CN102271116A - Anti-fading multimedia wireless broadcast signal framing modulation method - Google Patents
Anti-fading multimedia wireless broadcast signal framing modulation method Download PDFInfo
- Publication number
- CN102271116A CN102271116A CN201110250470XA CN201110250470A CN102271116A CN 102271116 A CN102271116 A CN 102271116A CN 201110250470X A CN201110250470X A CN 201110250470XA CN 201110250470 A CN201110250470 A CN 201110250470A CN 102271116 A CN102271116 A CN 102271116A
- Authority
- CN
- China
- Prior art keywords
- time domain
- modulation data
- coding modulation
- radio broadcast
- sequence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses an anti-fading multimedia wireless broadcast signal framing modulation method, which is a time domain/frequency domain hybrid framing modulation scheme. The anti-fading multimedia wireless broadcast signal framing modulation method has the advantages of low peak-to-average power ratio, short synchronization time, anti-fading 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-fading multi-media radio broadcast singal 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, wideband wireless local area network, 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.
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 wireless broadcast communication systematic function is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Multi-media radio broadcast signal transmission machine framing modulator approach is to realize the key technology of the anti-fading multi-media radio broadcasting of reliable digit TV.
Utilizing digital TV multimedia radio 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-fading multi-media radio broadcast 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-fading multi-media radio broadcast singal framing modulator approach, can satisfy the needs of the anti-fading multi-media radio broadcast transmitted 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?andEmerging?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.
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 the anti-fading multi-media radio broadcast issue of High Data Rate may command multi-service Digital Television, proposed a kind of anti-fading multi-media radio broadcast singal framing modulator approach.
A kind of anti-fading multi-media radio broadcast singal framing modulator approach that the present invention proposes is characterized in that it comprises the following steps:
1) anti-fading multi-media radio broadcast signal transmission machine is with the input data bit of oneself the RS coding (Reed-Solomon that flows through, RS), convolutional interleave, multi code Rate of Chinese character form the cascade interweaved coding modulation data piece of FFT after deleting surplus convolutional encoding, code element modulation, symbol interleave on frequency domain, FFT represents the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
2) anti-fading multi-media radio broadcast signal transmission machine 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) anti-fading multi-media radio broadcast signal transmission machine 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) anti-fading multi-media radio broadcast signal transmission machine 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) anti-fading multi-media radio broadcast signal transmission machine 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-fading multi-media radio broadcast signal transmission machine;
6) anti-fading multi-media radio broadcast signal transmission machine 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 the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 * X of training sequence discrete sample block;
7) anti-fading multi-media radio broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame;
8) anti-fading multi-media radio broadcast signal transmission machine at interval is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame with Cyclic Prefix as protection, to form signal frame, the length of Cyclic Prefix is C;
9) anti-fading multi-media radio broadcast signal transmission machine adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) anti-fading multi-media radio broadcast signal transmission machine with the baseband signal up-conversion to carrier wave.
Anti-fading multi-media radio broadcast singal framing modulator approach according to above-mentioned is characterized in that: anti-fading multi-media radio broadcast signal transmission machine 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; Have periodic time domain in the signal frame of anti-fading multi-media radio broadcast signal transmission machine and embed training sequence discrete sample block; The length X of the training sequence of anti-fading multi-media radio broadcast signal transmission machine 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 anti-fading multi-media radio broadcast signal transmission machine, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of anti-fading multi-media radio broadcast signal transmission machine have orthogonality each other; Each different operational indicator sequence of anti-fading multi-media radio broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing anti-fading multi-media radio broadcast signal transmission machine; The encoding rate that multi code Rate of Chinese character is deleted surplus convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; 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; 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.Have periodic time domain in the signal frame of anti-fading multi-media radio broadcast signal transmission machine and embed training sequence discrete sample block, the training sequence of anti-fading multi-media radio broadcast signal transmission machine, the operational indicator sequence has pseudo-random characteristics, the training sequence of anti-fading multi-media radio broadcast signal transmission machine, the operational indicator sequence has orthogonality each other, it is by falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece that the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls in the time domain embedding training sequence of anti-fading multi-media radio broadcast signal transmission machine, time domain embeds training sequence discrete sample block and directly superposes and form, and these have guaranteed that anti-fading multi-media radio 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 the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, can reduce the interference effect between the adjacent signals frame to form signal 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.Each different operational indicator sequence of anti-fading multi-media radio broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing anti-fading multi-media radio broadcast signal transmission machine, the anti-fading multi-media radio broadcast 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-fading multi-media radio broadcast transmitted of high cascade 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-fading multi-media radio broadcast singal framing modulator approach of the present invention.
Fig. 2 is the embodiment schematic diagram according to certain transmitter signal framing modulation of anti-fading multi-media radio broadcast singal 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-fading multi-media radio broadcast singal 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-fading multi-media radio broadcast signal transmission machine 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, multi code Rate of Chinese character are deleted surplus convolutional encoding, code element modulation, symbol interleave on frequency domain, 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 that multi code Rate of Chinese character is deleted surplus convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; 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; Symbol interleave adopts the random interleaving mode.
2) this certain anti-fading multi-media radio broadcast signal transmission machine 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) this certain anti-fading multi-media radio broadcast signal transmission machine 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) this certain anti-fading multi-media radio broadcast signal transmission machine 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) this certain anti-fading multi-media radio broadcast signal transmission machine 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-fading multi-media radio broadcast signal transmission machine, and X gets 512,1024, in 2048 one;
6) this certain anti-fading multi-media radio broadcast signal transmission machine 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 the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete 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-fading multi-media radio broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame;
8) this certain anti-fading multi-media radio broadcast signal transmission machine at interval is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame 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-fading multi-media radio broadcast signal transmission machine adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) this certain anti-fading multi-media radio broadcast signal transmission machine with the baseband signal up-conversion to carrier wave.
Embodiment according to certain transmitter signal framing of anti-fading multi-media radio broadcast singal framing modulator approach of the present invention is modulated, as shown in Figure 2, specifically implement as follows:
This certain anti-fading multi-media radio broadcast signal transmission machine is with flow through RS coding of the input data bit of oneself, convolutional interleave, multi code Rate of Chinese character is deleted surplus convolutional encoding, the code element modulation, on frequency domain, form the cascade interweaved coding modulation data piece of FFT after the symbol interleave, 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 that multi code Rate of Chinese character is deleted surplus convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; 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; Symbol interleave adopts the random interleaving mode.
The cascade interweaved coding modulation data piece of FFT is made up of subcarrier.The length of the cascade interweaved coding modulation data piece of FFT 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-fading multi-media radio broadcast signal transmission machine 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-fading multi-media radio broadcast signal transmission machine 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-fading multi-media radio broadcast signal transmission machine.
This certain anti-fading multi-media radio broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame; Embed training sequence in time domain and fall and insert Cyclic Prefix in the cascade interweaved coding modulation data sample value of the peak-to-average power ratio time domain discrete 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-fading multi-media radio broadcast signal transmission machine 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-fading multi-media radio broadcast singal framing modulator approach is characterized in that it comprises the following steps:
1) anti-fading multi-media radio broadcast signal transmission machine 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, multi code Rate of Chinese character are deleted surplus convolutional encoding, code element modulation, symbol interleave on frequency domain, RS represents Reed-Solomon, FFT represents the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
2) anti-fading multi-media radio broadcast signal transmission machine 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) anti-fading multi-media radio broadcast signal transmission machine 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) anti-fading multi-media radio broadcast signal transmission machine 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) anti-fading multi-media radio broadcast signal transmission machine 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-fading multi-media radio broadcast signal transmission machine;
6) anti-fading multi-media radio broadcast signal transmission machine 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 the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 * X of training sequence discrete sample block;
7) anti-fading multi-media radio broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame;
8) anti-fading multi-media radio broadcast signal transmission machine at interval is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame with Cyclic Prefix as protection, to form signal frame, the length of Cyclic Prefix is C;
9) anti-fading multi-media radio broadcast signal transmission machine adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) anti-fading multi-media radio broadcast signal transmission machine with the baseband signal up-conversion to carrier wave.
2. by the anti-fading multi-media radio broadcast singal 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-fading multi-media radio broadcast signal transmission machine, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the anti-fading multi-media radio broadcast singal 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-fading multi-media radio broadcast singal 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-fading multi-media radio broadcast singal framing modulator approach 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, 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-fading multi-media radio broadcast singal 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. by the anti-fading multi-media radio broadcast singal framing modulator approach of claim 1, it is characterized in that: the encoding rate that described multi code Rate of Chinese character is deleted surplus convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; 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; Symbol interleave adopts the random interleaving mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110250470XA CN102271116A (en) | 2011-08-22 | 2011-08-22 | Anti-fading multimedia wireless broadcast signal framing modulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110250470XA CN102271116A (en) | 2011-08-22 | 2011-08-22 | Anti-fading multimedia wireless broadcast signal framing modulation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102271116A true CN102271116A (en) | 2011-12-07 |
Family
ID=45053281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110250470XA Pending CN102271116A (en) | 2011-08-22 | 2011-08-22 | Anti-fading multimedia wireless broadcast signal framing modulation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102271116A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763247A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Anti-fading multi-media wireless radio signal framing modulation method |
| CN103763252A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Anti-fading multi-media mobile radio signal framing modulation method |
| WO2020186424A1 (en) * | 2019-03-18 | 2020-09-24 | Zte Corporation | Systems and methods for conjugate data modulation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1567763A (en) * | 2003-07-09 | 2005-01-19 | 北京三星通信技术研究有限公司 | Method and apparatus for reducing peak-to-average ratio of OFDM system using pilot frequency symbol sequence |
| CN1885846A (en) * | 2006-05-22 | 2006-12-27 | 北京北方烽火科技有限公司 | Orthogonal frequency-division multiplexing system and selective mapping transmitting and receiving method |
| CN101005478A (en) * | 2007-01-18 | 2007-07-25 | 西安电子科技大学 | Matrix block interveaving method and device for reducing OFDM system peak-to-average power ratio |
| CN101383808A (en) * | 2008-10-27 | 2009-03-11 | 宁波大学 | Digital television ground broadcast transmitter modulation method based on embedded training sequence and BICM |
| CN101383804A (en) * | 2008-10-27 | 2009-03-11 | 宁波大学 | Digital television ground broadcast transmitter modulation method having time-domain training sequence and BICM |
| CN101783781A (en) * | 2010-02-05 | 2010-07-21 | 华中科技大学 | Information transmission method for lowering peak to average power ratio of OFDM system signal |
-
2011
- 2011-08-22 CN CN201110250470XA patent/CN102271116A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1567763A (en) * | 2003-07-09 | 2005-01-19 | 北京三星通信技术研究有限公司 | Method and apparatus for reducing peak-to-average ratio of OFDM system using pilot frequency symbol sequence |
| CN1885846A (en) * | 2006-05-22 | 2006-12-27 | 北京北方烽火科技有限公司 | Orthogonal frequency-division multiplexing system and selective mapping transmitting and receiving method |
| CN101005478A (en) * | 2007-01-18 | 2007-07-25 | 西安电子科技大学 | Matrix block interveaving method and device for reducing OFDM system peak-to-average power ratio |
| CN101383808A (en) * | 2008-10-27 | 2009-03-11 | 宁波大学 | Digital television ground broadcast transmitter modulation method based on embedded training sequence and BICM |
| CN101383804A (en) * | 2008-10-27 | 2009-03-11 | 宁波大学 | Digital television ground broadcast transmitter modulation method having time-domain training sequence and BICM |
| CN101783781A (en) * | 2010-02-05 | 2010-07-21 | 华中科技大学 | Information transmission method for lowering peak to average power ratio of OFDM system signal |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763247A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Anti-fading multi-media wireless radio signal framing modulation method |
| CN103763252A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Anti-fading multi-media mobile radio signal framing modulation method |
| WO2020186424A1 (en) * | 2019-03-18 | 2020-09-24 | Zte Corporation | Systems and methods for conjugate data modulation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102255699B (en) | Method for framing and modulating anti-fading wireless multimedia broadcast signals | |
| CN102299890B (en) | Multimedia broadcasting wireless signal anti-interference framing modulation method | |
| CN102255859A (en) | Anti-fading digital mobile broadcast signal transmission method | |
| CN102307171B (en) | Anti-interference wireless multimedia broadcast signal framing modulation method | |
| CN102255698B (en) | Anti-fading framing modulating method for multimedia broadcast radio signal | |
| CN102271116A (en) | Anti-fading multimedia wireless broadcast signal framing modulation method | |
| CN102271118B (en) | Robust multimedia wireless broadcast signal framing modulation method | |
| CN102271117B (en) | Anti-interference multimedia wireless broadcast signal framing modulation method | |
| CN102255849B (en) | Robust method for framing and modulating wireless multimedia broadcast signal | |
| CN102255860B (en) | Anti-interference digital mobile broadcasting signal transmission method | |
| CN102291358B (en) | Robust multi-media mobile broadcast signal framing modulation method | |
| CN102281231A (en) | Multimedia broadcast mobile signal anti-interference framing modulation method | |
| CN102255852B (en) | Anti-fading wireless digital broadcast signal transmitting method | |
| CN102271111B (en) | Anti-fading mobile multimedia broadcasting signal framing modulation method | |
| CN102255861B (en) | Robust digital mobile broadcast signal transmitting method | |
| CN102263760B (en) | Anti-noise multimedia wireless broadcast signal framing modulation method | |
| CN102281238B (en) | Anti-fading method for transmitting digital wireless broadcast signal | |
| CN102281235B (en) | Anti-interference method for modulating mobile multimedia broadcast signal by framing | |
| CN102291354B (en) | Anti-interference digital radio broadcast signal transmission method | |
| CN102281239B (en) | Anti-interference multimedia mobile broadcast signal framing modulation method | |
| CN102291353B (en) | Method for transmitting robust digital radio broadcast signal | |
| CN102281234A (en) | Multimedia broadcast mobile signal anti-fading framing modulation method | |
| CN102271112B (en) | Framing modulating method for robust mobile multimedia broadcast signal | |
| CN102255854B (en) | Anti-interference method for transmitting wireless digital broadcast signal | |
| CN102263754B (en) | Anti-interference transmission method of mobile digital broadcast signals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20111207 |