal that air interface is received deducts the last iteration data by the 4th subtracter earlier, send detector to detect again after offsetting interference, by despreader the data of detector output being carried out despreading then, is output again after the data of bit-level with the data processing of chip-level.
The present invention also provides a kind of method that transmits and receives of signal, and its characteristics are, may further comprise the steps:
Step 1, original source is converted into two paths of data;
Step 2, two paths of data are carried out chnnel coding respectively;
Step 3, coding back data are carried out interleaving treatment respectively;
Step 4, the two paths of data after the interleaving treatment are carried out XOR and are handled the second new circuit-switched data of formation, first via data no change;
Step 5, the first via data and second circuit-switched data are carried out the QPSK modulation respectively;
Step 6, first via modulating data takes advantage of 2;
Step 7, two-way modulating data carry out launching after plural addition forms one tunnel quadrature amplitude modulation signal that synthesizes;
The method that step 8, synthetic quadrature amplitude modulation signal are used the successive interference cancellation iteration receives, soft Bit data behind the formation two-way receiving demodulation;
After receiving and separate, step 9, two-way transfer soft Bit data to be deinterlaced respectively and to decipher;
Step 10, two-way decoding back data are multiplexed into the received signal of correct reduction.
The method that transmits and receives of above-mentioned signal, its characteristics are, in the step 1, form two paths of data two egress rates can according to 1: 1 concern average mark from, also can separate egress rate according to the inequality relation, the data rate of first outlet is more than or equal to the data rate to second outlet.
The method that transmits and receives of above-mentioned signal, its characteristics are that described step 8 further may further comprise the steps:
Step 8a, aerial signal is received and demodulation by detector, is used for eliminating intersymbol interference;
Step 8b, the data of detector output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data;
Acquisition hard decision result sent into first subtracter with the data of detector output after step 8c, soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter;
Step 8d, first subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform;
Step 8e, the soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter;
Step 8f, the output of second subtracter is the result send the 3rd qpsk demodulator, carries out the QPSK demodulation, exports soft demodulating data, and the data of the 3rd qpsk demodulator output form the soft Bit data of the first via; Simultaneously, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter;
Step 8g, the 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the second symbol reformer and carry out symbol and reform, and the data of second symbol reformer output form the second tunnel soft Bit data.
The method that transmits and receives of above-mentioned signal, its characteristics are, in step 8d/8g, the principle that symbol is reformed is relevant with the quadrant of the demodulation symbol of first qpsk demodulator/the 3rd qpsk demodulator, if second qpsk demodulator/the 4th qpsk demodulator is sent soft Bit data X+Yj, the process of sign symbol reformation is as follows so:
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is a first quartile, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is X+Yj;
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is second quadrant, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is-X+Yj;
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is a third quadrant, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is-X-Yj;
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is a four-quadrant, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is X-Yj.
The method that transmits and receives of above-mentioned signal, its characteristics are, in step 9, in ten, be deinterlaced respectively again and decipher after soft Bit data of the described first via and the first soft output signal that enters the first soft output combiner and the second soft output combiner and last iteration respectively of the second tunnel soft Bit data merge, the soft output signal that decoding back soft data enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, data after the merging are returned after interweave again spread spectrum and modulation respectively, carry out the successive interference cancellation iteration, the output result after will deciphering again after the iteration of a pre-determined number is multiplexed into the received signal of correct reduction.
The method that transmits and receives of above-mentioned signal, its characteristics are that this number of iterations is 2～8 times.
Brief Description Of Drawings
Fig. 1 is the modulation constellation of typical 16QAM in the prior art;
Fig. 2 is the structure chart of the emission system in the embodiment of the invention;
Fig. 3 is the structure chart of receiving system in the embodiment of the invention;
Fig. 4 is the cut-away view of successive interference cancellation iterative receiver in the receiving unit of the present invention;
Fig. 5 is the performance simulation structure and the contrast of the embodiment of the invention.
Realize best mode of the present invention
Below in conjunction with drawings and Examples the present invention is described in further details.
Present embodiment is at emission of four antennas and four antenna receiving systems in many antenna emissions and the many antennas receiving system (MIMO), adopts high-order orthogonal amplitude modulation(PAM) (16QAM) and the hierarchical modulation coding and the demodulation decoding system of design.
As shown in Figure 2: issue that a certain user's data enters first encoder respectively after by data separating and second encoder carries out chnnel coding, the encoding rate of first encoder is 1/2 or 1/3 in the present embodiment, the encoding rate of second encoder is 1/3, guarantee the encoding rate of the encoding rate of first encoder more than or equal to second encoder, data separating is decided on the encoding rate of two encoders to the ratio of first encoder and the second encoder distributing data, if the encoding rate of first encoder and second encoder all is 1/3, data separating is separated according to 1: 1 relation exactly so, if first encoder adopts 1/2, second encoder adopts 1/3, and data separating needs to separate according to 3: 2 relation so.The bit that for example enters separator is [a, b, c, d, e], and when the encoding rate of first encoder and second encoder all was 1/3, the data that are distributed to first encoder were [a, b] so, and the data that are distributed to second encoder are [c, d], and follow-up analogizes; When the encoding rate of first encoder and second encoder was 1/2 and 1/3, the data that are distributed to first encoder were [a, b, c], the data that are distributed to second encoder are [d, e], follow-uply analogize, use different encoding rates by modulating two encoders, can preferably under the situation, provide redundant less at outer ring constellation signal interference ratio, the channel error correction coding that encoding rate is higher, under the relatively poor situation of inner ring constellation signal interference ratio, provide redundant more, the channel error correction coding that encoding rate is lower;
Data enter first interleaver and second interleaver interweaves after the coding, and interleaving technology is a prior art.First via data after the A road interweaves enter first qpsk modulator and carry out the QPSK modulation, first via data after second circuit-switched data after the B road interweaves and A road interweave are carried out entering behind the XOR second qpsk modulator and are carried out the QPSK modulation, the purpose of carrying out XOR is that natural code is converted to Gray code, thereby makes receiving terminal possess better detection performance.A, B two-way modulating data are divided into four circuit-switched data sources by serial-parallel converter again through after the complex adder x 1, x 2, x 3, x 4, each road all pass through the second multiplier group with initial data by C1～Ck channel code spread spectrum, the data behind the spread spectrum are sent from four antennas through transmitter unit group TX then.
A road device is used to produce the high order bit (1,2 bit) of the 16QAM after the modulation, and B road device is used to produce the low-order bit (3,4 bits) of modulation back 16QAM.
The 16QAM modulation symbol that obtains is:
x k n ( t ) = 2 { - b k , 0 n ( t ) - j b k , 1 n ( t ) } + { - b k , 0 n ( t ) b k , 2 n ( t ) - j b k , 1 n ( t ) b k , 3 n ( t ) }
Here b k , 0 n , b k , 1 n , b k , 2 n , b k , 3 n ∈ { - 1 , + 1 } .
To annotate: 2 system bits 1 are mapped as+1,0 be mapped as-1, as shown in the table:
00 -1，-1
10 +1，-1
11 +1，+1
01 -1，+1
For example: input bit is [1001], and the constellation point that can obtain modulator 1 according to following formula is: [2 2], and the constellation point [1 1] of modulation 2, so x k n ( t ) = { - 1 + 3 j } .
As shown in Figure 3, receiving system comprises successive interference cancellation iterative receiver, the first soft output combiner, the second soft output combiner, first deinterleaver, second deinterleaver, first decoder, second decoder, the 3rd soft output combiner, the 4th soft output combiner, the 3rd interleaver, the 4th interleaver, data collector.
The quadrature amplitude modulation signal that the successive interference cancellation iterative receiver is received air interface carries out the successive interference cancellation iteration and receives operation, finish and eliminate intersymbol interference, despreading and hierarchical de-modulating function, form the soft Bit data of two-way demodulation, the soft output that the soft Bit data of two-way demodulation enters the first soft output combiner and the second soft output combiner and last iteration respectively merges, and the two-way merging data is respectively by sending first decoder and second decoder to decipher after first deinterleaver and second deinterleaver deinterleaves.The soft output that decoding back soft data enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, merge the back data and return the successive interference cancellation iterative receiver by interweave again spread spectrum and the modulation of the 3rd interleaver and the 4th interleaver, eliminate the data that demodulated, carry out same next time iterative process then, iterative process through certain number of times, decoder output bit information reliability progressively improves, and merges the back from the result of the 3rd soft output combiner and the 4th soft output combiner through data collector this moment and just can correctly reduce the source data of launching.
For the error bit information that reduces to export soft information causes error propagation in signal subtraction, in the successive interference cancellation iterative receiver, used the weight setting method of two kinds of soft output combiners, soft output combiner is weighted summation with the soft information of last iteration and the soft information of this input, the optimum weights of this secondary data are 0.9 in the first and second soft output combiners, and the optimum weights of the data of last iteration are 0.1.The optimum weights of this secondary data are 0.75 in the third and fourth soft output combiner, and the optimum weights of the data of last iteration are 0.25.
Iteration between receiver and the decoder can unlimitedly go on, and generally speaking, considers performance and the relation that takies hardware resource, and optimum iterations is between 2～8 times.
As shown in Figure 4: the successive interference cancellation iterative receiver inside of receiving system comprises:
Detector, despreader, first qpsk demodulator, first hard decision, first subtracter, second qpsk demodulator, the reformation of first symbol, second subtracter, first qpsk demodulator, second hard decision, the 3rd subtracter, second qpsk demodulator, the reformation of second symbol, the 4th subtracter, 16QAM modulator and frequency multiplier.
Aerial signal deducts the established data of last iteration by the 4th subtracter, offset disturb after, send detector to detect, the realization of detector can be equalizer, matched filter or RAKE receiver etc., detector is used for eliminating intersymbol interference.
The data that detector detects send despreader to carry out despreading, are the data of bit-level with the data processing of chip-level.
The data of despreader output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into first subtracter with the data of detector output after soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter.
First subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform.
The soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter.
The output of second subtracter is the result send the 3rd qpsk demodulator, carry out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter.
The 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data.And enter the second symbol reformer and carry out symbol and reform.
The data of the 3rd qpsk demodulator output form the soft Bit data b1 of the first via, b2.
The data of second symbol reformer output form the second tunnel soft Bit data b3, b4.
The two-way of sending into by external unit through the data after interweaving in the successive interference cancellation iterative receiver through 16QAM modulation again and again the process of spread spectrum send into the 4th subtracter, it has been after determining the data of information that aerial signal deducts these, can think to have deducted interference, send into detector, begin new iterative demodulation process.
The principle that symbol is reformed is relevant with the quadrant of the demodulation symbol of the 3rd qpsk demodulator, if the 4th qpsk demodulator is sent soft Bit data X+Yj, the process of sign symbol reformation is as follows so:
If the quadrant of the 3rd qpsk demodulator symbol is a first quartile, then the soft bit of b3b4 correspondence is X+Yj;
If the quadrant of the 3rd qpsk demodulator symbol is second quadrant, then the soft bit of b3b4 correspondence is-X+Yj;
If the quadrant of the 3rd qpsk demodulator symbol is a third quadrant, then the soft bit of b3b4 correspondence is-X-Yj;
If the quadrant of the 3rd qpsk demodulator symbol is a four-quadrant, then the soft bit of b3b4 correspondence is X-Yj;
As a same reason, the symbol behind second qpsk demodulator is reformed also has identical relation with the symbol quadrant of first qpsk demodulator.
To a certain antenna, below with the simple demodulation mechanism of verifying successive interference cancellation iterative receiver inside of calculating:
r 2=r-r 1, r2 is second qpsk demodulator input data, and r is for receiving data, and r1 is first qpsk demodulator demodulation output and is mapped as the QPSK modulation symbol.
Suppose to receive data and be output as r=-1+3j through detection and despreading; The first qpsk demodulator hard decision symbol is [1,0], and promptly the QPSK symbol is r 1=-2+2j, corresponding to second qpsk demodulator, obtain demodulation symbol: r 2=1+j, and the process symbol is restructured as r 2=-1+j.Why needing unit such as the 3rd qpsk demodulator, the 4th qpsk demodulator to participate in the iterative process of demodulation for the second time, is for the interference of separating the low level that a timing high position contains is for the first time removed.
The process that sign symbol is reformed is corresponding to the XOR of coding stage, but do not use the computing opposite with XOR here, mainly is the excellent properties for fear of the computing of XOR loss soft symbol.2 QPSK that two demodulators restore before the modulation merging modulate soft information.And these two the soft information of modulation are carried out QPSK respectively and be mapped as 2 system symbols [1,0,0,1].Thereby complete errorless original emission information source that recovers.
In whole mimo antennas receiving system, exist two cover iteration processes like this, the interference cancellation iterative receiver is to the iterative relation between the decoding unit, can offset many antennas and transmit and receive interference between antenna under the condition, the interference cancellation iterative receiver embedded twice iterative relation of QPSK, can effectively offset 16QAM modulation interference through causing after the air traffic channel.
Following steps of a method in accordance with the invention and key parameter have provided the simulation result of performance comparison, as shown in Figure 5:
The simulated conditions setting of embodiment:
1) 4X4 MIMO link (NT=NR=4);
2) 16QAM modulation;
3) spreading factor: Q=16;
4) K=10 orthogonal intersection is reused on all antennas;
5) interweave and coded block size: 1000 * 5114 information bits;
6) Rayleigh propagation channel:
7) chromatic dispersion decline, 3 chip time delays, 3 footpaths, 3km/h;
8) 1/3 code check, 8-state turbo coding, 1/2 code check adopt drilling method to realize (pressing 3GPP25.212);
9) Max-Log map (soft-input, soft-output) decoding algorithm;
10) 6 iteration turbo decoding;
11) ideal communication channel parameter information.
12) when hierarchical modulation, a kind of method is to have adopted the Turbo code of same-code rate (1:3) that high low level (1,2,3,4 bits from high to low) is encoded, a kind of is to have adopted the Turbo code of different coding rate that high low level is encoded, high order bit adopts 1/2 encoding rate, and low level bit adopts 1/3 encoding rate.Not adopting the encoding rate of APP (maximum a posteriori probability reception) method of hierarchical modulation is 1/3.
13) do not adopt the iterative detection structure between detector and the decoder.
Maximum a posteriori probability (APP) reception that has provided the not hierarchical coding of 16QAM modulation among Fig. 5 is compared with the performance that the hierarchical coding maximum a posteriori probability receives frame error rate and bit mistake code check.Because after adopting hierarchical coding, receiving terminal adopts the QPSK modulation, the requirement of received signal to noise ratio and the 16QAM demodulation of standard is decreased, therefore, even do not adopt the advanced configuration of iterative detection between detector and the decoder, also can in system, obtain the gain of nearly 0.5dB in the overall performance.The benefit of its maximum has been to reduce the complexity of the maximum a posteriori probability detection of receiving terminal simultaneously.
The required extra cost of this hierarchical coding is that transmitting terminal has increased an encoder, need increase demodulator, Turbo decoder of increase of a QPSK at receiving terminal.On the whole, having reduced implementation complexity effectively by the hierarchical coding scheme, improved systematic function, but increased the scale that part realizes circuit a little, is a kind of effective implementation method.
Inventive concept is not limited to offset demodulating system at two-layer modulating system of 16QAM and two-layer serial, also is applicable to the more multilayer system of high-order QAM modulation and demodulation simultaneously.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Industrial applicability
After adopting the present invention, the information source of preparation being carried out multistage QAM modulation is divided into several component sources through processing and carries out independently four-phase phase place keying (QPSK) modulation, and the demodulating system by the successive interference cancellation iteration, the demodulation of multistage QAM is decomposed into the some grades of QPSK demodulation that serial offsets. Only need the required lower signal interference ratio of QPSK demodulation so that receiver is converted to the needed higher signal interference ratio of high-order orthogonal amplitude demodulation originally, thereby brought demodulation gain. Under the prerequisite that guarantees communication quality, because the demodulation of QPSK is significantly simple than high-order orthogonal amplitude modulation(PAM), thereby effectively improved the implementation complexity of multistage QAM modulation /demodulation simultaneously.
After adopting the present invention in addition, unbalanced forward coding is redundant to be processed by the information of various constellations position is carried out, at outer ring constellation signal interference ratio preferably in the situation, provide redundant less, the channel Error Correction of Coding that encoding rate is higher, in the relatively poor situation of inner ring constellation signal interference ratio, provide redundant more, the channel Error Correction of Coding that encoding rate is lower, thereby under the prerequisite that guarantees signal interference ratio and quality, effectively utilize signal interference ratio between the constellation and the disequilibrium of quality, improved on the whole code efficiency.
And as a further improvement on the present invention, the thought that the present invention embodies can realize the multilayer system that high-order QAM more transmits and receives.

Claims (22)

1、一种发射系统，其特征在于，包括一数据分离器、一第一编码器、一第二编码器、一第一交织器、一第二交织器、一异或器、一第一QPSK调制器、一第二QPSK调制器、一第一乘法器和一加法器；1. A transmission system, characterized in that it includes a data separator, a first encoder, a second encoder, a first interleaver, a second interleaver, an exclusive OR, and a first QPSK modulator, a second QPSK modulator, a first multiplier and an adder; 其中，原始信号源进入所述数据分离器，被转化为两路数据分别送至第一编码器和第二编码器进行处理；Wherein, the original signal source enters the data separator, is converted into two channels of data, and is sent to the first encoder and the second encoder for processing; 数据分离器处理后的数据送到第一编码器和第二编码器，在第一编码器和第二编码器分别进行信道纠错编码；The data processed by the data separator is sent to the first encoder and the second encoder, and channel error correction encoding is performed on the first encoder and the second encoder respectively; 经过信道纠错编码的数据分别从第一编码器和第二编码器送出，进入第一交织器和第二交织器做交织处理，第一交织器对数据进行交织处理，处理过的数据直接进入第一QPSK调制器进行QPSK调制；由第二交织器交织处理后的数据和第一交织器送出的数据一起送入异或器进行异或处理后再送入第二QPSK调制器做QPSK调制；The data encoded by the channel error correction is sent from the first encoder and the second encoder respectively, and enters the first interleaver and the second interleaver for interleaving processing. The first interleaver performs interleaving processing on the data, and the processed data directly enters the The first QPSK modulator performs QPSK modulation; the data after the interleaving process by the second interleaver and the data sent by the first interleaver are sent to the exclusive OR device for exclusive OR processing and then sent to the second QPSK modulator for QPSK modulation; 由第一QPSK调制器送出的数据送入第一乘法器，乘以增益，得到第一数据流，由第二QPSK调制器送出的数据为第二数据流，第一数据流和第二数据流进入加法器进行复数相加，加法器输出两路分层编码后合并的数据，形成一路合成的正交幅度调制信号；The data sent by the first QPSK modulator is sent to the first multiplier, multiplied by the gain to obtain the first data stream, and the data sent by the second QPSK modulator is the second data stream, the first data stream and the second data stream Enter the adder for complex addition, and the adder outputs the combined data after two layers of coding to form a synthesized quadrature amplitude modulation signal; 该路合成的正交幅度调制信号经一串并变换器变换为多路数据源后经发射单元组从天线发射出去。The synthesized quadrature amplitude modulation signal is transformed into multiple data sources by a series-to-parallel converter, and then transmitted from the antenna through the transmitting unit group. 2、根据权利要求1所述的发射系统，其特征在于，所述第一编码器的编码率等于或大于所述第二编码器的编码率。2. The transmission system according to claim 1, wherein the coding rate of the first encoder is equal to or greater than the coding rate of the second encoder. 3、根据权利要求2所述的发射系统，其特征在于，所述数据分离器的数据分离比例与所述第一编码器和第二编码器的编码率相匹配。3. The transmission system according to claim 2, wherein the data separation ratio of the data separator matches the encoding rates of the first encoder and the second encoder. 4、根据权利要求3所述的发射系统，其特征在于，所述第一编码器和第二编码器为卷积编码器或Turbo编码器。4. The transmission system according to claim 3, wherein the first encoder and the second encoder are convolutional encoders or Turbo encoders. 5、根据权利要求3所述的发射系统，其特征在于，每一路数据源都通过一第二乘法器进行扩频处理后才进行发射。5. The transmission system according to claim 3, wherein each data source is transmitted after spread spectrum processing by a second multiplier. 6、一种用于接收如权利要求1所述的发射系统所发射的源数据信号的接收系统，其特征在于，包括一串行干扰对消迭代接收机、一第一解交织器、一第二解交织器、一第一译码器、一第二译码器和一数据收集器：6. A receiving system for receiving the source data signal transmitted by the transmitting system as claimed in claim 1, characterized in that it comprises a serial interference cancellation iterative receiver, a first deinterleaver, a first Two deinterleavers, a first decoder, a second decoder and a data collector: 其中，串行干扰对消迭代接收机接收空中的标准正交幅度调制信号，进行串行干扰对消迭代接收处理，形成两路接收QPSK解调后的软比特数据；Among them, the serial interference cancellation iterative receiver receives the standard quadrature amplitude modulation signal in the air, performs serial interference cancellation iterative reception processing, and forms two channels to receive soft bit data after QPSK demodulation; 第一路软比特数据送第一解交织器解交织，解交织后数据送第一译码器进行译码，译码完毕数据送数据收集器；The first path of soft bit data is sent to the first deinterleaver for deinterleaving, the deinterleaved data is sent to the first decoder for decoding, and the decoded data is sent to the data collector; 第二路软比特数据送第二解交织器解交织，解交织后数据送第二译码器进行译码，译码完毕数据送数据收集器；The second soft bit data is sent to the second de-interleaver for de-interleaving, the de-interleaved data is sent to the second decoder for decoding, and the decoded data is sent to the data collector; 数据收集器收集第一译码器和第二译码器各自的译码数据，进行数据复用，完成正交幅度调制解调和译码的整个接收过程。The data collector collects the respective decoding data of the first decoder and the second decoder, performs data multiplexing, and completes the entire receiving process of quadrature amplitude modulation, demodulation and decoding. 7、根据权利要求6所述的接收系统，其特征在于，所述串行干扰对消迭代接收机包括一检测器、一第一QPSK解调器、一第一硬判决器、一第一减法器、一第二QPSK解调器、一第一符号重整器、一第二减法器、一第三QPSK解调器、一第二硬判决器、一第三减法器、一第四QPSK解调器和一第二符号重整器：7. The receiving system according to claim 6, wherein said serial interference cancellation iterative receiver comprises a detector, a first QPSK demodulator, a first hard decision device, a first subtraction Device, a second QPSK demodulator, a first symbol reformer, a second subtractor, a third QPSK demodulator, a second hard decision device, a third subtractor, a fourth QPSK solution tuner and a second symbol reformer: 检测器对空中接收到的正交幅度调制信号进行检测，用来消除码间串扰；The detector detects the quadrature amplitude modulation signal received in the air to eliminate intersymbol interference; 检测器输出的数据送入第一QPSK解调器进行QPSK解调，输出软解调数据，软解调数据进入第一硬判决器后获得硬判决结果与检测器输出的数据一起送入第一减法器，检测器输出的数据减去硬判决结果输出第一减法器；The data output by the detector is sent to the first QPSK demodulator for QPSK demodulation, and the soft demodulated data is output. After the soft demodulated data enters the first hard decision device, the hard decision result is obtained and sent to the first hard decision device together with the data output by the detector. A subtractor, the data output by the detector subtracts the hard decision result and outputs the first subtractor; 第一减法器输出结果送第二QPSK解调器进行QPSK解调，获得软解调数据，并进入第一符号重整器进行符号重整；The output result of the first subtractor is sent to the second QPSK demodulator for QPSK demodulation to obtain soft demodulated data, and enter the first symbol reformer for symbol reformation; 检测器输出的数据和第一符号重整器输出的软数据都送入第二减法器，检测器输出的数据减去第一符号重整器输出的软数据，结果输出第二减法器；The data output by the detector and the soft data output by the first symbol reformer are all sent to the second subtractor, the data output by the detector subtracts the soft data output by the first symbol reformer, and the result is output to the second subtractor; 第二减法器输出结果送第三QPSK解调器，进行QPSK解调，输出软解调数据，软解调数据进入第二硬判决器后获得硬判决结果与检测器输出的数据一起送入第三减法器，检测器输出的数据减去第二硬判决器的结果输出第三减法器；The output result of the second subtractor is sent to the third QPSK demodulator to carry out QPSK demodulation and output soft demodulation data. After the soft demodulation data enters the second hard decision device, the hard decision result is obtained and sent to the second hard decision device together with the data output by the detector. Three subtractors, the data output by the detector subtracts the result of the second hard decision unit and outputs the third subtractor; 第三减法器输出结果送第四QPSK解调器进行QPSK解调，获得软解调数据，并进入第二符号重整器进行符号重整；The output result of the third subtractor is sent to the fourth QPSK demodulator for QPSK demodulation to obtain soft demodulated data, and enter the second symbol reformer for symbol reformation; 第三QPSK解调器输出的数据形成第一路软比特数据；The data output by the third QPSK demodulator forms the first soft bit data; 第二符号重整器输出的数据形成第二路软比特数据。The data output by the second symbol reformer forms a second path of soft bit data. 8、根据权利要求7所述的接收系统，其特征在于，还包括一第一软输出合并器、一第二软输出合并器、一第三软输出合并器、一第四软输出合并器、一第三交织器和一第四交织器，8. The receiving system according to claim 7, further comprising a first soft output combiner, a second soft output combiner, a third soft output combiner, a fourth soft output combiner, a third interleaver and a fourth interleaver, 其中，由串行干扰对消迭代接收机送出的两路软比特数据分别先进入第一软输出合并器、第二软输出合并器与上次迭代的软输出信号进行合并，两路合并数据分别通过第一解交织器、第二解交织器解交织后送入第一译码器和第二译码器进行译码，译码后的软数据分别进入第三软输出合并器和第四软输出合并器与上次迭代的软输出信号进行合并，合并后的数据通过第三交织器和第四交织器重新交织、扩频和调制返回串行干扰对消迭代接收机，对消掉已经解调出的数据，然后进入下一次同样的迭代过程，经过一预定次数的迭代过程，从第三软输出合并器和第四软输出合并器送出的数据经数据收集器合并后还原出发射的源数据。Among them, the two paths of soft bit data sent by the serial interference cancellation iterative receiver respectively enter the first soft output combiner, the second soft output combiner and the soft output signal of the last iteration to be combined, and the two paths of combined data are respectively After being deinterleaved by the first deinterleaver and the second deinterleaver, it is sent to the first decoder and the second decoder for decoding, and the decoded soft data enters the third soft output combiner and the fourth soft output combiner respectively. The output combiner is combined with the soft output signal of the last iteration, and the combined data is re-interleaved, spread and modulated by the third interleaver and the fourth interleaver, and returned to the serial interference cancellation iterative receiver to cancel the already solved Call out the data, then enter the same iterative process next time, after a predetermined number of iterative processes, the data sent from the third soft output combiner and the fourth soft output combiner are combined by the data collector to restore the source of emission data. 9、根据权利要求8所述的接收系统，其特征在于，所述串行干扰对消迭代接收机还包括一QAM调制器、一扩频器、一第四减法器和一解扩器，其中该第三交织器和第四交织器交织后的数据经扩频器扩频和QAM调制器调制后形成上次迭代数据，空中接收到的正交幅度调制信号先通过该第四减法器减去上次迭代数据，抵消干扰后再送检测器检测，然后由解扩器对检测器输出的数据进行解扩，将码片级的数据处理为比特级的数据后再输出。9. The receiving system according to claim 8, wherein said serial interference cancellation iterative receiver further comprises a QAM modulator, a frequency spreader, a fourth subtractor and a despreader, wherein The data interleaved by the third interleaver and the fourth interleaver are spread by the spreader and modulated by the QAM modulator to form the last iteration data, and the quadrature amplitude modulation signal received in the air is first subtracted by the fourth subtractor The last iterative data is sent to the detector for detection after canceling the interference, and then the data output by the detector is despread by the despreader, and the chip-level data is processed into bit-level data before output. 10、根据权利要求7所述的接收系统，其特征在于，所述检测器可以是均衡器、匹配滤波器或者是RAKE检测器。10. The receiving system according to claim 7, wherein the detector can be an equalizer, a matched filter or a RAKE detector. 11、一种编码调制解调系统，其包括一发射系统和一接收系统，其特征在于：11. A coded modulation and demodulation system, which includes a transmitting system and a receiving system, characterized in that: 所述发射系统，包括一数据分离器、一第一编码器、一第二编码器、一第一交织器、一第二交织器、一异或器、一第一QPSK调制器、一第二QPSK调制器、一第一乘法器和一加法器；The transmission system includes a data separator, a first encoder, a second encoder, a first interleaver, a second interleaver, an exclusive OR, a first QPSK modulator, a second QPSK modulator, a first multiplier and an adder; 其中，原始信号源进入所述数据分离器，被转化为两路数据分别送至第一编码器和第二编码器进行处理；Wherein, the original signal source enters the data separator, is converted into two channels of data, and is sent to the first encoder and the second encoder for processing; 数据分离器处理后的数据送到第一编码器和第二编码器，在第一编码器和第二编码器分别进行信道纠错编码；The data processed by the data separator is sent to the first encoder and the second encoder, and channel error correction encoding is performed on the first encoder and the second encoder respectively; 经过信道纠错编码的数据分别从第一编码器和第二编码器送出，进入第一交织器和第二交织器做交织处理，第一交织器对数据进行交织处理，处理过的数据直接进入第一QPSK调制器进行QPSK调制；由第二交织器交织处理后的数据和第一交织器送出的数据一起送入异或器进行异或处理后再送入第二QPSK调制器做QPSK调制；The data encoded by the channel error correction is sent from the first encoder and the second encoder respectively, and enters the first interleaver and the second interleaver for interleaving processing. The first interleaver performs interleaving processing on the data, and the processed data directly enters the The first QPSK modulator performs QPSK modulation; the data after the interleaving process by the second interleaver and the data sent by the first interleaver are sent to the exclusive OR device for exclusive OR processing and then sent to the second QPSK modulator for QPSK modulation; 由第一QPSK调制器送出的数据送入第一乘法器，乘以增益，得到第一数据流，由第二QPSK调制器送出的数据为第二数据流，第一数据流和第二数据流进入加法器进行复数相加，加法器输出两路分层编码后合并的数据，形成一路合成的正交幅度调制信号；The data sent by the first QPSK modulator is sent to the first multiplier, multiplied by the gain to obtain the first data stream, and the data sent by the second QPSK modulator is the second data stream, the first data stream and the second data stream Enter the adder for complex addition, and the adder outputs the combined data after two layers of coding to form a synthesized quadrature amplitude modulation signal; 该路合成的正交幅度调制信号经一串并变换器变换为多路数据源后经发射单元组从天线发射出去；The synthesized quadrature amplitude modulation signal is transformed into multiple data sources by a series-to-parallel converter, and then transmitted from the antenna through the transmitting unit group; 所述接收系统又包括一串行干扰对消迭代接收机、一第一解交织器、一第二解交织器、一第一译码器、一第二译码器和一数据收集器：The receiving system further includes a serial interference cancellation iterative receiver, a first deinterleaver, a second deinterleaver, a first decoder, a second decoder and a data collector: 其中，串行干扰对消迭代接收机接收空中的标准正交幅度调制信号，进行串行干扰对消迭代接收处理，形成两路接收QPSK解调后的软比特数据；Among them, the serial interference cancellation iterative receiver receives the standard quadrature amplitude modulation signal in the air, performs serial interference cancellation iterative reception processing, and forms two channels to receive soft bit data after QPSK demodulation; 第一路软比特数据送第一解交织器解交织，解交织后数据送第一译码器进行译码，译码完毕数据送数据收集器；The first path of soft bit data is sent to the first deinterleaver for deinterleaving, the deinterleaved data is sent to the first decoder for decoding, and the decoded data is sent to the data collector; 第二路软比特数据送第二解交织器解交织，解交织后数据送第二译码器进行译码，译码完毕数据送数据收集器；The second soft bit data is sent to the second de-interleaver for de-interleaving, the de-interleaved data is sent to the second decoder for decoding, and the decoded data is sent to the data collector; 数据收集器收集第一译码器和第二译码器各自的译码数据，进行数据复用，完成正交幅度调制解调和译码的整个接收过程。The data collector collects the respective decoding data of the first decoder and the second decoder, performs data multiplexing, and completes the entire receiving process of quadrature amplitude modulation, demodulation and decoding. 12、根据权利要求11所述的编码调制解调系统，其特征在于，所述发射系统的第一编码器的编码率等于或大于所述第二编码器的编码率。12. The coded modulation and demodulation system according to claim 11, wherein the coding rate of the first coder of the transmitting system is equal to or greater than the coding rate of the second coder. 13、根据权利要求12所述的编码调制解调系统，其特征在于，所述发射系统的数据分离器的数据分离比例与所述第一编码器和第二编码器的编码率相匹配。13. The coded modulation and demodulation system according to claim 12, characterized in that the data separation ratio of the data separator of the transmitting system matches the coding rates of the first encoder and the second encoder. 14、根据权利要求11所述的编码调制解调系统，其特征在于，所述接收系统的串行干扰对消迭代接收机包括一检测器、一第一QPSK解调器、一第一硬判决器、一第一减法器、一第二QPSK解调器、一第一符号重整器、一第二减法器、一第三QPSK解调器、一第二硬判决器、一第三减法器、一第四QPSK解调器和一第二符号重整器：14. The coded modulation and demodulation system according to claim 11, wherein the serial interference cancellation iterative receiver of the receiving system comprises a detector, a first QPSK demodulator, a first hard decision Device, a first subtractor, a second QPSK demodulator, a first symbol reformer, a second subtractor, a third QPSK demodulator, a second hard decision device, a third subtractor , a fourth QPSK demodulator and a second symbol reformer: 检测器对空中接收到的正交幅度调制信号进行检测，用来消除码间串扰；The detector detects the quadrature amplitude modulation signal received in the air to eliminate intersymbol interference; 检测器输出的数据送入第一QPSK解调器进行QPSK解调，输出软解调数据，软解调数据进入第一硬判决器后获得硬判决结果与检测器输出的数据一起送入第一减法器，检测器输出的数据减去硬判决结果输出第一减法器；The data output by the detector is sent to the first QPSK demodulator for QPSK demodulation, and the soft demodulated data is output. After the soft demodulated data enters the first hard decision device, the hard decision result is obtained and sent to the first hard decision device together with the data output by the detector. A subtractor, the data output by the detector subtracts the hard decision result and outputs the first subtractor; 第一减法器输出结果送第二QPSK解调器进行QPSK解调，获得软解调数据，并进入第一符号重整器进行符号重整；The output result of the first subtractor is sent to the second QPSK demodulator for QPSK demodulation to obtain soft demodulated data, and enter the first symbol reformer for symbol reformation; 检测器输出的数据和第一符号重整器输出的软数据都送入第二减法器，检测器输出的数据减去第一符号重整器输出的软数据，结果输出第二减法器；The data output by the detector and the soft data output by the first symbol reformer are all sent to the second subtractor, the data output by the detector subtracts the soft data output by the first symbol reformer, and the result is output to the second subtractor; 第二减法器输出结果送第三QPSK解调器，进行QPSK解调，输出软解调数据，软解调数据进入第二硬判决器后获得硬判决结果与检测器输出的数据一起送入第三减法器，检测器输出的数据减去第二硬判决器的结果输出第三减法器；The output result of the second subtractor is sent to the third QPSK demodulator to carry out QPSK demodulation and output soft demodulation data. After the soft demodulation data enters the second hard decision device, the hard decision result is obtained and sent to the second hard decision device together with the data output by the detector. Three subtractors, the data output by the detector subtracts the result of the second hard decision unit and outputs the third subtractor; 第三减法器输出结果送第四QPSK解调器进行QPSK解调，获得软解调数据，并进入第二符号重整器进行符号重整；The output result of the third subtractor is sent to the fourth QPSK demodulator for QPSK demodulation to obtain soft demodulated data, and enter the second symbol reformer for symbol reformation; 第三QPSK解调器输出的数据形成第一路软比特数据；The data output by the third QPSK demodulator forms the first soft bit data; 第二符号重整器输出的数据形成第二路软比特数据。The data output by the second symbol reformer forms a second path of soft bit data. 15、根据权利要求14所述的编码调制解调系统，其特征在于，所述接收系统还包括一第一软输出合并器、一第二软输出合并器、一第三软输出合并器、一第四软输出合并器、一第三交织器和一第四交织器，15. The coded modulation and demodulation system according to claim 14, wherein the receiving system further comprises a first soft output combiner, a second soft output combiner, a third soft output combiner, a a fourth soft output combiner, a third interleaver and a fourth interleaver, 其中，由串行干扰对消迭代接收机送出的两路软比特数据分别先进入第一软输出合并器、第二软输出合并器与上次迭代的软输出信号进行合并，两路合并数据分别通过第一解交织器、第二解交织器解交织后送入第一译码器和第二译码器进行译码，译码后的软数据分别进入第三软输出合并器和第四软输出合并器与上次迭代的软输出信号进行合并，合并后的数据通过第三交织器和第四交织器重新交织、扩频和调制返回串行干扰对消迭代接收机，对消掉已经解调出的数据，然后进入下一次同样的迭代过程，经过一预定次数的迭代过程，从第三软输出合并器和第四软输出合并器送出的数据经数据收集器合并后还原出发射的源数据。Among them, the two paths of soft bit data sent by the serial interference cancellation iterative receiver respectively enter the first soft output combiner, the second soft output combiner and the soft output signal of the last iteration to be combined, and the two paths of combined data are respectively After being deinterleaved by the first deinterleaver and the second deinterleaver, it is sent to the first decoder and the second decoder for decoding, and the decoded soft data enters the third soft output combiner and the fourth soft output combiner respectively. The output combiner is combined with the soft output signal of the last iteration, and the combined data is re-interleaved, spread and modulated by the third interleaver and the fourth interleaver, and returned to the serial interference cancellation iterative receiver to cancel the already solved Call out the data, then enter the same iterative process next time, after a predetermined number of iterative processes, the data sent from the third soft output combiner and the fourth soft output combiner are combined by the data collector to restore the source of emission data. 16、根据权利要求15所述的编码调制解调系统，其特征在于，所述接收系统的串行干扰对消迭代接收机还包括一QAM调制器、一扩频器、一第四减法器和一解扩器，其中该第三交织器和第四交织器交织后的数据经扩频器扩频和QAM调制器调制后形成上次迭代数据，空中接收到的正交幅度调制信号先通过该第四减法器减去上次迭代数据，抵消干扰后再送检测器检测，然后由解扩器对检测器输出的数据进行解扩，将码片级的数据处理为比特级的数据后再输出。16. The coded modulation and demodulation system according to claim 15, wherein the serial interference cancellation iterative receiver of the receiving system further comprises a QAM modulator, a frequency spreader, a fourth subtractor and A despreader, wherein the data interleaved by the third interleaver and the fourth interleaver are spread by the spreader and modulated by the QAM modulator to form the last iteration data, and the quadrature amplitude modulation signal received in the air first passes through the The fourth subtractor subtracts the data of the last iteration, cancels the interference, and then sends it to the detector for detection. Then the despreader despreads the data output by the detector, and processes the chip-level data into bit-level data before outputting. 17、一种信号的发射和接收方法，其特征在于，包括以下步骤：17. A signal transmitting and receiving method, comprising the following steps: 步骤一，原始信源被转化为两路数据；Step 1, the original source is converted into two channels of data; 步骤二，两路数据分别进行信道编码；Step 2, channel encoding is performed on the two channels of data respectively; 步骤三，编码后数据分别进行交织处理；Step 3, the encoded data are respectively interleaved; 步骤四，交织处理后的两路数据进行异或处理形成新的第二路数据，第一路数据无变化；Step 4, performing XOR processing on the interleaved two-way data to form a new second-way data, and the first-way data remains unchanged; 步骤五，第一路数据和第二路数据分别进行QPSK调制；Step 5, performing QPSK modulation on the first channel data and the second channel data respectively; 步骤六，第一路调制数据乘2；Step 6: Multiply the modulation data of the first channel by 2; 步骤七，两路调制数据进行复数相加形成一路合成的正交幅度调制信号后发射；Step 7: Carry out complex addition of two channels of modulated data to form one channel of synthesized quadrature amplitude modulation signal before transmitting; 步骤八，合成的正交幅度调制信号被使用串行干扰对消迭代的方法接收，形成两路接收解调后软比特数据；Step 8, the synthesized quadrature amplitude modulation signal is received by using the serial interference cancellation iterative method to form two channels of received demodulated soft bit data; 步骤九，两路接收解调后软比特数据分别被解交织和译码；Step 9, the soft bit data after receiving and demodulating in two channels are respectively deinterleaved and decoded; 步骤十，两路译码后数据被复用成正确还原的接收信号。In step ten, the two decoded data are multiplexed into correctly restored received signals. 18、根据权利要求17所述的信号的发射和接收方法，其特征在于，步骤一中，形成两路数据的两个出口速率可以按照1∶1的关系平均分离，也可以按照不平均关系分离出口速率，第一出口的数据速率大于等于到第二出口的数据速率。18. The signal transmitting and receiving method according to claim 17, characterized in that in step 1, the two exit rates forming the two channels of data can be separated on average according to the relationship of 1:1, or can be separated according to the relationship of unevenness Egress rate, the data rate of the first egress is greater than or equal to the data rate of the second egress. 19、根据权利要求18所述的信号的发射和接收方法，其特征在于，所述步骤八进一步包括以下步骤：19. The signal transmitting and receiving method according to claim 18, characterized in that the eighth step further comprises the following steps: 步骤8a，空中信号被检测器接收和解调，用来消除码间串扰；Step 8a, the air signal is received and demodulated by the detector to eliminate intersymbol interference; 步骤8b，检测器输出的数据送入第一QPSK解调器进行QPSK解调，输出软解调数据；Step 8b, the data output by the detector is sent to the first QPSK demodulator for QPSK demodulation, and the soft demodulation data is output; 步骤8c，软解调数据进入第一硬判决器后获得硬判决结果与检测器输出的数据一起送入第一减法器，检测器输出的数据减去硬判决结果输出第一减法器；Step 8c, after the soft-demodulated data enters the first hard decision device, the hard decision result is obtained and sent to the first subtractor together with the data output by the detector, and the data output by the detector minus the hard decision result is output to the first subtractor; 步骤8d，第一减法器输出结果送第二QPSK解调器进行QPSK解调，获得软解调数据，并进入第一符号重整器进行符号重整；Step 8d, the output result of the first subtractor is sent to the second QPSK demodulator for QPSK demodulation to obtain soft demodulated data, and enter the first symbol reformer for symbol reformation; 步骤8e，检测器输出的数据和第一符号重整器输出的软数据都送入第二减法器，检测器输出的数据减去第一符号重整器输出的软数据，结果输出第二减法器；Step 8e, the data output by the detector and the soft data output by the first symbol reformer are sent to the second subtractor, the data output by the detector subtracts the soft data output by the first symbol reformer, and the result is output by the second subtraction device; 步骤8f，第二减法器输出结果送第三QPSK解调器，进行QPSK解调，输出软解调数据，第三QPSK解调器输出的数据形成第一路软比特数据；同时，软解调数据进入第二硬判决器后获得硬判决结果与检测器输出的数据一起送入第三减法器，检测器输出的数据减去第二硬判决器的结果输出第三减法器；Step 8f, the output result of the second subtractor is sent to the third QPSK demodulator to perform QPSK demodulation and output soft demodulation data, and the data output by the third QPSK demodulator forms the first soft bit data; meanwhile, soft demodulation After the data enters the second hard decision device, the hard decision result is sent to the third subtractor together with the data output by the detector, and the data output by the detector minus the result of the second hard decision device is output to the third subtractor; 步骤8g，第三减法器输出结果送第四QPSK解调器进行QPSK解调，获得软解调数据，并进入第二符号重整器进行符号重整，第二符号重整器输出的数据形成第二路软比特数据。Step 8g, the output result of the third subtractor is sent to the fourth QPSK demodulator for QPSK demodulation to obtain soft demodulated data, and enter the second symbol reformer for symbol reformation, and the data output by the second symbol reformer forms The second soft bit data. 20、根据权利要求19所述的信号的发射和接收方法，其特征在于，在步骤8d/8g中，符号重整的原则与第一QPSK解调器/第三QPSK解调器的解调符号的象限有关，假如第二QPSK解调器/第四QPSK解调器送出软比特数据X+Yj，那么正负符号重整的过程如下所示：20. The signal transmitting and receiving method according to claim 19, characterized in that, in step 8d/8g, the principle of symbol rearrangement is the same as the demodulation symbol of the first QPSK demodulator/third QPSK demodulator If the second QPSK demodulator/fourth QPSK demodulator sends soft bit data X+Yj, then the process of sign rearrangement is as follows: 若第一QPSK解调器/第三QPSK解调器符号的象限为第一象限，则第一符号重整器/第二符号重整器输出的数据对应的软比特为X+Yj；If the quadrant of the first QPSK demodulator/third QPSK demodulator symbol is the first quadrant, then the soft bit corresponding to the data output by the first symbol reformer/second symbol reformer is X+Yj; 若第一QPSK解调器/第三QPSK解调器符号的象限为第二象限，则第一符号重整器/第二符号重整器输出的数据对应的软比特为-X+Yj；If the quadrant of the first QPSK demodulator/third QPSK demodulator symbol is the second quadrant, the soft bit corresponding to the data output by the first symbol reformer/second symbol reformer is -X+Yj; 若第一QPSK解调器/第三QPSK解调器符号的象限为第三象限，则第一符号重整器/第二符号重整器输出的数据对应的软比特为-X-Yj；If the quadrant of the first QPSK demodulator/third QPSK demodulator symbol is the third quadrant, the soft bits corresponding to the data output by the first symbol reformer/second symbol reformer are -X-Yj; 若第一QPSK解调器/第三QPSK解调器符号的象限为第四象限，则第一符号重整器/第二符号重整器输出的数据对应的软比特为X-Yj。If the symbol quadrant of the first QPSK demodulator/third QPSK demodulator is the fourth quadrant, the soft bits corresponding to the data output by the first symbol reformer/second symbol reformer are X-Yj. 21、根据权利要求20所述的信号的发射和接收方法，其特征在于，在步骤九、十中，所述第一路软比特数据和第二路软比特数据先分别进入第一软输出合并器和第二软输出合并器与上次迭代的软输出信号进行合并后再分别被解交织和译码，译码后软数据分别进入第三软输出合并器和第四软输出合并器与上次迭代的软输出信号进行合并，合并后的数据分别经重新交织扩频和调制后返回，进行串行干扰对消迭代，经一预定次数的迭代后再将译码后的输出结果复用成正确还原的接收信号。21. The signal transmitting and receiving method according to claim 20, characterized in that, in steps 9 and 10, the first path of soft bit data and the second path of soft bit data enter the first soft output merge The soft output combiner and the second soft output combiner are combined with the soft output signal of the previous iteration and then deinterleaved and decoded respectively. After decoding, the soft data enters the third soft output combiner and the fourth soft output combiner and the above The soft output signals of the second iteration are combined, and the combined data are returned after re-interleaving, spreading and modulation respectively, and serial interference cancellation iterations are performed, and after a predetermined number of iterations, the decoded output results are multiplexed into Correctly restored received signal. 22、根据权利要求21所述的信号的发射和接收方法，其特征在于，该迭代的次数为2～8次。22. The signal transmitting and receiving method according to claim 21, characterized in that the number of iterations is 2-8.
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