CN102263764B - Anti-fading transmission method of digital broadcast mobile signals - Google Patents
Anti-fading transmission method of digital broadcast mobile signals Download PDFInfo
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Abstract
The invention discloses an anti-fading transmission method of digital broadcast mobile signals, which is a mixed transmission scheme of time domain and frequency domain. The method has the advantages of low PAPR (peak-to-average power ratio), short synchronous time, anti-fading performance, multiple controllable services and the like.
Description
Technical field
The invention belongs to moving communicating field, relate more specifically to a kind of anti-fading transmission method of digital broadcast mobile signals.
Background technology
Correlation technique is moved in the Digital Television digital broadcasting and related industry is that development is very fast in the Communications And Computer field, the industry of good market prospect.The key technology that the anti-fading transmitter transmission technology of digital broadcast mobile signals is Digital Television digital broadcasting mobile system plays conclusive effect for the whole system performance, 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 the OFDM Multicarrier Transmission Technology has simple in structure, the availability of frequency spectrum is high, the 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 the numerous areas such as Xdsl, wide-band mobile communication, broadband mobile local area network (LAN), Digital Television digital broadcasting mobile transmission system.
The peak-to-average power ratio that ofdm signal is higher (PAPR) has very high requirement to the range of linearity of amplifier and digital to analog converter, if the system linearity scope can not satisfy the variation of signal, then can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between the subchannel to be destroyed, produce the phase mutual interference, make system performance degradation.Therefore, the solution that must consider how to reduce the probability of occurrence of large peak power signal in the ofdm signal and reduce the nonlinear distortion impact.
Under multidiameter fading channel, can be by coding, interweave and the cascade optimal design of modulation scheme reaches large as far as possible signal diversifying exponent number, in order in equaling or exceeding the symbol sebolic addressing of minimum free distance, obtain independent decline.The different coding form of cascade can take full advantage 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 so that diversity order is improved significantly and have the bit error performance of getting well under multidiameter fading channel.
In the practical communication environment, Digital Television digital broadcasting performance of mobile communication system is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.The anti-fading transmitter transmission method of digital broadcast mobile signals is the key technology that realizes reliable digit Television Digital broadcasting Mobile Transmission.
Utilizing Digital Television digital broadcasting mobile transmission system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital Television Digital broadcasting mobile transmission system satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of anti-fading transmission method of digital broadcast mobile signals, can satisfy the needs that High Data Rate can be controlled multi-service Digital Television digital broadcasting Mobile Transmission.
Wish is done more deep understanding to the patent background can be with reference to following documents and materials:
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimedia?communica?tions”.Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digital?television?development，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.8-21，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stationary?portable?and?mobile?use，”Proceedingsofthe?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?coded?modulation，”IEEETrans.Information?Theory，vol.44，no.3，pp.927-946，May?1998.
S.Benedetto，D.Divsalar，G.Montorsi，and?F.Pollara，“Serial?concatenation?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 and can control multi-service Digital Television digital broadcasting Mobile Transmission problem, proposed a kind of anti-fading transmission method of digital broadcast mobile signals.
A kind of anti-fading transmission method of digital broadcast mobile signals that the present invention proposes is characterized in that it comprises the following steps:
1) the anti-fading transmitter of digital broadcast mobile signals converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling and processed to form the input data bit flow;
2) the anti-fading transmitter of digital broadcast mobile signals is with the input data bit of oneself the RS coding (Reed-Solomon that flows through, RS), convolutional interleave, LDPC (the Low Density Parity Check that encodes, LDPC), form the cascade interweaved coding modulation data piece of FFT at frequency domain after code element modulation and code element rotation, the symbol interleave, FFT represents the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) the anti-fading transmitter of digital broadcast mobile signals adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
Total, IFFT represents the fast discrete Fourier inverse transformation;
4) the anti-fading transmitter of digital broadcast mobile signals is divided equally into two with the cascade interweaved coding modulation data sample value of time domain discrete piece in order, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1With the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2, D
Total=[D
1, D
2];
5) the anti-fading transmitter of digital broadcast mobile signals passes through the peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2Carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
New, the cascade interweaved coding modulation data sample value of new time domain discrete piece D
NewAdopt following generate pattern to obtain, generate pattern 1 is D
New=[D
1, D
2], generate pattern 2 is
Generate pattern 3 is
Generate pattern 4 is
Generate pattern 5 is
Generate pattern 6 is
Generate pattern 7 is D
New=[D
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the synthetic cascade interweaved coding modulation data sample value of the time domain discrete piece D of 12 kinds of generate patterns
New, choose wherein have a minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
And the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece will fall
The corresponding generate pattern information that adopts send to operational indicator sequence setting unit, wherein, D
* 1Expression is to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1The cascade interweaved coding modulation data sample value of each time domain discrete carry out that conjugate operation is processed and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) the anti-fading transmitter of digital broadcast mobile signals inserts Cyclic Prefix and falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece as the protection interval, the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix falls in formation, as frame, the length of Cyclic Prefix is C, and the length of falling the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix is C+K;
7) the anti-fading transmitter of digital broadcast mobile signals with training sequence as the real part sequence of sequence of plural training, operational indicator sequence that operational indicator sequence setting unit is the set imaginary part sequence as sequence of plural training, consist of the discrete sample block of sequence of plural training in time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of digital broadcast mobile signals;
8) discrete sample block of the anti-fading transmitter of the digital broadcast mobile signals sequence of plural training that will consist of in time domain repeats continuously 2 times and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
9) the anti-fading transmitter of digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
10) the anti-fading transmitter of digital broadcast mobile signals adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) the anti-fading transmitter of digital broadcast mobile signals forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) the anti-fading receiver of digital broadcast mobile signals detects radiofrequency signal that the anti-fading transmitter of receiving digital broadcast movable signal sends and its down-conversion is formed baseband signal, utilizes the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out the baseband signal reception ﹠ disposal.
Anti-fading transmission method of digital broadcast mobile signals according to above-mentioned is characterized in that: the falling that the signal that the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece undertakies by specific 12 kinds of generate patterns by the cascade interweaved coding modulation data sample value of time domain discrete sub-block adds, subtracts, conjugate operation is processed of the anti-fading transmitter of digital broadcast mobile signals and again synthetic; Has periodic time domain repetition training series of discrete sample value piece in the signal frame of the anti-fading transmitter of digital broadcast mobile signals; The length X of the training sequence of the anti-fading transmitter of digital broadcast mobile signals is in 512,1024,2048, the length K 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 the anti-fading transmitter of digital broadcast mobile signals, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics; The training sequence of the anti-fading transmitter of digital broadcast mobile signals, operational indicator sequence have orthogonality each other; The different operational indicator sequence of each of the anti-fading transmitter of digital broadcast mobile signals is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of digital broadcast mobile signals; 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, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts the random interleaving mode.The anti-fading receiver of digital broadcast mobile signals can take full advantage of the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame is carried out the baseband signal reception ﹠ disposal, processes comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body.
Characteristics of the present invention:
The present invention is the transmission plan that a kind of time-domain and frequency-domain mixes.Generate pattern of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece of the present invention and have a minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece choosing method falls, but the very high large peak power signal probability of the maximum peak power that not only can take full advantage of ofdm signal is very low, the real part of the ofdm signal when number of sub carrier wave is larger (or imaginary part) is the characteristic of multiple Gaussian random process and whose amplitude obeys Rayleigh distribution, the amount of information of the required extra transmission of generate pattern of adopting is little, be easy to process the primary signal of recovering to obtain ofdm signal at receiver end, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.Has periodic time domain repetition training series of discrete sample value piece in the signal frame of the anti-fading transmitter of digital broadcast mobile signals, the training sequence of the anti-fading transmitter of digital broadcast mobile signals, the operational indicator sequence has pseudo-random characteristics, the training sequence of the anti-fading transmitter of digital broadcast mobile signals, the operational indicator sequence has orthogonality each other, the signal frame of the anti-fading transmitter of digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame and forming by time domain repetition training series of discrete sample value piece, and these have guaranteed that the anti-fading receiver of digital broadcast mobile signals can realize fast and accurately frame synchronization, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic reliably followed the tracks of.Cyclic Prefix is fallen the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece to form signal frame body as the insertion of protection interval, can reduce the interference effect between the cascade interweaved coding modulation data of signal frame head and frame.The input data are carried out cascade interweaved coded modulation improved diversity order, so that communication system has good bit error performance under multidiameter fading channel.The code element modulation is rotated the diversity that the mobile digital broadcast signal is provided with code element.The different operational indicator sequence of each of the anti-fading transmitter of digital broadcast mobile signals is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of digital broadcast mobile signals, can so that Digital Television digital broadcasting mobile transmission system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Transmission method of the present invention has the equal power ratio of ebb, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide high cascade interweaving encoding modulation data rate can control the plurality of advantages such as multi-service Digital Television digital broadcasting Mobile Transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to signal transmission between certain transmitter and receiver of anti-fading transmission method of digital broadcast mobile signals of the present invention.
Fig. 2 is the embodiment schematic diagram that forms according to signal frame in the signals transmission between certain transmitter and receiver of anti-fading transmission method of digital broadcast mobile signals of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
The embodiment schematic diagram of signal transmission between certain transmitter and receiver of the anti-fading transmission method of digital broadcast mobile signals that proposes according to the present invention as shown in Figure 1, follows these steps to carry out:
1) the anti-fading transmitter of this certain digital broadcast mobile signals converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling and processed to form the input data bit flow;
2) the anti-fading transmitter of this certain digital broadcast mobile signals is with the input data bit of oneself the RS coding (Reed-Solomon that flows through, RS), convolutional interleave, LDPC (the Low Density Parity Check that encodes, LDPC), form the cascade interweaved coding modulation data piece of FFT at frequency domain after code element modulation and code element rotation, the symbol interleave, FFT represents the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts the random interleaving mode;
3) the anti-fading transmitter of this certain digital broadcast mobile signals adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
Total, IFFT represents the fast discrete Fourier inverse transformation;
4) the anti-fading transmitter of this certain digital broadcast mobile signals is divided equally into two with the cascade interweaved coding modulation data sample value of time domain discrete piece in order, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1With the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2, D
Total=[D
1, D
2];
5) the anti-fading transmitter of this certain digital broadcast mobile signals passes through the peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2Carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
New, the cascade interweaved coding modulation data sample value of new time domain discrete piece D
NewAdopt following generate pattern to obtain, generate pattern 1 is D
New=[D
1, D
2], generate pattern 2 is
Generate pattern 3 is
Generate pattern 4 is
Generate pattern 5 is
Generate pattern 6 is
Generate pattern 7 is D
New=[D
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the synthetic cascade interweaved coding modulation data sample value of the time domain discrete piece D of 12 kinds of generate patterns
New, choose wherein have a minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
And the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece will fall
The corresponding generate pattern information that adopts send to operational indicator sequence setting unit, wherein, D
* 1Expression is to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1The cascade interweaved coding modulation data sample value of each time domain discrete carry out that conjugate operation is processed and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) the anti-fading transmitter of digital broadcast mobile signals inserts Cyclic Prefix and falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece as the protection interval, the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix falls in formation, as frame, the length of Cyclic Prefix is C, and the length of falling the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix is C+K;
7) the anti-fading transmitter of digital broadcast mobile signals is with the real part sequence of training sequence as sequence of plural training, the operational indicator sequence that operational indicator sequence setting unit is set is as the imaginary part sequence of sequence of plural training, consist of the discrete sample block of sequence of plural training in time domain, training sequence, the operational indicator sequence, the length of the discrete sample block of sequence of plural training all is X, the operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of digital broadcast mobile signals, and X gets 512,1024, in 2048 one; When X got 512, K got 2048, C and gets 1/4 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of FFT subcarrier is got 4KHz; When X got 1024, K got 4096, C and gets 1/8 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of FFT subcarrier is got 2KHz; When X got 2048, K got 8192, C and gets 1/16 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of FFT subcarrier is got 1KHz;
8) discrete sample block of the anti-fading transmitter of the digital broadcast mobile signals sequence of plural training that will consist of in time domain repeats continuously 2 times and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
9) the anti-fading transmitter of digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
10) the anti-fading transmitter of this certain digital broadcast mobile signals adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) the anti-fading transmitter of this certain digital broadcast mobile signals forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) the anti-fading receiver of this certain digital broadcast mobile signals detects radiofrequency signal that the anti-fading transmitter of receiving digital broadcast movable signal sends and its down-conversion is formed baseband signal, utilize the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out the baseband signal reception ﹠ disposal, process comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body.
According to the embodiment schematic diagram that signal frame in the signals transmission between certain transmitter and receiver of anti-fading transmission method of digital broadcast mobile signals of the present invention forms, as shown in Figure 2, implementation is as follows:
The anti-fading transmitter of this certain digital broadcast mobile signals converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling and processed to form the input data bit flow.
The anti-fading transmitter of this certain digital broadcast mobile signals is with flow through RS coding of the input data bit of oneself, convolutional interleave, the LDPC coding, code element modulation and code element rotation, form the cascade interweaved coding modulation data piece of FFT at frequency domain after the symbol interleave, the length of the cascade interweaved coding modulation data piece of FFT is K, the cascade interweaved coding modulation data piece of FFT is comprised of subcarrier, through IFFT it is transformed to the discrete cascade interweaving encoding modulating data sample value piece of time domain again, generates by the peak-to-average power ratio adjustment unit and choose the cascade interweaved coding modulation data sample value of the peak-to-average power ratio time domain discrete piece that falls that wherein has minimum peak-to-average power ratio and simultaneously the generate pattern information of the corresponding employing of institute is sent to operational indicator sequence setting unit.The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts the random interleaving mode.
The anti-fading transmitter of this certain digital broadcast mobile signals inserts Cyclic Prefix and falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece as the protection interval; the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix falls in formation; as frame, the length of Cyclic Prefix is C.
The anti-fading transmitter of this certain digital broadcast mobile signals with training sequence as the real part sequence of sequence of plural training, operational indicator sequence that operational indicator sequence setting unit is the set imaginary part sequence as sequence of plural training, consist of the discrete sample block of sequence of plural training in time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of digital broadcast mobile signals.
The discrete sample block of the sequence of plural training that the anti-fading transmitter of this certain digital broadcast mobile signals will consist of in time domain repeats continuously 2 times and forms time domain repetition training series of discrete sample value piece on time domain, as frame head.
The anti-fading transmitter of this certain digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame with time domain repetition training series of discrete sample value piece, to form signal frame.
The anti-fading transmitter of this certain digital broadcast mobile signals adopts square root raised cosine filter that the signal pulse of signal frame is shaped.
The anti-fading transmitter of this certain digital broadcast mobile signals with the baseband signal up-conversion to carrier wave.
The X of the anti-fading transmitter of this certain digital broadcast mobile signals gets in 512,1024,2048; When X got 512, K got 2048, C and gets 1/4 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of FFT subcarrier is got 4KHz; When X got 1024, K got 4096, C and gets 1/8 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of FFT subcarrier is got 2KHz; When X got 2048, K got 8192, C and gets 1/16 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of FFT subcarrier is got 1KHz; Training sequence, operational indicator sequence as the anti-fading transmitter of digital broadcast mobile signals form 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 Phase shift 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 the anti-fading transmitter of digital broadcast mobile signals.When X got 512, the corresponding signal to signal frame carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.1; When X got 1024, the corresponding signal to signal frame carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.05; When X got 2048, the corresponding signal to signal frame carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.025.
The anti-fading transmitter of this certain digital broadcast mobile signals forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave.
The anti-fading receiver of this certain digital broadcast mobile signals detects radiofrequency signal that the anti-fading transmitter of receiving digital broadcast movable signal sends and its down-conversion is formed baseband signal, utilize the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out the baseband signal reception ﹠ disposal, process comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body.
The above has been described in detail specific embodiments of the invention by reference to the accompanying drawings, but the present invention is not limited to above-described embodiment, and in 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. an anti-fading transmission method of digital broadcast mobile signals is characterized in that it comprises the following steps:
1) the anti-fading transmitter of digital broadcast mobile signals converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling and processed to form the input data bit flow;
2) the anti-fading transmitter of digital broadcast mobile signals is flowed through the input data bit of oneself and is formed the cascade interweaved coding modulation data piece of FFT at frequency domain after RS coding, convolutional interleave, LDPC coding, code element modulation and code element rotation, the symbol interleave, RS represents Reed-Solomon, LDPC represents Low Density Parity Check, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) the anti-fading transmitter of digital broadcast mobile signals adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
Total
4) the anti-fading transmitter of digital broadcast mobile signals is divided equally into two with the cascade interweaved coding modulation data sample value of time domain discrete piece in order, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1With the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2, D
Total=[D
1, D
2];
5) the anti-fading transmitter of digital broadcast mobile signals passes through the peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2Carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
New, the cascade interweaved coding modulation data sample value of new time domain discrete piece D
NewAdopt following generate pattern to obtain, generate pattern 1 is D
New=[D
1, D
2], generate pattern 2 is
Generate pattern 3 is
Generate pattern 4 is
Generate pattern 5 is
Generate pattern 6 is
Generate pattern 7 is D
New=[D
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the synthetic cascade interweaved coding modulation data sample value of the time domain discrete piece D of 12 kinds of generate patterns
New, choose wherein have a minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
And the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece will fall
The corresponding generate pattern information that adopts send to operational indicator sequence setting unit, wherein, D
* 1Expression is to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1The cascade interweaved coding modulation data sample value of each time domain discrete carry out that conjugate operation is processed and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) the anti-fading transmitter of digital broadcast mobile signals inserts Cyclic Prefix and falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece as the protection interval, the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix falls in formation, as frame, the length of Cyclic Prefix is C, and the length of falling the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix is C+K;
7) the anti-fading transmitter of digital broadcast mobile signals with training sequence as the real part sequence of sequence of plural training, operational indicator sequence that operational indicator sequence setting unit is the set imaginary part sequence as sequence of plural training, consist of the discrete sample block of sequence of plural training in time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of digital broadcast mobile signals;
8) discrete sample block of the anti-fading transmitter of the digital broadcast mobile signals sequence of plural training that will consist of in time domain repeats continuously 2 times and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
9) the anti-fading transmitter of digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
10) the anti-fading transmitter of digital broadcast mobile signals adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) the anti-fading transmitter of digital broadcast mobile signals forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) the anti-fading receiver of digital broadcast mobile signals detects radiofrequency signal that the anti-fading transmitter of receiving digital broadcast movable signal sends and its down-conversion is formed baseband signal, utilizes the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out the baseband signal reception ﹠ disposal.
2. by the anti-fading transmission method of digital broadcast mobile signals of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of the anti-fading transmitter of described digital broadcast mobile signals, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the anti-fading transmission method of digital broadcast mobile signals of claim 2, it is characterized in that: described training sequence, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics.
4. by the anti-fading transmission method of digital broadcast mobile signals of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the anti-fading transmission method of digital broadcast mobile signals of claim 1, it is characterized in that: the encoding rate of described LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts the random interleaving mode.
6. by the anti-fading transmission method of digital broadcast mobile signals of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is comprised of subcarrier; When X got 512, K got 2048, and the frequency interval of subcarrier is got 4KHz; When X got 1024, K got 4096, and the frequency interval of subcarrier is got 2KHz; When X got 2048, K got 8192, and the frequency interval of subcarrier is got 1KHz.
7. by the anti-fading transmission method of digital broadcast mobile signals of claim 1, it is characterized in that: the length C value of described Cyclic Prefix is relevant with the X value; 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 anti-fading transmission method of digital broadcast mobile signals of claim 1, it is characterized in that: the baseband signal reception ﹠ disposal that the anti-fading receiver of described digital broadcast mobile signals carries out, one of them step are that the time domain and frequency domain combined alternate analysis of signal frame head and signal frame body is processed.
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| 王劲涛等.数字电视广播的单频网实现及场地实验.《清华大学学报（自然科学版）》.2005,第45卷(第10期),1385-1388. * |
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