CN103763258A - Transmission method for robust wireless digital broadcast signals - Google Patents
Transmission method for robust wireless digital broadcast signals Download PDFInfo
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- CN103763258A CN103763258A CN201410022882.1A CN201410022882A CN103763258A CN 103763258 A CN103763258 A CN 103763258A CN 201410022882 A CN201410022882 A CN 201410022882A CN 103763258 A CN103763258 A CN 103763258A
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Abstract
The invention discloses a transmission method for robust wireless digital broadcast signals. The method is a framing modulation scheme with time domain and frequency domain mixed. According to the framing modulation method for the robust wireless digital broadcast signals, cascade interleaving code modulation is performed, training sequence optimization design is performed, signal generating modes are implemented, and a signal selecting method is implemented, so that original signals of OFDM signals are easy to obtain through processing and recovering at a receiver terminal, and the framing modulation method has the advantages of being low in peak-to-average power ratio, short in synchronization time and resistant to channel fading and providing multiple controllable services.
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 robust wireless digital broadcasting transmission system, as the important component part of Digital Television robust wireless digital 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 robust wireless digital 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 robust wireless digital broadcasting correlation technique, the emphasis that various countries pay close attention to is at present that the Digital Television robust wireless digital broadcasting how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Robust wireless digital broadcast signal transmitter transmission technology is the key technology of Digital Television robust wireless digit 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, the digital broadcasting of Digital Television robust wireless.
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.
In practical communication environment, Digital Television robust wireless digital broadcast communications system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Robust wireless digital broadcast signal transmitter transmission method is the key technology that realizes the digital broadcasting of reliable digit TV robust wireless.
Utilizing Digital Television robust 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?and?Emerging?Services，pp.8-21，Jan.2006.
M.S.Richer，G.Reitmeier，T.Gurley，G.A.Jones，J.Whitaker，and?R.
Rast.“The?ATSC?digital?television?system，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digi?tal?Television：Technology?and?Emerging?Services，pp.37-43，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.
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 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 the numerical value of K is got even number;
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=[d
0, d
1..., d
k-2, d
k-1];
4) robust wireless digital broadcast signal transmitter is by the cascade interweaved coding modulation data sample value of time domain discrete piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separated strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete that generates
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
even=[d
1, d
3..., d
k-3, d
k-1];
5) robust wireless digital broadcast signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
very, the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
evencarry out signal power adjustment and corresponding signal and process also 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
very, D
even], 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
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
compare the 18 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
*very represent the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
verythe 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; D
* evenexpression is to the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe 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) robust wireless digital broadcast signal transmitter Insert service index series after training sequence forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing robust wireless digital broadcast signal transmitter; 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 of training sequence discrete sample block;
7) 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;
8) 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;
9) robust wireless digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) 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;
11) 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 architectural characteristic of training sequence characteristic and 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: robust wireless digital broadcast signal transmitter the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls by the cascade interweaved coding modulation data sample value of time domain discrete piece demultiplexing and carry out signal power adjustment and corresponding signal according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separated time domain discrete strange sub-block of cascade interweaved coding modulation data sample value generating and the even sub-block of the cascade interweaved coding modulation data sample value of time domain discrete and process and pass through 18 kinds of generate patterns of particular design and again synthesize; The training sequence of robust wireless digital broadcast signal transmitter is comprised of the first training sequence and the second training sequence; The first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix that the new sequence that produces and length thereof are G and form; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8; The circulating prefix-length C of robust wireless digital broadcast signal transmitter signal frame is 1/16 of the cascade interweaved coding modulation data block length of FFT K; The operational indicator sequence of robust wireless digital broadcast signal transmitter has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; 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 cascade interweaved coding modulation data piece of FFT of robust wireless digital broadcast signal transmitter is comprised of subcarrier, and the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz.Robust wireless digital broadcasting signal receiver can make full use of the architectural characteristic of training sequence characteristic and signal frame and carry out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body, processes.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.
Feature of the present invention:
The present invention is the framing modulation scheme that a kind of time-domain and frequency-domain mixes.The cascade interweaved coding modulation data sample value of time domain discrete of the present invention piece demultiplexing also generates the time domain discrete strange sub-block of cascade interweaved coding modulation data sample value and the even sub-block of the cascade interweaved coding modulation data sample value of time domain discrete and the corresponding signal power adjustment of carrying out and signal processing according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separation, what by particular design 18 kinds fell the generate pattern of the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece and had a minimum peak-to-average power ratio falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece choosing method, 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 power regularity of distribution that the characteristic that the real part of the ofdm signal when number of sub carrier wave is larger (or imaginary part) is multiple Gaussian random process and whose amplitude obeys Rayleigh distribution and then low complex degree ground effectively change over frame signal reaches the object that reduces peak-to-average power ratio, 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.Training sequence in the signal frame of robust wireless digital broadcast signal transmitter is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, 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.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 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, 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 the numerical value of K is got even number; 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=[d
0, d
1..., d
k-2, d
k-1];
4) this certain robust wireless digital broadcast signal transmitter is by the cascade interweaved coding modulation data sample value of time domain discrete piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separated strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete that generates
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
even=[d
1, d
3..., d
k-3, d
k-1];
5) this certain robust wireless digital broadcast signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
very, the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
evencarry out signal power adjustment and corresponding signal and process also 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
very, D
even], 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
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
compare the 18 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
* veryexpression is to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
verythe 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; D
* evenexpression is to the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe 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) this certain robust wireless digital broadcast signal transmitter Insert service index series after training sequence forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing robust wireless digital broadcast signal transmitter; 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 of training sequence discrete sample block;
7) 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;
8) 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;
9) this certain robust wireless digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) 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;
11) 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 architectural characteristic of training sequence characteristic and 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, BCH represents Bose Chaudhuri Hocquenghem, LDPC represents Low Density Parity Check, 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 cascade interweaved coding modulation data piece of FFT of this certain robust wireless digital broadcast signal transmitter is comprised of subcarrier, and the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz; 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 training sequence of this certain robust wireless digital broadcast signal transmitter is comprised of the first training sequence and the second training sequence; The first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix that the new sequence that produces and length thereof are G and form; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8.
This certain robust wireless digital broadcast signal transmitter Insert service index series after training sequence forms time domain and embeds training sequence discrete sample block in time domain.
The operational indicator sequence of this certain robust wireless digital broadcast signal transmitter has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of this certain 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 time domain of this certain robust wireless digital broadcast signal transmitter 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 of training sequence discrete sample block; 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; 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; The circulating prefix-length C of this certain robust wireless digital broadcast signal transmitter signal frame is 1/16 of the cascade interweaved coding modulation data block length of FFT K.
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.
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 architectural characteristic of training sequence characteristic and 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 (6)
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 the numerical value of K is got even number;
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=[d
0, d
1..., d
k-2, d
k-1];
4) robust wireless digital broadcast signal transmitter is by the cascade interweaved coding modulation data sample value of time domain discrete piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separated strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete that generates
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
even=[d
1, d
3..., d
k-3, d
k-1];
5) robust wireless digital broadcast signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
very, the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
evencarry out signal power adjustment and corresponding signal and process also 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
very, D
even], 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
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
compare the 18 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
* veryexpression is to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
verythe 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; D
* evenexpression is to the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe 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) robust wireless digital broadcast signal transmitter Insert service index series after training sequence forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing robust wireless digital broadcast signal transmitter; 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 of training sequence discrete sample block;
7) 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;
8) 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;
9) robust wireless digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) 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;
11) 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 architectural characteristic of training sequence characteristic and 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: described training sequence is comprised of the first training sequence and the second training sequence; The first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix that the new sequence that produces and length thereof are G and form; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A.
3. by the Robust method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: described C gets 1/16 of K; Described G gets 1/8 of L.
4. by the Robust method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: described operational indicator sequence has pseudo-random characteristics, by one group of Phase shift m sequence, realized.
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, the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz; 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.
6. 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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