CN101420409B - Interference resistant modulation method for digital television terrestrial broadcast transmitter - Google Patents
Interference resistant modulation method for digital television terrestrial broadcast transmitter Download PDFInfo
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- CN101420409B CN101420409B CN2008102282878A CN200810228287A CN101420409B CN 101420409 B CN101420409 B CN 101420409B CN 2008102282878 A CN2008102282878 A CN 2008102282878A CN 200810228287 A CN200810228287 A CN 200810228287A CN 101420409 B CN101420409 B CN 101420409B
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Abstract
The present invention discloses a method for modulating digital television ground broadcasting transmitter based on insertion training sequence and LDPC code, wherein the method comprises the following steps: 1) forming an FFT cascade connected interweaved code modulated data block on frequency domain with the input bit flow through BCH encoding, bit interweaving, LDPC encoding, code modulating and code interweaving; 2) switching the data block to a time domain discrete cascade connected interweaved code modulated data block; 3) forming a complex training sequence discrete sample block with a mode that a training sequence is used as a real part sequence and an operational indicator sequence is used as an imaginary part sequence; 4) continuously repeating the complex training sequence for four times to form a time domain insertion training sequence discrete sample block; 5) directly overlapping the time domain discrete cascade connected interweaved code modulated data block with time insertion training sequence discrete sample block for forming a frame body; 6) inserting a circulating prefix into the frame body for forming a signal frame, 7) forming a signal frame pulse with a square-root raised cosine roll-off filter; and 8) upconverting the baseband signal to the carrier.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of based on embedding 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 from simulation gradually.Digital television ground broadcast transmission system, as the important component part of DTTB, its development of technologies, closely bound up with people's quality of life, and therefore received people's extensive concern especially.DTTB 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 DTTB correlation technique, the emphasis of various countries' concern at present is that the DTTB 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 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, DTTB.
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 cascade optimal design of modulation scheme reaches big as far as possible signal diversifying exponent number, so that in equaling or exceeding the symbol sebolic addressing of minimum free distance, obtain independent decline.Cascade different coding form can make full use of the advantage of different coding technology; Between coding and code element modulation, insert bit interleaver; Can be so that coding be relatively independent with modulated process and expand diversity order to different binary bits number from different multi-system symbolic numbers, thus make diversity order be improved significantly and under multidiameter fading channel, have the bit error performance of getting well.
Utilizing 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; It is a kind of based on embedding training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method to the present invention is directed to the proposition of practical communication environment, can satisfy the needs of High Data Rate may command multi-service DTTB transmission.
Desire is done more deep understanding to the patent background can be with reference to following documents and materials:
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Summary of the invention
The present invention is directed to High Data Rate may command multi-service DTTB problem, proposed a kind of based on embedding training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method.
What the present invention proposed is a kind of based on embedding 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 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 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 cascade interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed the cascade interweaved coding modulation data piece of training sequence, as frame;
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 the cascade interweaved coding modulation data piece of training sequence (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.
, it is characterized in that based on embedding training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method according to above-mentioned: have periodic time domain in the signal frame of digital television ground broadcast transmitter and embed training sequence discrete sample block; The length X of the training sequence of digital television ground broadcast transmitter is in 512,1024,2048; The length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT is respectively 2048,4096,8192; The frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively 1/4,1/8,1/16 of the cascade interweaved coding modulation data block length of FFT K size; The training sequence of 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; Each different service index series 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.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, operational indicator sequence have pseudo-random characteristics; The training sequence of digital television ground broadcast transmitter, operational indicator sequence have orthogonality each other; It is that discrete cascade interweaving encoding modulating data sample value piece, time domain by time domain embeds directly stack and forming of training sequence discrete sample block that the time domain of digital television ground broadcast transmitter embeds the training sequence coded data block, and these have guaranteed that digital television ground broadcast transmitter 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.Cyclic Prefix is inserted time domain at interval as protection embed the training sequence coded data block, can reduce the interference effect between the adjacent signals frame to form signal frame.Adopt coding, interweave and the cascade optimal design of modulation scheme is carried out cascade interweaved coded modulation to the input data and improved diversity order, make communication system under multidiameter fading channel, have good bit error performance.Each different service index series 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, plurality of advantages such as High Data Rate may command multi-service DTTB transmission can be provided.
Description of drawings
Fig. 1 is according to the embodiment sketch map based on certain transmitter that embeds training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method of the present invention.
Fig. 2 is the embodiment sketch map that forms signal frame based on certain transmitter that embeds training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method according to of the present invention.
Embodiment
To combine accompanying drawing that specific embodiment of the present invention is described in detail below.
According to the embodiment that the present invention proposes based on certain transmitter that embeds training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method, as shown in Figure 1, follow these steps to carry out:
1) this certain digital television ground broadcast transmitter is flowed through the input data bit flow digital television ground broadcast transmitter of oneself and further on frequency domain, is formed 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 Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, the symbol interleave with the input data bit of oneself; When X got 512, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 8192, and the frequency interval of corresponding subcarrier is got 1KHz);
2) this certain 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) 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 cascade interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed the cascade interweaved coding modulation data piece of training sequence, as frame;
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 the cascade interweaved coding modulation data block length of FFT K size; When X got 1024, corresponding C got 1/8 of the cascade interweaved coding modulation data block length of FFT K size; When X gets 2048, corresponding C get the cascade interweaved coding modulation data block length of FFT K size 1/16) as protection at interval (frame head) insert time domain and embed the cascade interweaved coding modulation data piece of training sequence (frame), to form signal frame;
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.
According to the embodiment based on certain transmitter formation signal frame that embeds training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method of the present invention, as shown in Figure 2, practical implementation is following:
This certain digital television ground broadcast transmitter is flowed through the input data bit of oneself and further on frequency domain, is 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, 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; When X got 512, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of corresponding FFT got 8192, and the frequency interval of corresponding subcarrier is got 1KHz.
This certain 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 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 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 cascade interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed the cascade interweaved coding modulation data piece of training sequence, as frame; In the cascade interweaved coding modulation data piece of time domain embedding training sequence, insert Cyclic Prefix at interval, form signal frame as protection.
Length as protection Cyclic Prefix at interval is C; When X got 512, corresponding C got 1/4 of the cascade interweaved coding modulation data block length of FFT K size; When X got 1024, corresponding C got 1/8 of the cascade interweaved coding modulation data block length of FFT K size; When X got 2048, corresponding C got 1/16 of the cascade interweaved coding modulation data block length of FFT K size.
This certain 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, O.05 the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping was got; 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.
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 (8)
1. one kind based on embedding 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 further on frequency domain, is 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; The length of the cascade interweaved coding modulation data piece of FFT is represented with parameter K, K＞0;
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 representes the fast discrete Fourier inverse transformation;
3) 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; The equal in length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is also represented X＞0 with parameter X;
4) digital television ground broadcast transmitter 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 of time domain embedding training sequence discrete sample block is numerically equal to the length of the discrete cascade interweaving encoding modulating data sample value piece of time domain;
5) digital television ground broadcast transmitter embeds training sequence discrete sample block with the discrete cascade interweaving encoding modulating data sample value piece of time domain, time domain and directly superposes and form time domain and embed the cascade interweaved coding modulation data piece of training sequence, as frame;
6) digital television ground broadcast transmitter is that the cascade interweaved coding modulation data piece of frame head insertion time domain embedding training sequence is a frame with Cyclic Prefix as protection at interval, and to form signal frame, the length of Cyclic Prefix is represented with parameters C, C＞0;
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 based on embedding training sequence and 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 said digital television ground broadcast transmitter, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
By claim 2 based on embedding training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method; It is characterized in that: said training sequence, operational indicator sequence have pseudo-random characteristics, and said training sequence, operational indicator sequence have orthogonality each other.
By claim 1 based on embedding training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method, it is characterized in that: the cascade interweaved coding modulation data piece of said FFT is made up of subcarrier; When X got 512, sub-carrier number got 2048; When X got 1024, sub-carrier number got 4096; When X got 2048, sub-carrier number got 8192.
By claim 4 based on embedding training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method, 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.
By claim 1 based on embedding training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method, it is characterized in that: said signal frame is inserted into time domain by Cyclic Prefix and embeds the cascade interweaved coding modulation data piece of training sequence and form.
By claim 1 based on embedding training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method, it is characterized in that: the length of said Cyclic Prefix is C; When X got 512, C numerically got 1/4 of K size; When X got 1024, C numerically got 1/8 of K size; When X got 2048, C numerically got 1/16 of K size.
By claim 1 based on embedding training sequence and cascade interweaved code modulated digital television ground broadcast transmitter modulation method; It is characterized in that: the said encoding rate that the input data are carried out the LDPC coding that Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, symbol interleave handle 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; Symbol constellations figure mapping mode adopts the Gray code mapping, and symbol interleave adopts the random interleaving mode.
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| CN101778077B (en) * | 2010-03-03 | 2012-10-03 | 宁波大学 | Robust wireless multimedia broadcast signal transmission method |
| CN101778076B (en) * | 2010-03-03 | 2012-10-03 | 宁波大学 | Anti-fading wireless multimedia broadcasting signal transmission method |
| CN102281230B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Multimedia broadcast mobile signal robust framing modulation method |
| CN102281245B (en) * | 2011-08-22 | 2013-08-07 | 宁波大学 | Single frequency network robustness wireless digital broadcast signal transmission method |
| CN102263753B (en) * | 2011-08-22 | 2013-10-30 | 宁波大学 | Robust mobile digital broadcast signal transmitting method |
| CN102255863B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Anti-noise digital mobile broadcast signal transmitting method |
| CN102263751B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Single-frequency-network anti-noise mobile digital broadcast signal transmission method |
| CN102281233B (en) * | 2011-08-22 | 2013-08-21 | 宁波大学 | Multimedia broadcast mobile signal framing modulation method |
| CN102281234B (en) * | 2011-08-22 | 2013-08-21 | 宁波大学 | Multimedia broadcast mobile signal anti-fading framing modulation method |
| JP2015156530A (en) * | 2014-02-19 | 2015-08-27 | ソニー株式会社 | Data processor and data processing method |
| CN106161299B (en) * | 2015-03-24 | 2019-02-15 | 中兴通讯股份有限公司 | A kind of data transmission method and device |
| CN111935750B (en) * | 2020-08-21 | 2021-08-03 | 苏州大学 | Capacity optimization method of mobile wireless optical communication system, communication method and system |
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| CN1478341A (en) * | 2000-11-29 | 2004-02-25 | ����ɭ�绰�ɷ�����˾ | Methods and appangements in telecommunications system |
| US20070230324A1 (en) * | 2004-02-13 | 2007-10-04 | Neocific, Inc. | Methods and Apparatus for Multi-Carrier Communication Systems with Adaptive Transmission and Feedback |
| 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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