CN101778078B - Anti-jamming wireless multimedia broadcasting signal transmission method - Google Patents
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- CN101778078B CN101778078B CN 201010116834 CN201010116834A CN101778078B CN 101778078 B CN101778078 B CN 101778078B CN 201010116834 CN201010116834 CN 201010116834 CN 201010116834 A CN201010116834 A CN 201010116834A CN 101778078 B CN101778078 B CN 101778078B
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Abstract
The invention discloses an anti-jamming 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, bit stream multi-code rate punctured convolution code, bit interlacement, code element modulation, constellation rotation, 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, environment interference resistance, controlled multi-service and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-jamming wireless multimedia broadcasting signal transmission method.
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.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.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 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.BICM technology (Bit Interleave coded modulation; Bit Interleaved Coded Modulation; BICM) adopt bit interleaver and feasible coding and modulated process relatively independent; Thereby make and to expand diversity order to different binary bits number from different multi-system symbolic numbers, that is to say that its diversity order L is the smallest hamming distance between the binary code word sequence.Because the BICM technology makes diversity order be improved significantly, therefore, make communication system under multidiameter fading channel, have good bit error performance.
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 anti-jamming wireless multimedia broadcasting signal transmission method, can be effectively anti-interference and satisfy the needs of High Data Rate may command multi-service DTV radio transmission.
Desire is done more deep understanding to the patent background can be with reference to following documents and materials:
L.J.Cimini，“Analysis?and?simulation?of?a?digital?mobile?channel?usingorthogonal?frequency?division?multiplexing，”IEEE?Trans.Commun.，vol.COM-33，pp.665-675，July?1985.
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimedia?communications”.Boston：Artech?House，2000.
A.R.S.Bahai?and?B.R.Saltzberg.“Multi-Carrier?Digital?Communications：Theory?and?Applications?of?OFDM”.Kluwer?Academic/Plenum，1999.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digitaltelevision?development，”Proceedings?of?the?IEEE，Special?Issue?on?GlobalDigital?Television：Technology?and?Emerging?Services，pp.8-21，Jan.2006.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?coded?modulation，”IEEE?Trans.Information?Theory，vol.44，no.3，pp.927-946，May?1998.
X.Li，A.Chindapol?and?J.A.Ritchey，“Bit-interleaved?coded?modulationwith?iterative?decoding?and?8PSK?signaling，”IEEE?Trans.Commun.，vol.50，pp.1250-1257，2002.
J.Hagenauer，“Rate-compatible?punctured?convolutional?codes?and?theirapplications，”IEEE?Trans.Commun.，vol.36，no.4，pp.389-400，April1988.
X.Li?and?J.A.Ritcey，“Bit-interleaved?coded?modulation?with?iterativedecoding，”IEEE?Commun.Lett.，vol.1，pp.169-171，Nov.1997.
A.Chindapol?and?J.A.Ritcey，“Design，analysis，and?performanceevaluation?for?BICM-ID?with?square?QAM?constellations?in?Rayleigh?fadingchannels，”IEEE?J.Select.Areas?Commun.，vol.19，no.5，pp.944-957，May?2001.
U.Wachsmann，R.Fischer，and?J.Huber，“Multilevel?codes：theoreticalconcepts?and?practical?design?rules，”IEEE?Trans.Inform.Theory，vol.45，no.5，pp.1361-1391，July?1999.
S.Benedetto，D.Divsalar，G.Montorsi，and?F.Pollara，“Serialconcatenation?of?interleaved?codes：performance?analysis，design，anditerative?decoding，”IEEE?Trans.Inform.Theory，vol.44，no.3，pp.909-925，May?1998.
X.Giraud，E.Boutillon，J.C.Belfiore.“Algebraic?tools?to?buildmodulation?schemes?for?fading?channels，”IEEE?Trans.Commun.，vol.43，pp.938-952，May.1997.
J.Boutros，E.Viterbo.“Signal?space?diversity：A?power-andbandwidth-efficient?diversity?technique?for?the?Rayleigh?fadingchannel，”IEEE?Trans.Inform.Theory，vol.44，pp.1453-1467，July.1998.
Summary of the invention
The present invention is directed to High Data Rate DTV radio transmission problem, proposed a kind of anti-jamming wireless multimedia broadcasting signal transmission method.
A kind of anti-jamming 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 data bit and flow through and further on frequency domain, form FFT Bit Interleave coding modulation data piece (length (symbol numbers) of FFT Bit Interleave coding modulation data piece is K) after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation, constellation rotation;
3) radio multimedium broadcast transmitter end adopts IFFT (fast discrete Fourier inverse transformation) FFT Bit Interleave coding modulation data piece to be transformed to the discrete bits 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 bits interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed training sequence bit interweaving encoding modulated data blocks, 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 training sequence bit interweaving encoding modulated data blocks (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 anti-jamming 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 multi code Rate of Chinese character to the input data bit flow, and to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8; The data bit of the radio multimedium broadcast transmitter end Bit Interleave that multi code Rate of Chinese character deletes after the surplus convolutional encoding of flowing through adopts the random interleaving mode; The data bit of the radio multimedium broadcast transmitter end multi code Rate of Chinese character of flowing through is deleted code element behind surplus convolutional encoding, the Bit Interleave and is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode 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, 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; 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 corresponding FFT Bit Interleave coding modulation data piece 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 FFT Bit Interleave coding modulation data block length 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; Training sequence, the operational indicator sequence of radio multimedium broadcast transmitter end 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 anti-interference transmission plan of signal diversifying 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 bits 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 training sequence bit interweaving encoding modulated data blocks, and these have guaranteed that radio multimedium broadcasting emitter/receiver 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 training sequence bit interweaving encoding modulated data blocks to form signal frame, can reduce the interference effect between the adjacent signals frame.Radio multimedium broadcast transmitter end adopts Bit Interleave coded modulation and constellation rotation processing to improve diversity order to the input data bit flow, makes communication system under the interference environment background, have good bit error performance.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 anti-jamming wireless multimedia broadcasting signal transmission method of the present invention have receiver lock in time short, clock jitter is little, anti-interference environmental background, plurality of advantages such as High Data Rate may command multi-service DTV radio broadcasting signal transmission can be provided.
Description of drawings
Fig. 1 is the embodiment sketch map according to signal transmission between certain transmitter and receiver of a kind of anti-jamming wireless multimedia broadcasting signal transmission method 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 anti-jamming wireless multimedia broadcasting signal transmission method 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 anti-jamming wireless multimedia broadcasting signal transmission method 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 anti-jamming 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 multi code Rate of Chinese character of flowing through and delete surplus convolutional encoding (radio multimedium broadcast transmitter end carries out multi code Rate of Chinese character to the input data bit flow, and to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8), Bit Interleave (data bit of radio multimedium broadcast transmitter end flow through the Bit Interleave that multi code Rate of Chinese character deletes after the surplus convolutional encoding adopt the random interleaving mode), code element modulation (data bit of the radio multimedium broadcast transmitter end multi code Rate of Chinese character of flowing through is deleted code element behind surplus convolutional encoding, the Bit Interleave and is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM; 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) after further on frequency domain, form FFT Bit Interleave coding modulation data piece (length (symbol numbers) of FFT Bit Interleave coding modulation data piece be K; When X got 512, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece 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) FFT Bit Interleave coding modulation data piece to be transformed to the discrete bits 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 bits interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed training sequence bit interweaving encoding modulated data blocks, 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 FFT Bit Interleave coding modulation data block length K size; When X got 1024, corresponding C got 1/8 of FFT Bit Interleave coding modulation data block length K size; When X gets 2048, corresponding C get FFT Bit Interleave coding modulation data block length K size 1/16) as protection at interval (frame head) insert time domain and embed training sequence bit interweaving encoding modulated data blocks (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 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 anti-jamming wireless multimedia broadcasting signal transmission method 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 and flow through and further on frequency domain, form FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation, constellation rotation, through IFFT it will be transformed to the discrete bits interweaving encoding modulating data sample value piece of time domain again.
The FFT Bit Interleave coding modulation data piece of this certain radio multimedium broadcast transmitter end is made up of subcarrier.The length (symbol numbers) of FFT Bit Interleave coding modulation data piece is K; When X got 512, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece 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 end 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 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.
Each different service index series of this 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 bits interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed training sequence bit interweaving encoding modulated data blocks, as frame; In time domain embedding training sequence bit interweaving encoding modulated data blocks, insert Cyclic Prefix at interval, form signal frame as protection.
The length of the conduct protection Cyclic Prefix at interval of this certain radio multimedium broadcast transmitter end is C; When X got 512, corresponding C got 1/4 of FFT Bit Interleave coding modulation data block length K size; When X got 1024, corresponding C got 1/8 of FFT Bit Interleave coding modulation data block length K size; When X got 2048, corresponding C got 1/16 of FFT Bit Interleave coding modulation data block length 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 anti-jamming wireless multimedia broadcasting signal transmission method 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 (4)
1. anti-jamming 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 and flow through and further on frequency domain, form FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation, constellation rotation; 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; FFT representes the fast discrete Fourier conversion, and the length of FFT Bit Interleave coding modulation data piece is K;
3) radio multimedium broadcast transmitter end adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to the discrete bits 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 bits interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed training sequence bit interweaving encoding modulated data blocks, as frame;
7) radio multimedium broadcast transmitter end is that frame head insertion time domain embedding training sequence bit interweaving encoding modulated data blocks 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 anti-jamming wireless multimedia broadcasting signal transmission method of claim 1, it is characterized in that: said radio multimedium broadcast transmitter end carries out multi code Rate of Chinese character to the input data bit flow, and to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8.
3. by a kind of anti-jamming wireless multimedia broadcasting signal transmission method of claim 1, it is characterized in that: the data bit of the said radio multimedium broadcast transmitter end Bit Interleave that multi code Rate of Chinese character deletes after the surplus convolutional encoding of flowing through adopts the random interleaving mode.
4. press a kind of anti-jamming wireless multimedia broadcasting signal transmission method 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.
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| CN102281239B (en) * | 2011-08-22 | 2014-03-26 | 宁波大学 | Anti-interference multimedia mobile broadcast signal framing modulation method |
| CN102281240B (en) * | 2011-08-22 | 2014-03-26 | 宁波大学 | Anti-noise multimedia 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 |
| CN102281241B (en) * | 2011-08-22 | 2014-03-26 | 宁波大学 | Multimedia mobile broadcast signal framing modulation method |
| CN102281235B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Anti-interference method for modulating mobile multimedia broadcast signal by framing |
| CN102281231B (en) * | 2011-08-22 | 2013-08-21 | 宁波大学 | Multimedia broadcast mobile signal anti-interference framing modulation method |
| CN102281237B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Mobile multimedia broadcast signal framing modulation method |
| CN102281244B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Anti-interference wireless digital broadcast signal transmission method for single frequency network |
| 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 |
| CN102263738B (en) * | 2011-08-22 | 2013-08-07 | 宁波大学 | Anti-interference transmission method for digital broadcast wireless signal |
| CN103763256A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Framing modulation method for multimedia movable broadcast signals |
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| CN101383808A (en) * | 2008-10-27 | 2009-03-11 | 宁波大学 | Digital television ground broadcast transmitter modulation method based on embedded training sequence and BICM |
| CN101394392A (en) * | 2008-11-12 | 2009-03-25 | 北京邮电大学 | Signal diversifying method for OFDM system |
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| CN101778078A (en) | 2010-07-14 |
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