CN103763250A - Anti-noise wireless signal transmission method for digital broadcast - Google Patents

Abstract

The invention discloses a digital broadcasting wireless signal anti-noise transmission method, which is a framing modulation scheme in which time domain and frequency domain are mixed. The training sequence optimization design, signal generation mode and signal selection method of the digital broadcast wireless signal anti-noise transmission method of the present invention are easy to process and restore the original signal of the OFDM signal at the receiver end, and have low peak-to-average power ratio, short synchronization time, Anti-channel fading, controllable multi-service and other advantages.

Description

Anti-noise Transmission Method of Digital Broadcasting Wireless Signal

technical field

The invention belongs to the field of wireless communication, and more specifically relates to a method for anti-noise transmission of digital broadcast wireless signals.

Background technique

At present, television broadcasting has gradually developed from analog to digital. Digital TV digital broadcasting wireless transmission system, as an important part of digital TV digital broadcasting wireless, the development of its related technologies is closely related to people's quality of life, and therefore has received extensive attention from people. Digital TV, digital broadcasting and wireless related technologies and related industries are industries with rapid development and good market prospects in the field of communication and computer. In terms of related digital TV and digital broadcasting wireless technologies, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile implementation solutions for digital TV and digital broadcasting wireless in a complex wave propagation environment. Digital broadcast wireless signal anti-noise transmitter framing modulation technology is the key technology of digital TV digital broadcast wireless system, which plays a decisive role in the performance of the whole system, and is the object of everyone's key research.

Due to the rapid development of digital signal processing technology and integrated circuit technology, the system realization of Orthogonal Frequency Division Multiplexing (OFDM) technology becomes easier and easier. Because OFDM multi-carrier transmission technology has many advantages such as simple structure, high spectrum utilization rate, and anti-frequency selectivity and channel time variation, it has attracted much attention and has been deeply researched and applied in Xdsl, broadband mobile communication, broadband wireless local area network, It is widely used in many fields such as digital TV, digital broadcasting and wireless.

The high peak-to-average power ratio (PAPR) of OFDM signals has high requirements on the linear range of amplifiers and digital-to-analog converters. If the linear range of the system cannot meet the signal changes, it will cause signal distortion and signal spectrum changes. , resulting in the destruction of the orthogonality between sub-channels, resulting in mutual interference and deteriorating system performance. Therefore, it is necessary to consider how to reduce the occurrence probability of high peak power signals in OFDM signals and reduce the impact of nonlinear distortion.

In the actual communication environment, the performance of digital TV digital broadcasting wireless communication system is affected by factors such as synchronization time, clock jitter, channel fading, and channel interference. The digital broadcast wireless signal anti-noise transmitter transmission method is the key technology to realize the reliable digital TV digital broadcast wireless.

Using the digital TV digital broadcasting wireless transmission system to provide controllable multi-services such as free TV broadcasting, paid TV broadcasting, confidential information transmission, and digital value-added services is a reflection of the new generation of digital TV digital broadcasting wireless transmission system meeting social needs.

Based on the above background, the present invention proposes a digital broadcast wireless signal anti-noise transmission method for the actual communication environment, which can meet the needs of high data rate controllable multi-service digital TV digital broadcast wireless transmission.

For a more in-depth understanding of the patent background, please refer to the following literature:

R.V.Nee, R.Prasad. "OFDM for wireless multimedia communications".

Boston: Artech House, 2000.

Y. Wu, S. Hirakawa, U.H. Reimers, and J. Whitaker. "Overview of digital television development," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.8-21, Jan.2006. M.S. Richer, G. Reitmeier, T. Gurley, G.A. Jones, J. Whitaker, and R. Rast. "The ATSC digital television system," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.37-43 , Jan. 2006.

U.Ladebusch and C.A.Liss. "Terrestrial DVB (DVB-T): A broadcast technology for stationary portable and mobile use," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.183-194, .2006.

M. Takada and M. Saito. "Transmission systems for ISDB-T," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.251-256, Jan.2006.

Contents of the invention

Aiming at the high data rate controllable multi-service digital TV digital broadcast wireless problem, the invention proposes a digital broadcast wireless signal anti-noise transmission method.

A kind of digital broadcast wireless signal anti-noise transmission method that the present invention proposes is characterized in that it comprises the following steps:

1) Digital radio wireless signal anti-noise transmitter converts the multimedia data stream into a bit stream through the media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form the input data bit stream;

2) The digital broadcast wireless signal anti-noise transmitter encodes its input data bits in the frequency domain through LDPC to form an FFT coded data block. LDPC means low-density parity check. The length of the FFT coded data block is K, and the value of K take an even number;

3) The digital broadcast wireless signal anti-noise transmitter uses IFFT to transform the FFT coded data block into a time-domain discrete coded data sample block D _total =[d ₀ , d ₁ ,..., d _K-2 , d _K-1 ];

4) The digital broadcast wireless signal anti-noise transmitter demultiplexes the time-domain discrete coded data sample blocks and separates them in turn according to the order of each time-domain discrete coded data sample to generate odd sub-blocks of time-domain discrete coded data samples _Dodd =[d ₀ ,d ₂ ,…,d _K-4 ,dK-2] and time-domain discrete coded data sample value even block _Deven =[d ₁ ,d ₃ ,…,d _K-3 ,d _K-1 ];

生成模式3为

生成模式4为

生成模式5为

生成模式6为

生成模式7为D_new=[D^* _奇，D_偶]，生成模式8为

生成模式9为

生成模式10为生成模式11为生成模式12为

生成模式13为D_new=[D_奇，D^* _偶]，生成模式14为

生成模式15为

生成模式16为

生成模式17为

生成模式18为

比较18种生成模式合成的时域离散编码数据样值块D_new，选取其中具有最低峰均功率比的降峰均功率比时域离散编码数据样值块

并将降峰均功率比时域离散编码数据样值块

所对应采用的生成模式信息发送给业务指标序列设置单元，其中，D^* _奇表示对时域离散编码数据样值奇子块D_奇的各时域离散编码数据样值进行共轭运算处理而得到的时域离散编码数据样值子块；D^* _偶表示对时域离散编码数据样值偶子块D_偶的各时域离散编码数据样值进行共轭运算处理而得到的时域离散编码数据样值子块；5) The anti-noise transmitter of the digital broadcasting wireless signal adjusts the signal power of the odd sub-block Dodd of the time-domain discretely coded data samples _{and the even} sub-block D of the time-domain discretely coded data samples through the peak-to-average power ratio adjustment unit and the corresponding signal Process and re-synthesize a new time-domain discretely coded data sample block _Dnew , the new time-domain discretely coded data sample block _Dnew is obtained using the following generation mode, generation mode 1 is _Dnew =[ _Dodd , _Deven ], Generate schema 2 as

Generate schema 3 as

Generate schema 4 as

Generate schema 5 as

Generate schema 6 as

Generation mode 7 is D _new = [D ^* _odd , D _even ], generation mode 8 is

Generate schema 9 as

Generate schema 10 as Generate schema 11 as Generate schema 12 as

Generation mode 13 is D _new = [D _odd , D ^* _even ], generation mode 14 is

Generate schema 15 as

Generate schema 16 as

Generate schema 17 as

Generate schema 18 as

Compare the time-domain discrete-coded data sample block D _new synthesized by 18 generation modes, and select the time-domain discrete-coded data sample block with the lowest peak-to-average power ratio

and reduce the peak-to-average power ratio time-domain discretely coded data sample block

The generated mode information correspondingly adopted is sent to the service indicator sequence setting unit, wherein, D ^* _odd means that the time-domain discrete-coded data samples of the odd sub-block Dodd of _the time-domain discrete-coded data samples are conjugated and processed to obtain The time-domain discretely coded data sample sub-block; D ^* _even represents the time-domain discretely coded data obtained by performing conjugate operation on _each time-domain discretely coded data sample of the time-domain discretely coded data sample even sub-block Deven sample sub-block;

6) The digital broadcast wireless signal anti-noise transmitter inserts the service index sequence behind the training sequence to form a time-domain training sequence discrete sample value block in the time domain. The service index sequence contains and uniquely expresses the digital broadcast wireless signal anti-noise transmitter System parameters and business model information;

7) The digital broadcast wireless signal anti-noise transmitter inserts the cyclic prefix as a guard interval into the time-domain discrete coded data sample block with reduced peak-to-average power ratio to form a discrete-coded data sample block with reduced peak-to-average power ratio time domain cyclic prefix as a frame Body, the length of the cyclic prefix is C;

8) The digital broadcast wireless signal anti-noise transmitter inserts the time-domain training sequence discrete sample value block, that is, the frame header, into the peak-to-average power ratio time-domain cyclic prefix discrete coded data sample block, that is, the frame body, to form a signal frame;

9) The digital broadcast wireless signal anti-noise transmitter adopts the square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

10) Digital broadcast wireless signal anti-noise transmitter converts the baseband signal up-converted to the carrier to form a radio frequency signal and transmit it to the wireless channel in the air;

11) The digital broadcast wireless signal anti-noise receiver detects and receives the radio frequency signal sent by the digital broadcast wireless signal anti-noise transmitter and down-converts it to form a baseband signal, and uses the characteristics of the training sequence and the structural characteristics of the signal frame to receive and process the baseband signal.

According to the above-mentioned digital broadcast wireless signal anti-noise transmission method, it is characterized in that: the peak-to-average power ratio of the digital broadcast wireless signal anti-noise transmitter is decomplexed by the time domain discrete coded data sample block Using and sequentially separating the generated time-domain discrete-coded data sample odd sub-block and time-domain discrete-coded data sample even-sub-block according to the sequence parity of each time-domain discrete coded data sample value to perform signal power adjustment and corresponding signal processing and It is re-synthesized through 18 specially designed generation modes; the training sequence of the digital broadcast wireless signal anti-noise transmitter is composed of the first training sequence and the second training sequence; the first training sequence is composed of constant envelope zero autocorrelation CAZAC sequence B and Each symbol of the pseudo-random PN sequence A is alternately inserted into a new sequence and a cyclic prefix of length G; the second training sequence is composed of a constant envelope zero autocorrelation CAZAC sequence-B ^* and each of the pseudo-random PN sequence A ^* A new sequence generated by alternate insertion of a symbol and a cyclic prefix of length G; B ^* means to perform conjugate operation processing on each symbol of B, A ^* means to perform conjugate operation processing on each symbol of A, B and A has the same symbol length L; the cyclic prefix length G of the first training sequence and the second training sequence is 1/8 of the symbol length L of the first training sequence and the second training sequence; digital broadcast wireless signal anti-noise transmitter signal The cyclic prefix length C of the frame is 1/16 of the length K of the FFT coded data block; the service index sequence of the digital broadcast wireless signal anti-noise transmitter has pseudo-random characteristics and is realized by a set of shifted m sequences; the digital broadcast wireless signal anti-noise Each different service index sequence of the transmitter contains and uniquely expresses the system parameters and business mode information of the digital broadcast wireless signal anti-noise transmitter; the FFT coded data block of the digital broadcast wireless signal anti-noise transmitter is composed of subcarriers, The carrier frequency interval is one of 2KHz, 4KHz, and 1KHz; the encoding rate of LDPC encoding for input data is one of 1/4, 1/2, 5/8, 3/4, and 7/8. The anti-noise receiver of digital broadcast wireless signal can make full use of the characteristics of the training sequence and the structural characteristics of the signal frame for baseband signal reception processing, including joint iterative separation processing of the time-frequency domain of the signal frame header and signal frame body.

Features of the present invention:

The invention is a framing modulation scheme of mixing time domain and frequency domain. In the present invention, the time-domain discretely coded data sample blocks are demultiplexed and sequentially separated to generate time-domain discretely coded data sample odd sub-blocks and time-domain discretely coded data samples according to the order of each time-domain discretely coded data sample. Even sub-blocks and their corresponding signal power adjustment and signal processing, generation mode of 18 kinds of time-domain discrete coded data sample blocks with reduced peak-to-average power ratio through specific design and reduced peak-to-average power ratio with the lowest peak-to-average power ratio The time-domain discrete coded data sample block selection method can not only make full use of the maximum peak power of the OFDM signal, but the probability of the high peak power signal is very low, and the real part (or imaginary part) of the OFDM signal when the number of subcarriers is large It is a complex Gaussian random process and the amplitude obeys the characteristics of Rayleigh distribution, so as to effectively change the power distribution law of the framed signal with low complexity to achieve the purpose of reducing the peak-to-average power ratio. The original signal of the OFDM signal is obtained by processing and recovering at the receiver, and at the same time, the orthogonality characteristic of the sub-carrier signal will not be destroyed and additional nonlinear distortion will not be generated. The training sequence in the signal frame of the digital broadcast wireless signal anti-noise transmitter is obtained by the constant envelope zero autocorrelation CAZAC sequence and the pseudo-random PN sequence through a specific optimization design, and the signal frame of the digital broadcast wireless signal anti-noise transmitter is determined by the time domain The discrete sample block of the training sequence, that is, the frame header, is inserted into the reduced peak-to-average power ratio time-domain cyclic prefix to form a discrete coded data sample block, that is, the frame body, which ensures that the digital broadcast wireless signal anti-noise receiver can achieve fast and accurate frame synchronization , frequency synchronization, time synchronization, estimation of channel transmission characteristics, and reliable tracking of phase noise and channel transmission characteristics. The cyclic prefix is inserted as a guard interval into the time-domain discrete coded data sample block with reduced peak-to-average power ratio to form a signal frame body, which can reduce the interference effect between the signal frame header and the frame body data. Channel coding the input data with LDPC codes provides error correction performance close to the Shannon limit. The different service index sequences of the digital broadcast wireless signal anti-noise transmitter contain and uniquely express the system parameters and business mode information of the digital broadcast wireless signal anti-noise transmitter, which can enable the digital TV digital broadcast wireless transmission system to provide free TV broadcasting, paid TV broadcasting, confidential information transmission, digital value-added services, etc. can control multiple services to meet social needs. The transmission method of the present invention has many advantages such as low peak-to-average power ratio, short synchronization time, small clock jitter, anti-channel fading, anti-channel interference, high data rate and controllable multi-service digital TV digital broadcasting wireless transmission and the like.

Description of drawings

FIG. 1 is a schematic diagram of an embodiment of signal transmission between a certain transmitter and a receiver in a digital broadcast wireless signal anti-noise transmission method according to the present invention.

FIG. 2 is a schematic diagram of an embodiment of signal frame formation during signal transmission between a certain transmitter and a receiver in a digital broadcast wireless signal anti-noise transmission method according to the present invention.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

According to the schematic diagram of an embodiment of signal transmission between a transmitter and a receiver of the digital broadcast wireless signal anti-noise transmission method proposed by the present invention, as shown in Figure 1, the following steps are carried out:

1) The certain digital broadcast wireless signal anti-noise transmitter converts the multimedia data stream into a bit stream through a media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form an input data bit stream;

2) The certain digital broadcast wireless signal anti-noise transmitter encodes its input data bit stream in the frequency domain through LDPC to form an FFT coded data block. LDPC represents low-density parity check, and the length of the FFT coded data block is K. The value of K takes an even number; the encoding rate of LDPC encoding for input data is one of 1/4, 1/2, 5/8, 3/4 and 7/8;

3) The anti-noise transmitter of a certain digital broadcast wireless signal uses IFFT to transform the FFT coded data block into a time-domain discrete coded data sample block D _total =[d ₀ , d ₁ ,..., d _K-2 , d _{K- 1} ];

4) The certain digital broadcast wireless signal anti-noise transmitter demultiplexes the time-domain discretely coded data sample blocks and separates and generates time-domain discretely coded data samples according to the order of each time-domain discretely coded data sample. Odd sub-block _Dodd =[d ₀ ,d ₂ ,…,d _K-4 ,d _K-2 ] and even sub-block _Deven =[d ₁ ,d ₃ ,…,d _{K -3} , dK _-1 ];

生成模式3为

生成模式4为

生成模式5为

生成模式6为生成模式7为D_new=[D^* _奇，D_偶]，生成模式8为

生成模式9为

生成模式10为

生成模式11为

生成模式12为生成模式13为D_new=[D_奇，D^* _偶]，生成模式14为

生成模式15为

生成模式16为

生成模式17为

生成模式18为

比较18种生成模式合成的时域离散编码数据样值块D_new，选取其中具有最低峰均功率比的降峰均功率比时域离散编码数据样值块

并将降峰均功率比时域离散编码数据样值块

所对应采用的生成模式信息发送给业务指标序列设置单元，其中，D^* _奇表示对时域离散编码数据样值奇子块D_奇的各时域离散编码数据样值进行共轭运算处理而得到的时域离散编码数据样值子块；D^* _偶表示对时域离散编码数据样值偶子块D_偶的各时域离散编码数据样值进行共轭运算处理而得到的时域离散编码数据样值子块；5) The certain digital broadcast wireless signal anti-noise transmitter adjusts the signal power of the time-domain discrete coded data sample odd sub-block _Dodd and the time-domain discrete coded data sample even sub-block Deven through the peak- _to -average power ratio adjustment unit And the corresponding signal processing and re-synthesis of a new time-domain discrete coded data sample block _Dnew , the new time-domain discrete coded data sample block _Dnew is obtained by the following generation mode, generation mode 1 is _Dnew =[ _Dodd ,D _Even ], the generation mode 2 is

Generate schema 3 as

Generate schema 4 as

Generate schema 5 as

Generate schema 6 as Generation mode 7 is D _new = [D ^* _odd , D _even ], generation mode 8 is

Generate schema 9 as

Generate schema 10 as

Generate schema 11 as

Generate schema 12 as Generation mode 13 is D _new = [D _odd , D ^* _even ], generation mode 14 is

Generate schema 15 as

Generate schema 16 as

Generate schema 17 as

Generate schema 18 as

Compare the time-domain discrete-coded data sample block D _new synthesized by 18 generation modes, and select the time-domain discrete-coded data sample block with the lowest peak-to-average power ratio

and reduce the peak-to-average power ratio time-domain discretely coded data sample block

The generated mode information correspondingly adopted is sent to the service indicator sequence setting unit, wherein, D ^* _odd means that the time-domain discrete-coded data samples of the odd sub-block Dodd of _the time-domain discrete-coded data samples are conjugated and processed to obtain The time-domain discretely coded data sample sub-block; D ^* _even represents the time-domain discretely coded data obtained by performing conjugate operation on _each time-domain discretely coded data sample of the time-domain discretely coded data sample even sub-block Deven sample sub-block;

6) The digital broadcast wireless signal anti-noise transmitter inserts the service index sequence behind the training sequence to form a time-domain training sequence discrete sample block in the time domain. The service index sequence contains and uniquely expresses the digital broadcast wireless signal anti-noise Various system parameters and business mode information of the transmitter;

7) The digital radio signal anti-noise transmitter inserts the cyclic prefix as a guard interval into the time-domain discrete coded data sample block with reduced peak-to-average power ratio to form a discrete-coded data sample block with reduced peak-to-average power ratio time domain cyclic prefix , as the frame body, the length of the cyclic prefix is C;

8) The certain digital broadcast wireless signal anti-noise transmitter inserts the time-domain training sequence discrete sample value block, that is, the frame header, into the peak-to-average power ratio time-domain cyclic prefix discrete coded data sample block, that is, the frame body, to form a signal frame ;

9) The certain digital broadcast wireless signal anti-noise transmitter adopts a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

10) The certain digital broadcast wireless signal anti-noise transmitter up-converts the baseband signal to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air;

11) The digital broadcast wireless signal anti-noise receiver detects and receives the radio frequency signal sent by the digital broadcast wireless signal anti-noise transmitter and down-converts it to form a baseband signal, and uses the training sequence characteristics and the structural characteristics of the signal frame to perform baseband signal processing. Receive processing.

According to the schematic diagram of an embodiment of signal frame formation during the signal transmission process between a transmitter and a receiver of the digital broadcast wireless signal anti-noise transmission method of the present invention, as shown in Figure 2, the specific implementation is as follows:

The certain digital broadcast wireless signal anti-noise transmitter converts the multimedia data stream into a bit stream through a media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form an input data bit stream.

The certain digital broadcast wireless signal anti-noise transmitter encodes its input data bit stream in the frequency domain through LDPC to form an FFT coded data block. The coded data sample block is generated by the peak-to-average power ratio adjustment unit, and the time-domain discrete coded data sample block with the lowest peak-to-average power ratio is selected, and the corresponding generation mode information is sent to the service index sequence Set up the unit.

The FFT encoded data block of this certain digital broadcast wireless signal anti-noise transmitter is composed of subcarriers, and the frequency interval of subcarriers is one of 2KHz, 4KHz, and 1KHz; the encoding rate of LDPC encoding for input data is 1/4, One of 1/2, 5/8, 3/4 and 7/8.

The training sequence of this certain digital broadcast wireless signal anti-noise transmitter is made up of the first training sequence and the second training sequence; the first training sequence is composed of each symbol of the constant envelope zero autocorrelation CAZAC sequence B and the pseudo-random PN sequence A The new sequence generated by alternate insertion and its cyclic prefix of length G; the second training sequence is a new sequence generated by alternately inserting each symbol of the constant envelope zero autocorrelation CAZAC sequence-B ^* and the pseudo-random PN sequence A ^* and Its length is composed of cyclic prefixes of G; B ^* means to perform conjugate operation processing on each symbol of B, A ^* means to perform conjugate operation processing on each symbol of A, and B and A have the same symbol length L; The cyclic prefix length G of the first training sequence and the second training sequence is 1/8 of the symbol length L of the first training sequence and the second training sequence.

The anti-noise transmitter of a certain digital broadcast wireless signal inserts a service index sequence after the training sequence to form discrete sample value blocks of the time-domain training sequence in the time domain.

The service index sequence of the certain digital broadcast wireless signal anti-noise transmitter has a pseudo-random characteristic, and is realized by a group of shifted m sequences; the various service index sequences of the certain digital broadcast wireless signal anti-noise transmitter contain and It uniquely expresses the system parameters and business mode information of the digital broadcast wireless signal anti-noise transmitter.

This certain digital broadcast wireless signal anti-noise transmitter inserts the cyclic prefix as a guard interval into the time-domain discrete coded data sample block with reduced peak-to-average power ratio to form a discrete-coded data sample block with reduced peak-to-average power ratio time domain cyclic prefix, as The frame body, the length of the cyclic prefix is C; the certain digital broadcast wireless signal anti-noise transmitter inserts the time-domain training sequence discrete sample block, that is, the frame header, into the peak-to-average power ratio time-domain cyclic prefix discrete coded data sample block That is, the frame body to form a signal frame; the length C of the cyclic prefix of the signal frame of a certain digital broadcast wireless signal anti-noise transmitter is 1/16 of the length K of the FFT coded data block.

The anti-noise transmitter of a certain digital broadcast wireless signal adopts a square root raised cosine roll-off filter to perform pulse shaping on the signal of the signal frame.

The certain digital broadcast wireless signal anti-noise transmitter converts the baseband signal to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air.

The digital broadcast wireless signal anti-noise receiver detects and receives the radio frequency signal sent by the digital broadcast wireless signal anti-noise transmitter and converts it down to form a baseband signal, and uses the characteristics of the training sequence and the structural characteristics of the signal frame to receive and process the baseband signal , including joint iterative separation processing of the time-frequency domain of the signal frame header and the signal frame body.

The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and those skilled in the art can make various modifications without departing from the spirit and scope of the claims of the application modify or remodel.

Claims (6)

1. A digital broadcast wireless signal anti-noise transmission method is characterized in that it comprises the following steps: 1) Digital radio wireless signal anti-noise transmitter converts the multimedia data stream into a bit stream through the media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form the input data bit stream; 2) The digital broadcast wireless signal anti-noise transmitter encodes its input data bits in the frequency domain through LDPC to form an FFT coded data block. LDPC means low-density parity check. The length of the FFT coded data block is K, and the value of K take an even number; 3) The digital broadcast wireless signal anti-noise transmitter uses IFFT to transform the FFT coded data block into a time-domain discrete coded data sample block D _total =[d ₀ , d ₁ ,..., d _K-2 , d _K-1 ]; 4) The digital broadcast wireless signal anti-noise transmitter demultiplexes the time-domain discrete coded data sample blocks and separates them in turn according to the order of each time-domain discrete coded data sample to generate odd sub-blocks of time-domain discrete coded data samples _Dodd =[d ₀ ,d ₂ ,…,d _K-4 ,d _K-2 ] and time-domain discrete coded data sample value even block _Deven =[d ₁ ,d ₃ ,…,d _K-3 , dK _-1 ]; 5) The anti-noise transmitter of the digital broadcasting wireless signal adjusts the signal power of the odd sub-block Dodd of the time-domain discretely coded data samples _{and the even} sub-block D of the time-domain discretely coded data samples through the peak-to-average power ratio adjustment unit and the corresponding signal Process and re-synthesize a new time-domain discretely coded data sample block _Dnew , the new time-domain discretely coded data sample block _Dnew is obtained using the following generation mode, generation mode 1 is _Dnew =[ _Dodd , _Deven ], Generate schema 2 as

Generate schema 3 as Generate schema 4 as Generate schema 5 as

Generate schema 6 as

Generation mode 7 is D _new = [D ^* _odd , D _even ], generation mode 8 is

Generate schema 9 as

Generate schema 10 as Generate schema 11 as

Generate schema 12 as

Generation mode 13 is D _new = [D _odd , D ^* _even ], generation mode 14 is

Generate schema 15 as

Generate schema 16 as

Generate schema 17 as

Generate schema 18 as

Compare the time-domain discrete-coded data sample block D _new synthesized by 18 generation modes, and select the time-domain discrete-coded data sample block with the lowest peak-to-average power ratio

and reduce the peak-to-average power ratio time-domain discretely coded data sample block The generated mode information correspondingly adopted is sent to the service indicator sequence setting unit, wherein, D ^* _odd means that the time-domain discrete-coded data samples of the odd sub-block Dodd of _the time-domain discrete-coded data samples are conjugated and processed to obtain The time-domain discretely coded data sample sub-block; D ^* _even represents the time-domain discretely coded data obtained by performing conjugate operation on _each time-domain discretely coded data sample of the time-domain discretely coded data sample even sub-block Deven sample sub-block; 6) The digital broadcast wireless signal anti-noise transmitter inserts the service index sequence behind the training sequence to form a time-domain training sequence discrete sample value block in the time domain. The service index sequence contains and uniquely expresses the digital broadcast wireless signal anti-noise transmitter System parameters and business model information; 7) The digital broadcast wireless signal anti-noise transmitter inserts the cyclic prefix as a guard interval into the time-domain discrete coded data sample block with reduced peak-to-average power ratio to form a discrete-coded data sample block with reduced peak-to-average power ratio time domain cyclic prefix as a frame Body, the length of the cyclic prefix is C; 8) The digital broadcast wireless signal anti-noise transmitter inserts the time-domain training sequence discrete sample value block, that is, the frame header, into the peak-to-average power ratio time-domain cyclic prefix discrete coded data sample block, that is, the frame body, to form a signal frame; 9) The digital broadcast wireless signal anti-noise transmitter adopts the square root raised cosine roll-off filter to shape the signal pulse of the signal frame; 10) Digital broadcast wireless signal anti-noise transmitter converts the baseband signal up-converted to the carrier to form a radio frequency signal and transmit it to the wireless channel in the air; 11) The digital broadcast wireless signal anti-noise receiver detects and receives the radio frequency signal sent by the digital broadcast wireless signal anti-noise transmitter and down-converts it to form a baseband signal, and uses the characteristics of the training sequence and the structural characteristics of the signal frame to receive and process the baseband signal. 2. by the digital broadcast wireless signal anti-noise transmission method of claim 1, it is characterized in that: described training sequence is made up of the first training sequence and the second training sequence; The first training sequence is by constant envelope zero autocorrelation CAZAC sequence B The new sequence generated by alternately inserting each symbol of the pseudo-random PN sequence A and its cyclic prefix of length G; the second training sequence is composed of the constant envelope zero autocorrelation CAZAC sequence-B ^* and the pseudo-random PN sequence A ^* Each symbol is alternately inserted into a new sequence and a cyclic prefix of length G; B ^* means to perform conjugate operation processing on each symbol of B, A ^* means to perform conjugate operation processing on each symbol of A, and B Has the same symbol length L as A. 3. by the anti-noise transmission method of digital broadcast wireless signal of claim 1, it is characterized in that: described C gets 1/16 of K; Described G gets 1/8 of L; The coding rate that input data is carried out LDPC coding One of 1/4, 1/2, 5/8, 3/4 and 7/8. 4. The anti-noise transmission method of digital broadcast wireless signals according to claim 1, characterized in that: said service index sequence has a pseudo-random property, and is realized by a group of shifted m sequences. 5. The anti-noise transmission method of digital broadcast wireless signal according to claim 1, characterized in that: said FFT coded data block is made up of subcarriers, and the frequency interval of subcarriers is one of 2KHz, 4KHz, 1KHz. 6. The digital broadcast wireless signal anti-noise transmission method according to claim 1, characterized in that: the baseband signal receiving process carried out by the digital broadcast wireless signal anti-noise receiver, one of the steps is signal frame header and signal frame body The time-frequency domain joint iterative separation process.

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