CN102307171B - Anti-interference wireless multimedia broadcast signal framing modulation method - Google Patents
Anti-interference wireless multimedia broadcast signal framing modulation method Download PDFInfo
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Abstract
The invention discloses an anti-interference wireless multimedia broadcast signal framing modulation method, which is a time domain/frequency domain combined framing modulation scheme. The anti-interference wireless multimedia broadcast signal framing modulation method has the advantages of low peak-to-average power ratio, short synchronization time, anti-interference performance, multi-service controllability and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-interference wireless multi-media broadcast signal framing modulator approach.
Background technology
At present, television broadcasting is from simulating gradually to the digitlization future development.Digital television and broadcasting transinission system, as the important component part of digital television broadcasting, the development of its correlation technique, closely bound up with people's quality of life, and therefore be subject 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, various countries' outline is at present, and the digital television broadcasting how to pass under the environment for complex wave provides the cheaply implementation of reliable high-speed mobile.The framing modulation technique is the key technology of digital television broadcasting system, plays conclusive effect for the whole system performance, 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 the OFDM Multicarrier Transmission Technology has simple in structure, the availability of frequency spectrum is high, the plurality of advantages such as becomes in the time of can resisting frequency selectivity and channel and extremely everybody concern and obtain deep research and the extensive use in the numerous areas such as Xdsl, wide-band mobile communication, wideband wireless local area network, digital television broadcasting.
The peak-to-average power ratio that ofdm signal is higher (PAPR) has very high requirement to the range of linearity of amplifier and digital to analog converter, if 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 large peak power signal in the ofdm signal and reduce the nonlinear distortion impact.
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 large 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.BICM technology (Bit Interleave coded modulation, Bit Interleaved Coded Modulation, BICM) adopt bit interleaver and so that coding and modulated process are relatively independent, thereby so that can 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 so that diversity order be improved significantly, therefore so that communication system has good bit error performance under multidiameter fading channel.
In the practical communication environment, Digital Television radio multimedium broadcast communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Wireless multi-media broadcast signal transmitter framing modulator approach is to realize the key technology of reliable digit TV anti-interference wireless multi-media broadcasting.
Utilizing Digital Television radio multimedium broadcast transmission system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital TV anti-interference wireless multi-media broadcast transmission system 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 wireless multi-media broadcast signal framing modulator approach, can satisfy the needs that High Data Rate can be controlled multi-service Digital Television anti-interference wireless multi-media broadcasting transmitting.
Wish 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?mobileuse，”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 High Data Rate and can control multi-service Digital Television anti-interference wireless multi-media broadcast issue, proposed a kind of anti-interference wireless multi-media broadcast signal framing modulator approach.
A kind of anti-interference wireless multi-media broadcast signal framing modulator approach that the present invention proposes is characterized in that it comprises the following steps:
1) the anti-interference wireless multi-media broadcast signal transmitter is flowed through the input data bit of oneself and is formed FFT Bit Interleave coding modulation data piece at frequency domain after multi code Rate of Chinese character is deleted remaining convolutional encoding, Bit Interleave, code element modulation, FFT represents the fast discrete Fourier conversion, and the length of FFT Bit Interleave coding modulation data piece is K;
2) the anti-interference wireless multi-media 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) the anti-interference wireless multi-media broadcast signal transmitter is divided equally into two with time domain discrete Bit Interleave coding modulation data sample value piece in order, time domain discrete Bit Interleave coding modulation data sample value sub-block D
1With time domain discrete Bit Interleave coding modulation data sample value sub-block D
2, D
Total=[D
1, D
2];
4) the anti-interference wireless multi-media broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to time domain discrete Bit Interleave coding modulation data sample value sub-block D
1, time domain discrete Bit Interleave coding modulation data sample value sub-block D
2Carry out that signal adds, subtracts, conjugate operation is processed and synthetic new time domain discrete Bit Interleave coding modulation data sample value piece D again
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 operational indicator sequence setting unit, wherein, D
* 1Expression is to time domain discrete Bit Interleave coding modulation data sample value sub-block D
1Each time domain discrete Bit Interleave coding modulation data sample value carry out that conjugate operation is processed and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains;
5) the anti-interference wireless multi-media broadcast signal transmitter with training sequence as the real part sequence of sequence of plural training, operational indicator sequence that operational indicator sequence setting unit is the set imaginary part sequence as sequence of plural training, consist of 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 the anti-interference wireless multi-media broadcast signal transmitter;
6) discrete sample block of the anti-interference wireless multi-media broadcast signal transmitter sequence of plural training that will consist of in time domain repeats continuously to form time domains 4 times and embeds training sequence discrete sample block on 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) the anti-interference wireless multi-media 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) the anti-interference wireless multi-media broadcast signal transmitter 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 the protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) the anti-interference wireless multi-media broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) the anti-interference wireless multi-media broadcast signal transmitter with the baseband signal up-conversion to carrier wave.
Anti-interference wireless multi-media broadcast signal framing modulator approach according to above-mentioned is characterized in that: the falling that the signal that peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece undertakies by specific 12 kinds of generate patterns by time domain discrete Bit Interleave coding modulation data sample value sub-block adds, subtracts, conjugate operation is processed of anti-interference wireless multi-media broadcast signal transmitter and again synthetic; Have periodic time domain in the signal frame of anti-interference wireless multi-media broadcast signal transmitter and embed training sequence discrete sample block; The length X of the training sequence of anti-interference wireless multi-media 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 wireless multi-media broadcast signal transmitter, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics; The training sequence of anti-interference wireless multi-media broadcast signal transmitter, operational indicator sequence have orthogonality each other; The different operational indicator sequence of each of anti-interference wireless multi-media broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing the anti-interference wireless multi-media broadcast signal transmitter; The input data are carried out multi code Rate of Chinese character, and to delete the encoding rate of remaining 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, 32QAM and the 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
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 large 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 of the ofdm signal when number of sub carrier wave is larger (or imaginary part) is the characteristic of multiple Gaussian random process and whose amplitude obeys Rayleigh distribution, the amount of information of the required extra transmission of generate pattern of adopting is little, be easy to process 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 wireless multi-media broadcast signal transmitter and embed training sequence discrete sample block, the training sequence of anti-interference wireless multi-media broadcast signal transmitter, the operational indicator sequence has pseudo-random characteristics, the training sequence of anti-interference wireless multi-media 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 wireless multi-media broadcast signal transmitter, time domain embeds training sequence discrete sample block and directly superposes and form, and these have guaranteed that the anti-interference wireless multi-media broadcast signal receiver can realize fast and accurately frame synchronization, 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 as the protection interval fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece to form signal frame, can reduce the interference effect between the adjacent signals frame.Adopt BICM that the input data are carried out the Bit Interleave coded modulation and improved diversity order, so that communication system has good bit error performance under multidiameter fading channel.The different operational indicator sequence of each of anti-interference wireless multi-media broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing the anti-interference wireless multi-media broadcast signal transmitter, can so that Digital Television anti-interference wireless multi-media broadcast transmission system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.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 higher bit interweaving encoding modulation data rate can control the plurality of advantages such as multi-service Digital Television anti-interference wireless multi-media broadcasting transmitting.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to certain transmitter of anti-interference wireless multi-media 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 wireless multi-media 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 wireless multi-media 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 wireless multi-media broadcast signal transmitter is flowed through the input data bit of oneself and is formed FFT Bit Interleave coding modulation data piece at frequency domain after multi code Rate of Chinese character is deleted remaining convolutional encoding, Bit Interleave, code element modulation, 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 the multi code Rate of Chinese character of remaining convolutional encoding, Bit Interleave, code element modulation treatment to delete the encoding rate of remaining 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, 32QAM and the 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping;
2) this certain anti-interference wireless multi-media 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 wireless multi-media broadcast signal transmitter is divided equally into two with time domain discrete Bit Interleave coding modulation data sample value piece in order, time domain discrete Bit Interleave coding modulation data sample value sub-block D
1With time domain discrete Bit Interleave coding modulation data sample value sub-block D
2, D
Total=[D
1, D
2];
4) this certain anti-interference wireless multi-media broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to time domain discrete Bit Interleave coding modulation data sample value sub-block D
1, time domain discrete Bit Interleave coding modulation data sample value sub-block D
2Carry out that signal adds, subtracts, conjugate operation is processed and synthetic new time domain discrete Bit Interleave coding modulation data sample value piece D again
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 operational indicator sequence setting unit, wherein, D
* 1Expression is to time domain discrete Bit Interleave coding modulation data sample value sub-block D
1Each time domain discrete Bit Interleave coding modulation data sample value carry out that conjugate operation is processed and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains;
5) this certain anti-interference wireless multi-media broadcast signal transmitter is with the real part sequence of training sequence as sequence of plural training, the operational indicator sequence that operational indicator sequence setting unit is set is as the imaginary part sequence of sequence of plural training, consist of the discrete sample block of sequence of plural training in time domain, 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-interference wireless multi-media broadcast signal transmitter, and X gets 512,1024, in 2048 one;
6) discrete sample block of this certain anti-interference wireless multi-media broadcast signal transmitter sequence of plural training that will consist of in time domain repeats continuously to form time domains 4 times and embeds training sequence discrete sample block on 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 wireless multi-media 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 wireless multi-media broadcast signal transmitter 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 the protection interval, 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 wireless multi-media broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) this certain anti-interference wireless multi-media broadcast signal transmitter with the baseband signal up-conversion to carrier wave.
According to the embodiment that certain transmitter signal framing of anti-interference wireless multi-media broadcast signal framing modulator approach of the present invention is modulated, as shown in Figure 2, implementation is as follows:
This certain anti-interference wireless multi-media broadcast signal transmitter is deleted remaining convolutional encoding with the input data bit of oneself multi code Rate of Chinese character of flowing through, Bit Interleave, form FFT Bit Interleave coding modulation data piece at frequency domain after the code element modulation, 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 operational indicator sequence setting unit.The input data are carried out multi code Rate of Chinese character deletes the multi code Rate of Chinese character of remaining convolutional encoding, Bit Interleave, code element modulation treatment to delete the encoding rate of remaining 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, 32QAM and the 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
FFT Bit Interleave coding modulation data piece is comprised 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 wireless multi-media 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, in the discrete sample block of time domain formation sequence of plural training, on time domain, it is repeated 4 times continuously again and form time domains 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 the anti-interference wireless multi-media broadcast signal transmitter form by a series of 1 or-1, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.The training sequence that satisfies above-mentioned feature can be by realizing as one group of Phase shift 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-interference wireless multi-media broadcast signal transmitter.
This certain anti-interference wireless multi-media 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 as the protection interval, form signal frame.Length as the Cyclic Prefix of protecting the 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 wireless multi-media 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 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.
The above has been described in detail specific embodiments of the invention by reference to the accompanying drawings, but the present invention is not limited to above-described embodiment, and in 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 wireless multi-media broadcast signal framing modulator approach is characterized in that it comprises the following steps:
1) the anti-interference wireless multi-media broadcast signal transmitter is flowed through the input data bit of oneself and is formed FFT Bit Interleave coding modulation data piece at frequency domain after multi code Rate of Chinese character is deleted remaining convolutional encoding, Bit Interleave, code element modulation, and the length of FFT Bit Interleave coding modulation data piece is K;
2) the anti-interference wireless multi-media 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) the anti-interference wireless multi-media broadcast signal transmitter is divided equally into two with time domain discrete Bit Interleave coding modulation data sample value piece in order, time domain discrete Bit Interleave coding modulation data sample value sub-block D
1With time domain discrete Bit Interleave coding modulation data sample value sub-block D
2, D
Total=[D
1, D
2];
4) the anti-interference wireless multi-media broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to time domain discrete Bit Interleave coding modulation data sample value sub-block D
1, time domain discrete Bit Interleave coding modulation data sample value sub-block D
2Carry out that signal adds, subtracts, conjugate operation is processed and synthetic new time domain discrete Bit Interleave coding modulation data sample value piece D again
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 operational indicator sequence setting unit, wherein, D
* 1Expression is to time domain discrete Bit Interleave coding modulation data sample value sub-block D
1Each time domain discrete Bit Interleave coding modulation data sample value carry out that conjugate operation is processed and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains;
5) the anti-interference wireless multi-media broadcast signal transmitter with training sequence as the real part sequence of sequence of plural training, operational indicator sequence that operational indicator sequence setting unit is the set imaginary part sequence as sequence of plural training, consist of 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 the anti-interference wireless multi-media broadcast signal transmitter;
6) discrete sample block of the anti-interference wireless multi-media broadcast signal transmitter sequence of plural training that will consist of in time domain repeats continuously to form time domains 4 times and embeds training sequence discrete sample block on 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) the anti-interference wireless multi-media 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) the anti-interference wireless multi-media broadcast signal transmitter 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 the protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) the anti-interference wireless multi-media broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) the anti-interference wireless multi-media broadcast signal transmitter with the baseband signal up-conversion to carrier wave.
2. by the anti-interference wireless multi-media 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 wireless multi-media broadcast signal transmitter, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the anti-interference wireless multi-media broadcast signal framing modulator approach of claim 2, it is characterized in that: described training sequence, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics.
4. by the anti-interference wireless multi-media 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 wireless multi-media broadcast signal framing modulator approach of claim 1, it is characterized in that: described FFT Bit Interleave coding modulation data piece is comprised 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 wireless multi-media 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 wireless multi-media 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 the multi code Rate of Chinese character of remaining convolutional encoding, Bit Interleave, code element modulation treatment to delete the encoding rate of remaining 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, 32QAM and the 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
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| CN101420408A (en) * | 2008-10-27 | 2009-04-29 | 宁波大学 | Interference resistant modulation method for digital television terrestrial broadcast transmitter |
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