CN102281234A - Multimedia broadcast mobile signal anti-fading framing modulation method - Google Patents
Multimedia broadcast mobile signal anti-fading framing modulation method Download PDFInfo
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Abstract
The invention discloses a multimedia broadcast mobile signal anti-fading framing modulation method and in particular relates to a framing modulation scheme with mixing of time domains and frequency domains. The multimedia broadcast mobile signal anti-fading framing modulation method has the advantages that the peak-average power ratio is low, the synchronization time is short, the fading resistance is achieved, and the multiple services can be controlled and the like.
Description
Technical field
The invention belongs to moving communicating field, relate more specifically to the anti-fading framing modulator approach of a kind of multimedia broadcasting movable signal.
Background technology
Digital TV multimedia broadcasts mobile correlation technique and related industry is that development is very fast in the Communications And Computer field, the industry of good market prospect.The anti-fading transmitter framing of multimedia broadcasting movable signal modulation technique is the key technology of digital TV multimedia 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 of 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 TV multimedia broadcasting mobile transmission system in the time of can resisting frequency selectivity and channel.
Peak-to-average power ratio (PAPR) pair amplifier that ofdm signal is higher and the range of linearity of digital to analog converter have very high requirement, 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, so that in equaling or exceeding the symbol sebolic addressing of minimum free distance, obtain independent decline.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 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 TV multimedia broadcast mobile communication systematic function is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.The anti-fading transmitter framing of multimedia broadcasting movable signal modulator approach is to realize the key technology of the mobile transmission of reliable digit television multimedia broadcasting.
Utilizing digital TV multimedia broadcasting mobile transmission system that may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service are provided is embodiments that digital TV multimedia 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 the anti-fading framing modulator approach of a kind of multimedia broadcasting movable signal, can satisfy the broadcasting of High Data Rate may command multi-service digital TV multimedia 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.Li?ss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stationary?portable?and?mobile?use，”Proceedings?of?the?IEEE，SpecialIssue?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 may command multi-service digital TV multimedia and broadcast mobile transmission problem, proposed the anti-fading framing modulator approach of a kind of multimedia broadcasting movable signal.
The anti-fading framing modulator approach of a kind of multimedia broadcasting movable signal that the present invention proposes is characterized in that it comprises the following steps:
1) the anti-fading transmitter of multimedia broadcasting movable signal is with the input data bit of oneself the RS coding (Reed-Solomon that flows through, RS), convolutional interleave, LDPC (the Low Density Parity Check that encodes, LDPC), on frequency domain, form the cascade interweaved coding modulation data piece of FFT 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;
2) the anti-fading transmitter of multimedia broadcasting movable signal 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;
3) the anti-fading transmitter of multimedia broadcasting movable signal 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];
4) the anti-fading transmitter of multimedia broadcasting movable signal 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 again new cascade interweaved coding modulation data sample value of time domain discrete piece D
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;
5) the anti-fading transmitter of multimedia broadcasting movable signal 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;
6) the anti-fading transmitter of multimedia broadcasting movable signal with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is provided with the imaginary part sequence of the set operational indicator sequence in unit as sequence of plural training, on time domain, constitute 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 all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of multimedia broadcasting movable signal;
7) the anti-fading transmitter of multimedia broadcasting movable signal will repeat 2 times continuously and form time domain repetition training series of discrete sample value piece on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, as frame head;
8) the anti-fading transmitter of multimedia broadcasting movable signal 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;
9) the anti-fading transmitter of multimedia broadcasting movable signal adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) the anti-fading transmitter of multimedia broadcasting movable signal with the baseband signal up-conversion to carrier wave.
According to the anti-fading framing modulator approach of above-mentioned multimedia broadcasting movable signal, it is characterized in that: the anti-fading transmitter of multimedia broadcasting movable signal 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 the anti-fading transmitter of multimedia broadcasting movable signal; The length X of the training sequence of the anti-fading transmitter of multimedia broadcasting movable signal is in 512,1024,2048, the length K of the cascade interweaved coding modulation data piece of corresponding FFT is respectively 2048,4096,8192, the frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively 1/4,1/8,1/16 of the cascade interweaved coding modulation data block length of FFT K size; The training sequence of the anti-fading transmitter of multimedia broadcasting movable signal, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of the anti-fading transmitter of multimedia broadcasting movable signal have orthogonality each other; Each different operational indicator sequence of the anti-fading transmitter of multimedia broadcasting movable signal is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of multimedia broadcasting movable signal; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts the random interleaving mode; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts the random interleaving mode.
Characteristics of the present invention:
The present invention is the framing modulation scheme 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 make full use 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 being adopted 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 the anti-fading transmitter of multimedia broadcasting movable signal, the training sequence of the anti-fading transmitter of multimedia broadcasting movable signal, the operational indicator sequence has pseudo-random characteristics, the training sequence of the anti-fading transmitter of multimedia broadcasting movable signal, the operational indicator sequence has orthogonality each other, the signal frame of the anti-fading transmitter of multimedia broadcasting movable signal is that frame head is inserted into that to fall the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame and forming by time domain repetition training series of discrete sample value piece, and these have guaranteed that the anti-fading receiver of multimedia broadcasting movable signal 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 mobile multimedia broadcast signal is provided with code element.Each different operational indicator sequence of the anti-fading transmitter of multimedia broadcasting movable signal is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of multimedia broadcasting movable signal, digital TV multimedia broadcasting mobile transmission system can satisfy social needs so that can provide may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service.Framing modulator approach 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 the broadcasting of high cascade interweaving encoding modulation data rate may command multi-service digital TV multimedia to move plurality of advantages such as transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to certain transmitter of the anti-fading framing modulator approach of multimedia broadcasting movable signal of the present invention.
Fig. 2 is the embodiment schematic diagram according to certain transmitter signal framing modulation of the anti-fading framing modulator approach of multimedia broadcasting movable signal of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
The embodiment of certain transmitter of the anti-fading framing modulator approach of multimedia broadcasting movable signal that proposes according to the present invention as shown in Figure 1, follows these steps to carry out:
1) the anti-fading transmitter of this certain multimedia broadcasting movable signal is with the input data bit of oneself the RS coding (Reed-Solomon that flows through, RS), convolutional interleave, LDPC (the Low Density Parity Check that encodes, LDPC), on frequency domain, form the cascade interweaved coding modulation data piece of FFT after code element modulation and code element rotation, the symbol interleave, FFT represents the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts the random interleaving mode;
2) the anti-fading transmitter of this certain multimedia broadcasting movable signal 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;
3) the anti-fading transmitter of this certain multimedia broadcasting movable signal 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];
4) the anti-fading transmitter of this certain multimedia broadcasting movable signal 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 again new cascade interweaved coding modulation data sample value of time domain discrete piece D
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;
5) the anti-fading transmitter of multimedia broadcasting movable signal 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;
6) the anti-fading transmitter of multimedia broadcasting movable signal is with the real part sequence of training sequence as sequence of plural training, the operational indicator sequence is provided with the imaginary part sequence of the set operational indicator sequence in unit as sequence of plural training, on time domain, constitute the discrete sample block of sequence of plural training, training sequence, the operational indicator sequence, the length of the discrete sample block of sequence of plural training all is X, the operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of multimedia broadcasting movable signal, and X gets 512,1024, in 2048 one; When X got 512, K got 2048, and C 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, and C 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, and C gets 1/16 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of FFT subcarrier is got 1KHz;
7) the anti-fading transmitter of multimedia broadcasting movable signal will repeat 2 times continuously and form time domain repetition training series of discrete sample value piece on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, as frame head;
8) the anti-fading transmitter of multimedia broadcasting movable signal 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;
9) the anti-fading transmitter of this certain multimedia broadcasting movable signal adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) the anti-fading transmitter of this certain multimedia broadcasting movable signal with the baseband signal up-conversion to carrier wave.
Embodiment according to certain transmitter signal framing of the anti-fading framing modulator approach of multimedia broadcasting movable signal of the present invention is modulated, as shown in Figure 2, specifically implement as follows:
The anti-fading transmitter of this certain multimedia broadcasting movable signal is with flow through RS coding of the input data bit of oneself, convolutional interleave, the LDPC coding, code element modulation and code element rotation, on frequency domain, form the cascade interweaved coding modulation data piece of FFT 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; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts the random interleaving mode.
The anti-fading transmitter of this certain multimedia broadcasting movable signal 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.
The anti-fading transmitter of this certain multimedia broadcasting movable signal with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is provided with the imaginary part sequence of the set operational indicator sequence in unit as sequence of plural training, on time domain, constitute 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 all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of multimedia broadcasting movable signal.
The anti-fading transmitter of this certain multimedia broadcasting movable signal will repeat 2 times continuously and form time domain repetition training series of discrete sample value piece on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, as frame head.
The anti-fading transmitter of this certain multimedia broadcasting movable signal is that frame head is inserted into that to fall the discrete cascade interweaving encoding modulating data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame with time domain repetition training series of discrete sample value piece, to form signal frame.
The anti-fading transmitter of this certain multimedia broadcasting movable signal adopts square root raised cosine filter that the signal pulse of signal frame is shaped.
The anti-fading transmitter of this certain multimedia broadcasting movable signal with the baseband signal up-conversion to carrier wave.
The X of the anti-fading transmitter of this certain multimedia broadcasting movable signal gets in 512,1024,2048; When X got 512, K got 2048, and C 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, and C 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, and C gets 1/16 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of FFT subcarrier is got 1KHz; Training sequence, operational indicator sequence as the anti-fading transmitter of multimedia broadcasting movable signal 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 the anti-fading transmitter of multimedia broadcasting movable signal.When X got 512, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.1; When X got 1024, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.05; When X got 2048, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.025.
In conjunction with the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to the foregoing description, 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 (7)
1. the anti-fading framing modulator approach of multimedia broadcasting movable signal is characterized in that it comprises the following steps:
1) the anti-fading transmitter of multimedia broadcasting movable signal is flowed through the input data bit of oneself and is formed the cascade interweaved coding modulation data piece of FFT after RS coding, convolutional interleave, LDPC coding, code element modulation and code element rotation, the symbol interleave on frequency domain, RS represents Reed-Solomon, LDPC represents Low Density Parity Check, FFT represents the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
2) the anti-fading transmitter of multimedia broadcasting movable signal 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;
3) the anti-fading transmitter of multimedia broadcasting movable signal 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];
4) the anti-fading transmitter of multimedia broadcasting movable signal 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 again new cascade interweaved coding modulation data sample value of time domain discrete piece D
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;
5) the anti-fading transmitter of multimedia broadcasting movable signal 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;
6) the anti-fading transmitter of multimedia broadcasting movable signal with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is provided with the imaginary part sequence of the set operational indicator sequence in unit as sequence of plural training, on time domain, constitute 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 all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of multimedia broadcasting movable signal;
7) the anti-fading transmitter of multimedia broadcasting movable signal will repeat 2 times continuously and form time domain repetition training series of discrete sample value piece on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, as frame head;
8) the anti-fading transmitter of multimedia broadcasting movable signal 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;
9) the anti-fading transmitter of multimedia broadcasting movable signal adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) the anti-fading transmitter of multimedia broadcasting movable signal with the baseband signal up-conversion to carrier wave.
2. by the anti-fading framing modulator approach of multimedia broadcasting movable signal of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of the anti-fading transmitter of described multimedia broadcasting movable signal, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the anti-fading framing modulator approach of multimedia broadcasting movable signal of claim 2, it is characterized in that: described training sequence, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics.
4. by the anti-fading framing modulator approach of multimedia broadcasting movable signal of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the anti-fading framing modulator approach of multimedia broadcasting movable 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; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts the random interleaving mode.
6. by the anti-fading framing modulator approach of multimedia broadcasting movable signal 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, K got 2048, and the frequency interval of subcarrier is got 4KHz; When X got 1024, K got 4096, and the frequency interval of subcarrier is got 2KHz; When X got 2048, K got 8192, and the frequency interval of subcarrier is got 1KHz.
7. by the anti-fading framing modulator approach of multimedia broadcasting movable signal of claim 1, it is characterized in that: the length C value of described Cyclic Prefix is relevant with the X value; When X got 512, C got 1/4 of K size; When X got 1024, C got 1/8 of K size; When X got 2048, C got 1/16 of K size.
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| CN103780556A (en) * | 2014-01-13 | 2014-05-07 | 宁波大学 | Movable signal anti-fading framing modulation method in multimedia broadcasting |
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