CN102263765B - Robust transmission method of digital broadcast mobile signals - Google Patents
Robust transmission method of digital broadcast mobile signals Download PDFInfo
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- CN102263765B CN102263765B CN 201110250461 CN201110250461A CN102263765B CN 102263765 B CN102263765 B CN 102263765B CN 201110250461 CN201110250461 CN 201110250461 CN 201110250461 A CN201110250461 A CN 201110250461A CN 102263765 B CN102263765 B CN 102263765B
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Abstract
The invention discloses a robust transmission method of digital broadcast mobile signals, which is a mixed transmission scheme of time domain and frequency domain. The method has the advantages of low PAPR (peak-to-average power ratio), short synchronous time, robustness, multiple controllable services and the like.
Description
Technical field
The invention belongs to moving communicating field, relate more specifically to a kind of digital broadcasting movable signal robust transmission method.
Background technology
Correlation technique is moved in the Digital Television digital broadcasting and related industry is that development is very fast in the Communications And Computer field, the industry of good market prospect.Digital broadcasting movable signal robust transmitter transmission technology is the key technology of Digital Television digital broadcasting mobile system, for whole system performance decisive role, is the object of everybody primary study.Because the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes becoming more and more easier.Because OFDM multi-carrier transmission technology has simple in structure, the availability of frequency spectrum high plurality of advantages such as becomes and extremely everybody concern and obtain deep research and the extensive use in numerous areas such as Xdsl, wide-band mobile communication, broadband mobile LAN, Digital Television digital broadcasting mobile transmission system in the time of can resisting frequency selectivity and channel.
The higher peak-to-average power ratio (PAPR) of ofdm signal 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 big peak power signal in the ofdm signal and reduce the nonlinear distortion influence.
Under multidiameter fading channel, can be by coding, interweave and the cascade optimal design of modulation scheme reaches big 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 make diversity order be improved significantly and under multidiameter fading channel, have the bit error performance of getting well.
In the practical communication environment, Digital Television digital broadcasting performance of mobile communication system is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Digital broadcasting movable signal robust transmitter transmission method is the key technology that realizes the mobile transmission of reliable digit Television Digital broadcasting.
Utilizing Digital Television digital broadcasting mobile transmission system to provide free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service etc. can control multi-service is the embodiment that Digital Television digital broadcasting mobile transmission system of new generation satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of digital broadcasting movable signal robust transmission method, can satisfy High Data Rate and can control the digital broadcasting of multi-service Digital Television and move the needs of transmission.
Desire 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?Issueon?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.Pol?lara，“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 the digital broadcasting of multi-service Digital Television and move transmission problem, proposed a kind of digital broadcasting movable signal robust transmission method.
A kind of digital broadcasting movable signal robust transmission method that the present invention proposes is characterized in that it comprises the following steps:
1) digital broadcasting movable signal 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 handled to form the input data bit flow;
2) digital broadcasting movable signal 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 and code element rotation, the symbol interleave, FFT represents the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) digital broadcasting movable signal 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 movable signal robust transmitter is divided equally into two with the cascade interweaved coding modulation data sample value of time domain discrete piece in order, the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
1With the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
2, D
Total=[D
1, D
2];
5) digital broadcasting movable signal robust transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
1, the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
2Carry out that signal adds, subtracts, conjugate operation is handled 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 the operational indicator sequence unit be set, wherein, D
* 1Expression is to the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
1The cascade interweaved coding modulation data sample value of each time domain discrete carry out that conjugate operation is handled and the sub-piece of the cascade interweaved coding modulation data sample value of time domain discrete that obtains;
6) digital broadcasting movable signal robust transmitter inserts Cyclic Prefix at interval as protection and falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, 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 movable signal robust transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute 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 movable signal robust transmitter;
8) discrete sample block of the digital broadcasting movable signal robust transmitter sequence of plural training that will constitute in time domain repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
9) digital broadcasting movable signal 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 movable signal robust transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) digital broadcasting movable signal robust transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) digital broadcasting movable signal robust receiver detects radiofrequency signal that receiving digital broadcast movable signal robust transmitter sends and its down-conversion is formed baseband signal, utilizes the architectural characteristic of the Cyclic Prefix characteristic of signal frame and signal frame to carry out baseband signal and receives and handle.
Digital broadcasting movable signal robust transmission method according to above-mentioned is characterized in that: digital broadcasting movable signal robust transmitter fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece by the signal that the sub-piece of the cascade interweaved coding modulation data sample value of time domain discrete is undertaken by specific 12 kinds of generate patterns add, subtract, conjugate operation is handled and synthetic again; Has periodic time domain repetition training series of discrete sample value piece in the signal frame of digital broadcasting movable signal robust transmitter; The length X of the training sequence of digital broadcasting movable signal 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 movable signal robust transmitter, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of digital broadcasting movable signal robust transmitter have orthogonality each other; Each different operational indicator sequence of digital broadcasting movable signal robust transmitter is comprising and unique each system parameters and business model information of expressing digital broadcasting movable signal 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, 64QAM and the 256QAM; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol constellations figure mapping mode adopts the Gray code mapping; Symbol interleave adopts the random interleaving mode.Digital broadcasting movable signal robust receiver can take full advantage of the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame is carried out baseband signal reception processing, handles 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 big 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 (or imaginary part) of the ofdm signal when number of sub carrier wave is big is the characteristic of multiple Gaussian random process and whose amplitude obeys Rayleigh distribution, the amount of information of the required extra transmission of adopting of generate pattern is little, be easy to handle 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 movable signal robust transmitter, the training sequence of digital broadcasting movable signal robust transmitter, the operational indicator sequence has pseudo-random characteristics, the training sequence of digital broadcasting movable signal robust transmitter, the operational indicator sequence has orthogonality each other, the signal frame of digital broadcasting movable signal 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 digital broadcasting movable signal robust receiver can realize frame synchronization fast and accurately, 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, make communication system under multidiameter fading channel, have good bit error performance.The code element modulation is rotated the diversity that the mobile digital broadcast signal is provided with code element.Each different operational indicator sequence of digital broadcasting movable signal robust transmitter is comprising and unique each system parameters and business model information of expressing digital broadcasting movable signal robust transmitter, Digital Television digital broadcasting mobile transmission system can satisfy social needs so that can provide free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service etc. can control multi-service.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 digital broadcasting of multi-service Digital Television to move plurality of advantages such as transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to signal transmission between certain transmitter and receiver of digital broadcasting movable signal robust transmission method 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 digital broadcasting movable signal robust transmission method 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 digital broadcasting movable signal robust transmission method that proposes according to the present invention as shown in Figure 1, follows these steps to carry out:
1) this certain digital broadcasting movable signal 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 handled to form the input data bit flow;
2) this certain digital broadcasting movable signal 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 and code element rotation, the symbol interleave, FFT represents the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts the random interleaving mode; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol constellations figure mapping mode adopts the Gray code mapping; Symbol interleave adopts the random interleaving mode;
3) this certain digital broadcasting movable signal 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 movable signal robust transmitter is divided equally into two with the cascade interweaved coding modulation data sample value of time domain discrete piece in order, the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
1With the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
2, D
Total=[D
1, D
2];
5) this certain digital broadcasting movable signal robust transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
1, the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
2Carry out that signal adds, subtracts, conjugate operation is handled 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 the operational indicator sequence unit be set, wherein, D
* 1Expression is to the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
1The cascade interweaved coding modulation data sample value of each time domain discrete carry out that conjugate operation is handled and the sub-piece of the cascade interweaved coding modulation data sample value of time domain discrete that obtains;
6) digital broadcasting movable signal robust transmitter inserts Cyclic Prefix at interval as protection and falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, 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 movable signal robust transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute 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, the operational indicator sequence is comprising and unique each system parameters and business model information of expressing digital broadcasting movable signal robust transmitter, and X 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;
8) discrete sample block of the digital broadcasting movable signal robust transmitter sequence of plural training that will constitute in time domain repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
9) digital broadcasting movable signal 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 movable signal robust transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) this certain digital broadcasting movable signal 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 movable signal robust receiver detects radiofrequency signal that receiving digital broadcast movable 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 baseband signal reception processing, handle 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 digital broadcasting movable signal robust transmission method of the present invention forms, as shown in Figure 2, specifically implement as follows:
This certain digital broadcasting movable signal 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 handled to form the input data bit flow.
This certain digital broadcasting movable signal robust transmitter is with the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code of flowing through, Bit Interleave, the LDPC coding, code element modulation and code element rotation, form the cascade interweaved coding modulation data piece of FFT at frequency domain after the symbol interleave, the length of the cascade interweaved coding modulation data piece of FFT is K, the cascade interweaved coding modulation data piece of FFT is made up 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 the operational indicator sequence unit is set.The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts the random interleaving mode; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol constellations figure mapping mode adopts the Gray code mapping; Symbol interleave adopts the random interleaving mode.
This certain digital broadcasting movable signal robust transmitter inserts Cyclic Prefix at interval as protection and falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece; 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 movable signal robust transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute 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 movable signal robust transmitter.
The discrete sample block of the sequence of plural training that this certain digital broadcasting movable signal robust transmitter will constitute in time domain repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head.
This certain digital broadcasting movable signal 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 movable signal robust transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped.
This certain digital broadcasting movable signal robust transmitter with the baseband signal up-conversion to carrier wave.
The X of this certain digital broadcasting movable signal 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 movable signal robust transmitter are formed by a series of 1 or-1, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.The training sequence that satisfies above-mentioned feature can be by realizing as one group of displacement m sequence of a kind of specific type of pseudo-random number sequence with as the walsh sequence of orthogonal sequence, Hadamard sequences or by the orthogonal sequence that other modes produce.Each different operational indicator sequence is comprising and unique each system parameters and business model information of expressing digital broadcasting movable signal 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 movable signal 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 movable signal robust receiver detects radiofrequency signal that receiving digital broadcast movable 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 baseband signal reception processing, handle comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body.
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, under the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.
Claims (6)
1. a digital broadcasting movable signal robust transmission method is characterized in that it comprises the following steps:
1) digital broadcasting movable signal 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 handled to form the input data bit flow;
2) digital broadcasting movable signal 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 and code element rotation, 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 movable signal 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 movable signal robust transmitter is divided equally into two with the cascade interweaved coding modulation data sample value of time domain discrete piece in order, the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
1With the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
2, D
Total=[D
1, D
2];
5) digital broadcasting movable signal robust transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
1, the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
2Carry out that signal adds, subtracts, conjugate operation is handled 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 the operational indicator sequence unit be set, wherein, D
* 1Expression is to the sub-piece D of the cascade interweaved coding modulation data sample value of time domain discrete
1The cascade interweaved coding modulation data sample value of each time domain discrete carry out that conjugate operation is handled and the sub-piece of the cascade interweaved coding modulation data sample value of time domain discrete that obtains;
6) digital broadcasting movable signal robust transmitter inserts Cyclic Prefix at interval as protection and falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, 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 movable signal robust transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute 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 movable signal robust transmitter; X gets in 512,1024,2048; When X got 512, K got 2048, C and gets 1/4 of K size; When X got 1024, K got 4096, C and gets 1/8 of K size; When X got 2048, K got 8192, C and gets 1/16 of K size;
8) discrete sample block of the digital broadcasting movable signal robust transmitter sequence of plural training that will constitute in time domain repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
9) digital broadcasting movable signal 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 movable signal robust transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) digital broadcasting movable signal robust transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) digital broadcasting movable signal robust receiver detects radiofrequency signal that receiving digital broadcast movable signal robust transmitter sends and its down-conversion is formed baseband signal, utilizes the architectural characteristic of the Cyclic Prefix characteristic of signal frame and signal frame to carry out baseband signal and receives and handle.
2. by the digital broadcasting movable signal robust transmission method of claim 1, it is characterized in that: described training sequence, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics.
3. by the digital broadcasting movable signal robust transmission method of claim 1, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
4. by the digital broadcasting movable signal robust transmission method 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, 64QAM and the 256QAM; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol constellations figure mapping mode adopts the Gray code mapping; Symbol interleave adopts the random interleaving mode.
5. by the digital broadcasting movable signal robust transmission method of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is made up of subcarrier; When X got 512, the frequency interval of subcarrier was got 4KHz; When X got 1024, the frequency interval of subcarrier was got 2KHz; When X got 2048, the frequency interval of subcarrier was got 1KHz.
6. press the digital broadcasting movable signal robust transmission method of claim 1, it is characterized in that: the baseband signal that described digital broadcasting movable signal robust receiver carries out receives to be handled, and one of them step is that the time domain and frequency domain combined alternate analysis of signal frame head and signal frame body is handled.
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