CN101778076A - Anti-fading wireless multimedia broadcasting signal transmission method - Google Patents
Anti-fading wireless multimedia broadcasting signal transmission method Download PDFInfo
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Abstract
The invention discloses an anti-fading wireless multimedia broadcasting signal transmission method. In the wireless multimedia broadcasting signal transmission method, wireless multimedia broadcasting signals carry out media data stream processing through multimedia data at the wireless multimedia broadcasting transmitter end, RS coding, convolution interlacement, LDPC coding, code element modulation, constellation rotation, code element interlacement, overlapping frames forming by time domain discrete data sample value blocks and time domain embedding training sequence discrete sample value blocks, pulse forming and upper frequency conversion onto carrier waves for forming radio frequency signals to be transmitted to aerial wireless signal channels, and the receiving machine end receives and processes signals sent by the wireless multimedia broadcasting transmitter end. The wireless multimedia broadcasting signal transmission method has the advantages of short receiving synchronous time, anti-fading effect on the transmission environment background, controlled multi-service and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-fading wireless multimedia broadcasting signal transmission method.
Background technology
At present, wireless videocast develops to the digitlization direction gradually from simulation.Digital Television radio transmission system, as the important component part of Digital Television radio broadcasting, its development of technologies, closely bound up with people's quality of life, and therefore be subjected to people's extensive concern especially.Digital Television radio broadcasting correlation technique and related industry thereof are that development is very fast in the Communications And Computer field, the industry of good market prospect.On Digital Television radio broadcasting correlation technique, the emphasis of various countries' concern at present is that the Digital Television radio broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Digital Television radio transmission technology is the key technology of Digital Television wireless broadcast system, for whole system performance decisive role, is the object of everybody primary study.
Because the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes becoming more and more easier.Because of OFDM multi-carrier transmission technology has simple in structure, the availability of frequency spectrum high plurality of advantages such as becomes and extremely everybody concern and obtain deep research and the extensive use in numerous areas such as Xdsl, wide-band mobile communication, wideband wireless local area network, digital television broadcasting in the time of can resisting frequency selectivity and channel.
In the practical communication environment, the ofdm communication system performance is subjected to the influence of factors such as lock in time, clock jitter, channel fading, multi-user's common-channel interference.Anti fading channel coding technology and modulator approach are to realize the key technology of reliable ofdm communication.
Chnnel coding is the important component part of digital communication system.Along with the develop rapidly of modern information technologies, channel coding technology has become the indispensable technology in modern communications field.Embed redundancy symbol in information sequence, the effect of channel coding technology by redundancy symbol reduces signal and makes a mistake in transmission course, thereby improves the reliability of communication system.
Under multidiameter fading channel, can be by outer coding, interior coding, interweave and the cascade optimal design of modulation scheme reaches big as far as possible signal diversifying exponent number, so that in equaling or exceeding the symbol sebolic addressing of minimum free distance, obtain independent decline.The different coding form of cascade can make full use of the advantage of different coding technology; Between coding and code element modulation, insert bit interleaver, can be so that coding be relatively independent with modulated process and expand diversity order to different binary bits number from different multi-system symbolic numbers, thus make diversity order be improved significantly and under multidiameter fading channel, have the bit error performance of getting well.
Utilizing Digital Television radio transmission system that may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service are provided is embodiments that Digital Television radio transmission of new generation system satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of anti-fading wireless multimedia broadcasting signal transmission method, can have anti-fading property and satisfy the needs of High Data Rate may command multi-service Digital Television radio transmission transmission environment.
Desire is done more deep understanding to the patent background can be with reference to following documents and materials:
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Summary of the invention
The present invention is directed to High Data Rate Digital Television radio transmission problem, proposed a kind of anti-fading wireless multimedia broadcasting signal transmission method.
A kind of anti-fading wireless multimedia broadcasting signal transmission method that the present invention proposes is characterized in that wireless multi-media broadcast signal is sent to the on-air radio channel and receives the signal that processing radio multimedium broadcast transmitter end is sent by receiver end through following steps at radio multimedium broadcast transmitter end:
1) radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow;
2) radio multimedium broadcast transmitter end will be imported the data bit RS coding (Reed-Solomon that flows through, RS), convolutional interleave, LDPC coding (Low Density Parity Check, LDPC), further on frequency domain, form the cascade interweaved coding modulation data piece of FFT (length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K) after the code element modulation, constellation rotation, symbol interleave;
3) radio multimedium broadcast transmitter end adopts IFFT (fast discrete Fourier inverse transformation) the cascade interweaved coding modulation data piece of FFT to be transformed to the discrete cascade interweaving encoding modulating data sample value piece of time domain;
4) radio multimedium broadcast transmitter end as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitutes the discrete sample block (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X) of sequence of plural training with training sequence on time domain;
5) radio multimedium broadcast transmitter end will repeat to form for 4 times time domain continuously in the discrete sample block of the sequence of plural training that constitutes on the time domain and embed training sequence discrete sample block (length that time domain embeds training sequence discrete sample block is K, K=4 * X) on time domain;
6) radio multimedium broadcast transmitter end embeds training sequence discrete sample block with the discrete cascade interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed the cascade interweaved coding modulation data piece of training sequence, as frame;
7) radio multimedium broadcast transmitter end inserts time domain with Cyclic Prefix (length of Cyclic Prefix is C) as protection interval (frame head) and embeds the cascade interweaved coding modulation data piece of training sequence (frame), to form signal frame;
8) radio multimedium broadcast transmitter end adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
9) radio multimedium broadcast transmitter end forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
10) receiver end receives and handles the signal that radio multimedium broadcast transmitter end is sent.
A kind of anti-fading wireless multimedia broadcasting signal transmission method according to above-mentioned is characterized in that: radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow; Radio multimedium broadcast transmitter end carries out RS coding (Reed-Solomon to the input data bit flow, RS), convolutional interleave, LDPC (the Low Density Parity Check that encodes, LDPC), the code element modulation, constellation rotation, further on frequency domain, form the cascade interweaved coding modulation data piece of FFT after the symbol interleave, the RS coding combines with convolutional interleave and has very strong antiburst error ability, wherein, the encoding rate of LDPC coding is 1/4,1/2,5/8, in 3/4 and 7/8 one, code element is modulated to QPSK, 16QAM, 64QAM, a kind of with among the 256QAM, symbol constellations figure mapping mode adopts the Gray code mapping, the constellation rotation angle of QPSK symbol constellations is 22.5 degree, the constellation rotation angle of 16QAM symbol constellations is 11.25 degree, the constellation rotation angle of 64QAM symbol constellations is 5.626 degree, the constellation rotation angle of 256QAM symbol constellations is 2.8125 degree, and symbol interleave adopts the random interleaving mode; Have periodic time domain in the signal frame of radio multimedium broadcast transmitter end and embed training sequence discrete sample block; The length X of the training sequence of radio multimedium broadcast transmitter end is in 512,1024,2048, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT is respectively 2048,4096,8192, the frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively 1/4,1/8,1/16 of the cascade interweaved coding modulation data block length of FFT K size; The training sequence of radio multimedium broadcast transmitter end, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; The training sequence of digital television ground broadcast transmitter, operational indicator sequence have orthogonality each other; Each different operational indicator sequence of radio multimedium broadcast transmitter end is comprising and unique each system parameters and business model information of expressing the radio multimedium broadcast transmitter; Receiver end receives handles the signal that radio multimedium broadcast transmitter end is sent.
Characteristics of the present invention:
The present invention is the anti-fading signal diversifying transmission plan that a kind of time-domain and frequency-domain mixes.Radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow.Have periodic time domain in the signal frame of radio multimedium broadcast transmitter end and embed training sequence discrete sample block, the training sequence of radio multimedium broadcast transmitter end, the operational indicator sequence has pseudo-random characteristics, the training sequence of radio multimedium broadcast transmitter end, the operational indicator sequence has orthogonality each other, the time domain embedding training sequence coded data block of radio multimedium broadcast transmitter end is the discrete cascade interweaving encoding modulating data sample value piece by time domain, time domain embeds training sequence discrete sample block and directly superposes and form, and these have guaranteed that radio multimedium broadcast transmitter end can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic reliably followed the tracks of.Radio multimedium broadcast transmitter end inserts time domain with Cyclic Prefix at interval as protection and embeds the training sequence coded data block to form signal frame, can reduce the interference effect between the adjacent signals frame.Radio multimedium broadcast transmitter end adopts and to encode outward, interweaves, the cascade optimal design of interior coding, modulation, constellation rotation, interleaving scheme is carried out cascade interweaved coded modulation to the input data and improved signal diversifying exponent number and anti-interference noise error correcting capability, make communication system under multidiameter fading channel, have good bit error performance, make communication system have anti-fading property the transmission environment background.Each different operational indicator sequence of radio multimedium broadcast transmitter end is comprising and unique each system parameters and business model information of expressing the radio multimedium broadcast transmitter, the radio multimedium broadcast transmission system can satisfy social needs so that can provide may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service.A kind of anti-fading wireless multimedia broadcasting signal transmission method of the present invention makes that receiver lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, the transmission of High Data Rate may command multi-service Digital Television Terrestrial Broadcasting can be provided and the transmission environment background be had plurality of advantages such as anti-fading property.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to signal transmission between certain transmitter and receiver of a kind of anti-fading wireless multimedia broadcasting signal transmission method of the present invention.
Fig. 2 is the embodiment schematic diagram that forms according to signal frame in the signals transmission between certain transmitter and receiver of a kind of anti-fading wireless multimedia broadcasting signal transmission method of the present invention.
Fig. 3 is the embodiment schematic diagram according to the constellation rotation method that the QPSK code element is modulated, the 16QAM code element is modulated of certain radio multimedium broadcast transmitter end of a kind of anti-fading wireless multimedia broadcasting signal transmission method of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
Embodiment according to signal transmission between certain transmitter and receiver of a kind of anti-fading wireless multimedia broadcasting signal transmission method of the present invention, as shown in Figure 1, wireless multi-media broadcast signal is sent to the on-air radio channel and receives the signal that processing radio multimedium broadcast transmitter end is sent by receiver end through following steps at radio multimedium broadcast transmitter end:
1) this certain radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow;
2) this certain radio multimedium broadcast transmitter end will be imported the data bit RS coding (Reed-Solomon that flows through, RS), convolutional interleave (the RS coding of radio multimedium broadcast transmitter end combines with convolutional interleave and has very strong antiburst error ability), LDPC (the Low Density Parity Check that encodes, LDPC) (the data bit of the radio multimedium broadcast transmitter end RS coding (Reed-Solomon that flows through, RS), the encoding rate of the LDPC coding behind the convolutional interleave is 1/4,1/2,5/8, in 3/4 and 7/8 one), code element modulation (the data bit of the radio multimedium broadcast transmitter end RS coding (Reed-Solomon that flows through, RS), convolutional interleave, code element behind the LDPC coding is modulated to QPSK, 16QAM, 64QAM, a kind of with among the 256QAM, symbol constellations figure mapping mode adopts the Gray code mapping), (the constellation rotation angle of QPSK symbol constellations is 22.5 degree to constellation rotation, the constellation rotation angle of 16QAM symbol constellations is 11.25 degree, the constellation rotation angle of 64QAM symbol constellations is 5.626 degree, and the constellation rotation angle of 256QAM symbol constellations is 2.8125 degree), further on frequency domain, form the cascade interweaved coding modulation data piece of FFT (length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K) after the symbol interleave (symbol interleave adopts the random interleaving mode); When X got 512, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 8192, and the frequency interval of corresponding subcarrier is got 1KHz);
3) this certain radio multimedium broadcast transmitter end adopts IFFT (fast discrete Fourier inverse transformation) the cascade interweaved coding modulation data piece of FFT to be transformed to the discrete cascade interweaving encoding modulating data sample value piece of time domain;
4) this certain radio multimedium broadcast transmitter end with training sequence as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, on time domain, constitute the discrete sample block (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and X gets in 512,1024,2048) of sequence of plural training;
5) this certain radio multimedium broadcast transmitter end will repeat to form for 4 times time domain continuously in the discrete sample block of the sequence of plural training that constitutes on the time domain and embed training sequence discrete sample block (length that time domain embeds training sequence discrete sample block is K, K=4 * X) on time domain;
6) this certain radio multimedium broadcast transmitter end embeds training sequence discrete sample block with the discrete cascade interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed the cascade interweaved coding modulation data piece of training sequence, as frame;
7) (length of Cyclic Prefix is C to this certain radio multimedium broadcast transmitter end with Cyclic Prefix; When X got 512, corresponding C got 1/4 of the cascade interweaved coding modulation data block length of FFT K size; When X got 1024, corresponding C got 1/8 of the cascade interweaved coding modulation data block length of FFT K size; When X gets 2048, corresponding C get the cascade interweaved coding modulation data block length of FFT K size 1/16) as protection at interval (frame head) insert time domain and embed the cascade interweaved coding modulation data piece of training sequence (frame), to form signal frame;
8) this certain radio multimedium broadcast transmitter end adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
9) this certain radio multimedium broadcast transmitter end forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
10) this certain receiver end receives and handles the signal that radio multimedium broadcast transmitter end is sent.
Embodiment according to signal frame in the signals transmission between certain transmitter and receiver of a kind of anti-fading wireless multimedia broadcasting signal transmission method of the present invention forms, as shown in Figure 2, specifically implement as follows:
This certain radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow.
This certain radio multimedium broadcast transmitter end will be imported the data bit RS coding (Reed-Solomon that flows through, RS), convolutional interleave, LDPC (the Low Density Parity Check that encodes, LDPC), further on frequency domain, form the cascade interweaved coding modulation data piece of FFT after the code element modulation, constellation rotation, symbol interleave, through IFFT it is transformed to the discrete cascade interweaving encoding modulating data sample value piece of time domain again.
The cascade interweaved coding modulation data piece of this certain radio multimedium broadcast transmitter end FFT is made up of subcarrier.The length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K; When X got 512, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 8192, and the frequency interval of corresponding subcarrier is got 1KHz.
This certain radio multimedium broadcast transmitter end with training sequence as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, on time domain, constitute the discrete sample block of sequence of plural training, on time domain, it is repeated 4 times continuously again and form time domain embedding training sequence discrete sample block.
The length of the discrete sample block of the training sequence of this certain radio multimedium broadcast transmitter end, operational indicator sequence, sequence of plural training all is X, X gets in 512,1024,2048, the length that time domain embeds training sequence discrete sample block is K, K=4 * X.
Training sequence, operational indicator sequence as this certain radio multimedium broadcast transmitter are formed by a series of 1 or-1, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.The training sequence that satisfies above-mentioned feature can be by realizing as one group of displacement m sequence of a kind of specific type of pseudo-random number sequence with as the walsh sequence of orthogonal sequence, Hadamard sequences or by the orthogonal sequence that other modes produce.
This each different operational indicator sequence of certain radio multimedium broadcast transmitter end is comprising and unique each system parameters and business model information of expressing the radio multimedium broadcast transmitter.
This certain radio multimedium broadcast transmitter end embeds training sequence discrete sample block with the discrete cascade interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed the cascade interweaved coding modulation data piece of training sequence, as frame; In the cascade interweaved coding modulation data piece of time domain embedding training sequence, insert Cyclic Prefix at interval, form signal frame as protection.
This certain radio multimedium broadcast transmitter end is C as the length of protection Cyclic Prefix at interval; When X got 512, corresponding C got 1/4 of the cascade interweaved coding modulation data block length of FFT K size; When X got 1024, corresponding C got 1/8 of the cascade interweaved coding modulation data block length of FFT K size; When X got 2048, corresponding C got 1/16 of the cascade interweaved coding modulation data block length of FFT K size.
This certain radio multimedium broadcast transmitter end adopts square root raised cosine filter that the signal of signal frame is carried out pulse shaping.When X got 512, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.1; When X got 1024, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.05; When X got 2048, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.025.
This certain radio multimedium broadcast transmitter end forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave.
This certain receiver end receives handles the signal that radio multimedium broadcast transmitter end is sent.
According to the constellation rotation method of the QPSK code element modulation of certain radio multimedium broadcast transmitter end of a kind of anti-fading wireless multimedia broadcasting signal transmission method of the present invention, the modulation of 16QAM code element embodiment, the symbol constellations figure mapping mode of the QPSK code element of this certain radio multimedium broadcast transmitter end modulation as shown in Figure 3,, the modulation of 16QAM code element adopts the Gray code mapping; The constellation rotation angle of QPSK symbol constellations is 22.5 degree, and the constellation rotation angle of 16QAM symbol constellations is 11.25 degree.
In conjunction with the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to the foregoing description, under the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.
Claims (16)
1. anti-fading wireless multimedia broadcasting signal transmission method is characterized in that wireless multi-media broadcast signal is sent to the on-air radio channel and is received by receiver end through following steps at radio multimedium broadcast transmitter end to handle the signal that radio multimedium broadcast transmitter end is sent:
1) radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow;
2) radio multimedium broadcast transmitter end will be imported data bit RS coding (the Reed Solomon that flows through, RS), convolutional interleave, LDPC coding (Low Density Parity Check, LDPC), further on frequency domain, form the cascade interweaved coding modulation data piece of FFT (length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K) after the code element modulation, constellation rotation, symbol interleave;
3) radio multimedium broadcast transmitter end adopts IFFT (fast discrete Fourier inverse transformation) the cascade interweaved coding modulation data piece of FFT to be transformed to the discrete cascade interweaving encoding modulating data sample value piece of time domain;
4) radio multimedium broadcast transmitter end as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitutes the discrete sample block (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X) of sequence of plural training with training sequence on time domain;
5) radio multimedium broadcast transmitter end will repeat to form for 4 times time domain continuously in the discrete sample block of the sequence of plural training that constitutes on the time domain and embed training sequence discrete sample block (length that time domain embeds training sequence discrete sample block is K, K=4 * X) on time domain;
6) radio multimedium broadcast transmitter end embeds training sequence discrete sample block with the discrete cascade interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed the cascade interweaved coding modulation data piece of training sequence, as frame;
7) radio multimedium broadcast transmitter end inserts time domain with Cyclic Prefix (length of Cyclic Prefix is C) as protection interval (frame head) and embeds the cascade interweaved coding modulation data piece of training sequence (frame), to form signal frame;
8) radio multimedium broadcast transmitter end adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
9) radio multimedium broadcast transmitter end forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
10) receiver end receives and handles the signal that radio multimedium broadcast transmitter end is sent.
2. by a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 1, it is characterized in that: described radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow.
3. press a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 1, it is characterized in that: described radio multimedium broadcast transmitter end will be imported the data bit RS coding (Reed-Solomon that flows through, RS), convolutional interleave, LDPC coding (Low Density Parity Check, LDPC), further on frequency domain, form the cascade interweaved coding modulation data piece of FFT (length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K) after the code element modulation, constellation rotation, symbol interleave.
4. press a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 3, it is characterized in that: the data bit of the described radio multimedium broadcast transmitter end RS coding (Reed-Solomon that flows through, RS), convolutional interleave, RS coding combines with convolutional interleave and realizes the antiburst error ability.
5. by a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 3, it is characterized in that: the flow through encoding rate of the LDPC coding behind RS coding, the convolutional interleave of the data bit of described radio multimedium broadcast transmitter end is in 1/4,1/2,5/8,3/4 and 7/8 one.
6. press a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 3, it is characterized in that: flow through code element behind RS coding, convolutional interleave, the LDPC coding of the data bit of described radio multimedium broadcast transmitter end is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
7. press claim 3 and press a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 6, it is characterized in that: the constellation rotation angle of described QPSK symbol constellations is 22.5 degree, the constellation rotation angle of 16QAM symbol constellations is 11.25 degree, the constellation rotation angle of 64QAM symbol constellations is 5.626 degree, and the constellation rotation angle of 256QAM symbol constellations is 2.8125 degree.
8. by a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 3, it is characterized in that: described symbol interleave adopts the random interleaving mode.
9. by a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described radio multimedium broadcast transmitter end, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
10. press a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 9, it is characterized in that: training sequence, the operational indicator sequence of described radio multimedium broadcast transmitter end have pseudo-random characteristics, and training sequence, the operational indicator sequence of described radio multimedium broadcast transmitter end have orthogonality each other.
11. by a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 1, it is characterized in that: the FFT Bit Interleave coding modulation data piece of described radio multimedium broadcast transmitter end is made up of subcarrier; When X got 512, sub-carrier number K got 2048; When X got 1024, sub-carrier number K got 4096; When X got 2048, sub-carrier number K got 8192.
12. by a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 11, it is characterized in that: when X got 512, the frequency interval of subcarrier was got 4KHz; When X got 1024, the frequency interval of subcarrier was got 2KHz; When X got 2048, the frequency interval of subcarrier was got 1KHz.
13. a kind of anti-fading wireless multimedia broadcasting signal transmission method by claim 1 is characterized in that: the signal frame of described radio multimedium broadcast transmitter end is inserted into time domain embedding training sequence bit interweaving encoding modulated data blocks by Cyclic Prefix and forms.
14. by a kind of anti-fading wireless multimedia broadcasting signal transmission method of claim 1, it is characterized in that: the length of the Cyclic Prefix of described radio multimedium broadcast transmitter end is C; When X got 512, C got 1/4 of K size; When X got 1024, C got 1/8 of K size; When X got 2048, C got 1/16 of K size.
15. a kind of anti-fading wireless multimedia broadcasting signal transmission method by claim 1 is characterized in that: described radio multimedium broadcasting receiver termination is received and is handled the signal that radio multimedium broadcast transmitter end is sent.
16. a kind of anti-fading wireless multimedia broadcasting signal transmission method by claim 1, it is characterized in that: described radio multimedium broadcast transmitter end adopts and encodes outward, interweaves, the cascade optimal design of interior coding, modulation, constellation rotation, interleaving scheme is carried out inside and outside cascade interweaved coded modulation to the input data and improved signal diversifying exponent number and anti-interference noise error correcting capability, makes the radio multimedium broadcast transmission system have anti-fading property to environmental background and have good systematic function under the multidiameter fading channel environment.
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