CN103763282A - Wireless multimedia broadcast signal framing modulation method - Google Patents

Abstract

The invention discloses a wireless multimedia broadcasting signal framing modulation method, which is a framing modulation scheme of mixing time domain and frequency domain. The training sequence optimization design, signal generation mode and signal selection method of the wireless multimedia broadcasting signal framing modulation 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

Frame modulation method of wireless multimedia broadcasting signal

technical field

The invention belongs to the field of wireless communication, and more specifically relates to a method for framing and modulating wireless multimedia broadcasting signals.

Background technique

At present, television broadcasting has gradually developed from analog to digital. Digital TV wireless multimedia broadcasting transmission system, as an important part of digital TV wireless multimedia broadcasting, 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 wireless multimedia broadcasting related technologies and related industries are industries with rapid development and good market prospects in the field of communication and computer. In terms of technologies related to digital TV wireless multimedia broadcasting, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile solutions for digital TV wireless multimedia broadcasting in a complex wave propagation environment. The framing modulation technology of the wireless multimedia broadcasting signal transmitter is the key technology of the digital TV wireless multimedia broadcasting 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 wireless multimedia broadcasting.

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 the digital TV wireless multimedia broadcasting communication system is affected by factors such as synchronization time, clock jitter, channel fading, and channel interference. The framing modulation method of wireless multimedia broadcasting signal transmitter is the key technology to realize reliable digital TV wireless multimedia broadcasting.

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

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

A kind of wireless multimedia broadcasting signal framing modulation method that the present invention proposes is characterized in that it comprises the following steps:

1) The wireless multimedia broadcast signal transmitter forms an FFT data block with its input data bit stream in the frequency domain, the length of the FFT data block is K, and the value of K is an even number;

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

3) The wireless multimedia broadcasting signal transmitter demultiplexes the time-domain discrete data sample value blocks and separates them sequentially according to the sequence parity of each time-domain discrete data sample value to generate the time-domain discrete data sample value odd sub-block _Dodd =[d ₀ , d ₂ , ..., d _K-4 , d _K-2 ] and time-domain discrete data sample value even sub-block D _even = [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数据样值块

并将降峰均功率比时域离散数据样值块

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^* _奇表示对时域离散数据样值奇子块D_奇的各时域离散数据样值进行共轭运算处理而得到的时域离散数据样值子块；D^* _偶表示对时域离散数据样值偶子块D_偶的各时域离散数据样值进行共轭运算处理而得到的时域离散数据样值子块；4) The wireless multimedia broadcast signal transmitter performs signal power adjustment and corresponding signal processing and recombination on the odd sub-block _Dodd of discrete data samples in the time domain and the _even sub-block Deven of discrete data samples in the time domain through the peak-to-average power ratio adjustment unit The new time-domain discrete data sample block _Dnew , the new time-domain discrete data sample block _Dnew is obtained by the following generation mode, the generation mode 1 is _Dnew = [D _odd , D _even ], and the generation mode 2 is

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

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

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

and reduce the peak-to-average power ratio time-domain discrete data sample blocks

The generated mode information correspondingly adopted is sent to the service index sequence setting unit, wherein, D ^* _odd represents the time domain discrete data sample value obtained by performing conjugate operation processing on each time domain discrete data sample value of the odd sub- _block D odd value of the time domain discrete data sample value Domain discrete data sample value sub-block; D ^* _even represents the time domain discrete data sample value sub-block obtained by carrying out conjugate operation processing on _each time domain discrete data sample value of the time domain discrete data sample value even sub block D even;

5) The wireless multimedia broadcast signal transmitter inserts the service index sequence behind the training sequence to form a time-domain embedded training sequence discrete sample block in the time domain. The service index sequence contains and uniquely expresses each system parameter of the wireless multimedia broadcast signal transmitter and business mode information; the length of the time-domain embedded training sequence discrete sample block is numerically equal to the length of the peak-to-average power ratio time-domain discrete data sample block;

6) The wireless multimedia broadcasting signal transmitter directly superimposes the time-domain discrete data sample blocks with reduced peak-to-average power ratio and time-domain embedded training sequence discrete sample blocks to form time-domain embedded training sequence reduced peak-to-average power ratio time-domain discrete data samples block, as a frame body;

7) The wireless multimedia broadcasting signal transmitter uses the cyclic prefix as a guard interval, that is, inserts the frame header into the time domain, embeds the training sequence, reduces the peak-to-average power ratio, and the discrete data sample block in the time domain, that is, the frame body, to form a signal frame, and the length of the cyclic prefix is C ;

8) The wireless multimedia broadcast signal transmitter uses a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

9) The wireless multimedia broadcasting signal transmitter up-converts the baseband signal to the carrier.

According to the above-mentioned wireless multimedia broadcast signal framing modulation method, it is characterized in that: the peak-to-average power ratio of the wireless multimedia broadcast signal transmitter is demultiplexed by the time domain discrete data sample block and according to each The odd and even sub-blocks of discrete data samples in the time domain and the even sub-blocks of discrete data samples in the time domain generated by the sequential parity and odd separation of discrete data samples in the time domain are used for signal power adjustment and corresponding signal processing, and are generated through 18 types of specific design. The training sequence of the wireless multimedia broadcast signal transmitter is composed 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 a 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 cyclic prefix length C of the wireless multimedia broadcast signal transmitter signal frame is the FFT data block length 1/16 of K; the service index sequence of the wireless multimedia broadcast signal transmitter has pseudo-random characteristics, and is realized by a set of shifted m sequences; each different service index sequence of the wireless multimedia broadcast signal transmitter contains and uniquely expresses the wireless Various system parameters and business mode information of the multimedia broadcast signal transmitter; the FFT data block of the wireless multimedia broadcast signal transmitter is composed of subcarriers, and the frequency interval of the subcarriers is one of 2KHz, 4KHz, and 1KHz.

Features of the present invention:

The invention is a framing modulation scheme of mixing time domain and frequency domain. The time-domain discrete data sample value blocks of the present invention are demultiplexed and sequentially separated to generate time-domain discrete data sample value odd sub-blocks and time-domain discrete data sample value even sub-blocks and Its corresponding signal power adjustment and signal processing, 18 kinds of specially designed generation modes of time-domain discrete data sample blocks with reduced peak-to-average power ratio and time-domain discrete data samples with reduced peak-to-average power ratio The value block selection method can not only make full use of the high peak power of the OFDM signal, but the probability of the high peak power signal is very low. When the number of subcarriers is large, the real part (or imaginary part) of the OFDM signal is a complex Gaussian random process and The amplitude obeys the characteristics of Rayleigh distribution and effectively changes the power distribution law of the framed signal with low complexity to reduce the peak-to-average power ratio. The generation mode adopted requires a small amount of additional information to be sent, which is easy to process and restore at the receiver The original signal of the OFDM signal is obtained without destroying the orthogonality characteristic of the sub-carrier signal and generating additional nonlinear distortion. The training sequence in the signal frame of the wireless multimedia broadcast signal transmitter is obtained by a constant envelope zero autocorrelation CAZAC sequence and a pseudo-random PN sequence through a specific optimization design. The time domain embedded training sequence of the wireless multimedia broadcast signal transmitter reduces the peak-to-average power The time-domain discrete data sample block is formed by directly superimposing the peak-to-average power ratio time-domain discrete data sample block and the time-domain embedded training sequence discrete sample block, which ensure that the wireless multimedia broadcasting signal receiver can realize fast Accurate frame synchronization, frequency synchronization, time synchronization, estimation of channel transmission characteristics, and reliable tracking of phase noise and channel transmission characteristics. Inserting the cyclic prefix as a guard interval into time-domain embedded training sequence to reduce peak-to-average power ratio time-domain discrete data sample blocks to form a signal frame can reduce the interference between adjacent signal frames. Each different service index sequence of the wireless multimedia broadcasting signal transmitter contains and uniquely expresses the system parameters and business mode information of the wireless multimedia broadcasting signal transmitter, which can enable the digital TV wireless multimedia broadcasting transmission system to provide free TV broadcasting, paid TV broadcasting, confidential information transmission, multimedia value-added services, etc. can control multiple services to meet social needs. The framing modulation 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 wireless multimedia broadcast transmission.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of a transmitter of a wireless multimedia broadcasting signal framing modulation method according to the present invention.

Fig. 2 is a schematic diagram of an embodiment of a transmitter signal framing modulation according to a wireless multimedia broadcasting signal framing modulation method of 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 embodiment of a certain transmitter of the wireless multimedia broadcasting signal framing modulation method proposed by the present invention, as shown in Figure 1, carry out according to the following steps:

1) The certain wireless multimedia broadcasting signal transmitter forms an FFT data block with its input data bit stream in the frequency domain, the length of the FFT data block is K, and the value of K is an even number;

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

3) The certain wireless multimedia broadcasting signal transmitter demultiplexes the time-domain discrete data sample value blocks and separates them sequentially according to the sequence parity of each time-domain discrete data sample value to generate the time-domain discrete data sample value odd sub-block D _odd =[d ₀ , d ₂ ,..., d _K-4 , d _K-2 ] and time-domain discrete data sample value even sub-block D _even =[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数据样值块并将降峰均功率比时域离散数据样值块

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^* _奇表示对时域离散数据样值奇子块D_奇的各时域离散数据样值进行共轭运算处理而得到的时域离散数据样值子块；D^* _偶表示对时域离散数据样值偶子块D_偶的各时域离散数据样值进行共轭运算处理而得到的时域离散数据样值子块；4) The certain wireless multimedia broadcasting signal transmitter performs signal power adjustment and corresponding signal processing on the _odd sub-block Dodd of discrete data samples in the time domain and the _even sub-block Deven of discrete data samples in the time domain through the peak-to-average power ratio adjustment unit And re-synthesize a new time-domain discrete data sample block _Dnew , the new time-domain discrete data sample block _Dnew is obtained by the following generation mode, generation mode 1 is _Dnew =[D _odd , D _even ], generation mode 2 for

Generate schema 3 as Generate schema 4 as

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

The generated mode information correspondingly adopted is sent to the service index sequence setting unit, wherein, D ^* _odd represents the time domain discrete data sample value obtained by performing conjugate operation processing on each time domain discrete data sample value of the odd sub- _block D odd value of the time domain discrete data sample value Domain discrete data sample value sub-block; D ^* _even represents the time domain discrete data sample value sub-block obtained by carrying out conjugate operation processing on _each time domain discrete data sample value of the time domain discrete data sample value even sub block D even;

5) The certain wireless multimedia broadcast signal transmitter inserts a service index sequence behind the training sequence to form a time domain embedded training sequence discrete sample block in the time domain, and the service index sequence contains and uniquely expresses the wireless multimedia broadcast signal transmitter Various system parameters and business mode information; the length of the time-domain embedded training sequence discrete sample block is numerically equal to the length of the peak-to-average power ratio time-domain discrete data sample block;

6) The certain wireless multimedia broadcasting signal transmitter directly superimposes the time-domain discrete data sample block with reduced peak-to-average power ratio and the discrete sample value block of time-domain embedded training sequence to form a time-domain embedded training sequence with reduced peak-to-average power ratio time-domain discrete Data sample block, as a frame body;

7) The certain wireless multimedia broadcasting signal transmitter uses the cyclic prefix as a guard interval, that is, the frame header is inserted into the time domain embedding training sequence to reduce the peak-to-average power ratio and the discrete data sample block in the time domain, that is, the frame body, to form a signal frame, and the cyclic prefix length is C;

8) The certain wireless multimedia broadcasting signal transmitter uses a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

9) The certain wireless multimedia broadcasting signal transmitter up-converts the baseband signal to the carrier.

According to an embodiment of a certain transmitter signal framing modulation of the wireless multimedia broadcasting signal framing modulation method of the present invention, as shown in Figure 2, the specific implementation is as follows:

The certain wireless multimedia broadcast signal transmitter forms an FFT data block on its input data bit stream in the frequency domain, and then transforms it into a discrete data sample block in the time domain through IFFT, and generates and selects it through the peak-to-average power ratio adjustment unit Among them, the time-domain discrete data sample block with reduced peak-to-average power ratio with the lowest peak-to-average power ratio sends the corresponding generation mode information to the service index sequence setting unit at the same time.

The FFT data block of the certain wireless multimedia broadcast signal transmitter is composed of subcarriers, and the frequency interval of the subcarriers is one of 2KHz, 4KHz, and 1KHz.

The training sequence of this certain wireless multimedia broadcasting signal transmitter is made up of the first training sequence and the second training sequence; The first training sequence is alternately inserted by each symbol of the constant envelope zero autocorrelation CAZAC sequence B and the pseudo-random PN sequence A The generated new sequence and its length are composed of a cyclic prefix of G; the second training sequence is composed of a constant envelope zero autocorrelation CAZAC sequence-B ^* and each symbol of the pseudo-random PN sequence A ^* is alternately inserted into the new sequence and its length It is composed of the cyclic prefix 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 first training The cyclic prefix length G of the 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 certain wireless multimedia broadcasting signal transmitter inserts a service index sequence after the training sequence to form a time domain embedded training sequence discrete sample value block in the time domain.

The service index sequence of this certain wireless multimedia broadcasting signal transmitter has a pseudo-random characteristic, and is realized by a group of shifted m sequences; each different service index sequence of this certain wireless multimedia broadcasting signal transmitter contains and uniquely expresses wireless Various system parameters and service mode information of the multimedia broadcasting signal transmitter.

The length of the time-domain embedded training sequence discrete sample value block of this certain wireless multimedia broadcasting signal transmitter is numerically equal to the length of the peak-to-average power ratio time-domain discrete data sample value block; the certain wireless multimedia broadcasting signal transmitter The time-domain discrete data sample block with reduced peak-to-average power ratio and the time-domain embedded training sequence discrete sample value block are directly superimposed to form a time-domain embedded training sequence reduced peak-to-average power ratio time-domain discrete data sample block, which is used as a frame body; A wireless multimedia broadcasting signal transmitter uses the cyclic prefix as a guard interval, that is, the frame header is inserted into the time domain embedding training sequence, and the peak-to-average power ratio time domain discrete data sample block is the frame body, to form a signal frame, and the length of the cyclic prefix is C; The cyclic prefix length C of the signal frame of the certain wireless multimedia broadcasting signal transmitter is 1/16 of the length K of the FFT data block.

The certain wireless multimedia broadcasting signal transmitter adopts a square root raised cosine roll-off filter to pulse-shape the signal of the signal frame.

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 wireless multimedia broadcasting signal framing modulation method is characterized in that it comprises the following steps: 1) The wireless multimedia broadcast signal transmitter forms an FFT data block with its input data bit stream in the frequency domain, the length of the FFT data block is K, and the value of K is an even number; 2) The wireless multimedia broadcasting signal transmitter uses IFFT to transform the FFT data block into a time-domain discrete data sample block D _total =[d ₀ , d ₁ ,..., d _K-2 , d _K-1 ]; 3) The wireless multimedia broadcasting signal transmitter demultiplexes the time-domain discrete data sample value blocks and separates them sequentially according to the sequence parity of each time-domain discrete data sample value to generate the time-domain discrete data sample value odd sub-block _Dodd =[d ₀ , d ₂ , ..., d _K-4 , d _K-2 ] and time-domain discrete data sample value even sub-block D _even = [d ₁ , d ₃ , ..., d _K-3 , d _K-1 ]; 4) The wireless multimedia broadcast signal transmitter performs signal power adjustment and corresponding signal processing and recombination on the _odd sub-block Dodd of discrete data samples in the time domain and the _even sub-block Deven of discrete data samples in the time domain through the peak-to-average power ratio adjustment unit The new time-domain discrete data sample block _Dnew , the new time-domain discrete data sample block _Dnew is obtained by the following generation mode, the generation mode 1 is _Dnew = [D _odd , D _even ], and 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 data sample block D _new synthesized by 18 generation modes, and select the time-domain discrete data sample block with the lowest peak-to-average power ratio

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

The generated mode information correspondingly adopted is sent to the service index sequence setting unit, wherein, D ^* _odd represents the time domain discrete data sample value obtained by performing conjugate operation processing on each time domain discrete data sample value of the odd sub- _block D odd value of the time domain discrete data sample value Domain discrete data sample value sub-block; D ^* _even represents the time domain discrete data sample value sub-block obtained by carrying out conjugate operation processing on _each time domain discrete data sample value of the time domain discrete data sample value even sub block D even; 5) The wireless multimedia broadcast signal transmitter inserts the service index sequence behind the training sequence to form a time-domain embedded training sequence discrete sample block in the time domain. The service index sequence contains and uniquely expresses each system parameter of the wireless multimedia broadcast signal transmitter and business mode information; the length of the time-domain embedded training sequence discrete sample block is numerically equal to the length of the peak-to-average power ratio time-domain discrete data sample block; 6) The wireless multimedia broadcasting signal transmitter directly superimposes the time-domain discrete data sample blocks with reduced peak-to-average power ratio and time-domain embedded training sequence discrete sample blocks to form time-domain embedded training sequence reduced peak-to-average power ratio time-domain discrete data samples block, as a frame body; 7) The wireless multimedia broadcasting signal transmitter uses the cyclic prefix as a guard interval, that is, inserts the frame header into the time domain, embeds the training sequence, reduces the peak-to-average power ratio, and the discrete data sample block in the time domain, that is, the frame body, to form a signal frame, and the length of the cyclic prefix is C ; 8) The wireless multimedia broadcast signal transmitter uses a square root raised cosine roll-off filter to shape the signal pulse of the signal frame; 9) The wireless multimedia broadcasting signal transmitter up-converts the baseband signal to the carrier. 2. by the wireless multimedia broadcasting signal framing modulation 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. The wireless multimedia broadcasting signal framing modulation method according to claim 1, characterized in that: said C is 1/16 of K. 4. The wireless multimedia broadcast signal framing modulation method 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 wireless multimedia broadcast signal framing modulation method according to claim 1, characterized in that: said FFT data block is made up of subcarriers, and the frequency interval of subcarriers is one of 2KHz, 4KHz, and 1KHz. 6. The wireless multimedia broadcasting signal framing modulation method according to claim 1, characterized in that: said G is 1/8 of L.

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