CN102238131B - Anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network - Google Patents
Anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network Download PDFInfo
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Abstract
The invention discloses an anti-interference radio signal framing modulation method for a multimedia broadcast single-frequency network. The method is a time domain/frequency domain/space domain hybrid framing modulation scheme. The anti-interference radio signal framing modulation method for the multimedia broadcast single-frequency network has the advantages of low peak to average power ratio, short synchronization time, anti-interference performance, multi-service controllability and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network.
Background technology
The higher peak-to-average power ratio (PAPR) of OFDM (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, can cause signal distortion, signal spectrum is changed, cause the orthogonality between subchannel to be destroyed, produce the phase mutual interference, make system performance degradation, the solution that must consider how to reduce the probability of occurrence of large peak power signal in ofdm signal and reduce the nonlinear distortion impact.BICM technology (Bit Interleave coded modulation, Bit Interleaved Coded Modulation, BICM) adopt bit interleaver and make coding and modulated process relatively independent, diversity order is improved significantly, and makes communication system have good bit error performance under multidiameter fading channel.The networking model of employing single frequency network can improve the availability of frequency spectrum of digital TV multimedia broadcast wireless transmissions system greatly.In actual single frequency network communication environment, digital TV multimedia broadcast radio communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Multimedia broadcasting single frequency network anti-interference wireless signal transmitter framing modulator approach is to realize the key technology of reliable digit television multimedia broadcast single frequency network wireless transmission.
Utilizing digital TV multimedia broadcast single frequency network wireless transmitting system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital television multimedia broadcast wireless transmissions system satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network, can satisfy the needs that High Data Rate can be controlled multi-service digital TV multimedia broadcast single frequency network wireless transmission.
Wish is done more deep understanding to the patent background can be with reference to following documents and materials:
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimedia?communications”.Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digital?television?development，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.8-21，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stationary?portable?and?mobile?use，”Proceedings?ofthe?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?coded?modulation，”IEEE?Trans.Information?Theory，vol.44，no.3，pp.927-946，May?1998.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service digital TV multimedia broadcast single frequency network wireless transmission problem, proposed a kind of anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network.
A kind of anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network 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 inputted the data bit multi code Rate of Chinese character of flowing through and delete remaining convolutional encoding, Bit Interleave, code element and be modulated at and form FFT Bit Interleave coding modulation data piece on frequency domain, FFT represents the fast discrete Fourier conversion, and the length of FFT Bit Interleave coding modulation data piece is K;
2) to adopt code check be that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each multimedia broadcasting anti-interference wireless signal transmitter branch road in single frequency network and emptyly frequently modulates FFT Bit Interleave coding modulation data piece to the network data management device of single frequency network, and the time synchronized of adjusting each multimedia broadcasting anti-interference wireless signal transmitter branch road is all frequently modulated FFT Bit Interleave coding modulation data piece to sky at one time and processed to guarantee all transmitters in network;
3) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network adopts IFFT that sky is modulated FFT Bit Interleave coding modulation data piece frequently and is transformed to the empty time domain discrete Bit Interleave coding modulation data sample value piece D that frequently modulates
Total, IFFT represents the fast discrete Fourier inverse transformation;
4) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is frequently modulated sky in order time domain discrete Bit Interleave coding modulation data sample value piece and is divided equally into two, the empty time domain discrete Bit Interleave coding modulation data sample value sub-block D that frequently modulates
1Frequently modulate time domain discrete Bit Interleave coding modulation data sample value sub-block D with sky
2, D
Total=[D
1, D
2];
5) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is modulated time domain discrete Bit Interleave coding modulation data sample value sub-block D by the peak-to-average power ratio adjustment unit frequently to sky
1, the empty time domain discrete Bit Interleave coding modulation data sample value sub-block D that frequently modulates
2Carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new empty time domain discrete Bit Interleave coding modulation data sample value piece D that frequently modulates again
new, the new empty time domain discrete Bit Interleave coding modulation data sample value piece 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 Bit Interleave coding modulation data sample value piece 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 Bit Interleave coding modulation data sample value piece
And the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating of peak-to-average power ratio will fall
The corresponding generate pattern information that adopts send to operational indicator sequence setting unit, wherein, D
* 1Expression is modulated time domain discrete Bit Interleave coding modulation data sample value sub-block D frequently to sky
1Each empty modulate that time domain discrete Bit Interleave coding modulation data sample value carries out that conjugate operation is processed frequently and the empty time domain discrete Bit Interleave coding modulation data sample value sub-block of frequently modulating that obtains;
6) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network falls the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating of peak-to-average power ratio with Cyclic Prefix as protection interval insertion, the empty time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece 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 bits interweaving encoding modulating data sample value piece frequently of peak-to-average power ratio is C+K;
7) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network with training sequence as the real part sequence of sequence of plural training, operational indicator sequence that operational indicator sequence setting unit is the set imaginary part sequence as sequence of plural training, consist of the discrete sample block of sequence of plural training on time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting anti-interference wireless signal transmitter;
8) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network will repeat continuously 2 times and form time domain repetition training series of discrete sample value piece on time domain in the discrete sample block of the sequence of plural training that consists of on time domain, as frame head;
9) each multimedia broadcasting anti-interference wireless signal transmitter in 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 bits interweaving encoding modulating data sample value piece be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
10) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) in single frequency network each multimedia broadcasting anti-interference wireless signal transmitter with the baseband signal up-conversion to carrier wave.
Anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network according to above-mentioned is characterized in that: each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network fall that peak-to-average power ratio is empty modulates that time domain discrete Bit Interleave coding modulation data sample value piece modulates frequently by sky that the signal that time domain discrete Bit Interleave coding modulation data sample value sub-block undertaken by specific 12 kinds of generate patterns adds, subtracts, conjugate operation is processed frequently and again synthetic; Has periodic time domain repetition training series of discrete sample value piece in the signal frame of each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network; The length X of the training sequence of each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is in 512,1024,2048, corresponding empty length K of modulating FFT Bit Interleave coding modulation data piece 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 Bit Interleave coding modulation data block length K size of frequently modulating; The training sequence of each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network have orthogonality each other; Each different operational indicator sequence of each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network; The code check of space-frequency coding device is 1; The input data are carried out multi code Rate of Chinese character, and to delete the encoding rate of remaining convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8 one; Bit Interleave adopts the random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
Characteristics of the present invention:
The present invention is the framing modulation scheme of a kind of time-domain and frequency-domain spatial domain mixing.the empty generate pattern of modulating time domain discrete Bit Interleave coding modulation data sample value piece frequently of peak-to-average power ratio of falling of the present invention is modulated time domain discrete Bit Interleave coding modulation data sample value piece 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 large peak power signal probability of the maximum peak power that not only can take full advantage of ofdm signal is very low, the real part of the ofdm signal when number of sub carrier wave is larger (or imaginary part) is the characteristic of multiple Gaussian random process and whose amplitude obeys Rayleigh distribution, the amount of information of the required extra transmission of generate pattern of adopting is little, be easy to process at receiver end the primary signal of recovering to obtain ofdm signal, 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 anti-interference wireless signal transmitter in single frequency network, the training sequence of each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network, the operational indicator sequence has pseudo-random characteristics, the training sequence of each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network, the operational indicator sequence has orthogonality each other, the signal frame of each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the empty time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece of frequently modulating of peak-to-average power ratio be frame and forming by time domain repetition training series of discrete sample value piece, these have guaranteed that multimedia broadcasting anti-interference wireless 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 are reliably followed the tracks of.Cyclic Prefix is fallen the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating of peak-to-average power ratio to form signal frame body as protection interval insertion, can reduce the interference effect between signal frame head and frame Bit Interleave coding modulation data.Adopt BICM to carry out the Bit Interleave coded modulation to the input data and improved diversity order, make communication system have good bit error performance under multidiameter fading channel.Each different operational indicator sequence of each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network, can so that digital TV multimedia broadcast single frequency network wireless transmitting system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Framing modulator approach of the present invention has the equal power ratio of ebb, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide High Data Rate can control the plurality of advantages such as multi-service digital TV multimedia broadcast single frequency network wireless transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to the single frequency network transmitter of anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network of the present invention.
Fig. 2 is the embodiment schematic diagram according to the single frequency network transmitter signal framing modulation of anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network 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 anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network 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 inputted the data bit multi code Rate of Chinese character of flowing through and delete remaining convolutional encoding, Bit Interleave, code element and be modulated at and form FFT Bit Interleave coding modulation data piece on frequency domain, FFT represents the fast discrete Fourier conversion, and the length of FFT Bit Interleave coding modulation data piece is K; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts the random interleaving mode, code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping;
2) to adopt code check be that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each multimedia broadcasting anti-interference wireless signal transmitter branch road in single frequency network and emptyly frequently modulates FFT Bit Interleave coding modulation data piece to the network data management device of single frequency network, and the time synchronized of adjusting each multimedia broadcasting anti-interference wireless signal transmitter branch road is all frequently modulated FFT Bit Interleave coding modulation data piece to sky at one time and processed to guarantee all transmitters in network;
3) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network adopts IFFT that sky is modulated FFT Bit Interleave coding modulation data piece frequently and is transformed to the empty time domain discrete Bit Interleave coding modulation data sample value piece D that frequently modulates
Total, IFFT represents the fast discrete Fourier inverse transformation;
4) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is frequently modulated sky in order time domain discrete Bit Interleave coding modulation data sample value piece and is divided equally into two, the empty time domain discrete Bit Interleave coding modulation data sample value sub-block D that frequently modulates
1Frequently modulate time domain discrete Bit Interleave coding modulation data sample value sub-block D with sky
2, D
Total=[D
1, D
2];
5) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is modulated time domain discrete Bit Interleave coding modulation data sample value sub-block D by the peak-to-average power ratio adjustment unit frequently to sky
1, the empty time domain discrete Bit Interleave coding modulation data sample value sub-block D that frequently modulates
2Carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new empty time domain discrete Bit Interleave coding modulation data sample value piece D that frequently modulates again
new, the new empty time domain discrete Bit Interleave coding modulation data sample value piece 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 Bit Interleave coding modulation data sample value piece 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 Bit Interleave coding modulation data sample value piece
And the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating of peak-to-average power ratio will fall
The corresponding generate pattern information that adopts send to operational indicator sequence setting unit, wherein, D
* 1Expression is modulated time domain discrete Bit Interleave coding modulation data sample value sub-block D frequently to sky
1Each empty modulate that time domain discrete Bit Interleave coding modulation data sample value carries out that conjugate operation is processed frequently and the empty time domain discrete Bit Interleave coding modulation data sample value sub-block of frequently modulating that obtains;
6) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network falls the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating of peak-to-average power ratio with Cyclic Prefix as protection interval insertion, the empty time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece 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 bits interweaving encoding modulating data sample value piece frequently of peak-to-average power ratio is C+K;
7) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network with training sequence as the real part sequence of sequence of plural training, operational indicator sequence that operational indicator sequence setting unit is the set imaginary part sequence as sequence of plural training, consist of the discrete sample block of sequence of plural training on time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting anti-interference wireless 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 FFT Bit Interleave coding modulation data piece subcarrier 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 FFT Bit Interleave coding modulation data piece subcarrier 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 FFT Bit Interleave coding modulation data piece subcarrier is frequently got 1KHz;
8) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network will repeat continuously 2 times and form time domain repetition training series of discrete sample value piece on time domain in the discrete sample block of the sequence of plural training that consists of on time domain, as frame head;
9) each multimedia broadcasting anti-interference wireless signal transmitter in 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 bits interweaving encoding modulating data sample value piece be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
10) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) in single frequency network each multimedia broadcasting anti-interference wireless signal transmitter with the baseband signal up-conversion to carrier wave.
Embodiment according to the single frequency network transmitter signal framing of anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network of the present invention is modulated as shown in Figure 2, specifically is implemented as follows:
The network data management device of single frequency network will be inputted the data bit multi code Rate of Chinese character of flowing through and delete remaining convolutional encoding, Bit Interleave, code element and be modulated at and form FFT Bit Interleave coding modulation data piece on frequency domain; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts the random interleaving mode, code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; Adopting code check is that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each multimedia broadcasting anti-interference wireless signal transmitter branch road in single frequency network and emptyly frequently modulates FFT Bit Interleave coding modulation data piece, and the time synchronized of adjusting each multimedia broadcasting anti-interference wireless signal transmitter branch road is all frequently modulated FFT Bit Interleave coding modulation data piece to sky at one time and processed to guarantee all transmitters in network; Through IFFT, it is transformed to the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating again, generates and choose by the peak-to-average power ratio adjustment unit the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating of peak-to-average power ratio that falls that wherein has minimum peak-to-average power ratio and simultaneously the generate pattern information of institute's correspondence employing is sent to operational indicator sequence setting unit.
Each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network falls peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece with Cyclic Prefix as protection interval insertion; peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece falls in formation; as frame, the length of Cyclic Prefix is C.Each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network with training sequence as the real part sequence of sequence of plural training, operational indicator sequence that operational indicator sequence setting unit is the set imaginary part sequence as sequence of plural training, consist of the discrete sample block of sequence of plural training on time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting anti-interference wireless signal transmitter.Each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network will repeat continuously 2 times and form time domain repetition training series of discrete sample value piece on time domain in the discrete sample block of the sequence of plural training that consists of on time domain, as frame head.Each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece be frame with time domain repetition training series of discrete sample value piece, to form signal frame.Each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped.Each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network with the baseband signal up-conversion to carrier wave.
The X of each multimedia broadcasting anti-interference wireless signal transmitter in 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 FFT Bit Interleave coding modulation data piece subcarrier 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 FFT Bit Interleave coding modulation data piece subcarrier 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 FFT Bit Interleave coding modulation data piece subcarrier is frequently got 1KHz; Training sequence, operational indicator sequence as each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network form by a series of 1 or-1, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other; The training sequence that satisfies above-mentioned feature can be by as one group of Phase shift m sequence of a kind of specific type of pseudo-random number sequence with as walsh sequence, the Hadamard sequences of orthogonal sequence or realized 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 anti-interference wireless signal transmitter in 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.
The above has been described in detail specific embodiments of the invention by reference to the accompanying drawings, but the present invention is not limited to above-described embodiment, and in the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.
Claims (7)
1. an anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network, is characterized in that it comprises the following steps:
1) the network data management device of single frequency network will be inputted the data bit multi code Rate of Chinese character of flowing through and delete remaining convolutional encoding, Bit Interleave, code element and be modulated at and form FFT Bit Interleave coding modulation data piece on frequency domain, and the length of FFT Bit Interleave coding modulation data piece is K;
2) to adopt code check be that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each multimedia broadcasting anti-interference wireless signal transmitter branch road in single frequency network and emptyly frequently modulates FFT Bit Interleave coding modulation data piece to the network data management device of single frequency network, and the time synchronized of adjusting each multimedia broadcasting anti-interference wireless signal transmitter branch road is all frequently modulated FFT Bit Interleave coding modulation data piece to sky at one time and processed to guarantee all transmitters in network;
3) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network adopts IFFT that sky is modulated FFT Bit Interleave coding modulation data piece frequently and is transformed to the empty time domain discrete Bit Interleave coding modulation data sample value piece D that frequently modulates
Total
4) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is frequently modulated sky in order time domain discrete Bit Interleave coding modulation data sample value piece and is divided equally into two, the empty time domain discrete Bit Interleave coding modulation data sample value sub-block D that frequently modulates
1Frequently modulate time domain discrete Bit Interleave coding modulation data sample value sub-block D with sky
2, D
Total=[D
1, D
2];
5) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network is modulated time domain discrete Bit Interleave coding modulation data sample value sub-block D by the peak-to-average power ratio adjustment unit frequently to sky
1, the empty time domain discrete Bit Interleave coding modulation data sample value sub-block D that frequently modulates
2Carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new empty time domain discrete Bit Interleave coding modulation data sample value piece D that frequently modulates again
new, the new empty time domain discrete Bit Interleave coding modulation data sample value piece 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 Bit Interleave coding modulation data sample value piece 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 Bit Interleave coding modulation data sample value piece
And the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating of peak-to-average power ratio will fall
The corresponding generate pattern information that adopts send to operational indicator sequence setting unit, wherein, D
* 1Expression is modulated time domain discrete Bit Interleave coding modulation data sample value sub-block D frequently to sky
1Each empty modulate that time domain discrete Bit Interleave coding modulation data sample value carries out that conjugate operation is processed frequently and the empty time domain discrete Bit Interleave coding modulation data sample value sub-block of frequently modulating that obtains;
6) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network falls the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating of peak-to-average power ratio with Cyclic Prefix as protection interval insertion, the empty time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece 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 bits interweaving encoding modulating data sample value piece frequently of peak-to-average power ratio is C+K;
7) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network with training sequence as the real part sequence of sequence of plural training, operational indicator sequence that operational indicator sequence setting unit is the set imaginary part sequence as sequence of plural training, consist of the discrete sample block of sequence of plural training on time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting anti-interference wireless signal transmitter;
8) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network will repeat continuously 2 times and form time domain repetition training series of discrete sample value piece on time domain in the discrete sample block of the sequence of plural training that consists of on time domain, as frame head;
9) each multimedia broadcasting anti-interference wireless signal transmitter in 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 bits interweaving encoding modulating data sample value piece be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
10) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) each multimedia broadcasting anti-interference wireless signal transmitter in single frequency network with the baseband signal up-conversion to carrier wave.
2. by the anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of each multimedia broadcasting anti-interference wireless signal transmitter in described single frequency network, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network of claim 2, it is characterized in that: described training sequence, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics.
4. by the anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. press the anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network of claim 1, it is characterized in that: describedly the input data are carried out multi code Rate of Chinese character delete the multi code Rate of Chinese character of remaining convolutional encoding, Bit Interleave, code element modulation treatment to delete the encoding rate of remaining convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8 one, Bit Interleave adopts the random interleaving mode, code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
6. by the anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network of claim 1, it is characterized in that: described empty frequency is modulated FFT Bit Interleave coding modulation data piece and is comprised 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 anti-interference radio signal framing modulation method for multimedia broadcast single-frequency network 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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