CN101431501B - Modulation method for high-performance digital television ground broadcasting transmitter - Google Patents
Modulation method for high-performance digital television ground broadcasting transmitter Download PDFInfo
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- CN101431501B CN101431501B CN2008102282806A CN200810228280A CN101431501B CN 101431501 B CN101431501 B CN 101431501B CN 2008102282806 A CN2008102282806 A CN 2008102282806A CN 200810228280 A CN200810228280 A CN 200810228280A CN 101431501 B CN101431501 B CN 101431501B
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Abstract
The invention discloses a modulation method for digital TV terrestrial broadcasting transmitter with time domain training sequence and cascade interleaved coded modulation comprising: 1) bit stream forming FFT data block on frequency domain after BCH coding, bit interleaving, LDPC coding, code element modulation, code element interleaving; 2) converting FFT data block to time domain discreet data sample value block via IFFT; 3) inserting cyclic prefix as protective interval to time domain discrete coding data sample block and forming time domain cyclic prefix discrete coding data sample block; 4) continuous four time domain cyclic prefix discrete coding data sample value block constituting a frame body; 5) training sequence serving as real part sequence of plural training sequence, service index sequence serving as imaginary part sequence to constitute discrete sample value block of plural training sequence; 6) inserting the discrete sample value block of plural training sequence in signal frame for forming frame body; 7) pulse shaping to signal frame using square root raised consine roll-off filter; 8) up-converting base band to carrier.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of have time-domain training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method.
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.
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 cascade optimal design of modulation scheme reaches big as far as possible signal diversifying exponent number, so that in equaling or exceeding the symbol sebolic addressing of minimum free distance, obtain independent decline.The different coding form of cascade can make full use of the advantage of different coding technology; Between coding and code element modulation, insert bit interleaver, can be so that coding be relatively independent with modulated process and expand diversity order to different binary bits number from different multi-system symbolic numbers, thus make diversity order be improved significantly and under multidiameter fading channel, have the bit error performance of getting well.
In the practical communication environment, the Digital Television Terrestrial Broadcasting communication system performance is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Transmitter modulation method is the key technology that realizes the reliable digit television terrestrial broadcasting.
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 have time-domain training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method, can satisfy the needs of High Data Rate may command multi-service Digital Television Terrestrial Broadcasting transmission.
Desire is done more deep understanding to the patent background can be with reference to following documents and materials:
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R.V.Nee，R.Prasad.“OFDM?for?wirelessmul?timediacommunications”.Boston：ArtechHouse，2000.
A.R.S.Bahai?and?B.R.Saltzberg.“Multi-CarrierDigitalCommunica?tions：Theory?and?Applications?of?OFDM”.KluwerAcademic/Pl?enum，1999.
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R.C.Bose?and?D.K.Ray-Chadhuri，“On?a?class?of?error?correctingbinary?group?codes，”Inform.Con?tr.，vol.3，pp.68-79，Mar.1960.
R.C.Bose?and?D.K.Ray-Chadhuri，“Further?results?on?errorcorrecting?binary?group?codes，”Inform.Contr.，vo?l.3，pp.279-290，Sept.1960.
R.Berlekamp，“0n?decoding?binary?Bose-Chaudhuri-Hocquenghemcodes，”IEEE.Trans.Inform.Theory，vol.IT-11，pp.580-585，Oct.1965.
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R.G.Gallager，“Low-density?parity-check?codes，”IRE?Trans.Inf.Theory，vol.IT-8，no.1，pp.21-28，Jan.1962.
D.J.C.MacKay，“Good?error-correcting?codes?based?on?verysparse?matrices，”IEEE?Trans.Inf.Theory，vol.45，no.2，pp.399-431，Mar.1999.
D.J.C.MacKay，S.T.Wilson，and?M.C.Davey，“Comparison?ofconstructions?of?irregular?Gallager?codes，”IEEE?Trans.Commun.，vol.47，no.10，pp.1449-1454，Oct.1999.
D.J.C.MacKay?and?R.M.Neal，“Near?Shannonl?imit?performanceof?low?density?parity?check?codes，”IEE?Electron.Lett.，vol.32，no.18，pp.1645-1646，Aug.1996.
M.P.C.Fossorier，“Quasi-cyclic?low?density?parity?check?codesfrom?circulant?permutation?matrices，”IEEE?Trans.Inform.Theory，vol.50，pp.1788-1794，Aug.2004.
T.Richardson，A.Shokrollahi，and?R.Urbanke，“Design?ofcapacity?approaching?low?density?parity?check?codes，”IEEE?Trans.Inf.Theory，vol.47，no.2，pp.619-637，Feb.2001.
E.Zehavi，“8-PSKtrellis?codes?for?a?rayleigh?channel，”IEEETrans.Commun.，vo?l.40，no.5，pp.873-884，May1992.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?codedmodulation，”IEEETrans.Informa?tion?Theory，vol.44，no.3，pp.927-946，May1998.
X.Li，A.Chindapol?and?J.A.Ri?tchey，“Bit-interleaved?codedmodulation?with?iterative?decoding?and8PSK?signaling，”IEEETrans.Commun.，vol.50，pp.1250-1257，2002.
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Summary of the invention
The present invention is directed to High Data Rate may command multi-service Digital Television Terrestrial Broadcasting and proposed a kind of have time-domain training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method.
The present invention proposes a kind ofly has time-domain training sequence and a cascade interweaved code modulated digital television ground broadcast transmitter modulation method, it is characterized in that it comprises the following steps:
1) digital television ground broadcast transmitter is with the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code (the BoseChaudhuri Hocquenghem 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, symbol interleave;
2) digital television ground broadcast transmitter 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;
3) digital television ground broadcast transmitter as protecting the discrete cascade interweaving encoding modulating data sample value piece that is inserted into time domain at interval, forms the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix (length of the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix is (K+C)) with Cyclic Prefix (length of Cyclic Prefix is C);
4) digital television ground broadcast transmitter forms frame (length of frame is L, L=4 * (K+C)) with the discrete cascade interweaving encoding modulating data sample value piece of 4 continuous time domain cyclic prefix;
5) 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;
6) digital television ground broadcast transmitter is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain, 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.
Have time-domain training sequence and a cascade interweaved code modulated digital television ground broadcast transmitter modulation method according to above-mentioned, it is characterized in that: have time domain sequence of plural training discrete sample block in the signal frame of digital television ground broadcast transmitter; The length of the training sequence of digital television ground broadcast transmitter (symbol numbers) X is 512, length (symbol numbers) K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT is 1024, the frequency interval of corresponding subcarrier is respectively 8KHz, and corresponding circulating prefix-length C is 1/16 of the cascade interweaved coding modulation data block length of a FFT 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 encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; 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; Symbol interleave adopts the random interleaving mode.
Characteristics of the present invention:
The present invention is the modulation scheme that a kind of time-domain and frequency-domain mixes.Has time domain sequence of plural training discrete sample block in the signal frame of digital television ground broadcast transmitter, 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, digital television ground broadcast transmitter is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain and forms signal frame, 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.The discrete cascade interweaving encoding modulating data sample value piece that Cyclic Prefix is inserted at interval time domain as protection can reduce time domain sequence of plural training discrete sample block, the discrete cascade interweaving encoding modulating data sample value piece interference effect each other of adjacent time domain cyclic prefix to form the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix.The discrete cascade interweaving encoding modulating data sample value piece of 4 continuous time domain cyclic prefix is formed the efficient that frame can improve digital tv ground broadcasting.The input data are carried out cascade interweaved coded modulation 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 that has certain transmitter of time-domain training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method according to of the present invention.
Fig. 2 is the embodiment schematic diagram that forms signal frame according to certain transmitter with time-domain training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
The embodiment of certain transmitter with time-domain training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method that proposes according to the present invention as shown in Figure 1, follows these steps to carry out:
1) digital television ground broadcast transmitter is flowed through the input data bit of oneself and is further formed the cascade interweaved coding modulation data piece of FFT after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, the symbol interleave on frequency domain (length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K, K gets 1024, and the frequency interval of corresponding subcarrier is got 8KHz);
2) digital television ground broadcast transmitter 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;
3) digital television ground broadcast transmitter is inserted into Cyclic Prefix (length of Cyclic Prefix is C) as protection the discrete cascade interweaving encoding modulating data sample value piece of time domain at interval, form the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix (length of the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix is (K+C), C get the cascade interweaved coding modulation data block length of FFT K size 1/16);
4) digital television ground broadcast transmitter forms frame (length of frame is L, L=4 * (K+C)) with the discrete cascade interweaving encoding modulating data sample value piece of 4 continuous time domain cyclic prefix;
5) 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 is X all, and X gets 512) of sequence of plural training;
6) digital television ground broadcast transmitter is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain, 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.
According to the embodiment with certain transmitter formation signal frame of time-domain training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method of the present invention, 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 the cascade interweaved coding modulation data piece of FFT after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, the symbol interleave on frequency domain, 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 FFT is made up of subcarrier.The length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K; The length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT gets 1024, and the frequency interval of corresponding subcarrier is got 8KHz.
This certain digital television ground broadcast transmitter is inserted into Cyclic Prefix (length of Cyclic Prefix is C) as protection the discrete cascade interweaving encoding modulating data sample value piece of time domain at interval; form the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix (length of the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix is (K+C), C get the cascade interweaved coding modulation data block length of FFT K size 1/16).
This certain digital television ground broadcast transmitter forms frame with the discrete cascade interweaving encoding modulating data sample value piece of 4 continuous time domain cyclic prefix, and (length of frame is L, L=4 * (K+C).
This certain 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 of sequence of plural training with training sequence on time domain.
The length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is X all, and X gets 512.
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 is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain, to form signal frame.
This certain digital television ground broadcast transmitter adopts square root raised cosine filter that the signal of signal frame is carried out pulse shaping.The signal of signal frame is carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and get 0.05.
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. one kind has time-domain training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method, 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 the cascade interweaved coding modulation data piece of FFT after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, the symbol interleave on frequency domain, and the length of the cascade interweaved coding modulation data piece of FFT is K;
2) digital television ground broadcast transmitter 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 represents the fast discrete Fourier inverse transformation;
3) digital television ground broadcast transmitter is inserted into Cyclic Prefix as protection the discrete cascade interweaving encoding modulating data sample value piece of time domain at interval, form the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix, the length of Cyclic Prefix is C, and the length of the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix is K+C;
4) digital television ground broadcast transmitter forms frame with the discrete cascade interweaving encoding modulating data sample value piece of 4 continuous time domain cyclic prefix, and the length of frame is L, L=4 * (K+C);
5) 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, constitute the discrete sample block of sequence of plural training on time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X;
6) digital television ground broadcast transmitter is inserted into frame with the discrete sample block of the sequence of plural training that constitutes on the time domain as frame head, 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.
By claim 1 have time-domain training sequence and a cascade interweaved code modulated digital television ground broadcast transmitter modulation method, 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 512.
By claim 2 have time-domain training sequence and a cascade interweaved code modulated digital television ground broadcast transmitter modulation method, it is characterized in that: described training sequence, operational indicator sequence have pseudo-random characteristics.
By claim 2 have time-domain training sequence and a cascade interweaved code modulated digital television ground broadcast transmitter modulation method, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. have time-domain training sequence and a cascade interweaved code modulated digital television ground broadcast transmitter modulation method by claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is made up of subcarrier, the length K of the cascade interweaved coding modulation data piece of FFT is 1024, and the frequency interval of subcarrier is 8KHz.
6. have time-domain training sequence and a cascade interweaved code modulated digital television ground broadcast transmitter modulation method by claim 1, it is characterized in that: described to the input data carry out Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, the LDPC coding, the code element modulation, the encoding rate of the LDPC coding that symbol interleave is handled is 1/4,1/2,5/8, in 3/4 and 7/8 one, Bit Interleave adopts the random interleaving mode, code element is modulated to QPSK, 16 QAM, a kind of among 32 QAM and 64 QAM, symbol constellations figure mapping mode adopts the Gray code mapping, and symbol interleave adopts the random interleaving mode.
7. have time-domain training sequence and a cascade interweaved code modulated digital television ground broadcast transmitter modulation method by claim 1; it is characterized in that: described length as the Cyclic Prefix of protecting the discrete cascade interweaving encoding modulating data sample value piece that is inserted into time domain at interval is C, and C gets 1/16 of K size.
By claim 1 have time-domain training sequence and a cascade interweaved code modulated digital television ground broadcast transmitter modulation method, it is characterized in that: described signal frame is inserted into the discrete cascade interweaving encoding modulating data sample value piece of 4 continuous time domain cyclic prefix by the discrete sample block of the sequence of plural training that constitutes on the time domain as frame head and forms as frame.
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| CN101778075B (en) * | 2010-03-03 | 2011-07-06 | 宁波大学 | Multimedia broadcast wireless signal anti-fading transmission method |
| CN101815051B (en) * | 2010-03-03 | 2011-06-29 | 宁波大学 | Robust transmission method of multimedia broadcasting wireless signals |
| EP2536030A1 (en) * | 2011-06-16 | 2012-12-19 | Panasonic Corporation | Bit permutation patterns for BICM with LDPC codes and QAM constellations |
| JP6509890B2 (en) | 2013-11-11 | 2019-05-08 | エルジー エレクトロニクス インコーポレイティド | Broadcast signal transmitting apparatus, broadcast signal receiving apparatus, broadcast signal transmitting method and broadcast signal receiving method |
| US9379928B2 (en) * | 2013-11-17 | 2016-06-28 | Lg Electronics Inc. | Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals |
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| CN1404307A (en) * | 2001-08-24 | 2003-03-19 | 国家广播电影电视总局广播科学研究院 | Data frame forming method and corresponding interleaving and encoding modulation method |
| CN101022295A (en) * | 2007-02-28 | 2007-08-22 | 华南理工大学 | Worldwide microwave inter-operative transmitting and receiving system and method for transmitting and receiving signal thereof |
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| CN1404307A (en) * | 2001-08-24 | 2003-03-19 | 国家广播电影电视总局广播科学研究院 | Data frame forming method and corresponding interleaving and encoding modulation method |
| CN101022295A (en) * | 2007-02-28 | 2007-08-22 | 华南理工大学 | Worldwide microwave inter-operative transmitting and receiving system and method for transmitting and receiving signal thereof |
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