CN102263730B - Mobile signal framing modulation method for multimedia broadcast single-frequency network - Google Patents
Mobile signal framing modulation method for multimedia broadcast single-frequency network Download PDFInfo
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Abstract
The invention discloses a mobile signal framing modulation method for a multimedia broadcast single-frequency network. The mobile signal framing modulation method is a time domain/frequency domain/space domain combined framing modulation scheme. The method has the advantages of low peak-to-average power ratio, short synchronization time, anti-channel fading performance, multi-service controllability and the like.
Description
Technical field
The invention belongs to moving communicating field, relate more specifically to-kind of multimedia broadcasting single frequency network movable signal framing modulator approach.
Background technology
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 Television Mobile Multimedia 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 Digital Television Mobile Multimedia Broadcasting correlation technique, the emphasis of various countries' concern at present is that the Digital Television Mobile Multimedia Broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Multimedia broadcasting movable signal transmitter framing modulation technique is the key technology of Digital Television mobile multimedia broadcast 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 Television Mobile Multimedia Broadcasting 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.
Adopt the networking model (that is, the same time of several transmitting stations is launched same signal to realize the reliable covering to certain coverage in same frequency) of single frequency network can improve the availability of frequency spectrum that digital TV multimedia is broadcasted mobile transmission system greatly.In actual single frequency network 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 single frequency network movable signal transmitter framing modulator approach is to realize that reliable digit television multimedia broadcast single frequency network moves the key technology of transmission.
Utilizing digital TV multimedia broadcast single frequency network 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 single frequency network movable signal framing modulator approach, can satisfy High Data Rate and can control multi-service digital TV multimedia broadcast single frequency network and move the needs of transmission.
Desire is done more deep understanding to the patent background can be with reference to following documents and materials:
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimedia?communications”.Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digital?television?development，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.8-21，Jan.2006.
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.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service digital TV multimedia broadcast single frequency network and move transmission problem, proposed a kind of multimedia broadcasting single frequency network movable signal framing modulator approach.
A kind of multimedia broadcasting single frequency network movable signal framing modulator approach that the present invention proposes is characterized in that it comprises the following steps:
1) the network data management device of single frequency network will be imported flow through code element modulation of data bit and be rotated in code element and form the FFT data block on the frequency domain, and FFT represents the fast discrete Fourier conversion, and the length of FFT data block is K;
2) to adopt code check be that 1 space-frequency coding device will be modulated to each multimedia broadcasting movable signal transmitter branches in the single frequency network in the FFT data block that frequency domain forms and form and emptyly frequently modulate the FFT data block to the network data management device of single frequency network, and the time synchronized of adjusting each multimedia broadcasting movable signal transmitter branches is all modulated the FFT data block frequently to sky at one time and handled to guarantee all transmitters in the network;
3) each multimedia broadcasting movable signal transmitter in the single frequency network adopts IFFT that sky is modulated the FFT data block frequently and is transformed to the empty time domain discrete data sample block D that frequently modulates
Total, IFFT represents the fast discrete Fourier inverse transformation;
4) each multimedia broadcasting movable signal transmitter in the single frequency network is modulated sky frequently time domain discrete data sample block in order and is divided equally into two, the empty sub-piece D of time domain discrete data sample that frequently modulates
1Frequently modulate the sub-piece D of time domain discrete data sample with sky
2, D
Total=[D
1, D
2];
5) each multimedia broadcasting movable signal transmitter in the single frequency network is modulated the sub-piece D of time domain discrete data sample by the peak-to-average power ratio adjustment unit frequently to sky
1, the empty sub-piece D of time domain discrete data sample that frequently modulates
2Carry out that signal adds, subtracts, conjugate operation is handled and the synthetic new empty time domain discrete data sample block D that frequently modulates again
New, the new empty time domain discrete data sample block D that frequently modulates
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
Relatively 12 kinds of synthetic empty frequencies of generate pattern are modulated time domain discrete data sample block D
New, choose the empty frequency of peak-to-average power ratio that falls that wherein has minimum peak-to-average power ratio and modulate time domain discrete data sample block
And the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio will be fallen
The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D
* 1Expression is modulated the sub-piece D of time domain discrete data sample frequently to sky
1Each empty modulate that time domain discrete data sample carries out that conjugate operation is handled frequently and the empty sub-piece of time domain discrete data sample of frequently modulating that obtains;
6) each multimedia broadcasting movable signal transmitter in the single frequency network inserts Cyclic Prefix at interval as protection and falls the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio, the empty time domain cyclic prefix discrete data sample block of frequently modulating of peak-to-average power ratio falls in formation, as frame, the length of Cyclic Prefix is C, and falling the empty length of modulating time domain cyclic prefix discrete data sample block frequently of peak-to-average power ratio is C+K;
7) each multimedia broadcasting movable signal transmitter in the single frequency network 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 transmitter;
8) discrete sample block of the sequence of plural training that will constitute in time domain of each multimedia broadcasting movable signal transmitter in the single frequency network repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
9) each multimedia broadcasting movable signal transmitter in the single frequency network is that frame head is inserted into and falls peak-to-average power ratio empty frequently to modulate time domain cyclic prefix discrete data sample block be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
10) each multimedia broadcasting movable signal transmitter in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) each multimedia broadcasting movable signal transmitter in the single frequency network with the baseband signal up-conversion to carrier wave.
Multimedia broadcasting single frequency network movable signal framing modulator approach according to above-mentioned is characterized in that: each multimedia broadcasting movable signal transmitter in the single frequency network fall that peak-to-average power ratio is empty modulates that time domain discrete data sample block modulates frequently by sky that the signal that the sub-piece of time domain discrete data sample undertakies by specific 12 kinds of generate patterns adds, subtracts, conjugate operation is handled frequently and synthetic again; Has periodic time domain repetition training series of discrete sample value piece in the signal frame of each multimedia broadcasting movable signal transmitter in the single frequency network; The length X of the training sequence of each multimedia broadcasting movable signal transmitter in the single frequency network is in 512,1024,2048, corresponding empty length K of modulating the FFT data block frequently is respectively 2048,4096,8192, the frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively empty 1/4,1/8,1/16 of the FFT data block length K size of frequently modulating; The training sequence of each multimedia broadcasting movable signal transmitter in the single frequency network, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of each multimedia broadcasting movable signal transmitter in the single frequency network have orthogonality each other; Each different operational indicator sequence of each multimedia broadcasting movable signal transmitter in the single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting movable signal transmitter in the single frequency network; 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 code check of space-frequency coding device is 1.
Characteristics of the present invention:
The present invention is the framing modulation scheme that mix in a kind of time-domain and frequency-domain spatial domain.The empty generate pattern of modulating time domain discrete data sample block frequently of peak-to-average power ratio of falling of the present invention is modulated the time domain discrete data sample block choosing method with the empty frequency of peak-to-average power ratio that falls with minimum peak-to-average power ratio, 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 each multimedia broadcasting movable signal transmitter in the single frequency network, the training sequence of each multimedia broadcasting movable signal transmitter in the single frequency network, the operational indicator sequence has pseudo-random characteristics, the training sequence of each multimedia broadcasting movable signal transmitter in the single frequency network, the operational indicator sequence has orthogonality each other, the signal frame of each multimedia broadcasting movable signal transmitter in the single frequency network is that frame head is inserted into that to fall the empty time domain cyclic prefix discrete data sample block of frequently modulating of peak-to-average power ratio be frame and forming by time domain repetition training series of discrete sample value piece, and these have guaranteed that multimedia broadcasting movable 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 fallen the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio to form signal frame body as the insertion of protection interval, can reduce the interference effect between signal frame head and the frame data.The code element modulation is rotated the diversity that mobile multimedia broadcast signal is provided with code element.Each different operational indicator sequence of each multimedia broadcasting movable signal transmitter in the single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting movable signal transmitter in the single frequency network, digital TV multimedia broadcast single frequency network 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 Data Rate can control multi-service digital TV multimedia broadcast single frequency network to move plurality of advantages such as transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to the single frequency network transmitter of multimedia broadcasting single frequency network movable signal framing modulator approach of the present invention.
Fig. 2 is the embodiment schematic diagram according to the single frequency network transmitter signal framing modulation of multimedia broadcasting single frequency network movable 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 the single frequency network transmitter of the multimedia broadcasting single frequency network movable signal framing modulator approach that proposes according to the present invention as shown in Figure 1, follows these steps to carry out:
1) the network data management device of single frequency network will be imported flow through code element modulation of data bit and be rotated in code element and form the FFT data block on the frequency domain, and FFT represents the fast discrete Fourier conversion, and the length of FFT 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) to adopt code check be that 1 space-frequency coding device will be modulated to each multimedia broadcasting movable signal transmitter branches in the single frequency network in the FFT data block that frequency domain forms and form and emptyly frequently modulate the FFT data block to the network data management device of single frequency network, and the time synchronized of adjusting each multimedia broadcasting movable signal transmitter branches is all modulated the FFT data block frequently to sky at one time and handled to guarantee all transmitters in the network;
3) each multimedia broadcasting movable signal transmitter in the single frequency network adopts IFFT that sky is modulated the FFT data block frequently and is transformed to the empty time domain discrete data sample block D that frequently modulates
Total, IFFT represents the fast discrete Fourier inverse transformation;
4) each multimedia broadcasting movable signal transmitter in the single frequency network is modulated sky frequently time domain discrete data sample block in order and is divided equally into two, the empty sub-piece D of time domain discrete data sample that frequently modulates
1Frequently modulate the sub-piece D of time domain discrete data sample with sky
2, D
Total=[D
1, D
2];
5) each multimedia broadcasting movable signal transmitter in the single frequency network is modulated the sub-piece D of time domain discrete data sample by the peak-to-average power ratio adjustment unit frequently to sky
1, the empty sub-piece D of time domain discrete data sample that frequently modulates
2Carry out that signal adds, subtracts, conjugate operation is handled and the synthetic new empty time domain discrete data sample block D that frequently modulates again
New, the new empty time domain discrete data sample block D that frequently modulates
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
Relatively 12 kinds of synthetic empty frequencies of generate pattern are modulated time domain discrete data sample block D
New, choose the empty frequency of peak-to-average power ratio that falls that wherein has minimum peak-to-average power ratio and modulate time domain discrete data sample block
And the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio will be fallen
The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D
* 1Expression is modulated the sub-piece D of time domain discrete data sample frequently to sky
1Each empty modulate that time domain discrete data sample carries out that conjugate operation is handled frequently and the empty sub-piece of time domain discrete data sample of frequently modulating that obtains;
6) each multimedia broadcasting movable signal transmitter in the single frequency network inserts Cyclic Prefix at interval as protection and falls the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio, the empty time domain cyclic prefix discrete data sample block of frequently modulating of peak-to-average power ratio falls in formation, as frame, the length of Cyclic Prefix is C, and falling the empty length of modulating time domain cyclic prefix discrete data sample block frequently of peak-to-average power ratio is C+K;
7) each multimedia broadcasting movable signal transmitter in the single frequency network 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 transmitter; X gets in 512,1024,2048; When X got 512, K got 2048, C and gets 1/4 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 4KHz; When X got 1024, K got 4096, C and gets 1/8 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 2KHz; When X got 2048, K got 8192, C and gets 1/16 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 1KHz;
8) discrete sample block of the sequence of plural training that will constitute in time domain of each multimedia broadcasting movable signal transmitter in the single frequency network repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
9) each multimedia broadcasting movable signal transmitter in the single frequency network is that frame head is inserted into and falls peak-to-average power ratio empty frequently to modulate time domain cyclic prefix discrete data sample block be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
10) each multimedia broadcasting movable signal transmitter in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) each multimedia broadcasting movable signal transmitter in the single frequency network with the baseband signal up-conversion to carrier wave.
Embodiment according to the single frequency network transmitter signal framing of multimedia broadcasting single frequency network movable signal framing modulator approach of the present invention is modulated, as shown in Figure 2, specifically implement as follows:
The network data management device of single frequency network will be imported flow through code element modulation of data bit and be rotated in code element and form the FFT data block on the frequency domain; 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; Adopting code check is that 1 space-frequency coding device will be modulated to each multimedia broadcasting movable signal transmitter branches in the single frequency network in the FFT data block that frequency domain forms and form and emptyly frequently modulate the FFT data block, and the time synchronized of adjusting each multimedia broadcasting movable signal transmitter branches is all modulated the FFT data block frequently to sky at one time and handled to guarantee all transmitters in the network; Through IFFT it is transformed to the empty time domain discrete data sample block of frequently modulating again, generates and choose the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio of falling that wherein has minimum peak-to-average power ratio by the peak-to-average power ratio adjustment unit and simultaneously the generate pattern information of the corresponding employing of institute is sent to the operational indicator sequence unit is set.
Each multimedia broadcasting movable signal transmitter in the single frequency network inserts Cyclic Prefix at interval as protection and falls the peak-to-average power ratio time domain discrete data sample block; the peak-to-average power ratio time domain cyclic prefix discrete data sample block falls in formation; as frame, the length of Cyclic Prefix is C.
Each multimedia broadcasting movable signal transmitter in the single frequency network 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 transmitter.
The discrete sample block of the sequence of plural training that each multimedia broadcasting movable signal transmitter in the single frequency network 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.
Each multimedia broadcasting movable signal transmitter in the single frequency network is that frame head is inserted into that to fall the peak-to-average power ratio time domain cyclic prefix discrete data sample block be frame with time domain repetition training series of discrete sample value piece, to form signal frame.
Each multimedia broadcasting movable signal transmitter in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped.
Each multimedia broadcasting movable signal transmitter in the single frequency network with the baseband signal up-conversion to carrier wave.
The X of each multimedia broadcasting movable signal transmitter in the single frequency network gets in 512,1024,2048; When X got 512, K got 2048, C and gets 1/4 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 4KHz; When X got 1024, K got 4096, C and gets 1/8 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 2KHz; When X got 2048, K got 8192, C and gets 1/16 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 1KHz; Training sequence, operational indicator sequence as each multimedia broadcasting movable signal transmitter in the single frequency network 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 each multimedia broadcasting movable signal transmitter in the single frequency network.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 (7)
1. a multimedia broadcasting single frequency network movable signal framing modulator approach is characterized in that it comprises the following steps:
1) the network data management device of single frequency network will be imported flow through code element modulation of data bit and be rotated in code element and form the FFT data block on the frequency domain, and the length of FFT 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) to adopt code check be that 1 space-frequency coding device will be modulated to each multimedia broadcasting movable signal transmitter branches in the single frequency network in the FFT data block that frequency domain forms and form and emptyly frequently modulate the FFT data block to the network data management device of single frequency network, and the time synchronized of adjusting each multimedia broadcasting movable signal transmitter branches is all modulated the FFT data block frequently to sky at one time and handled to guarantee all transmitters in the network;
3) each multimedia broadcasting movable signal transmitter in the single frequency network adopts IFFT that sky is modulated the FFT data block frequently and is transformed to the empty time domain discrete data sample block D that frequently modulates
Total
4) each multimedia broadcasting movable signal transmitter in the single frequency network is modulated sky frequently time domain discrete data sample block in order and is divided equally into two, the empty sub-piece D of time domain discrete data sample that frequently modulates
1Frequently modulate the sub-piece D of time domain discrete data sample with sky
2, D
Total=[D
1, D
2];
5) each multimedia broadcasting movable signal transmitter in the single frequency network is modulated the sub-piece D of time domain discrete data sample by the peak-to-average power ratio adjustment unit frequently to sky
1, the empty sub-piece D of time domain discrete data sample that frequently modulates
2Carry out that signal adds, subtracts, the operation independent of conjugation is handled or combinatorial operation is handled and the synthetic new empty time domain discrete data sample block D that frequently modulates again
New, the new empty time domain discrete data sample block D that frequently modulates
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
Relatively 12 kinds of synthetic empty frequencies of generate pattern are modulated time domain discrete data sample block D
New, choose the empty frequency of peak-to-average power ratio that falls that wherein has minimum peak-to-average power ratio and modulate time domain discrete data sample block
And the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio will be fallen
The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D
* 1Expression is modulated the sub-piece D of time domain discrete data sample frequently to sky
1Each empty modulate that time domain discrete data sample carries out that conjugate operation is handled frequently and the empty sub-piece of time domain discrete data sample of frequently modulating that obtains;
6) each multimedia broadcasting movable signal transmitter in the single frequency network inserts Cyclic Prefix at interval as protection and falls the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio, the empty time domain cyclic prefix discrete data sample block of frequently modulating of peak-to-average power ratio falls in formation, as frame, the length of Cyclic Prefix is C, and falling the empty length of modulating time domain cyclic prefix discrete data sample block frequently of peak-to-average power ratio is C+K;
7) each multimedia broadcasting movable signal transmitter in the single frequency network 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 transmitter;
8) discrete sample block of the sequence of plural training that will constitute in time domain of each multimedia broadcasting movable signal transmitter in the single frequency network repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
9) each multimedia broadcasting movable signal transmitter in the single frequency network is that frame head is inserted into and falls peak-to-average power ratio empty frequently to modulate time domain cyclic prefix discrete data sample block be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
10) each multimedia broadcasting movable signal transmitter in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) each multimedia broadcasting movable signal transmitter in the single frequency network with the baseband signal up-conversion to carrier wave.
2. by the multimedia broadcasting single frequency network movable 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 each multimedia broadcasting movable signal transmitter in the described single frequency network, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the multimedia broadcasting single frequency network movable signal framing modulator approach of claim 2, it is characterized in that: described training sequence, operational indicator sequence are formed by a series of 1 or-1.
4. by the multimedia broadcasting single frequency network movable signal framing modulator approach of claim 2, it is characterized in that: described training sequence, operational indicator sequence have pseudo-random characteristics.
5. by the multimedia broadcasting single frequency network movable signal framing modulator approach of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
6. by the multimedia broadcasting single frequency network movable signal framing modulator approach of claim 1, it is characterized in that: described empty frequency is modulated the FFT data block and is made up of subcarrier; When X got 512, K got 2048, and the frequency interval of subcarrier is got 4KHz; When X got 1024, K got 4096, and the frequency interval of subcarrier is got 2KHz; When X got 2048, K got 8192, and the frequency interval of subcarrier is got 1KHz.
7. by the multimedia broadcasting single frequency network movable 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.
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