CN101383808A - Digital television ground broadcast transmitter modulation method based on embedded training sequence and BICM - Google Patents
Digital television ground broadcast transmitter modulation method based on embedded training sequence and BICM Download PDFInfo
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Abstract
The invention discloses a modulation method of a digital television terrestrial broadcast transmitter based on an embedded training sequence and BICM. The modulation method comprises the following steps: (1) an input bit stream carries out multi-rate punctured convolutional coding, bit interleaving and code element modulation to form an FFT bit interleaving code modulation data block on a frequency domain; (2) the data block is converted into a time domain discrete bit interleaving code modulation data block by IFFT; (3) the training sequence is used as a real part sequence and a service index sequence is used as an imaginary-part sequence so as to form a discrete sample block of a complex training sequence; (4) the complex training sequence is continuously repeated for 4 times so as to form a time domain embedded training sequence discrete sample block; (5) the time domain discrete bit interleaving code modulation data block and the time domain embedded training sequence discrete sample block are superposed to form a time domain embedded training sequence bit interleaving code modulation data block; (6) a cyclic prefix is inserted to form a signal frame; (7) a square root raised consine roll-off filter is used to carry out pulse shaping to the signal frame; and (8) a baseband is carried out up-variation frequency to a carrier wave.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of based on the digital television ground broadcast transmitter modulation method that embeds training sequence and BICM (Bit Interleave coded modulation, Bit Interleaved Coded Modulation).
Background technology
At present, ground TV broadcast develops to the digitlization direction gradually from simulation.Digital television ground broadcast transmission system, as the important component part of Digital Television Terrestrial 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 Terrestrial 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 the Digital Television Terrestrial Broadcasting correlation technique, the emphasis of various countries' concern at present is that the Digital Television Terrestrial Broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.The digital television ground broadcast transmitter modulation technique is the key technology of digital tv ground broadcasting, 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 Terrestrial 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.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 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 digital television ground broadcast 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 ground broadcast transmission system of new generation satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of digital television ground broadcast transmitter modulation method, can satisfy the needs of High Data Rate may command multi-service Digital Television Terrestrial Broadcasting transmission based on embedding training sequence and BICM.
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?mobilechannel?using?orthogonal?frequency?division?multiplexing，”IEEETrans.Commun.，vol.COM-33，pp.665-675，July?1985.
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimediacommunications”.Boston：Artech?House，2000.
A.R.S.Bahai?and?B.R.Saltzberg.“Multi-Carrier?DigitalCommunications：Theory?and?Applications?of?OFDM”.KluwerAcademic/Plenum，1999.
Y.Wu，S.Hirakawa，U.H.Reimers，andJ.Whitaker.“Overviewof?digital?television?development，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?andEmerging?Services，pp.8-21，Jan.2006.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?codedmodulation，”IEEE?Trans.Information?Theory，vol.44，no.3，pp.927-946，May?1998.
X.Li，A.Chindapol?and?J.A.Ritchey，“Bit-interleaved?codedmodulation?with?iterative?decoding?and?8?PSK?signaling，”IEEETrans.Commun.，vol.50，pp.1250-1257，2002.
J.Hagenauer，“Rate-compatible?punctured?convolutional?codesand?their?appl?ications，”IEEE?Trans.Commun.，vol.36，no.4，pp.389-400，April?1988.
X.Li?and?J.A.Ritcey，“Bit-interleaved?coded?modulation?wiLhiterative?decoding，”IEEE?Commun.Lett.，vol.1，pp.169-171，Nov.1997.
A.Chindapol?and?J.A.Ritcey，“Design，analysis，andperformance?evaluation?for?BICM-ID?with?square?QAMconstellations?in?Rayleigh?fading?channels，”IEEE?J.Select.Areas?Commun.，vol.19，no.5，pp.944-957，May?2001.
U.Wachsmann，R.Fischer，and?J.Huber，“Multilevel?codes：theoretical?concepts?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，and?iterative?decoding，”IEEE?Trans.Inform.Theory，vol.44，no.3，pp.909-925，May?1998.
Summary of the invention
The present invention is directed to High Data Rate Digital Television Terrestrial Broadcasting problem, proposed a kind of based on the digital television ground broadcast transmitter modulation method that embeds training sequence and BICM (Bit Interleave coded modulation, Bit Interleaved Coded Modulation).
What the present invention proposed is a kind of based on the digital television ground broadcast transmitter modulation method that embeds training sequence and BICM, it is characterized in that it comprises the following steps:
1) digital television ground broadcast transmitter is flowed through the input data bit of oneself and is further formed 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 on frequency domain;
2) digital television ground broadcast transmitter 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;
3) digital television ground broadcast transmitter 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;
4) digital television ground broadcast transmitter 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;
5) digital television ground broadcast transmitter 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;
6) digital television ground broadcast transmitter 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;
7) digital television ground broadcast transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
8) digital television ground broadcast transmitter with the baseband signal up-conversion to carrier wave.
The digital television ground broadcast transmitter modulation method based on embedding training sequence and LDPC coding according to above-mentioned is characterized in that: have periodic time domain in the signal frame of digital television ground broadcast transmitter and embed training sequence discrete sample block; The length K of the training sequence of digital television ground broadcast transmitter 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 digital television ground broadcast transmitter, 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; The different operational indicator sequence of each of digital television ground broadcast transmitter is comprising and unique each system parameters and business model information of expressing digital television ground broadcast transmitter; The input data are carried out multi code Rate of Chinese character, and to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8 one; Bit Interleave adopts the random interleaving mode; Code element is modulated to a kind of among QPSK, 16QAM, 32QAM and the 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
Characteristics of the present invention:
The present invention is the modulation scheme that a kind of time-domain and frequency-domain mixes.Have periodic time domain in the signal frame of digital television ground broadcast transmitter and embed training sequence discrete sample block, the training sequence of digital television ground broadcast transmitter, the operational indicator sequence has pseudo-random characteristics, the training sequence of digital television ground broadcast transmitter, the operational indicator sequence has orthogonality each other, the time domain embedding training sequence bit interweaving encoding modulated data blocks of digital television ground broadcast transmitter is the discrete bits 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 digital television ground broadcast transmitter 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.Cyclic Prefix is inserted time domain at interval as protection embed training sequence bit interweaving encoding modulated data blocks, can reduce the interference effect between the adjacent signals frame to form signal frame.Adopt BICM that the input data are carried out the Bit Interleave coded modulation and improved diversity order, make communication system under multidiameter fading channel, have good bit error performance.The different operational indicator sequence of each of digital television ground broadcast transmitter is comprising and unique each system parameters and business model information of expressing digital television ground broadcast transmitter, digital television ground 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.Modulator approach of the present invention have lock in time short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide plurality of advantages such as High Data Rate may command multi-service Digital Television Terrestrial Broadcasting transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to certain transmitter based on the digital television ground broadcast transmitter modulation method that embeds training sequence and BICM of the present invention.
Fig. 2 is the embodiment schematic diagram that forms signal frame based on certain transmitter of the digital television ground broadcast transmitter modulation method that embeds training sequence and BICM according to of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
The embodiment based on certain transmitter of the digital television ground broadcast transmitter modulation method that embeds training sequence and BICM according to the present invention proposes as shown in Figure 1, follows these steps to carry out:
1) this certain digital television ground broadcast transmitter is deleted the input data bit of oneself multi code Rate of Chinese character of flowing through further to form FFT Bit Interleave coding modulation data piece after surplus convolutional encoding, Bit Interleave, the code element modulation on frequency domain (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);
2) this certain digital television ground broadcast transmitter 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;
3) this certain digital television ground broadcast transmitter 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;
4) this certain digital television ground broadcast transmitter 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;
5) this certain digital television ground broadcast transmitter 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;
6) (length of Cyclic Prefix is C to this certain digital television ground broadcast transmitter 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;
7) this certain digital television ground broadcast transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
8) this certain digital television ground broadcast transmitter with the baseband signal up-conversion to carrier wave.
Form the embodiment of signal frame according to of the present invention based on certain transmitter of the digital television ground broadcast transmitter modulation method that embeds training sequence and BICM, as shown in Figure 2, specifically implement as follows:
This certain digital television ground broadcast transmitter is flowed through the input data bit of oneself and is further formed FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation on frequency domain, through IFFT it is transformed to the discrete bits interweaving encoding modulating data sample value piece of time domain again.
FFT Bit Interleave coding modulation data piece 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 digital television ground broadcast transmitter 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 training sequence, operational indicator sequence, sequence of plural training all is X, and X gets in 512,1024,2048, and the length that time domain embeds training sequence discrete sample block is K, K=4 * X.
Training sequence, operational indicator sequence as digital television ground 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.
Each different operational indicator sequence is comprising and unique each system parameters and business model information of expressing digital television ground broadcast transmitter.
This certain digital television ground broadcast transmitter 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.
Length as protection Cyclic Prefix at interval 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 digital television ground broadcast transmitter 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.
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 (8)
1, a kind of based on the digital television ground broadcast transmitter modulation method that embeds training sequence and BICM, it is characterized in that it comprises the following steps:
1) digital television ground broadcast transmitter is flowed through the input data bit of oneself and is further formed 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 on frequency domain;
2) digital television ground broadcast transmitter 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;
3) digital television ground broadcast transmitter 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;
4) digital television ground broadcast transmitter 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;
5) digital television ground broadcast transmitter 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;
6) digital television ground broadcast transmitter 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;
7) digital television ground broadcast transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
8) digital television ground broadcast transmitter with the baseband signal up-conversion to carrier wave
2, by the digital television ground broadcast transmitter modulation method based on embedding training sequence and BICM of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described digital television ground broadcast transmitter, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3, press the digital television ground broadcast transmitter modulation method based on embedding training sequence and BICM of claim 2, it is characterized in that: described training sequence, operational indicator sequence have pseudo-random characteristics, and described training sequence, operational indicator sequence have orthogonality each other.
4, by the digital television ground broadcast transmitter modulation method based on embedding training sequence and BICM of claim 1, it is characterized in that: described FFT Bit Interleave coding modulation data piece 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.
5, by the digital television ground broadcast transmitter modulation method based on embedding training sequence and BICM of claim 4, 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.
6, by the digital television ground broadcast transmitter modulation method based on embedding training sequence and BICM of claim 1, it is characterized in that: described signal frame is inserted into time domain embedding training sequence bit interweaving encoding modulated data blocks by Cyclic Prefix and forms.
7, by the digital television ground broadcast transmitter modulation method based on embedding training sequence and BICM of claim 1, it is characterized in that: the length of described Cyclic Prefix 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.
8, press the digital television ground broadcast transmitter modulation method based on embedding training sequence and BICM of claim 1, it is characterized in that: describedly the input data are carried out multi code Rate of Chinese character delete the multi code Rate of Chinese character of surplus convolutional encoding, Bit Interleave, code element modulation treatment to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8 one, Bit Interleave adopts the random interleaving mode, code element is modulated to a kind of among QPSK, 16 QAM, 32 QAM and 64 QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778078A (en) * | 2010-03-03 | 2010-07-14 | 宁波大学 | Anti-jamming wireless multimedia broadcasting signal transmission method |
| CN102271116A (en) * | 2011-08-22 | 2011-12-07 | 宁波大学 | Anti-fading multimedia wireless broadcast signal framing modulation method |
| CN102281240A (en) * | 2011-08-22 | 2011-12-14 | 宁波大学 | Anti-noise multimedia mobile broadcast signal framing modulation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1317903A (en) * | 2001-04-27 | 2001-10-17 | 清华大学 | Time domain synchronized orthogonal frequency-division complex modulation method |
| GB2424805B (en) * | 2005-03-30 | 2007-02-28 | Toshiba Res Europ Ltd | Efficient channel tracking in packet based OFDM systems |
| CN1980210B (en) * | 2005-12-08 | 2010-11-10 | 北京邮电大学 | Method for realizing sign blind synchronization in zero-prefix orthogonal frequency-division multiplexing system |
| CN101141168A (en) * | 2007-10-18 | 2008-03-12 | 郑紫微 | Orthogonal time-domain training sequence based multi-user MIMO-OFDM modulation method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101778078A (en) * | 2010-03-03 | 2010-07-14 | 宁波大学 | Anti-jamming wireless multimedia broadcasting signal transmission method |
| CN101778078B (en) * | 2010-03-03 | 2012-10-03 | 宁波大学 | Anti-jamming wireless multimedia broadcasting signal transmission method |
| CN102271116A (en) * | 2011-08-22 | 2011-12-07 | 宁波大学 | Anti-fading multimedia wireless broadcast signal framing modulation method |
| CN102281240A (en) * | 2011-08-22 | 2011-12-14 | 宁波大学 | Anti-noise multimedia mobile broadcast signal framing modulation method |
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