CN102255853B - Robust method for transmitting wireless digital broadcast signal - Google Patents
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- CN102255853B CN102255853B CN201110248099.3A CN201110248099A CN102255853B CN 102255853 B CN102255853 B CN 102255853B CN 201110248099 A CN201110248099 A CN 201110248099A CN 102255853 B CN102255853 B CN 102255853B
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- 238000000034 method Methods 0.000 title claims abstract description 34
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- 230000015556 catabolic process Effects 0.000 description 1
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Abstract
The invention discloses a robust method for transmitting a wireless digital broadcast signal, which is a transmission proposal of time domain and frequency domain mixing. The robust method for transmitting a wireless digital broadcast signal disclosed by the invention has the advantages of low peak-to-average power ratio, short synchronization time, robustness, controllable multi-service etc.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of Robust method for transmitting wireless digital broadcast signal.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital television and broadcasting transinission system, as the important component part of digital television broadcasting, the development of its correlation technique, closely bound up with people's quality of life, and be therefore subject to people's extensive concern especially.Digital television broadcasting correlation technique and related industry thereof are that in Communications And Computer field, development is very fast, the industry of good market prospect.In digital television broadcasting correlation technique, the emphasis that various countries pay close attention to is at present that the digital television broadcasting how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Transmission technology is the key technology of digital television broadcasting system, for whole system performance, plays conclusive effect, is the object of everybody primary study.
Due to the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes and becomes more and more easier.Because OFDM Multicarrier Transmission Technology has simple in structure, the availability of frequency spectrum is high, the plurality of advantages such as in the time of can resisting frequency selectivity and channel, becomes and extremely everybody concern 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 broadcasting.
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 system linearity scope can not meet the variation of signal, can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between subchannel to be destroyed, produce 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 ofdm signal and reduce 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, to obtain independent decline in equaling or exceeding the symbol sebolic addressing of minimum free distance.The different coding form of cascade can make full use of the advantage of different coding technology; Between coding and code element modulation, insert bit interleaver, can so that coding and modulated process is relatively independent and from different multi-system symbolic numbers, expand diversity order to different binary bits number, thereby the bit error performance that diversity order is improved significantly and has had under multidiameter fading channel.
In practical communication environment, Digital Television wireless digital broadcasting communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Wireless digital broadcasting signal transmitter transmission method is the key technology that realizes the digital broadcasting of reliable digit TV robust wireless.
Utilizing Digital Television wireless digital broadcasting 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 TV robust wireless digital broadcasting transmission system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of Robust method for transmitting wireless digital broadcast signal just, can meet the needs that High Data Rate can be controlled multi-service Digital Television robust wireless digital broadcast transmission.
Wish is done more deep understanding to 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?andEmerging?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 robust wireless digital broadcasting problem, proposed a kind of Robust method for transmitting wireless digital broadcast signal.
A kind of Robust method for transmitting wireless digital broadcast signal that the present invention proposes, is characterized in that it comprises the following steps:
1) robust wireless digital broadcast signal 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 processing to form input data bit flow;
2) robust wireless digital broadcast signal transmitter is by 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), after code element modulation, symbol interleave, on frequency domain, form the cascade interweaved coding modulation data piece of FFT, FFT represents fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) robust wireless digital broadcast signal 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 fast discrete Fourier inverse transformation;
4) robust wireless digital broadcast signal transmitter is divided equally into two by 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) robust wireless digital broadcast signal transmitter passes through 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
Generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the 12 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is 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 adopting 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 conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) the real part sequence of robust wireless digital broadcast signal transmitter using training sequence as sequence of plural training, the imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing robust wireless digital broadcast signal transmitter;
7) robust wireless digital broadcast signal transmitter repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain for 4 times and embeds training sequence discrete sample block in time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 * X of training sequence discrete sample block;
8) robust wireless digital broadcast signal transmitter will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame;
9) robust wireless digital broadcast signal transmitter is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) robust wireless digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) robust wireless digital broadcast signal transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that robust wireless digital broadcasting signal receiver detection reception wireless digital broadcasting signal transmitter sends also forms baseband signal by its down-conversion, utilizes the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal.
Robust method for transmitting wireless digital broadcast signal 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 robust wireless digital broadcast signal transmitter and again synthetic; In the signal frame of robust wireless digital broadcast signal transmitter, there is periodic time domain and embed training sequence discrete sample block; The length X of the training sequence of robust wireless digital broadcast signal 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 robust wireless digital broadcast signal transmitter, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of robust wireless digital broadcast signal transmitter have orthogonality each other; Each different operational indicator sequence of robust wireless digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing robust wireless digital broadcast signal transmitter; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.Robust wireless digital broadcasting signal receiver can make full use of the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame is carried out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body, processes.
Feature 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 there is 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 make full use 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 adopting is little, be easy to process at receiver end the primary signal of recovering to obtain ofdm signal, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.In the signal frame of robust wireless digital broadcast signal transmitter, there is periodic time domain and embed training sequence discrete sample block, the training sequence of robust wireless digital broadcast signal transmitter, operational indicator sequence has pseudo-random characteristics, the training sequence of robust wireless digital broadcast signal transmitter, operational indicator sequence has orthogonality each other, it is by falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece that the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls in the time domain embedding training sequence of robust wireless digital broadcast signal transmitter, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that robust wireless digital broadcasting signal receiver can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic are reliably followed the tracks of.Using Cyclic Prefix as protection interval, insert time domain embedding training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece to form signal frame, can reduce the interference effect between adjacent signals frame.Input data are carried out to cascade interweaved coded modulation and improved diversity order, the bit error performance that communication system has been had under multidiameter fading channel.Each different operational indicator sequence of robust wireless digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing robust wireless digital broadcast signal transmitter, can, so that Digital Television robust wireless digital broadcasting 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 low peak-to-average power ratio, 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 robust wireless digital broadcast transmission.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of signal transmission between certain transmitter and receiver of Robust method for transmitting wireless digital broadcast signal of the present invention.
Fig. 2 is the embodiment schematic diagram forming according to signal frame in signals transmission between certain transmitter and receiver of Robust method for transmitting wireless digital broadcast signal 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 method for transmitting wireless digital broadcast signal proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) this certain robust wireless digital broadcast signal 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 processing to form input data bit flow;
2) this certain robust wireless digital broadcast signal transmitter is flowed through the input data bit of oneself after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, FFT represents 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 random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.
3) this certain robust wireless digital broadcast signal 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 fast discrete Fourier inverse transformation;
4) this certain robust wireless digital broadcast signal transmitter is divided equally into two by 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 robust wireless digital broadcast signal transmitter passes through 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 12 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is 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 adopting 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 conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) the real part sequence of this certain robust wireless digital broadcast signal transmitter using training sequence as sequence of plural training, imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, training sequence, operational indicator sequence, the length of the discrete sample block of sequence of plural training is all X, operational indicator sequence is comprising and unique each system parameters and business model information of expressing robust wireless digital broadcast signal transmitter, X gets 512, 1024, in 2048 one,
7) this certain robust wireless digital broadcast signal transmitter repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain for 4 times and embeds training sequence discrete sample block in time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 * X of training sequence discrete sample block; When X gets 512, K gets 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X gets 1024, K gets 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X gets 2048, K gets 8192, and the frequency interval of corresponding subcarrier is got 1KHz;
8) this certain robust wireless digital broadcast signal transmitter will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame;
9) this certain robust wireless digital broadcast signal transmitter is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C; When X gets 512, C gets 1/4 of K size; When X gets 1024, C gets 1/8 of K size; When X gets 2048, C gets 1/16 of K size;
10) this certain robust wireless digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) this certain robust wireless digital broadcast signal transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that this certain robust wireless digital broadcasting signal receiver detection reception wireless digital broadcasting signal transmitter sends also forms baseband signal by its down-conversion, utilize the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body, process.
The embodiment schematic diagram forming according to signal frame in signals transmission between certain transmitter and receiver of Robust method for transmitting wireless digital broadcast signal of the present invention, as shown in Figure 2, is specifically implemented as follows:
This certain robust wireless digital broadcast signal 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 processing to form input data bit flow.
This certain robust wireless digital broadcast signal transmitter is by the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code of flowing through, Bit Interleave, LDPC coding, code element modulation, after symbol interleave, on frequency domain, form the cascade interweaved coding modulation data piece of FFT, through IFFT, be transformed to again the discrete cascade interweaving encoding modulating data sample value piece of time domain, by peak-to-average power ratio adjustment unit, generate and to choose the cascade interweaved coding modulation data sample value of the peak-to-average power ratio time domain discrete piece that falls wherein with minimum peak-to-average power ratio and the generate pattern information of the corresponding employing of institute is sent to operational indicator sequence setting unit simultaneously.The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.
The cascade interweaved coding modulation data piece of FFT is comprised of subcarrier.The length of the cascade interweaved coding modulation data piece of FFT is K; When X gets 512, corresponding K gets 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X gets 1024, corresponding K gets 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X gets 2048, corresponding K gets 8192, and the frequency interval of corresponding subcarrier is got 1KHz.
The real part sequence of this certain robust wireless digital broadcast signal transmitter using training sequence as sequence of plural training, the imaginary part sequence using operational indicator sequence as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, then it is repeated to form for 4 times continuously time domain embedding training sequence discrete sample block in time domain.The length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all 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 robust wireless digital broadcast signal 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 meets above-mentioned feature can and be realized as walsh sequence, the Hadamard sequences of orthogonal sequence or the orthogonal sequence being produced by other modes by one group of Phase shift m sequence of a kind of specific type as pseudo-random number sequence.Each different operational indicator sequence is comprising and unique each system parameters and business model information of expressing robust wireless digital broadcast signal transmitter.
This certain robust wireless digital broadcast signal transmitter will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame; In the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls in time domain embedding training sequence, insert Cyclic Prefix as protection interval, form signal frame.As protecting the length of the Cyclic Prefix at interval, be C; When X gets 512, corresponding C gets 1/4 of K size; When X gets 1024, corresponding C gets 1/8 of K size; When X gets 2048, corresponding C gets 1/16 of K size.
This certain robust wireless digital broadcast signal transmitter adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.When X gets 512, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.1; When X gets 1024, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.05; When X gets 2048, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.025.
This certain robust wireless digital broadcast signal transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave.
The radiofrequency signal that this certain robust wireless digital broadcasting signal receiver detection reception robust wireless digital broadcast signal transmitter sends also forms baseband signal by its down-conversion, utilize the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body, process.
By reference to the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to above-described embodiment, in the spirit and scope situation of claim that does not depart from the application, those skilled in the art can make various modifications or remodeling.
Claims (8)
1. a Robust method for transmitting wireless digital broadcast signal, is characterized in that it comprises the following steps:
1) robust wireless digital broadcast signal 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 processing to form input data bit flow;
2) robust wireless digital broadcast signal transmitter is flowed through the input data bit of oneself after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, BCH represents Bose Chaudhuri Hocquenghem, LDPC represents Low Density Parity Check, the length of the cascade interweaved coding modulation data piece of FFT is K, and K be take symbol as unit;
3) robust wireless digital broadcast signal 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) robust wireless digital broadcast signal transmitter is divided equally into two by 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) robust wireless digital broadcast signal transmitter passes through 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 12 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is 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 adopting 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 conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) the real part sequence of robust wireless digital broadcast signal transmitter using training sequence as sequence of plural training, the imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, X be take symbol as unit, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing robust wireless digital broadcast signal transmitter;
7) robust wireless digital broadcast signal transmitter repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain for 4 times and embeds training sequence discrete sample block in time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 * X of training sequence discrete sample block;
8) robust wireless digital broadcast signal transmitter will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame;
9) robust wireless digital broadcast signal transmitter is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) robust wireless digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) robust wireless digital broadcast signal transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that robust wireless digital broadcasting signal receiver detection reception robust wireless digital broadcast signal transmitter sends also forms baseband signal by its down-conversion, utilizes the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal.
2. by the Robust method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described robust wireless digital broadcast signal transmitter, operational indicator sequence, sequence of plural training is got in 512 symbols, 1024 symbols, 2048 symbols.
3. by the Robust method for transmitting wireless digital broadcast signal 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 method for transmitting wireless digital broadcast signal of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the Robust method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is comprised of subcarrier; When X gets 512 symbols, sub-carrier number gets 2048, and the frequency interval of subcarrier is got 4KHz; When X gets 1024 symbols, sub-carrier number gets 4096, and the frequency interval of subcarrier is got 2KHz; When X gets 2048 symbols, sub-carrier number gets 8192, and the frequency interval of subcarrier is got 1KHz.
6. by the Robust method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: the length C value of described Cyclic Prefix is relevant with X value; When X gets 512 symbols, C gets 1/4 of K size; When X gets 1024 symbols, C gets 1/8 of K size; When X gets 2048 symbols, C gets 1/16 of K size.
7. by the Robust method for transmitting wireless digital broadcast signal 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 random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.
8. by the Robust method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: the baseband signal reception & disposal that described robust wireless digital broadcasting signal receiver carries out, one of them step is that the time domain and frequency domain combined alternate analysis of signal frame head and signal frame body is processed.
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