CN101764667B - Wireless transmission device, method and wireless communication system - Google Patents

Abstract

A wireless transmission apparatus, a wireless transmission method, and a wireless reception apparatus, a wireless reception method. The wireless transmission device includes: a reference vector generator that generates, for an information vector to be transmitted, a reference vector having a predetermined hamming distance from the information vector; an encoder which encodes an information vector and a reference vector; a plurality of interleavers each having a different interleaving pattern and applying their interleaving patterns to the encoded information vector and the reference vector, respectively; a modulator that modulates the information vector and the reference vector from each interleaver; an effective value calculator that estimates an information vector and a reference vector transmitted by a channel from the modulation information vector and the modulation reference vector from each interleaver, and calculates a minimum euclidean distance between the information vector and the reference vector transmitted by the channel as an effective value of the interleaver; and an interleaver selector that selects an interleaver having a significant value at least greater than that of another interleaver, so that the modulated information vector from the selected interleaver is transmitted.

Description

Wireless transmission device, method and wireless communication system

technical field

The present invention relates to the wireless transmission and wireless reception technology of the wireless communication system, in particular to the wireless transmission equipment, the wireless transmission method, the wireless reception equipment and the wireless reception method in the wireless communication system.

Background technique

Wireless communication systems have been rapidly developed and popularized in recent years. The combination of coding and modulation is widely used in wireless communication systems. For example, through simple concatenated forward error correction codes and high-order modulation techniques, wireless communication systems can improve system spectrum utilization efficiency while ensuring good bit error rate (BER) performance with low complexity.

Since FEC codes are basically designed for channel burst errors, the sending end increases redundant bits by introducing correlation between codewords. The receiving end uses the corresponding decoding algorithm to use the correlation of the codeword and redundant bits to increase the check of the information bits, thereby greatly improving the anti-interference ability of the information bits. However, for mobile fading channels, errors are often generated randomly, and the occurrence of continuous errors is unavoidable. In order to cope with this situation, an interleaver is widely used to achieve the purpose of dispersing continuous errors, thereby improving the bit error rate performance of the system.

People propose various improvements to the wireless transmission and wireless reception technologies in the wireless communication system, so as to further improve the bit error rate performance of the system.

Contents of the invention

The invention relates to an improved wireless sending device, a wireless sending method, a wireless receiving device and a wireless receiving method, so as to further improve the bit error rate performance of the system.

In one embodiment of the present invention, a wireless communication system includes a wireless sending device and a wireless receiving device. The wireless transmitting device includes: a reference vector generator configured to generate a reference vector having a predetermined Hamming distance from the information vector for the information vector to be transmitted; an encoder configured to encode the information vector and the reference vector; a plurality of interleaving an interleaver each having a different interleaving pattern and configured to apply its interleaving pattern to the coded information vectors and reference vectors, respectively; a modulator configured to modulate the information vectors and reference vectors from each interleaver; an effective value calculator configured to estimate the channel-transmitted information vector and the reference vector based on the modulation information vector and the modulation reference vector from each interleaver, and calculate a minimum Euclidean distance between the channel-transmitted information vector and the reference vector as an effective value of the interleaver; and an interleaver selector configured to select an interleaver having an effective value at least greater than an effective value of another interleaver such that a modulated information vector from the selected interleaver is transmitted. The wireless receiving device includes: a plurality of deinterleavers, each deinterleaver having a different deinterleaving pattern and configured to apply its deinterleaving pattern to the demodulated received information vector; and a deinterleaver selector configured to One of the deinterleavers is selected according to the decoding performance of the output, so that the output of the selected deinterleaver is used for reception processing.

In one embodiment of the present invention, the wireless transmission device includes a reference vector generator, an encoder, a plurality of interleavers, a modulator, an effective value calculator and an interleaver selector. The reference vector generator generates, with respect to the information vector to be transmitted, a reference vector having a predetermined Hamming distance from the information vector. The encoder encodes information vectors and reference vectors. Each interleaver has a different interleaving pattern, and applies its interleaving pattern to the coded information vectors and reference vectors, respectively. The modulator modulates the information vector and reference vector from each interleaver. The effective value calculator estimates the information vector and the reference vector transmitted by the channel according to the modulated information vector and the modulated reference vector from each interleaver, and calculates the minimum Euclidean distance between the information vector transmitted by the channel and the reference vector as the interleaver valid value for . The interleaver selector selects an interleaver whose effective value is at least greater than that of another interleaver, so that the modulation information vector from the selected interleaver is transmitted.

In one embodiment of the present invention, a wireless sending method is provided. According to this wireless transmission method, a reference vector having a predetermined Hamming distance from the information vector is generated for the information vector to be transmitted. Encodes the information vector and reference vector. Multiple different interleaving patterns are applied to the coded information vectors and reference vectors, respectively. Modulation is applied to the information vectors and reference vectors of different interleaving patterns. Estimate the information vector and reference vector transmitted by the channel according to the modulation information vector and modulation reference vector associated with each interleaving mode, and calculate the minimum Euclidean distance between the information vector and the reference vector transmitted by the channel as the effective value of the interleaving mode . An interleaving mode having an effective value at least greater than that of another interleaving mode is selected, and a modulation information vector to which the selected interleaving mode is applied is transmitted.

In one embodiment of the present invention, a wireless receiving device includes a plurality of deinterleavers and a deinterleaver selector. Each deinterleaver has a different deinterleaving pattern and applies its deinterleaving pattern to the demodulated received information vector. The deinterleaver selector selects one of the deinterleavers according to the decoding performance of the output so that the output of the selected deinterleaver is used for reception processing.

In one embodiment of the present invention, a wireless receiving method is provided. According to the wireless reception method, a plurality of different deinterleaving patterns are provided so as to apply the deinterleaving patterns to demodulated reception information vectors. One of the deinterleaving modes is selected in accordance with the decoding performance of the received information vector to which the learned interleaving mode is applied, so that the received information vector to which the selected deinterleaving mode is applied is used for reception processing.

In the embodiment of the present invention, since an appropriate interleaving mode and a corresponding deinterleaving mode are adaptively adopted, the bit error rate of the system can be further improved.

Description of drawings

The above and other objects, features and advantages of the present invention will be more easily understood with reference to the following description of the embodiments of the present invention in conjunction with the accompanying drawings. In the drawings, the same or corresponding technical features or components will be indicated by the same or corresponding reference numerals.

1 is a block diagram showing the structure of a wireless sending device and a wireless receiving device according to an embodiment of the present invention;

FIG. 2 is a flow chart illustrating the processing of a wireless transmission method according to an embodiment of the present invention;

FIG. 3 is a flowchart showing the processing of a wireless receiving method according to one embodiment of the present invention;

FIG. 4 is a flowchart illustrating an example of a wireless receiving method according to an embodiment of the present invention;

FIG. 5 is a flowchart illustrating another example of a wireless receiving method according to an embodiment of the present invention;

FIG. 6 is a block diagram showing the structure of a wireless receiving device according to another embodiment of the present invention.

7 is a flow chart showing the processing of a wireless receiving method according to another embodiment of the present invention;

Fig. 8 is a graph showing the bit error rate of the system according to an embodiment of the present invention;

Fig. 9 is a block diagram showing the general structure of a wireless transmitting device and a wireless receiving device in the prior art;

Fig. 10 is a graph showing the bit error rate of the prior art system.

Detailed ways

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that representation and description of components and processes that are not related to the present invention and known to those of ordinary skill in the art are omitted from the drawings and descriptions for the purpose of clarity.

Before describing the embodiments of the present invention, it will be helpful to understand the embodiments of the present invention by describing the general structures of the wireless sending device and the wireless receiving device in the wireless communication system.

FIG. 9 is a block diagram showing a general configuration of a wireless transmission device 901 and a wireless reception device 902. As shown in FIG.

As shown in FIG. 9 , the wireless transmission device 901 includes an encoder 911 , an interleaver 912 , a modulator 913 and a transmitter 914 .

The encoder 911 performs error detection and/or error correction encoding on the information vector to be transmitted. Coding schemes include but are not limited to simple concatenated forward error correction codes, or near-limit coding techniques proposed in recent years, such as Turbo codes, low-density parity-check (LDPC) codes, etc. Interleaver 912 applies an interleaving pattern to the encoded information vectors for the purpose of spreading out consecutive errors. Modulator 913 applies a modulation scheme to the interleaved information vectors to obtain modulated information vectors, ie data symbol vectors. Modulation schemes include, but are not limited to, 16-symbol quadrature amplitude modulation (16QAM), 64-symbol quadrature amplitude modulation (64QAM), quadrature phase shift keying (QPSK), and the like. The transmitter 914 sends the modulation information vector through the physical channel 903 in the form of a radio frequency signal.

The wireless receiving device 902 receives radio frequency signals transmitted through the physical channel 903 . As shown in FIG. 9 , the wireless receiving device 902 includes a decoder 921 , a deinterleaver 922 , a demodulator 923 , a receiver 924 and a channel estimator 925 .

Receiver 924 receives the radio frequency signal and recovers the modulation information vector therefrom. The demodulator 923 applies a demodulation scheme corresponding to the modulation scheme of the modulator 913 to the recovered modulation information vector to obtain a demodulated information vector. Deinterleaver 922 applies a deinterleaving pattern corresponding to the interleaving pattern of interleaver 912 to the demodulated information vectors to recover the information vectors in normal order. The decoder 921 applies a decoding scheme corresponding to the encoding scheme of the encoder 911 to the recovered information vector to recover the final information vector. The channel estimator 925 may estimate channel parameters in response to a request from the wireless transmission device 901 and return the estimated channel parameters to the wireless transmission device 901 .

For the bit error rate performance of the system, a single interleaver cannot adapt to all channel conditions, so that under some channel conditions, the BER performance can drop by as much as 1dB or more. 10 is a graph showing the system bit error rate in a WiMAX (IEEE802.16e) mobile communication system based on Orthogonal Frequency Division Multiplexing (OFDM) technology, where the curve "16QAM12 WiMAX" represents a 16QAM modulation scheme, 1/ The performance obtained by applying the interleaver of the prior art in the case of 2 code rate coding, the curve "16QAM12w/o Inter" represents the performance obtained by using the 16QAM modulation scheme and 1/2 code rate code without applying the interleaver, the curve "64QAM12 WiMAX" indicates the performance obtained by applying the existing technology interleaver in the case of 64QAM modulation scheme and 1/2 code rate encoding, and the curve "64QAM12w/o Inter" indicates the situation of 64QAM modulation scheme and 1/2 code rate encoding Below is the performance obtained without applying the interleaver. It can be seen from Figure 10 that the performances represented by the curves "16QAM12w/oInter" and "64QAM12w/o Inter" are better than those represented by the curves "16QAM12WiMAX" and "64QAM12WiMAX", respectively. Since the BER performance of the system is a key indicator to measure the reliability of the system, the decrease of the performance will cause the loss of the system capacity.

The inventors proposed the following ideas. The coding, modulation and other links of the wireless transmission equipment can be regarded as a generalized coding. That is, any mapping from an information vector u to a transmitted time vector s is a generalized encoding. Suppose U is the set of all possible information vectors u, R is the set of transmitted modulation vectors s, and C is the set of all possible channels g. Let the set F denote the set of all possible mappings from U to R.

For an information vector u to be sent, given a generalized encoding f ∈ F, a channel g ∈ C, and a coding scheme, the error rate is deterministic, expressed as P _e (u; f; g) . Without considering the complexity, the best practice for the wireless transmitting device is to choose f ^* such that f ^* =argmin _f {P _e (u; f; g)}.

To reduce the complexity of searching the optimal f ^* in the whole set F, a convenient way is to use different interleavers between encoding and modulation. Different interleavers will map the same u to different s, thus corresponding to different generalized codes. This narrows down the options.

In order to solve the problem of how to minimize the error rate, the minimum Euclidean distance can be used to judge the performance, so that it is not necessary to obtain the error rate of the generalized coding through simulation or measurement every time of selection. This greatly simplifies the problem.

Based on this consideration, different interleavers can be used to form a generalized coding set F. A set U' is formed with a reference vector u' having a predetermined Hamming distance (for example, 1) from the information vector u.

For each f∈F, estimate the information vector u and each reference vector u′∈U′ corresponding to the information vector s and reference vector s′ transmitted on the channel, and find the relationship between the information vector s transmitted by the channel and the reference vector s′ The Euclidean distance between them, and take the smallest Euclidean distance as the effective value of this f. The generalized coding f ^* of the interleaver with the largest effective value is selected as the current optimal generalized coding method.

FIG. 1 is a block diagram showing the structures of a wireless transmitting device 101 and a wireless receiving device 102 according to one embodiment of the present invention.

As shown in FIG. 1 , a wireless transmission device 101 includes an encoder 111, a plurality of interleavers 112-1 to 112-n, a modulator 113, a reference vector generator 115, an effective value calculator 116, an interleaver selector 117, and a transmitter device 114.

In the wireless transmission device 101 shown in FIG. 1, each interleaver 112-1 to 112-n has a different interleaving pattern (representing a different generalized code f). During communication, channel 103 may experience different channel conditions. A specific interleaving pattern helps to reduce the bit error rate of the system under certain channel conditions, but does not help or hinder the reduction of the bit error rate of the system under other channel conditions. All or at least two channel conditions may be selected from these channel conditions and corresponding interleavers 112-1 to 112-n provided accordingly. That is to say, for each selected channel condition, one of the interleavers 112-1 to 112-n can apply an interleaving pattern that helps reduce the system bit error rate under the channel condition. The channel conditions under which different interleaving modes help to reduce the BER of the system are known in the technical field, so no detailed description will be given here.

For an information vector u={u ₁ , . . . , u _L } to be sent, where L≥1, the reference vector generator 115 generates a set of reference vectors U′. The set of reference vectors U' contains one or more reference vectors u'. For each reference vector u'∈U', there is a predetermined Hamming distance D between u' and u. The predetermined Hamming distance D may be any distance between 1 and L-1, and may be one or more (up to all) such distances.

The encoder 111 encodes the information vector u and each reference vector u'∈U'.

The interleavers 112-1 to 112-n apply their interleaving patterns to the encoded information vector u and each reference vector u', respectively.

Modulator 113 modulates (ie, interleaves) information vector u and each reference vector u' from each interleaver 112-1 to 112-n to generate a corresponding modulated information vector m and modulated reference vector m'.

The effective value calculator 116 estimates the channel-transmitted information vector s and the reference vector s' from the modulation information vector m and the modulation reference vector m' from each interleaver 112-1 to 112-n, and calculates the channel-transmitted information vector s The minimum Euclidean distance to the reference vector s' is used as the effective value of the interleavers 112-1 to 112-n.

The Euclidean distance between the information vector s transmitted by the channel and the reference vector s' can have various specific definitions, as long as it can reflect the measure of the distance between the vectors. Correspondingly, various methods can be used to calculate the minimum Euclidean distance between the information vector s transmitted by the channel and the reference vector s′.

Assume that the information vector u={u ₁ ,..., u _L } is encoded and the encoded information vector is interleaved by each interleaver 112-1 to 112-n and modulated by the modulator 113. Modulated information (complex number) The vector is m={m ₁ , . . . , m _N }. The reference information vector correspondingly generated by the reference vector generator 115 is u′={u ₁ ′, . . . , u _L ′}∈U _MinH . The reference information vector u' is coded and the coded reference vector is interleaved by each interleaver 112-1 to 112-n and modulated by the modulator 113. The modulated reference (complex number) vector is m'={m ₁ ',. . . , m _N ′}∈U′ _MinH . The channel estimation vector fed back by the wireless receiving device is h={h ₁ , . . . , h _N }.

_The effective value calculator 116 can calculate _the information vector s={s ₁ , . ..., s _N ′} ∈ U ^s _MinH The minimum Euclidean distance between them is used as an effective value to characterize the interleaver.

method 1:

For each interleaver 112-1 to 112-n, the effective value calculator 116 uses the modulation information vector m and the modulation reference vector m' from the interleaver as estimated channel transmitted information vector s and reference vector s'.

RMS calculator 116 calculates the Euclidean distance between s and s′ for each s′∈U ^s _MinH :

${\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; E.</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

where || ² represents the square of the complex modulus.

For the interleaver, the effective value calculator 116 selects the smallest Euclidean distance from all the calculated Euclidean distances as an effective value characterizing the interleaver.

Method 2:

For each interleaver 112-1 to 112-n, the rms calculator 116 obtains the estimated channel transmitted information by weighting the modulation information vector m and the modulation reference vector m' from that interleaver, respectively, by the channel estimation vector h Vector s and reference vector s′, where s _i =m _i ··h _i , s _i ′=m _i ′··h _i , 1≤i≤N.

RMS calculator 116 calculates the Euclidean distance between s and s′ for each s′∈U ^s _MinH :

${\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; E.</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

where || ² represents the square of the complex modulus.

For the interleaver, the effective value calculator 116 selects the smallest Euclidean distance from all the calculated Euclidean distances as an effective value characterizing the interleaver.

Method 3:

For each interleaver 112-1 to 112-n, the effective value calculator 116 uses the modulation information vector m and modulation reference vector m' from the interleaver as estimated channel-transmitted information vector s and reference vector s'.

The effective value calculator 116 maps the estimated information vector s and reference vector s' transmitted by the channel into a real number information vector d and a real number reference vector d'. Assuming that the modulator 113 adopts q-order modulation, there are 2 ^q modulation constellation points in total. The estimated information vector s transmitted by the channel and each complex number element s _i or s _i ′ of the reference vector s′ can be mapped to constellation points through the mapping relationship group g ₁ , g ₂ ,..., g _q is mapped to real number information vector element d _i =x ₁ x ₂ ... x _q , x _j =g _j (s _i ), j=1,...,q and real number reference vector element x _i ′=x ₁ ′x ₂ ′...x _q ′, x _j ′=g _j (s _i ′), j=1,...,q, so as to obtain the real number information vector d={d ₁ ,...,d _N } and a real number reference vector d′={d ₁ ′, . . . , d _N ′}∈U ^d _MinH .

The effective value calculator 116 calculates the Euclidean distance between d and d' for each d'∈U ^d _MinH as the estimated Euclidean distance between the information vector s transmitted by the channel and the reference vector s' distance:

${\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; E.</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

Where || represents the absolute value of a real number.

For the interleaver, the effective value calculator 116 selects the smallest Euclidean distance from all the calculated Euclidean distances as an effective value characterizing the interleaver.

Method 4:

For each interleaver 112-1 to 112-n, the rms calculator 116 obtains the estimated channel transmitted information by weighting the modulation information vector m and the modulation reference vector m' from that interleaver, respectively, by the channel estimation vector h Vector s and reference vector s′, where s _i =m _i ··h _i , s _i ′=m _i ′··h _i , 1≤i≤N.

The effective value calculator 116 maps the estimated information vector s and reference vector s' transmitted by the channel into a real number information vector d and a real number reference vector d'. Assuming that the modulator 113 adopts q-order modulation, there are 2 ^q modulation constellation points in total. The estimated information vector s transmitted by the channel and each complex number element s _i or s _i ′ of the reference vector s′ can be mapped to constellation points through the mapping relationship group g ₁ , g ₂ ,..., g _q is mapped to real number information vector element d _i =x ₁ x ₂ ... x _q , x _j =g _j (s _i ), j=1,...,q and real number reference vector element x _i ′=x ₁ ′x ₂ ′...x _q ′, x _j ′=g _j (s _i ′), j=1,...,q, so as to obtain the real number information vector d={d ₁ ,...,d _N } and a real number reference vector d′={d ₁ ′, . . . , d _N ′}∈U ^d _MinH .

The effective value calculator 116 calculates the Euclidean distance between d and d' for each d'∈U ^d _MinH as the estimated Euclidean distance between the information vector s transmitted by the channel and the reference vector s' distance:

${\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; E.</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; d</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; |</span>$

Where || represents the absolute value of a real number.

For the interleaver, the effective value calculator 116 selects the smallest Euclidean distance from all the calculated Euclidean distances as an effective value characterizing the interleaver.

Interleaver selector 117 selects an interleaver whose effective value is at least greater than that of another interleaver from among interleavers 112-1 to 112-n, so that transmitter 114 transmits modulation information vector s from the selected interleaver. Preferably, the interleaver selector 117 selects the interleaver with the largest effective value.

In a preferred embodiment, the interleaver selector 117 enables the wireless transmitting device 101 to notify the wireless receiving device of the selection (ie, the selection of the interleaving mode) (for example, through control signaling), so as to select a corresponding deinterleaver for receiving deal with.

FIG. 2 is a flowchart showing the processing of a wireless transmission method according to one embodiment of the present invention.

As shown in FIG. 2 , the method starts at step 200 . In step 202, for an information vector u to be sent, a set of reference vectors U' is generated. The set of reference vectors U _s contains one or more reference vectors u'. For each reference vector u'∈U', there is a predetermined Hamming distance D between u' and u. The predetermined Hamming distance D may be any distance between 1 and L-1, and may be one or more such distances.

In step 204, the information vector u and each reference vector u'∈U' are encoded.

In step 206, a plurality of different interleaving patterns are applied to the encoded information vector u and each reference vector u', respectively.

In step 208, the modulation is applied to the information vector u and each reference vector u' with different interleaving modes to generate the corresponding modulation information vector m and modulation reference vector m'.

In step 210, the information vector s and the reference vector s' transmitted by the channel are estimated according to the modulation information vector m and the modulation reference vector m' related to each interleaving mode.

In step 212, the minimum Euclidean distance between the information vector s transmitted by the channel and the reference vector s' is calculated as the effective value of the interleaving mode. The minimum Euclidean distance between the information vector s transmitted by the channel and the reference vector s' can be calculated by various methods, such as methods 1 to 4 described above.

In step 214, an interleaving pattern whose effective value is at least greater than that of another interleaving pattern is selected from different interleaving patterns. Preferably, the interleaving mode with the largest effective value is selected.

In step 216, the modulation information vector s to which the selected interleaving pattern is applied is transmitted. The method ends at step 218 .

In a preferred embodiment, the selection can be notified to the receiving side (for example, through control signaling), so as to select a corresponding deinterleaving mode for receiving processing.

In the previous embodiments, the selection of an interleaver or interleaving pattern can be performed for each information vector to be transmitted. Optionally, in the interleaver or in the step of selecting an interleaving mode, control may be performed such that reference vector generation is performed for the next information vector to be transmitted at the beginning of a period based on time, the number of transmitted information vectors, or other counts, Coding, application of different interleaving modes, modulation, effective value calculation and processing of selecting an interleaver or interleaving mode, but for other information vectors in a period, only the selected interleaver or interleaving mode is used to process the information vector.

Returning to FIG. 1 , the wireless reception device 102 includes a decoder 121 , a plurality of deinterleavers 122 - 1 to 122 - n , a demodulator 123 , a receiver 124 and a deinterleaver selector 125 . The demodulator 123 and the receiver 124 are respectively the same as the demodulator 923 and the receiver 924 of FIG. 9 .

Each of the deinterleavers 122-1 to 122-n has a different deinterleaving mode, respectively corresponding to the plurality of interleaving modes described above. Each deinterleaver 122-1 to 122-n applies its deinterleaving pattern to the received information vector demodulated by the demodulator 123, thereby generating n deinterleaved information vectors.

The deinterleaver selector 125 selects one of the deinterleavers 122-1 to 122-n according to the output, i.e., the decoding performance of the n deinterleaved information vectors, so that the output of the selected deinterleaver is used for reception processing .

Decoding performance can be determined in various ways for selection. For example, the n deinterleaved information vectors may be respectively decoded by the decoder 121, and the detected bit error rate may be used as the decoding performance. In this case, the deinterleaver selector 125 selects the information vector with the best decoding performance to output according to the decoding performance provided by the decoder 121, or controls to output from the decoder 121 for subsequent reception processing. For another example, the receiver 124 may receive a notification about the interleaving mode corresponding to the information vector through control signaling, and notify the deinterleaver selector 125 of the interleaving mode (as shown by the dotted arrow in FIG. 1 ). The deinterleaver selector 125 uses the output of the deinterleaver having the deinterleaving pattern corresponding to the notified interleaving pattern, that is, the information vector, as the output with the best decoding performance, thereby selecting the information vector output, or controlling to select from Decoder 121 outputs. Fig. 6 also shows another way of selection.

Fig. 6 is a block diagram showing the structure of a wireless receiving device 602 according to another embodiment of the present invention, wherein the corresponding wireless sending device 601 is also shown for convenience of illustration.

As shown in FIG. 6, a wireless transmission device 601 includes an encoder 611, a plurality of interleavers 612-1 to 612-n, a modulator 613, a reference vector generator 615, an effective value calculator 616, an interleaver selector 617, and a transmitter device 614. These parts are the same as the corresponding parts of the wireless transmission device 101 of FIG. 1 in which the selection made by the interleaver selector 617 is notified to the wireless reception device 602 .

The wireless reception device 602 includes a decoder 621 , a plurality of deinterleavers 622 - 1 to 622 - n , a demodulator 623 , a receiver 624 and a deinterleaver selector 625 .

Each de-interleaver 622-1 to 622-n has a different de-interleaving mode, respectively corresponding to the multiple interleaving modes described above.

The receiver 624 receives the signal carrying the information vector sent by the wireless transmitting device 601 via the channel 603, and the notification about the selected interleaving pattern, provides the information vector to the demodulator 613, and provides the notified interleaving pattern to the deinterleaver selector 625 .

For this information vector, the deinterleaver selector 625 regards the output of the deinterleaver having the deinterleaving mode corresponding to the notified interleaving mode, that is, the information vector, as the output with the best decoding performance, and thus the demodulated information The vector is supplied to the deinterleaver or controlled to supply the demodulated information vector from the demodulator 613 to the deinterleaver for deinterleaving processing. The deinterleaver selector 625 supplies the deinterleaved information vector to the decoder 621, or controls to supply the deinterleaved information vector from the deinterleaver to the decoder 621 so as to be decoded by the decoder 621 and output.

FIG. 3 is a flowchart illustrating processing of a wireless receiving method according to one embodiment of the present invention.

As shown in FIG. 3 , the method begins at step 300 . In step 302, a plurality of different deinterleaving patterns are provided, respectively corresponding to the plurality of interleaving patterns described above, so as to apply the deinterleaving patterns to the demodulated received information vector. In step 304, one of the deinterleaving modes is selected according to the decoding performance of the received information vector applying the known interleaving mode, so as to generate a corresponding deinterleaved information vector. In step 306, the received information vector to which the selected de-interleaving pattern is applied is used for the receiving process. The method ends at step 308 .

In step 304, the decoding performance can be determined in various ways for selection. Figures 4, 5 and 7 describe these approaches, respectively.

FIG. 4 is a flowchart illustrating an example of a wireless receiving method according to an embodiment of the present invention.

As shown in FIG. 4 , the method begins at step 400 . In step 402, the received information vector is demodulated. In step 404, a plurality of different deinterleaving patterns are respectively applied to the demodulated received information vector, and these deinterleaving patterns respectively correspond to the plurality of interleaving patterns described above. In step 406, the deinterleaved information vectors are respectively decoded, and the detected bit error rate is used as the decoding performance. In step 408, according to the decoding performance detected through decoding, the information vector with the best decoding performance is selected. In step 410, the received information vector to which the selected de-interleaving mode is applied is output as a final decoded information vector. The method ends at step 412 .

FIG. 5 is a flowchart illustrating another example of a wireless receiving method according to an embodiment of the present invention.

As shown in FIG. 5 , the method begins at step 500 . In step 501, a notification about an interleaving mode corresponding to an information vector is received through control signaling. In step 502, the received information vector is demodulated. In step 504, a plurality of different deinterleaving patterns are respectively applied to the demodulated received information vector, and these deinterleaving patterns respectively correspond to the plurality of interleaving patterns described above. In step 506, the deinterleaved information vectors are respectively decoded. In step 508, a de-interleaving mode corresponding to the notified interleaving mode is selected. In step 510, the received information vector to which the selected de-interleaving mode is applied is output as a final decoded information vector. The method ends at step 512 .

7 is a flow chart showing the processing of a wireless receiving method according to another embodiment of the present invention;

As shown in FIG. 7 , the method begins at step 700 . In step 701, a notification about an interleaving pattern corresponding to an information vector is received through control signaling. In step 702, the received information vector is demodulated. In step 704, a de-interleaving mode corresponding to the notified interleaving mode is selected. In step 706, the demodulated information vectors are subjected to deinterleaver processing using the selected deinterleaving mode. In step 708, the deinterleaved information vector is decoded. At step 710, the decoded information vector is output. The method ends at step 712 .

In the case of selecting and notifying the interleaving mode for each information vector to be transmitted, the deinterleaver selector 625 or the deinterleaving mode selection step may perform selection processing for each received information vector and the corresponding notified interleaving mode. In the case of periodically selecting and notifying the interleaving mode as described above, the deinterleaver selector 625 or the deinterleaving mode selecting step can perform selection processing on information vectors with corresponding notifications, but for other information vectors without corresponding notifications vector, only the selected deinterleaver or deinterleaver mode is used to process the information vector.

8 is a graph showing the system bit error rate in a WiMAX (IEEE802.16e) mobile communication system based on Orthogonal Frequency Division Multiplexing (OFDM) technology, where the curve "16QAM12 WiMAX" represents a 16QAM modulation scheme, 1/ The performance obtained by applying the interleaver of the prior art in the case of 2 code rate coding, the curve "16QAM12w/o Inter" represents the performance obtained by using the 16QAM modulation scheme and 1/2 code rate code without applying the interleaver, the curve "64QAM12 WiMAX" indicates the performance obtained by applying the existing technology interleaver in the case of 64QAM modulation scheme and 1/2 code rate encoding, and the curve "64QAM12w/o Inter" indicates the situation of 64QAM modulation scheme and 1/2 code rate encoding Under the performance obtained by not applying the interleaver, the curve "16QAM12proposed" represents the performance obtained by applying the scheme of the present invention under the situation of 16QAM modulation scheme and 1/2 code rate coding, and the curve "64QAM12proposed" represents the performance of the 64QAM modulation scheme, 1/2 The performance obtained by applying the solution of the present invention in the case of code rate coding. It can be seen from Figure 8 that the curves "16QAM12proposed" and "64QAM12proposed" almost coincide with the curves "16QAM12w/o Inter" and "64QAM12w/o Inter" respectively, showing better performance than the curves "16QAM12 WiMAX" and "64QAM12 WiMAX". performance.

Regardless of the computational load, for an interleaver or interleaving mode, the reference vector set U' should contain all reference vectors u' with all possible predetermined Hamming distances D to the information vector u, in order to obtain the most representative A valid value for sex, which is the minimum Euclidean distance.

Thus, in a preferred embodiment, the set of reference vectors U' comprises all reference vectors u' which have a partially predetermined Hamming distance D from the information vector u. This may make the determined rms more representative.

In another preferred embodiment, the set of reference vectors U' comprises part or all of the reference vectors u' having all possible predetermined Hamming distances D to the information vector u. This may make the determined rms more representative.

In the above preferred embodiment, if the value of D is large, or if the value of D is large, the reference vector set U' has many elements, which makes the calculation of the Euclidean distance more burdensome. Therefore, a D value of 1 can be chosen.

Furthermore, in another preferred embodiment, the set of reference vectors U' includes some or all of the reference information vectors u' having the smallest Hamming distance to the information vector u. For different coding and modulation schemes, there is a minimum Hamming distance specific to the coding and modulation scheme, so that for the information vector u and the reference information vector u′ with this minimum Hamming distance to information vector u, it is transmitted in the channel The Euclidean distance between the information vector s and the reference vector s' is the smallest, smaller or mostly smaller. For example, for non-recursive convolutional codes (such as tail-bit convolutional codes used by WiMAX), the Euclidean distance obtained in this way is often the smallest (if not the smallest, at least smaller). In this way, the calculation load can be reduced while ensuring the representativeness of effective values.

The wireless sending device and the wireless receiving device of the present invention can be applied to base stations and mobile terminals respectively, and can also be applied to peer-to-peer communication devices.

In the foregoing specification, the invention has been described with reference to specific embodiments. However, those of ordinary skill in the art understand that various modifications and changes can be made without departing from the scope of the present invention as defined in the claims.

Claims (13)

1. A wireless transmission device, comprising: A reference vector generator configured to generate a reference vector with a predetermined Hamming distance between the information vector and the information vector to be sent; an encoder configured to encode said information vector and reference vector; a plurality of interleavers each having a different interleaving pattern and configured to apply its interleaving pattern to the encoded information vectors and reference vectors, respectively; a modulator configured to modulate the information vector and the reference vector from each interleaver; an effective value calculator configured to estimate the channel-transmitted information vector and the reference vector based on the modulation information vector and the modulation reference vector from each interleaver, and calculate a minimum Euclidean distance between the channel-transmitted information vector and the reference vector as an effective value for the interleaver; and An interleaver selector configured to select an interleaver whose significance is at least greater than that of another interleaver, such that the modulated information vector from the selected interleaver is transmitted. 2. The wireless transmission device according to claim 1, wherein the effective value calculator is further configured to use the modulation information vector and the modulation reference vector from each interleaver as the estimated channel transmission information vector and reference vector. 3. The wireless transmission device according to claim 1, wherein the effective value calculator is further configured to obtain the information vector and the reference vector transmitted by the channel by weighting the modulation information vector and the modulation reference vector respectively with the channel estimation vector vector. 4. The wireless transmission device according to any one of claims 1 to 3, wherein the interleaver selector is further configured to select an interleaver with the largest effective value. 5. The wireless transmission device according to one of claims 1 to 3, wherein the effective value calculator is further configured to map the information vector and the reference vector transmitted by the channel into a real number information vector and a real number reference vector, and A Euclidean distance between the real information vector and the real reference vector is calculated as the Euclidean distance between the channel transmitted information vector and the reference vector. 6. The wireless transmission device according to any one of claims 1 to 3, wherein the predetermined Hamming distance is a minimum Hamming distance specific to a coded modulation scheme. 7. The wireless transmitting device according to one of claims 1 to 3, wherein the interleaver selector is further configured such that the wireless transmitting device notifies a recipient of the selection. 8. A wireless transmission method, comprising: generating a reference vector having a predetermined Hamming distance from the information vector for the information vector to be sent; encoding said information vector and reference vector; applying a plurality of different interleaving patterns to the encoded information vectors and reference vectors, respectively; modulating said information vector and reference vector to which different interleaving modes are applied; Estimate the information vector and reference vector transmitted by the channel according to the modulation information vector and modulation reference vector associated with each interleaving mode, and calculate the minimum Euclidean distance between the information vector and the reference vector transmitted by the channel as the effective value of the interleaving mode ;and An interleaving mode having an effective value at least greater than that of another interleaving mode is selected, and a modulation information vector to which the selected interleaving mode is applied is transmitted. 9. The wireless transmission method according to claim 8, wherein said estimating comprises: The modulation information vector and the modulation reference vector related to each interleaving mode are used as the information vector and the reference vector of the estimated channel transmission. 10. The wireless transmission method according to claim 8, wherein said estimating comprises: The information vector and the reference vector transmitted by the channel are obtained by weighting the modulation information vector and the modulation reference vector respectively with the channel estimation vector. 11. The wireless transmission method according to one of claims 8 to 10, wherein said calculation comprises: mapping information vectors and reference vectors transmitted by the channel into real information vectors and real reference vectors; and A Euclidean distance between the real information vector and the real reference vector is calculated as the Euclidean distance between the channel transmitted information vector and the reference vector. 12. A wireless communication system, comprising a wireless sending device and a wireless receiving device, wherein the wireless sending device includes: A reference vector generator configured to generate a reference vector with a predetermined Hamming distance between the information vector and the information vector to be sent; an encoder configured to encode said information vector and reference vector; a plurality of interleavers each having a different interleaving pattern and configured to apply its interleaving pattern to the encoded information vectors and reference vectors, respectively; a modulator configured to modulate the information vector and the reference vector from each interleaver; an effective value calculator configured to estimate the channel-transmitted information vector and the reference vector based on the modulation information vector and the modulation reference vector from each interleaver, and calculate a minimum Euclidean distance between the channel-transmitted information vector and the reference vector as an effective value for the interleaver; and an interleaver selector configured to select an interleaver whose significance is at least greater than that of another interleaver, such that a modulated information vector from the selected interleaver is transmitted; and The wireless receiving device includes: a plurality of deinterleavers, each deinterleaver having a different deinterleaving pattern and configured to apply its deinterleaving pattern to the demodulated received information vector; and A deinterleaver selector configured to select one of the deinterleavers according to the decoding performance of the output such that the output of the selected deinterleaver is used for reception processing. 13. The wireless communication system as claimed in claim 12, wherein the deinterleaver selector is further configured to receive a notification indicating an interleaving mode from the wireless transmitting device, and will have an interleaving mode corresponding to the indicated The output of the de-interleaver in the de-interleaving mode is taken as the output with the best decoding performance.

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