CN102281232B - Multimedia broadcast mobile signal anti-noise framing modulation method - Google Patents
Multimedia broadcast mobile signal anti-noise framing modulation method Download PDFInfo
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- CN102281232B CN102281232B CN 201110246943 CN201110246943A CN102281232B CN 102281232 B CN102281232 B CN 102281232B CN 201110246943 CN201110246943 CN 201110246943 CN 201110246943 A CN201110246943 A CN 201110246943A CN 102281232 B CN102281232 B CN 102281232B
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- 238000009432 framing Methods 0.000 title claims abstract description 25
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Abstract
The invention discloses a multimedia broadcast mobile signal anti-noise framing modulation method, and belongs to a time domain and frequency domain mixed framing modulation scheme. The multimedia broadcast mobile signal anti-noise framing modulation method has the advantages of low peak-to-average power ratio, short synchronous time, noise resistance, controllable multi-service and the like.
Description
Technical field
The invention belongs to moving communicating field, relate more specifically to a kind of multimedia broadcasting movable signal antinoise framing modulator approach.
Background technology
At present, television broadcasting develops to the digitlization direction gradually from simulation.Digital TV multimedia broadcasting mobile transmission system, as the important component part of Digital Television Mobile Multimedia 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 TV multimedia broadcasts mobile correlation technique and related industry is that development is very fast in the Communications And Computer field, the industry of good market prospect.Mobile relevant technical in digital TV multimedia broadcasting, the emphasis of various countries' concern at present is that the digital TV multimedia broadcasting mobile transmission system how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Multimedia broadcasting movable signal antinoise transmitter framing modulation technique is the key technology of digital TV multimedia broadcasting mobile system, for whole system performance decisive role, is the object of everybody primary study.
Because the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes becoming more and more easier.Because OFDM multi-carrier transmission technology has simple in structure, the availability of frequency spectrum high plurality of advantages such as becomes and extremely everybody concern and obtain deep research and the extensive use in numerous areas such as Xdsl, wide-band mobile communication, broadband mobile LAN, digital TV multimedia broadcasting mobile transmission system in the time of can resisting frequency selectivity and channel.
The higher peak-to-average power ratio (PAPR) of ofdm signal has very high requirement to the range of linearity of amplifier and digital to analog converter, if the system linearity scope can not satisfy the variation of signal, then can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between the subchannel to be destroyed, produce the phase mutual interference, make system performance degradation.Therefore, the solution that must consider how to reduce the probability of occurrence of big peak power signal in the ofdm signal and reduce the nonlinear distortion influence.
Chnnel coding is the important component part of digital communication system.Along with the develop rapidly of modern information technologies, channel coding technology has become the indispensable technology in modern communications field.Embed redundancy symbol in information sequence, the effect of channel coding technology by redundancy symbol reduces signal and makes a mistake in transmission course, thereby improves the reliability of communication system.(Low Density Parity Check, LDPC) sign indicating number is a kind of in noise transmission channel transmission information and carry out the error correcting code of forward error correction (FEC, Forward Error Correction) to low-density checksum.LDPC coding be a kind of message transmission rate that can make near theoretical maximum, i.e. the encoding scheme of shannon limit.
In the practical communication environment, digital TV multimedia broadcast mobile communication systematic function is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Multimedia broadcasting movable signal antinoise transmitter framing modulator approach is to realize the key technology of the mobile transmission of reliable digit television multimedia broadcasting.
Utilizing digital TV multimedia broadcasting mobile transmission system to provide free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service etc. can control multi-service is the embodiment that digital TV multimedia broadcasting mobile transmission system of new generation satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of multimedia broadcasting movable signal antinoise framing modulator approach, can satisfy the needs that High Data Rate can be controlled the mobile transmission of multi-service digital TV multimedia broadcasting.
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.
M.S.Richer，G.Reitmeier，T.Gurley，G.A.Jones，J.Whitaker，and?R.Rast.“The?ATSC?digital?television?system，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.37-43，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.
Z.Li，L.Chen，L.Zeng，S.Lin，W.Fong，“Efficient?encoding?of?quasi-cyclic?low-density?parity-check?codes，”IEEE?Trans.Commun.，vol.54，no.1，pp.71-81.Jan.2006.
Summary of the invention
The present invention is directed to High Data Rate and can control the multi-service digital TV multimedia and broadcast mobile transmission problem, proposed a kind of multimedia broadcasting movable signal antinoise framing modulator approach.
A kind of multimedia broadcasting movable signal antinoise framing modulator approach that the present invention proposes is characterized in that it comprises the following steps:
1) multimedia broadcasting movable signal antinoise transmitter is flowed through the input data bit of oneself and is formed the FFT coded data block at frequency domain after LDPC coding, code element modulation are rotated with code element, FFT represents the fast discrete Fourier conversion, and the length of FFT coded data block is K; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and the symbol constellations figure mapping mode of code element modulation 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) multimedia broadcasting movable signal antinoise transmitter adopts IFFT that the FFT coded data block is transformed to time domain discrete coded data sample value piece D
Total, IFFT represents the fast discrete Fourier inverse transformation;
3) multimedia broadcasting movable signal antinoise transmitter is divided equally into two with time domain discrete coded data sample value piece in order, the sub-piece D of time domain discrete coded data sample value
1With the sub-piece D of time domain discrete coded data sample value
2, D
Total=[D
1, D
2];
4) multimedia broadcasting movable signal antinoise transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete coded data sample value
1, the sub-piece D of time domain discrete coded data sample value
2Carry out that signal adds, subtracts, conjugate operation is handled and synthetic new time domain discrete coded data sample value piece D again
New, new time domain discrete coded 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 coded 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 coded data sample value piece falls
And peak-to-average power ratio time domain discrete coded 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 coded data sample value
1Each time domain discrete coded data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete coded data sample value that obtains;
5) multimedia broadcasting movable signal antinoise transmitter inserts Cyclic Prefix at interval as protection and falls peak-to-average power ratio time domain discrete coded data sample value piece, the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix falls in formation, as frame, the length of Cyclic Prefix is C, and the length of falling the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix is C+K;
6) multimedia broadcasting movable signal antinoise transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute the discrete sample block of sequence of plural training in time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal antinoise transmitter;
7) discrete sample block of the multimedia broadcasting movable signal antinoise transmitter sequence of plural training that will constitute in time domain repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
8) multimedia broadcasting movable signal antinoise transmitter is that frame head is inserted into that to fall the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
9) multimedia broadcasting movable signal antinoise transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) multimedia broadcasting movable signal antinoise transmitter with the baseband signal up-conversion to carrier wave.
Multimedia broadcasting movable signal antinoise framing modulator approach according to above-mentioned is characterized in that: multimedia broadcasting movable signal antinoise transmitter fall peak-to-average power ratio time domain discrete coded data sample value piece by the signal that the sub-piece of time domain discrete coded data sample value is undertaken by specific 12 kinds of generate patterns add, subtract, conjugate operation is handled and synthetic again; Has periodic time domain repetition training series of discrete sample value piece in the signal frame of multimedia broadcasting movable signal antinoise transmitter; The length X of the training sequence of multimedia broadcasting movable signal antinoise transmitter is in 512,1024,2048, the length K of corresponding FFT coded data block 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 coded data block length K size; The training sequence of multimedia broadcasting movable signal antinoise transmitter, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of multimedia broadcasting movable signal antinoise transmitter have orthogonality each other; Each different operational indicator sequence of multimedia broadcasting movable signal antinoise transmitter is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal antinoise transmitter; The encoding rate that the input data are carried out LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8.
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 coded 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 coded 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 take full advantage of ofdm signal is very low, the real part (or imaginary part) of the ofdm signal when number of sub carrier wave is big is the characteristic of multiple Gaussian random process and whose amplitude obeys Rayleigh distribution, the amount of information of the required extra transmission of adopting of generate pattern is little, be easy to handle the primary signal of recovering to obtain ofdm signal at receiver end, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.Has periodic time domain repetition training series of discrete sample value piece in the signal frame of multimedia broadcasting movable signal antinoise transmitter, the training sequence of multimedia broadcasting movable signal antinoise transmitter, the operational indicator sequence has pseudo-random characteristics, the training sequence of multimedia broadcasting movable signal antinoise transmitter, the operational indicator sequence has orthogonality each other, the signal frame of multimedia broadcasting movable signal antinoise transmitter is that frame head is inserted into that to fall the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame and forming by time domain repetition training series of discrete sample value piece, and these have guaranteed that multimedia broadcasting movable signal antinoise receiver can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic reliably followed the tracks of.Cyclic Prefix is fallen peak-to-average power ratio time domain discrete coded data sample value piece to form signal frame body as the insertion of protection interval, can reduce the interference effect between signal frame head and the frame coded data.Adopt the LDPC coding that the input data are carried out chnnel coding error-correcting performance near shannon limit is provided.The code element modulation is rotated the diversity that mobile multimedia broadcast signal is provided with code element.Each different operational indicator sequence of multimedia broadcasting movable signal antinoise transmitter is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal antinoise transmitter, digital TV multimedia broadcasting mobile transmission system can satisfy social needs so that can provide free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service etc. can control multi-service.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 high coded data rate can control plurality of advantages such as the mobile transmission of multi-service digital TV multimedia broadcasting.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to certain transmitter of multimedia broadcasting movable signal antinoise framing modulator approach of the present invention.
Fig. 2 is the embodiment schematic diagram according to certain transmitter signal framing modulation of multimedia broadcasting movable signal antinoise 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 multimedia broadcasting movable signal antinoise framing modulator approach that proposes according to the present invention as shown in Figure 1, follows these steps to carry out:
1) this certain multimedia broadcasting movable signal antinoise transmitter is flowed through the input data bit of oneself and is formed the FFT coded data block at frequency domain after LDPC coding, code element modulation are rotated with code element, and the length of FFT coded data block is K; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and the symbol constellations figure mapping mode of code element modulation 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; The encoding rate that the input data are carried out LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8;
2) this certain multimedia broadcasting movable signal antinoise transmitter adopts IFFT that the FFT coded data block is transformed to time domain discrete coded data sample value piece D
Total, IFFT represents the fast discrete Fourier inverse transformation;
3) this certain multimedia broadcasting movable signal antinoise transmitter is divided equally into two with time domain discrete coded data sample value piece, the sub-piece D of time domain discrete coded data sample value in order
1With the sub-piece D of time domain discrete coded data sample value
2, D
Total=[D
1, D
2];
4) this certain multimedia broadcasting movable signal antinoise transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete coded data sample value
1, the sub-piece D of time domain discrete coded data sample value
2Carry out that signal adds, subtracts, conjugate operation is handled and synthetic new time domain discrete coded data sample value piece D again
New, new time domain discrete coded 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 coded 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 coded data sample value piece falls
And peak-to-average power ratio time domain discrete coded 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 coded data sample value
1Each time domain discrete coded data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete coded data sample value that obtains;
5) multimedia broadcasting movable signal antinoise transmitter inserts Cyclic Prefix at interval as protection and falls peak-to-average power ratio time domain discrete coded data sample value piece, the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix falls in formation, as frame, the length of Cyclic Prefix is C, and the length of falling the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix is C+K;
6) multimedia broadcasting movable signal antinoise transmitter is with the real part sequence of training sequence as sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute the discrete sample block of sequence of plural training in time domain, 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 multimedia broadcasting movable signal antinoise transmitter, and X gets 512,1024, in 2048 one; When X got 512, K got 2048, C and gets 1/4 of K size, and the frequency interval of FFT coded data block subcarrier is got 4KHz; When X got 1024, K got 4096, C and gets 1/8 of K size, and the frequency interval of FFT coded data block subcarrier is got 2KHz; When X got 2048, K got 8192, C and gets 1/16 of K size, and the frequency interval of FFT coded data block subcarrier is got 1KHz;
7) discrete sample block of the multimedia broadcasting movable signal antinoise transmitter sequence of plural training that will constitute in time domain repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
8) multimedia broadcasting movable signal antinoise transmitter is that frame head is inserted into that to fall the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
9) this certain multimedia broadcasting movable signal antinoise transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) this certain multimedia broadcasting movable signal antinoise transmitter with the baseband signal up-conversion to carrier wave.
Embodiment according to certain transmitter signal framing of multimedia broadcasting movable signal antinoise framing modulator approach of the present invention is modulated, as shown in Figure 2, specifically implement as follows:
This certain multimedia broadcasting movable signal antinoise transmitter is flowed through the input data bit of oneself and is formed the FFT coded data block at frequency domain after LDPC coding, code element modulation are rotated with code element, and the length of FFT coded data block is K; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and the symbol constellations figure mapping mode of code element modulation 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; The encoding rate that the input data are carried out LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8, the FFT coded data block is made up of subcarrier, through IFFT it is transformed to the discrete coded 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 coded 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.
This certain multimedia broadcasting movable signal antinoise transmitter inserts Cyclic Prefix at interval as protection and falls peak-to-average power ratio time domain discrete coded data sample value piece; the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix falls in formation; as frame, the length of Cyclic Prefix is C.
This certain multimedia broadcasting movable signal antinoise transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute the discrete sample block of sequence of plural training in time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal antinoise transmitter.
The discrete sample block of the sequence of plural training that this certain multimedia broadcasting movable signal antinoise transmitter will constitute in time domain repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head.
This certain multimedia broadcasting movable signal antinoise transmitter is that frame head is inserted into that to fall the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame with time domain repetition training series of discrete sample value piece, to form signal frame.
This certain multimedia broadcasting movable signal antinoise transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped.
This certain multimedia broadcasting movable signal antinoise transmitter with the baseband signal up-conversion to carrier wave.
The X of this certain multimedia broadcasting movable signal antinoise transmitter gets in 512,1024,2048; When X got 512, K got 2048, C and gets 1/4 of K size, and the frequency interval of FFT coded data block subcarrier is got 4KHz; When X got 1024, K got 4096, C and gets 1/8 of K size, and the frequency interval of FFT coded data block subcarrier is got 2KHz; When X got 2048, K got 8192, C and gets 1/16 of K size, and the frequency interval of FFT coded data block subcarrier is got 1KHz; Training sequence, operational indicator sequence as multimedia broadcasting movable signal antinoise 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 multimedia broadcasting movable signal antinoise transmitter.When X got 512, the corresponding signal to signal frame carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.1; When X got 1024, the corresponding signal to signal frame carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.05; When X got 2048, the corresponding signal to signal frame carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.025.
By reference to the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to above-described embodiment, under the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.
Claims (5)
1. a multimedia broadcasting movable signal antinoise framing modulator approach is characterized in that it comprises the following steps:
1) multimedia broadcasting movable signal antinoise transmitter is flowed through the input data bit of oneself and is formed the FFT coded data block at frequency domain after LDPC coding, code element modulation are rotated with code element, and LDPC represents low-density checksum, and the length of FFT coded data block is K; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and the symbol constellations figure mapping mode of code element modulation 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) multimedia broadcasting movable signal antinoise transmitter adopts IFFT that the FFT coded data block is transformed to time domain discrete coded data sample value piece D
Total
3) multimedia broadcasting movable signal antinoise transmitter is divided equally into two with time domain discrete coded data sample value piece in order, the sub-piece D of time domain discrete coded data sample value
1With the sub-piece D of time domain discrete coded data sample value
2, D
Total=[D
1, D
2];
4) multimedia broadcasting movable signal antinoise transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete coded data sample value
1, the sub-piece D of time domain discrete coded data sample value
2Carry out that signal adds, subtracts, conjugate operation is handled and synthetic new time domain discrete coded data sample value piece D again
New, new time domain discrete coded 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 coded 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 coded data sample value piece falls
And peak-to-average power ratio time domain discrete coded 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 coded data sample value
1Each time domain discrete coded data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete coded data sample value that obtains;
5) multimedia broadcasting movable signal antinoise transmitter inserts Cyclic Prefix at interval as protection and falls peak-to-average power ratio time domain discrete coded data sample value piece, the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix falls in formation, as frame, the length of Cyclic Prefix is C, and the length of falling the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix is C+K;
6) multimedia broadcasting movable signal antinoise transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute the discrete sample block of sequence of plural training in time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal antinoise transmitter; X gets in 512,1024,2048; When X got 512, K got 2048, C and gets 1/4 of K size; When X got 1024, K got 4096, C and gets 1/8 of K size; When X got 2048, K got 8192, C and gets 1/16 of K size;
7) discrete sample block of the multimedia broadcasting movable signal antinoise transmitter sequence of plural training that will constitute in time domain repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
8) multimedia broadcasting movable signal antinoise transmitter is that frame head is inserted into that to fall the discrete coded data sample value piece of peak-to-average power ratio time domain cyclic prefix be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
9) multimedia broadcasting movable signal antinoise transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) multimedia broadcasting movable signal antinoise transmitter with the baseband signal up-conversion to carrier wave.
2. by the multimedia broadcasting movable signal antinoise framing modulator approach of claim 1, it is characterized in that: described training sequence, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics.
3. by the multimedia broadcasting movable signal antinoise framing modulator approach of claim 1, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
4. by the multimedia broadcasting movable signal antinoise framing modulator approach of claim 1, it is characterized in that: the described encoding rate that the input data are carried out the LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8.
5. by the multimedia broadcasting movable signal antinoise framing modulator approach of claim 1, it is characterized in that: described FFT coded data block is made up of subcarrier; When X got 512, the frequency interval of subcarrier was got 4KHz; When X got 1024, the frequency interval of subcarrier was got 2KHz; When X got 2048, the frequency interval of subcarrier was got 1KHz.
Priority Applications (1)
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| EP1990964A1 (en) * | 2007-05-10 | 2008-11-12 | Thomson Licensing | Method of reducing a peak to average power ratio of a multicarrier signal |
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| CN101778083A (en) * | 2010-03-03 | 2010-07-14 | 宁波大学 | Multimedia broadcast wireless signal single-frequency network anti-noise transmission method |
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| US6130918A (en) * | 1997-12-01 | 2000-10-10 | Nortel Networks Limited | Method and apparatus for reducing the peak-to-average ratio in a multicarrier communication system |
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