CN102263737B - Robust transmission method for digital broadcasting wireless signals - Google Patents
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Abstract
The invention discloses a robust transmission method for digital broadcasting wireless signals, which is a time domain and frequency domain hybrid transmission scheme. The method has the advantages of low peak-to-average power ratio, short synchronous time, robustness, controllability in multiple services and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of robust transmission method for digital broadcasting wireless signals.
Background technology
Digital Television digital broadcasting wireless-related technologies and related industry thereof are that development is very fast in the Communications And Computer field, the industry of good market prospect.Digital broadcasting wireless signals robust transmitter transmission technology is the key technology of Digital Television digital broadcasting wireless 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, wideband wireless local area network, Digital Television digital broadcasting wireless transmitting 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 in wireless communication systems is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Digital broadcasting wireless signals robust transmitter transmission method is the key technology that realizes reliable digit Television Digital broadcast wireless transmissions.
Utilizing Digital Television digital broadcasting wireless transmitting 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 broadcast wireless transmissions 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 robust transmission method for digital broadcasting wireless signals, can satisfy the needs that High Data Rate can be controlled multi-service Digital Television digital broadcasting wireless 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?communications”.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，”Proceedings?of?the?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，”IEEE?Trans.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 wireless transmission problem, proposed a kind of robust transmission method for digital broadcasting wireless signals.
A kind of robust transmission method for digital broadcasting wireless signals that the present invention proposes is characterized in that it comprises the following steps:
1) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter is with the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code (the Bose Chaudhuri Hocquenghem that flows through, BCH), Bit 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, 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) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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 digital broadcasting wireless signals robust transmitter;
8) discrete sample block of the digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) digital broadcasting wireless signals robust transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) the digital broadcasting wireless signals Robust receiver detects radiofrequency signal that receiving digital broadcast wireless signal robust transmitter 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.
Robust transmission method for digital broadcasting wireless 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 digital broadcasting wireless signals robust transmitter and again synthetic; Has periodic time domain repetition training series of discrete sample value piece in the signal frame of digital broadcasting wireless signals robust transmitter; The length X of the training sequence of digital broadcasting wireless signals robust transmitter 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 digital broadcasting wireless signals robust transmitter, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of digital broadcasting wireless signals robust transmitter have orthogonality each other; Each different operational indicator sequence of digital broadcasting wireless signals robust transmitter is comprising and unique each system parameters and business model information of expressing digital broadcasting wireless signals robust 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.The digital broadcasting wireless signals Robust receiver 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 digital broadcasting wireless signals robust transmitter, the training sequence of digital broadcasting wireless signals robust transmitter, the operational indicator sequence has pseudo-random characteristics, the training sequence of digital broadcasting wireless signals robust transmitter, the operational indicator sequence has orthogonality each other, the signal frame of digital broadcasting wireless signals robust transmitter 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 digital broadcasting wireless signals Robust receiver 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.Each different operational indicator sequence of digital broadcasting wireless signals robust transmitter is comprising and unique each system parameters and business model information of expressing digital broadcasting wireless signals robust transmitter, can so that Digital Television digital broadcasting wireless transmitting 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 wireless transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to signal transmission between certain transmitter and receiver of robust transmission method for digital broadcasting wireless 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 robust transmission method for digital broadcasting wireless 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 robust transmission method for digital broadcasting wireless signals that proposes according to the present invention as shown in Figure 1, follows these steps to carry out:
1) this certain digital broadcasting wireless signals robust transmitter 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) this certain digital broadcasting wireless signals robust transmitter is with the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code (the Bose Chaudhuri Hocquenghem that flows through, BCH), Bit 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, 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; 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;
3) this certain digital broadcasting wireless signals robust transmitter 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) this certain digital broadcasting wireless signals robust transmitter 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) this certain digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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 digital broadcasting wireless signals robust transmitter, 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 digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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) this certain digital broadcasting wireless signals robust transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) this certain digital broadcasting wireless signals robust transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) this certain digital broadcasting wireless signals Robust receiver detects radiofrequency signal that receiving digital broadcast wireless signal robust transmitter 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 robust transmission method for digital broadcasting wireless signals of the present invention forms, as shown in Figure 2, implementation is as follows:
This certain digital broadcasting wireless signals robust transmitter 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.
This certain digital broadcasting wireless signals robust transmitter is with the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code of flowing through, Bit Interleave, the LDPC coding, the code element modulation, 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; 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.
This certain digital broadcasting wireless signals robust transmitter 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.
This certain digital broadcasting wireless signals robust transmitter 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 digital broadcasting wireless signals robust transmitter.
The discrete sample block of the sequence of plural training that this certain digital broadcasting wireless signals robust transmitter 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.
This certain digital broadcasting wireless signals robust transmitter 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.
This certain digital broadcasting wireless signals robust transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped.
The X of this certain digital broadcasting wireless signals robust transmitter 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 digital broadcasting wireless signals robust transmitter 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 digital broadcasting wireless signals robust transmitter.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.
This certain digital broadcasting wireless signals robust transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave.
This certain digital broadcasting wireless signals Robust receiver detects radiofrequency signal that receiving digital broadcast wireless signal robust transmitter 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. a robust transmission method for digital broadcasting wireless signals is characterized in that it comprises the following steps:
1) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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 Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, the symbol interleave, BCH represents Bose Chaudhuri Hocquenghem, LDPC represents Low Density Parity Check, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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];
6) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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 digital broadcasting wireless signals robust transmitter;
8) discrete sample block of the digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter 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) digital broadcasting wireless signals robust transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) digital broadcasting wireless signals robust transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) the digital broadcasting wireless signals Robust receiver detects radiofrequency signal that receiving digital broadcast wireless signal robust transmitter 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 robust transmission method for digital broadcasting wireless signals of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described digital broadcasting wireless signals robust transmitter, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the robust transmission method for digital broadcasting wireless 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 robust transmission method for digital broadcasting wireless signals of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the robust transmission method for digital broadcasting wireless 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; 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.
6. by the robust transmission method for digital broadcasting wireless 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 robust transmission method for digital broadcasting wireless 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 robust transmission method for digital broadcasting wireless signals of claim 1, it is characterized in that: the baseband signal reception ﹠ disposal that described digital broadcasting wireless signals Robust receiver 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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