CN101778077B - Robust wireless multimedia broadcast signal transmission method - Google Patents
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- CN101778077B CN101778077B CN 201010116825 CN201010116825A CN101778077B CN 101778077 B CN101778077 B CN 101778077B CN 201010116825 CN201010116825 CN 201010116825 CN 201010116825 A CN201010116825 A CN 201010116825A CN 101778077 B CN101778077 B CN 101778077B
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Abstract
The invention discloses a robust wireless multimedia broadcast signal transmission method. In the method, the multimedia data stream of a wireless multimedia broadcast signal at a wireless multimedia broadcast transmitter side is converted into a data bit stream by a media data processor, and then BCH coding, bit interleaving, LDPC coding, code element modulating, constellation rotating and code element interleaving are carried out on the data bit stream; a time domain discrete data sample value block and a time domain training sequence-embedded discrete sample value block are stacked to form a frame; pulse shaping and up-conversion are carried out on the frame until a radio-frequency signal is formed on a carrier wave; the radio-frequency signal is transmitted to an air wireless channel, and the signal transmitted by the wireless multimedia broadcast transmitter side is received and processed by a receiver side. The wireless multimedia broadcast signal transmission method has the advantages of short receive synchronization time, robustness on transmission environment background and the like and can control multiple services.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of method for transmitting robust wireless multi-media broadcast signal.
Background technology
At present, wireless videocast develops to the digitlization direction from simulation gradually.DTV radio transmission system, as the important component part of DTV radio broadcasting, its development of technologies, closely bound up with people's quality of life, and therefore received people's extensive concern especially.DTV 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 DTV radio broadcasting correlation technique, the emphasis of various countries' concern at present is that the DTV radio broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.DTV radio transmission technology is the key technology of DTV 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 is high, plurality of advantages such as becomes in the time of can resisting frequency selectivity and channel 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 practical communication environment, the ofdm communication system performance receives the influence of factors such as lock in time, clock jitter, channel fading, multi-user's common-channel interference.The channel coding technology of robust 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.In information sequence, embed redundancy symbol, the effect of channel coding technology through redundancy symbol reduces signal and in transmission course, makes a mistake, thereby improves the reliability of communication system.
Under multidiameter fading channel, can be through 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.Cascade different coding form 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 DTV 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 DTV 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 method for transmitting robust wireless multi-media broadcast signal, can have robustness and satisfy the needs of High Data Rate may command multi-service DTV 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 DTV radio transmission problem, proposed a kind of method for transmitting robust wireless multi-media broadcast signal.
A kind of method for transmitting robust wireless multi-media broadcast signal 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 data bit Bose-Chaudhuri-Hocquenghem Code (the Bose ChaudhuriHocquenghem that flows through; BCH), Bit 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 is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel;
10) receiver end receives and handles the signal that radio multimedium broadcast transmitter end is sent.
A kind of method for transmitting robust wireless multi-media broadcast signal 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 Bose-Chaudhuri-Hocquenghem Code (Bose Chaudhuri Hocquenghem to the input data bit flow; BCH), Bit 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, wherein, Bit Interleave adopts the random interleaving mode; The encoding rate of LDPC coding is 1/4, among the l/2,5/8,3/4 and 7/8 one; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping, and 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, and 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 the l/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 service index series 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 robust 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; Training sequence, the operational indicator sequence of radio multimedium broadcast transmitter end have pseudo-random characteristics; Training sequence, the operational indicator sequence of radio multimedium broadcast transmitter end have orthogonality each other; It is that discrete cascade interweaving encoding modulating data sample value piece, time domain by time domain embeds directly stack and forming of training sequence discrete sample block that the time domain of radio multimedium broadcast transmitter end embeds the training sequence coded data block, and these have guaranteed that radio multimedium broadcast transmitter end can realize fast and accurately frame synchronization, Frequency Synchronization, time synchronized, channel transfer characteristic estimation and phase noise and channel transfer characteristic are 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 and modulation 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 robustness the transmission environment background.Each different service index series 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 method for transmitting robust wireless multi-media broadcast signal 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 DTTB can be provided and the transmission environment background is had plurality of advantages such as robustness.
Description of drawings
Figure l is the embodiment sketch map according to signal transmission between certain transmitter and receiver of a kind of method for transmitting robust wireless multi-media broadcast signal of the present invention.
Fig. 2 is the embodiment sketch map that forms according to signal frame in the signals transmission between certain transmitter and receiver of a kind of method for transmitting robust wireless multi-media broadcast signal of the present invention.
Fig. 3 is the embodiment sketch map 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 method for transmitting robust wireless multi-media broadcast signal of the present invention.
Embodiment
To combine accompanying drawing that specific embodiment of the present invention is described in detail below.
Embodiment according to signal transmission between certain transmitter and receiver of a kind of method for transmitting robust wireless multi-media broadcast signal of the present invention; As scheme shown in the l, 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 data bit Bose-Chaudhuri-Hocquenghem Code (the BoseChaudhuri Hocquenghem that flows through; BCH), Bit Interleave (data bit of radio multimedium broadcast transmitter end flow through behind the Bose-Chaudhuri-Hocquenghem Code Bit Interleave adopt the random interleaving mode), LDPC (the Low DensityParity Check that encodes; LDPC) (flow through code element behind Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, the LDPC coding of the data bit of radio multimedium broadcast transmitter end is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM in (data bit of radio multimedium broadcast transmitter end flow through the encoding rate of the LDPC coding behind Bose-Chaudhuri-Hocquenghem Code, the Bit Interleave be in 1/4,1/2,5/8,3/4 and 7/8), code element modulation; The mapping of symbol constellations figure mapping mode employing Gray code), (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 adopt 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 the l/8 of the cascade interweaved coding modulation data block length of FFT K size; When X got 2048, corresponding C got the l/16 of the cascade interweaved coding modulation data block length of FFT K size) embed the cascade interweaved coding modulation data piece of training sequence (frame) as protection interval (frame head) insertion time domain, 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 is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel;
10) this certain receiver end receives and handles the signal that radio multimedium broadcast transmitter end is sent.
According to the embodiment that signal frame in the signals transmission between certain transmitter and receiver of a kind of method for transmitting robust wireless multi-media broadcast signal of the present invention forms, as shown in Figure 2, practical implementation is following:
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 data bit Bose-Chaudhuri-Hocquenghem Code (the BoseChaudhuri Hocquenghem that flows through; BCH), Bit 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 made up of a series of l or l, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.The training sequence that satisfies above-mentioned characteristic 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 certain each different service index series of 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 is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel.
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 method for transmitting robust wireless multi-media broadcast signal of the present invention, the modulation of 16QAM code element embodiment; As shown in Figure 3, the QPSK code element modulation of this certain radio multimedium broadcast transmitter end, the symbol constellations figure mapping mode of 16QAM code element modulation adopt 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.
Combine accompanying drawing that specific embodiment of the present invention is specified 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 (5)
1. method for transmitting robust wireless multi-media broadcast signal 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 and flow through and further on frequency domain, form the cascade interweaved coding modulation data piece of FFT after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, constellation rotation, the symbol interleave; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM, the 256QAM; The symbol constellations figure mapping mode of code element modulation 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, and 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; BCH representes that Bose-Chaudhuri-Hocquenghem is a BCH Bose-Chadhuri-Hocquengham; LDPC representes that LowDensity Parity Check is a low-density checksum, and FFT representes the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) radio multimedium broadcast transmitter end adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the discrete cascade interweaving encoding modulating data sample value piece of time domain, and IFFT representes the fast discrete Fourier inverse transformation;
4) 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, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X;
5) radio multimedium broadcast transmitter end will repeat 4 times continuously and form time domain embedding training sequence discrete sample block on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, and the length that time domain embeds training sequence discrete sample block is 4 * X;
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 is that the cascade interweaved coding modulation data piece of frame head insertion time domain embedding training sequence is a frame with Cyclic Prefix as protection at interval, and to form signal frame, the length of Cyclic Prefix is C;
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 is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel;
10) receiver end receives and handles the signal that radio multimedium broadcast transmitter end is sent.
2. by a kind of method for transmitting robust wireless multi-media broadcast signal of claim 1, it is characterized in that: the Bit Interleave that the data bit of said radio multimedium broadcast transmitter end is flowed through behind the Bose-Chaudhuri-Hocquenghem Code adopts the random interleaving mode.
3. by a kind of method for transmitting robust wireless multi-media broadcast signal of claim 1, it is characterized in that: the flow through encoding rate of the LDPC coding behind Bose-Chaudhuri-Hocquenghem Code, the Bit Interleave of the data bit of said radio multimedium broadcast transmitter end is in 1/4,1/2,5/8,3/4 and 7/8.
4. by a kind of method for transmitting robust wireless multi-media broadcast signal of claim 1, it is characterized in that: said symbol interleave adopts the random interleaving mode.
5. press a kind of method for transmitting robust wireless multi-media broadcast signal of claim 1; It is characterized in that: training sequence, the operational indicator sequence of said radio multimedium broadcast transmitter end have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.
Priority Applications (1)
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| CN102291358B (en) * | 2011-08-22 | 2013-08-21 | 宁波大学 | Robust multi-media mobile broadcast signal framing modulation method |
| CN102255860B (en) * | 2011-08-22 | 2013-09-25 | 宁波大学 | Anti-interference digital mobile broadcasting signal transmission method |
| CN102255861B (en) * | 2011-08-22 | 2013-09-25 | 宁波大学 | Robust digital mobile broadcast signal transmitting method |
| CN102281245B (en) * | 2011-08-22 | 2013-08-07 | 宁波大学 | Single frequency network robustness wireless digital broadcast signal transmission method |
| CN102263742B (en) * | 2011-08-22 | 2013-12-11 | 宁波大学 | Robust framing modulation method for mobile multi-media broadcast signals of single frequency network |
| CN102299887B (en) * | 2011-08-22 | 2013-09-25 | 宁波大学 | Multimedia broadcasting wireless signal robust framing modulation method |
| CN102255849B (en) * | 2011-08-22 | 2013-08-07 | 宁波大学 | Robust method for framing and modulating wireless multimedia broadcast signal |
| CN102281240B (en) * | 2011-08-22 | 2014-03-26 | 宁波大学 | Anti-noise multimedia mobile broadcast signal framing modulation method |
| CN102281230B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Multimedia broadcast mobile signal robust framing modulation method |
| CN102281233B (en) * | 2011-08-22 | 2013-08-21 | 宁波大学 | Multimedia broadcast mobile signal framing modulation method |
| CN102271112B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Framing modulating method for robust mobile multimedia broadcast signal |
| CN102281234B (en) * | 2011-08-22 | 2013-08-21 | 宁波大学 | Multimedia broadcast mobile signal anti-fading framing modulation method |
| CN103763253A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Framing modulation method for robust multi-media mobile broadcast signals |
| CN105979290A (en) * | 2016-05-11 | 2016-09-28 | 张学军 | COFDM high-speed wireless image transmitter |
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| CN101394392A (en) * | 2008-11-12 | 2009-03-25 | 北京邮电大学 | Signal diversifying method for OFDM system |
| CN101420409A (en) * | 2008-10-27 | 2009-04-29 | 宁波大学 | Interference resistant modulation method for digital television terrestrial broadcast transmitter |
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| CN101394392A (en) * | 2008-11-12 | 2009-03-25 | 北京邮电大学 | Signal diversifying method for OFDM system |
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