CN102281235B - Anti-interference method for modulating mobile multimedia broadcast signal by framing - Google Patents
Anti-interference method for modulating mobile multimedia broadcast signal by framing Download PDFInfo
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Abstract
The invention discloses an anti-interference method for modulating a mobile multimedia broadcast signal by framing, which is a time domain and frequency domain mixed transmission scheme. The anti-interference method for modulating the mobile multimedia broadcast signal by framing has the advantages of low peak-to-average power ratio, short synchronous time, interference resistance, multiple controlled services and the like.
Description
Technical field
The invention belongs to moving communicating field, relate more specifically to a kind of anti-interference mobile multimedia broadcast signal framing modulator approach.
Background technology
At present, television broadcasting develops to the digitlization direction gradually from simulation.Digital television and broadcasting transinission system, as the important component part of digital television broadcasting, its development of technologies, closely bound up with people's quality of life, and therefore be subjected to people's extensive concern especially.Digital television broadcasting correlation technique and related industry thereof are that development is very fast in the Communications And Computer field, the industry of good market prospect.On the digital television broadcasting correlation technique, the emphasis of various countries' concern at present is that the digital television broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.The framing modulation technique is the key technology of digital television broadcasting 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 television broadcasting 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.
Chnnel coding is the important component part of digital communication system.Under multidiameter fading channel, can be by coding, interweave and the 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.BICM technology (Bit Interleave coded modulation, Bit Interleaved Coded Modulation, BICM) adopt bit interleaver and feasible coding and modulated process relatively independent, thereby make and to expand diversity order to different binary bits number from different multi-system symbolic numbers, that is to say that its diversity order L is the smallest hamming distance between the binary code word sequence.Because the BICM technology makes diversity order be improved significantly, therefore, make communication system under multidiameter fading channel, have good bit error performance.
In the practical communication environment, Digital Television Mobile Multimedia Broadcasting communication system performance is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Mobile multimedia broadcast signal transmitter framing modulator approach is to realize the key technology of the anti-interference Mobile Multimedia Broadcasting of reliable digit TV.
Utilizing Digital Television Mobile Multimedia Broadcasting 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 the anti-interference Mobile Multimedia Broadcasting transmission system of Digital Television 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 anti-interference mobile multimedia broadcast signal framing modulator approach, can satisfy the needs of the anti-interference Mobile Multimedia Broadcasting transmission of High Data Rate may command multi-service Digital Television.
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?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?coded?modulation，”IEEE?Trans.Information?Theory，vol.44，no.3，pp.927-946，May?1998.
Summary of the invention
The present invention is directed to the anti-interference Mobile Multimedia Broadcasting problem of High Data Rate may command multi-service Digital Television, proposed a kind of anti-interference mobile multimedia broadcast signal framing modulator approach.
A kind of anti-interference mobile multimedia broadcast signal framing modulator approach that the present invention proposes is characterized in that it comprises the following steps:
1) anti-interference mobile multimedia broadcast signal transmitter is flowed through the input data bit of oneself and is formed FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation and code element rotation on frequency domain, FFT represents the fast discrete Fourier conversion, and the length of FFT Bit Interleave coding modulation data piece is K;
2) anti-interference mobile multimedia broadcast signal transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D
Total, IFFT represents the fast discrete Fourier inverse transformation;
3) anti-interference mobile multimedia broadcast signal transmitter is divided equally into two with time domain discrete Bit Interleave coding modulation data sample value piece in order, the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
1With the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
2, D
Total=[D
1, D
2];
4) anti-interference mobile multimedia broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
1, the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
2Carry out that signal adds, subtracts, conjugate operation is handled and synthetic again new time domain discrete Bit Interleave coding modulation data sample value piece D
New, new time domain discrete Bit Interleave coding modulation data sample value 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 time domain discrete Bit Interleave coding modulation data sample value piece D of 12 kinds of generate patterns
New, choose wherein have a minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls
And peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value 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 time domain discrete Bit Interleave coding modulation data sample value
1Each time domain discrete Bit Interleave coding modulation data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete Bit Interleave coding modulation data sample value that obtains;
5) anti-interference mobile multimedia broadcast signal transmitter 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 anti-interference mobile multimedia broadcast signal transmitter;
6) anti-interference mobile multimedia broadcast signal transmitter will repeat 4 times continuously and form time domain embedding training sequence discrete sample block on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, i.e. K=4 * X of training sequence discrete sample block;
7) anti-interference mobile multimedia broadcast signal transmitter will fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, as frame;
8) anti-interference mobile multimedia broadcast signal transmitter at interval is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece be frame with Cyclic Prefix as protection, to form signal frame, the length of Cyclic Prefix is C;
9) anti-interference mobile multimedia broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) anti-interference mobile multimedia broadcast signal transmitter with the baseband signal up-conversion to carrier wave.
Anti-interference mobile multimedia broadcast signal framing modulator approach according to above-mentioned is characterized in that: anti-interference mobile multimedia broadcast signal transmitter fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece by the signal that the sub-piece of time domain discrete Bit Interleave coding modulation data sample value is undertaken by specific 12 kinds of generate patterns add, subtract, conjugate operation is handled and synthetic again; Have periodic time domain in the signal frame of anti-interference mobile multimedia broadcast signal transmitter and embed training sequence discrete sample block; The length X of the training sequence of anti-interference mobile multimedia broadcast signal transmitter is in 512,1024,2048, the length K of corresponding FFT Bit Interleave coding modulation data piece 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 FFT Bit Interleave coding modulation data block length K size; The training sequence of anti-interference mobile multimedia broadcast signal transmitter, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; The training sequence of anti-interference mobile multimedia broadcast signal transmitter, operational indicator sequence have orthogonality each other; The different operational indicator sequence of each of anti-interference mobile multimedia broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing anti-interference mobile multimedia broadcast signal transmitter; The input data are carried out multi code Rate of Chinese character, and to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8 one; 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.
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 peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece of the present invention and have a minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value 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.Have periodic time domain in the signal frame of anti-interference mobile multimedia broadcast signal transmitter and embed training sequence discrete sample block, the training sequence of anti-interference mobile multimedia broadcast signal transmitter, the operational indicator sequence has pseudo-random characteristics, the training sequence of anti-interference mobile multimedia broadcast signal transmitter, the operational indicator sequence has orthogonality each other, it is by falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece that peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls in the time domain embedding training sequence of anti-interference mobile multimedia broadcast signal transmitter, time domain embeds training sequence discrete sample block and directly superposes and form, and these have guaranteed that anti-interference mobile multimedia broadcast 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 reliably followed the tracks of.Cyclic Prefix is inserted time domain embedding training sequence at interval as protection fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, can reduce the interference effect between the adjacent signals frame to form signal frame.Adopt BICM that the input data are carried out the Bit Interleave coded modulation and 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.The different operational indicator sequence of each of anti-interference mobile multimedia broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing anti-interference mobile multimedia broadcast signal transmitter, the anti-interference Mobile Multimedia Broadcasting transmission system of Digital Television 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 plurality of advantages such as the anti-interference Mobile Multimedia Broadcasting transmission of higher bit interweaving encoding modulation data rate may command multi-service Digital Television.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to certain transmitter of anti-interference mobile multimedia broadcast signal framing modulator approach of the present invention.
Fig. 2 is the embodiment schematic diagram according to certain transmitter signal framing modulation of anti-interference mobile multimedia broadcast signal framing modulator approach 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-interference mobile multimedia broadcast signal framing modulator approach that proposes according to the present invention as shown in Figure 1, follows these steps to carry out:
1) this certain anti-interference mobile multimedia broadcast signal transmitter is flowed through the input data bit of oneself and is formed FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation and code element rotation on frequency domain, FFT represents the fast discrete Fourier conversion, and the length of FFT Bit Interleave coding modulation data piece is K; The input data are carried out multi code Rate of Chinese character deletes surplus convolutional encoding, Bit Interleave, code element modulation and the multi code Rate of Chinese character of code element rotation processing to delete the encoding rate of surplus convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8 one, 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;
2) this certain anti-interference mobile multimedia broadcast signal transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D
Total, IFFT represents the fast discrete Fourier inverse transformation;
3) this certain anti-interference mobile multimedia broadcast signal transmitter is divided equally into two with time domain discrete Bit Interleave coding modulation data sample value piece in order, the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
1With the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
2, D
Total=[D
1, D
2];
4) this certain anti-interference mobile multimedia broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
1, the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
2Carry out that signal adds, subtracts, conjugate operation is handled and synthetic again new time domain discrete Bit Interleave coding modulation data sample value piece D
New, new time domain discrete Bit Interleave coding modulation data sample value 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 time domain discrete Bit Interleave coding modulation data sample value piece D of 12 kinds of generate patterns
New, choose wherein have a minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls
And peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value 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 time domain discrete Bit Interleave coding modulation data sample value
1Each time domain discrete Bit Interleave coding modulation data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete Bit Interleave coding modulation data sample value that obtains;
5) this certain anti-interference mobile multimedia broadcast signal transmitter 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 anti-interference mobile multimedia broadcast signal transmitter, and X gets 512,1024, in 2048 one;
6) this certain anti-interference mobile multimedia broadcast signal transmitter will repeat 4 times continuously and form time domain embedding training sequence discrete sample block on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, i.e. K=4 * X of training sequence discrete sample block; When X got 512, K got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, K got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, K got 8192, and the frequency interval of corresponding subcarrier is got 1KHz;
7) this certain anti-interference mobile multimedia broadcast signal transmitter will fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, as frame;
8) this certain anti-interference mobile multimedia broadcast signal transmitter at interval is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece be frame with Cyclic Prefix as protection, to form signal frame, the length of Cyclic Prefix is C; 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;
9) this certain anti-interference mobile multimedia broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) this certain anti-interference mobile multimedia broadcast signal transmitter with the baseband signal up-conversion to carrier wave.
Embodiment according to certain transmitter signal framing of anti-interference mobile multimedia broadcast signal framing modulator approach of the present invention is modulated, as shown in Figure 2, specifically implement as follows:
This certain anti-interference mobile multimedia broadcast signal transmitter is deleted surplus convolutional encoding with the input data bit of oneself multi code Rate of Chinese character of flowing through, Bit Interleave, the code element modulation forms FFT Bit Interleave coding modulation data piece with code element rotation back on frequency domain, through IFFT it is transformed to the discrete bits interweaving encoding modulating data sample value piece of time domain again, generates by the peak-to-average power ratio adjustment unit and choose the peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value 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 input data are carried out multi code Rate of Chinese character deletes surplus convolutional encoding, Bit Interleave, code element modulation and the multi code Rate of Chinese character of code element rotation processing to delete the encoding rate of surplus convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8 one, 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.FFT Bit Interleave coding modulation data piece is made up of subcarrier.The length of FFT Bit Interleave coding modulation data piece is K; When X got 512, corresponding K got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, corresponding K got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, corresponding K got 8192, and the frequency interval of corresponding subcarrier is got 1KHz.This certain anti-interference mobile multimedia broadcast signal transmitter with training sequence as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, on time domain, constitute the discrete sample block of sequence of plural training, on time domain, it is repeated 4 times continuously again and form time domain embedding training sequence discrete sample block.The length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and X gets in 512,1024,2048, and the length that time domain embeds training sequence discrete sample block is K, K=4 * X.Training sequence, operational indicator sequence as anti-interference mobile multimedia broadcast signal 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 anti-interference mobile multimedia broadcast signal transmitter.This certain anti-interference mobile multimedia broadcast signal transmitter will fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, as frame; Embed training sequence in time domain and fall and insert Cyclic Prefix in the peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece at interval, form signal frame as protection.Length as protection Cyclic Prefix at interval is C; When X got 512, corresponding C got 1/4 of K size; When X got 1024, corresponding C got 1/8 of K size; When X got 2048, corresponding C got 1/16 of K size.This certain anti-interference mobile multimedia broadcast signal transmitter adopts square root raised cosine filter that the signal of signal frame is carried out pulse shaping.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. an anti-interference mobile multimedia broadcast signal framing modulator approach is characterized in that it comprises the following steps:
1) anti-interference mobile multimedia broadcast signal transmitter is flowed through the input data bit of oneself and is formed FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation and code element rotation on frequency domain, and the length of FFT Bit Interleave coding modulation data piece is K;
2) anti-interference mobile multimedia broadcast signal transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D
Total
3) anti-interference mobile multimedia broadcast signal transmitter is divided equally into two with time domain discrete Bit Interleave coding modulation data sample value piece in order, the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
1With the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
2, D
Total=[D
1, D
2];
4) anti-interference mobile multimedia broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
1, the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value
2Carry out that signal adds, subtracts, conjugate operation is handled and synthetic again new time domain discrete Bit Interleave coding modulation data sample value piece D
New, new time domain discrete Bit Interleave coding modulation data sample value piece D
NewAdopt following generate pattern to obtain, generate pattern 1 is D
New=[D
1, D
2], generate pattern 2 is
Generate pattern 3 is
Generate pattern 4 is
Generate pattern 5 is
Generate pattern 6 is
Generate pattern 7 is
Generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the synthetic time domain discrete Bit Interleave coding modulation data sample value piece D of 12 kinds of generate patterns
New, choose wherein have a minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls
And peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value 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 time domain discrete Bit Interleave coding modulation data sample value
1Each time domain discrete Bit Interleave coding modulation data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete Bit Interleave coding modulation data sample value that obtains;
5) anti-interference mobile multimedia broadcast signal transmitter 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 anti-interference mobile multimedia broadcast signal transmitter;
6) anti-interference mobile multimedia broadcast signal transmitter will repeat 4 times continuously and form time domain embedding training sequence discrete sample block on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, i.e. K=4 * X of training sequence discrete sample block;
7) anti-interference mobile multimedia broadcast signal transmitter will fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, as frame;
8) anti-interference mobile multimedia broadcast signal transmitter at interval is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece be frame with Cyclic Prefix as protection, to form signal frame, the length of Cyclic Prefix is C;
9) anti-interference mobile multimedia broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) anti-interference mobile multimedia broadcast signal transmitter with the baseband signal up-conversion to carrier wave.
2. by the anti-interference mobile multimedia broadcast signal framing modulator approach of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described anti-interference mobile multimedia broadcast signal transmitter, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the anti-interference mobile multimedia broadcast signal framing modulator approach 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-interference mobile multimedia broadcast signal framing modulator approach of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the anti-interference mobile multimedia broadcast signal framing modulator approach of claim 1, it is characterized in that: described FFT Bit Interleave coding modulation data piece is made up of subcarrier; When X got 512, sub-carrier number got 2048, and the frequency interval of subcarrier is got 4KHz; When X got 1024, sub-carrier number got 4096, and the frequency interval of subcarrier is got 2KHz; When X got 2048, sub-carrier number got 8192, and the frequency interval of subcarrier is got 1KHz.
6. by the anti-interference mobile multimedia broadcast signal framing modulator approach 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.
7. press the anti-interference mobile multimedia broadcast signal framing modulator approach of claim 1, it is characterized in that: describedly the input data are carried out multi code Rate of Chinese character delete surplus convolutional encoding, Bit Interleave, code element modulation and the multi code Rate of Chinese character of code element rotation processing to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8 one, 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.
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