CN101778083A - Multimedia broadcast wireless signal single-frequency network anti-noise transmission method - Google Patents
Multimedia broadcast wireless signal single-frequency network anti-noise transmission method Download PDFInfo
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Abstract
The invention discloses a multimedia broadcast wireless signal single-frequency network anti-noise transmission method. In the multimedia broadcast wireless signal single-frequency network anti-noise transmission method of the invention, after processing of multimedia data stream by a central data manager on a single-frequency network multimedia broadcast wireless transmitter, network data manager bit stream LDPC coding, code element modulation, constellation rotation, empty frequency code modulation, frame body formation, time domain training sequence insertion framing, pulse shaping, and up-conversion to carrier waves, multimedia broadcast wireless signals form radio-frequency signals which are transmitted to an air wireless channel and received by a receiver terminal for processing signals transmitted by each multimedia broadcast wireless transmitter in a single-frequency network. The multimedia broadcast wireless signal single-frequency network anti-noise transmission method has the advantages of short receiving synchronization time, high transmission efficiency, controllable multiple services and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method.
Background technology
At present, wireless videocast develops to the digitlization direction gradually from simulation.The digital television broadcasting wireless transmitting system, as the wireless important component part of digital television broadcasting, its development of technologies, closely bound up with people's quality of life, and therefore be subjected to people's extensive concern especially.Digital television broadcasting wireless-related technologies and related industry thereof are that development is very fast in the Communications And Computer field, the industry of good market prospect.On the digital television broadcasting wireless-related technologies, the emphasis of various countries' concern at present is that how being complex wave, the wireless implementation of reliable high-speed mobile cheaply that provides of digital television broadcasting under the environment is provided.The digital television broadcasting Radio Transmission Technology is the key technology of digital television broadcasting wireless system, for whole system performance decisive role, is the object of everybody primary study.
Because the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes becoming more and more easier.Because of OFDM multi-carrier transmission technology has simple in structure, the availability of frequency spectrum high plurality of advantages such as becomes and extremely everybody concern and obtain deep research and the extensive use in numerous areas such as Xdsl, wide-band mobile communication, wideband wireless local area network, digital television broadcasting in the time of can resisting frequency selectivity and channel.
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.
Since Shannon had proposed famous channel coding theorem, scholars were devoted to construct error correcting capability near theoretical limit and the acceptable channel coding method of encoder complexity always.In 1993, people such as Berrou proposed Turbo code, and its superior performance has shocked coding circle, became the research focus on coding circle soon.Just along with the research that deepens continuously of Turbo code, people just find low density parity check code (the Low Density Parity Check of Turbo code and Gallager proposition in 1962, LDPC) many similarities are arranged, both adopt the mode of random coded at coding side, all adopt the iterative decoding mode at the decoding end.Why Gallager did not find this characteristic of LDPC sign indicating number at that time, main cause is that the simulation capacity when computer-chronograph is limited, can't carry out The Realization of Simulation to the long LDPC sign indicating number of code word, be difficult in real system, be employed and so once out in the cold because the restriction of level of hardware at that time makes academia think that LDPC sign indicating number decoding algorithm is too complicated.Up to 1996, the LDPC sign indicating number had the performance of approaching the Shannon limit when MacKay and Neal proof adopted the BP iterative decoding algorithm, from then on made the research and the application of LDPC coding stride into a new stage.The LDPC sign indicating number is a kind ofly to be used in noise transmission channel transmission information and to carry out the error correcting code of forward error correction (FEC, ForwardError Correction).The LDPC code word can be regarded a kind of sign indicating number with binary parity check matrix as, and the element of parity matrix nearly all is zero.Although LDPC coding and other error correction codings can not guarantee errorless transmission, the probability of loss of information can drop to required degree.LDPC coding be a kind of message transmission rate that can make near theoretical maximum, i.e. the encoding scheme of shannon limit.It is firm found the time to encode at LDPC, in most of the cases can't practical application because the amount of calculation of algorithm and encoder is excessive, thereby be not used widely.Yet, after LDPC sign indicating number in 1996 is re-recognized, in communication system, be used widely, such as: all considered to adopt of the application of LDPC sign indicating number in IEEE 802.16e standard, the IEEE 802.11n standard etc. as chnnel coding.
In the practical communication environment, the digital television broadcasting performance in wireless communication systems is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.The digital television broadcasting wireless signal transmission method is the key technology that realizes reliable digit television broadcasting radio communication.
Utilizing the digital television broadcasting wireless transmitting system that may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service are provided is embodiments that digital television broadcasting wireless transmitting 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 broadcast wireless signal single-frequency network anti-noise transmission method, can satisfy the needs of High Data Rate may command multi-service digital television broadcasting wireless transmission.
Desire is done more deep understanding to the patent background can be with reference to following documents and materials:
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Summary of the invention
The present invention is directed to High Data Rate may command multi-service digital television broadcasting wireless transmission problem, proposed a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method.
A kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method that the present invention proposes is characterized in that multimedia broadcast wireless signal each multimedia broadcasting transmitting set in single frequency network is sent to the on-air radio channel and handles the signal that each multimedia broadcasting transmitting set in the single frequency network is sent by the receiver end reception through following steps:
1) the centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to data bit flow;
2) the network data management device of single frequency network will be imported data bit and flow through and further form FFT coded data block (length of FFT coded data block (symbol numbers) is K) after LDPC coding, code element modulation, the constellation rotation on frequency domain;
3) to adopt code check be that FFT coded data block that 1 space-frequency coding device will form on frequency domain is modulated to form on each multimedia broadcasting transmitting set branch road in the single frequency network and emptyly frequently modulates FFT coded data block (empty length (symbol numbers) of modulating the FFT coded data block frequently is K) to the network data management device of single frequency network, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the FFT coded data block frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each multimedia broadcasting transmitting set in the single frequency network adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the FFT coded data block frequently and is transformed to the empty time domain discrete coded data sample value piece of frequently modulating;
5) each multimedia broadcasting transmitting set in the single frequency network is inserted into the empty time domain discrete coded data sample value piece of frequently modulating with Cyclic Prefix (length of Cyclic Prefix is C) at interval as protection, forms the empty discrete coded data sample value piece of time domain cyclic prefix (empty length of modulating the discrete coded data sample value piece of time domain cyclic prefix frequently is (K+C)) of frequently modulating;
6) each multimedia broadcasting transmitting set in the single frequency network forms frame (length of frame is L, L=4 * (K+C)) with continuous 4 empty discrete coded data sample value pieces of time domain cyclic prefix of frequently modulating;
7) each multimedia broadcasting transmitting set in the single frequency network as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitutes the discrete sample block (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X) of sequence of plural training with training sequence on time domain;
8) each multimedia broadcasting transmitting set in the single frequency network is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain, to form signal frame;
9) each multimedia broadcasting transmitting set in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) each multimedia broadcasting transmitting set in the single frequency network forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
11) receiver end receives and handles the signal that each multimedia broadcasting transmitting set in the single frequency network is sent.
Multimedia broadcast wireless signal single-frequency network anti-noise transmission method according to above-mentioned is characterized in that: the centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to data bit flow; The network data management device of single frequency network will be imported data bit and flow through and further form FFT coded data block (length of FFT coded data block (symbol numbers) is K) after LDPC coding, code element modulation, the constellation rotation on frequency domain; It is that FFT coded data block that 1 space-frequency coding device will form on frequency domain is modulated to form on each multimedia broadcasting transmitting set branch road in the single frequency network and emptyly frequently modulates FFT coded data block (empty length (symbol numbers) of modulating the FFT coded data block frequently is K) that the network data management device of single frequency network adopts code check, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the FFT coded data block frequently to sky at one time and handled to guarantee all transmitters in the network; Each multimedia broadcasting transmitting set in the single frequency network adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the FFT coded data block frequently and is transformed to the empty time domain discrete coded data sample value piece of frequently modulating; Has periodic time-domain training sequence discrete sample block in the signal frame of each multimedia broadcasting transmitting set in the single frequency network; Length (symbol numbers) X of the training sequence of each multimedia broadcasting transmitting set in the single frequency network is 512; Empty length (symbol numbers) K (sub-carrier number) that modulates the FFT coded data block frequently of each multimedia broadcasting transmitting set in the single frequency network gets in 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 coded data block length K size of frequently modulating; The training sequence of each multimedia broadcasting transmitting set 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 transmitting set in the single frequency network have orthogonality each other; Each different operational indicator sequence of each multimedia broadcasting transmitting set in the single frequency network is comprising and unique each system parameters and business model information of expressing the multimedia broadcasting transmitting set.The encoding rate that each multimedia broadcasting transmitting set in the single frequency network carries out LDPC coding to the input data bit flow is in 1/4,1/2,5/8,3/4 and 7/8; The code element of each multimedia broadcasting transmitting set in the single frequency network is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The constellation rotation angle of QPSK symbol constellations is 22.5 degree, and the constellation rotation angle of 16QAM symbol constellations is 11.25 degree, and the constellation rotation angle of 64QAM symbol constellations is 5.626 degree, and the constellation rotation angle of 256QAM symbol constellations is 2.8125 degree.
Characteristics of the present invention:
The present invention is the signal diversifying antinoise transmission plan that a kind of spatial domain time-domain and frequency-domain mixes.Has periodic time-domain training sequence discrete sample block in the signal frame of each multimedia broadcasting transmitting set in the single frequency network, the training sequence of each multimedia broadcasting transmitting set in the single frequency network, the operational indicator sequence has pseudo-random characteristics, the training sequence of each multimedia broadcasting transmitting set in the single frequency network, the operational indicator sequence has orthogonality each other, each multimedia broadcasting transmitting set in the single frequency network is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain and forms signal frame, and these have guaranteed that multimedia broadcasting wireless receiver end 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.Each multimedia broadcasting transmitting set in the single frequency network adopts the LDPC coding that the input data bit flow is carried out chnnel coding error-correcting performance near shannon limit is provided.Each multimedia broadcasting transmitting set in the single frequency network is inserted into the empty time domain discrete coded data sample value piece of frequently modulating with Cyclic Prefix at interval as protection and forms the empty discrete coded data sample value piece of time domain cyclic prefix of frequently modulating, and can reduce the interference effect between the adjacent signals data sample piece.Each multimedia broadcasting transmitting set in the single frequency network forms the efficient that frame can be carried multi-media broadcasting system with 4 continuous empty discrete coded data sample value pieces of time domain cyclic prefix of frequently modulating.The code element modulation of each multimedia broadcasting transmitting set in the single frequency network provides the signal diversifying effect with constellation rotation.Each different operational indicator sequence of each multimedia broadcasting transmitting set in the single frequency network is comprising and unique each system parameters and business model information of expressing the multimedia broadcasting transmitting set, the multimedia broadcasting wireless transmitting system can satisfy social needs so that can provide may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service.Multimedia broadcast wireless signal single-frequency network anti-noise transmission method of the present invention have receive lock in time short, clock jitter is little, the influence of anti-multimedia broadcasting radio communication background noise, can provide plurality of advantages such as High Data Rate may command multi-service digital television broadcasting wireless transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to signal transmission between the transmitter and receiver of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of the present invention.
Fig. 2 is the embodiment schematic diagram that forms according to signal frame in the signals transmission between the transmitter and receiver of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of the present invention.
Fig. 3 is the embodiment schematic diagram according to the constellation rotation method that the QPSK code element is modulated, the 16QAM code element is modulated of each multimedia broadcasting transmitting set in the single frequency network of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
The embodiment of signal transmission between the transmitter and receiver of the multimedia broadcast wireless signal single-frequency network anti-noise transmission method that proposes according to the present invention, as shown in Figure 1, multimedia broadcast wireless signal each multimedia broadcasting transmitting set in single frequency network is sent to the on-air radio channel and handles the signal that each multimedia broadcasting transmitting set in the single frequency network is sent by the receiver end reception through following steps:
1) the centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to data bit flow;
2) the network data management device of single frequency network will be imported data bit and flow through that (encoding rate of LDPC coding is 1/4 for LDPC coding, 1/2,5/8, in 3/4 and 7/8 one), (code element is modulated to QPSK in the code element modulation, 16QAM, 64QAM, a kind of with among the 256QAM, symbol constellations figure mapping mode adopts the Gray code mapping), (the constellation rotation angle of QPSK symbol constellations is 22.5 degree to constellation rotation, the constellation rotation angle of 16QAM symbol constellations is 11.25 degree, the constellation rotation angle of 64QAM symbol constellations is 5.626 degree, and the constellation rotation angle of 256QAM symbol constellations is 2.8125 degree) after further on frequency domain, form the FFT coded data block (length of FFT coded data block (symbol numbers) be K; The length of FFT coded data block (symbol numbers) K (sub-carrier number) gets in 2048,4096,8192; Get 2048 when the length K (sub-carrier number) of FFT coded data block, the frequency interval of corresponding subcarrier is got 4KHz; Get 4096 when the length K (sub-carrier number) of FFT coded data block, the frequency interval of corresponding subcarrier is got 2KHz; Get 8192 when the length K (sub-carrier number) of FFT coded data block, the frequency interval of corresponding subcarrier is got 1KHz);
3) to adopt code check be that FFT coded data block that 1 space-frequency coding device will form on frequency domain is modulated to form on each multimedia broadcasting transmitting set branch road in the single frequency network and emptyly frequently modulates FFT coded data block (empty length (symbol numbers) of modulating the FFT coded data block frequently is K) to the network data management device of single frequency network, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the FFT coded data block frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each multimedia broadcasting transmitting set in the single frequency network adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the FFT coded data block frequently and is transformed to the empty time domain discrete coded data sample value piece of frequently modulating;
5) (length of Cyclic Prefix is C to each multimedia broadcasting transmitting set in the single frequency network with Cyclic Prefix; Frequently modulate the length K (sub-carrier number) of FFT coded data block when sky and get 2048, corresponding circulating prefix-length C is empty 1/4 of the FFT coded data block length K size of frequently modulating; Frequently modulate the length K (sub-carrier number) of FFT coded data block when sky and get 4096, corresponding circulating prefix-length C is empty 1/8 of the FFT coded data block length K size of frequently modulating; Frequently modulate the length K (sub-carrier number) of FFT coded data block when sky and get 8192, corresponding circulating prefix-length C for empty frequently modulate FFT coded data block length K size 1/16) be inserted into the empty time domain discrete coded data sample value piece of frequently modulating at interval as protection, form the empty discrete coded data sample value piece of time domain cyclic prefix (empty length of modulating the discrete coded data sample value piece of time domain cyclic prefix frequently is (K+C)) of frequently modulating;
6) each multimedia broadcasting transmitting set in the single frequency network forms frame (length of frame is L, L=4 * (K+C)) with continuous 4 empty discrete coded data sample value pieces of time domain cyclic prefix of frequently modulating;
7) as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X to the discrete sample block of formation sequence of plural training to each multimedia broadcasting transmitting set in the single frequency network on time domain with training sequence; The length of training sequence (symbol numbers) X gets 512);
8) each multimedia broadcasting transmitting set in the single frequency network is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain, to form signal frame;
9) each multimedia broadcasting transmitting set in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) each multimedia broadcasting transmitting set in the single frequency network forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
11) receiver end receives and handles the signal that each multimedia broadcasting transmitting set in the single frequency network is sent.
Embodiment according to signal frame in the signals transmission between the transmitter and receiver of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of the present invention forms, as shown in Figure 2, specifically implement as follows:
The centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to data bit flow.
The network data management device of single frequency network will be imported data bit and flow through and further form FFT coded data block (length of FFT coded data block (symbol numbers) is K) after LDPC coding, code element modulation, the constellation rotation on frequency domain.
The FFT coded data block is made up of subcarrier.The length of FFT coded data block (symbol numbers) is K; K (sub-carrier number) gets in 2048,4096,8192; Get 2048 when the length K (sub-carrier number) of FFT coded data block, the frequency interval of corresponding subcarrier is got 4KHz; Get 4096 when the length K (sub-carrier number) of FFT coded data block, the frequency interval of corresponding subcarrier is got 2KHz; Get 8192 when the length K (sub-carrier number) of FFT coded data block, the frequency interval of corresponding subcarrier is got 1KHz.
It is that FFT coded data block that 1 space-frequency coding device will form on frequency domain is modulated to form on each multimedia broadcasting transmitting set branch road in the single frequency network and emptyly frequently modulates FFT coded data block (empty length (symbol numbers) of modulating the FFT coded data block frequently is K) that the network data management device of single frequency network adopts code check, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the FFT coded data block frequently to sky at one time and handled to guarantee all transmitters in the network.
Each multimedia broadcasting transmitting set in the single frequency network adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the FFT coded data block frequently and is transformed to the empty time domain discrete coded data sample value piece of frequently modulating.
Each multimedia broadcasting transmitting set in the single frequency network is inserted into the empty time domain discrete coded data sample value piece of frequently modulating with Cyclic Prefix (length of Cyclic Prefix is C) at interval as protection, forms the empty discrete coded data sample value piece of time domain cyclic prefix (empty length of modulating the discrete coded data sample value piece of time domain cyclic prefix frequently is (K+C)) of frequently modulating.
Length as protection Cyclic Prefix at interval is C; Frequently modulate the length K (sub-carrier number) of FFT coded data block when sky and get 2048, corresponding circulating prefix-length C is empty 1/4 of the FFT coded data block length K size of frequently modulating; Frequently modulate the length K (sub-carrier number) of FFT coded data block when sky and get 4096, corresponding circulating prefix-length C is empty 1/8 of the FFT coded data block length K size of frequently modulating; Frequently modulate the length K (sub-carrier number) of FFT coded data block when sky and get 8192, corresponding circulating prefix-length C is empty 1/16 of the FFT coded data block length K size of frequently modulating.
Each multimedia broadcasting transmitting set in the single frequency network forms frame with 4 continuous empty discrete coded data sample value pieces of time domain cyclic prefix of frequently modulating.
Each multimedia broadcasting transmitting set in the single frequency network as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitutes the discrete sample block of sequence of plural training with training sequence on time domain.
The length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is X all, and X gets 512.
Training sequence, operational indicator sequence as each multimedia broadcasting transmitting set 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 handing over sequence to realize 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 F 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 transmitting set in the single frequency network.
Each multimedia broadcasting transmitting set in the single frequency network is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain, to form signal frame.
Each multimedia broadcasting transmitting set in the single frequency network adopts square root raised cosine filter that the signal of signal frame is carried out pulse shaping.When K got 2048, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.1; When K got 4096, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.05; When K got 8192, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.025.
Each multimedia broadcasting transmitting set in the single frequency network forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave.
Receiver end receives handles the signal that each multimedia broadcasting transmitting set in the single frequency network is sent.
The embodiment of the QPSK code element modulation of each multimedia broadcasting transmitting set in the single frequency network of the multimedia broadcast wireless signal single-frequency network anti-noise transmission method that proposes according to the present invention, the constellation rotation method of 16QAM code element modulation, the symbol constellations figure mapping mode of the QPSK code element of each multimedia broadcasting transmitting set in single frequency network modulation as shown in Figure 3,, the modulation of 16QAM code element adopts the Gray code mapping; The constellation rotation angle of QPSK symbol constellations is 22.5 degree, and the constellation rotation angle of 16QAM symbol constellations is 11.25 degree.
In conjunction with the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to the foregoing description, under the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.
Claims (21)
1. multimedia broadcast wireless signal single-frequency network anti-noise transmission method is characterized in that multimedia broadcast wireless signal each multimedia broadcasting transmitting set in single frequency network is sent to the on-air radio channel and is received by receiver end through following steps to handle the signal that each multimedia broadcasting transmitting set in the single frequency network is sent:
1) the centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to data bit flow;
2) the network data management device of single frequency network will be imported data bit and flow through and further form FFT coded data block (length of FFT coded data block (symbol numbers) is K) after LDPC coding, code element modulation, the constellation rotation on frequency domain;
3) to adopt code check be that FFT coded data block that 1 space-frequency coding device will form on frequency domain is modulated to form on each multimedia broadcasting transmitting set branch road in the single frequency network and emptyly frequently modulates FFT coded data block (empty length (symbol numbers) of modulating the FFT coded data block frequently is K) to the network data management device of single frequency network, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the FFT coded data block frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each multimedia broadcasting transmitting set in the single frequency network adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the FFT coded data block frequently and is transformed to the empty time domain discrete coded data sample value piece of frequently modulating;
5) each multimedia broadcasting transmitting set in the single frequency network is inserted into the empty time domain discrete coded data sample value piece of frequently modulating with Cyclic Prefix (length of Cyclic Prefix is C) at interval as protection, forms the empty discrete coded data sample value piece of time domain cyclic prefix (empty length of modulating the discrete coded data sample value piece of time domain cyclic prefix frequently is (K+C)) of frequently modulating;
6) each multimedia broadcasting transmitting set in the single frequency network forms frame (length of frame is L, L=4 * (K+C)) with continuous 4 empty discrete coded data sample value pieces of time domain cyclic prefix of frequently modulating;
7) each multimedia broadcasting transmitting set in the single frequency network as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitutes the discrete sample block (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X) of sequence of plural training with training sequence on time domain;
8) each multimedia broadcasting transmitting set in the single frequency network is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain, to form signal frame;
9) each multimedia broadcasting transmitting set in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) each multimedia broadcasting transmitting set in the single frequency network forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
11) receiver end receives and handles the signal that each multimedia broadcasting transmitting set in the single frequency network is sent.
2. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1, it is characterized in that: the centre data manager of described single frequency network converts the multi-medium data media data processor of flowing through to data bit flow.
3. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1, it is characterized in that: the network data management device of described single frequency network will import data bit and flow through and further form FFT coded data block (length of FFT coded data block (symbol numbers) is K) after LDPC coding, code element modulation, the constellation rotation on frequency domain.
4. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 3, it is characterized in that: the encoding rate of the LDPC coding of each multimedia broadcasting transmitting set in the described single frequency network is in 1/4,1/2,5/8,3/4 and 7/8.
5. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 3, it is characterized in that: the code element of each multimedia broadcasting transmitting set in the described single frequency network is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM.
6. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 3, it is characterized in that: the symbol constellations figure mapping mode of the code element modulation of each multimedia broadcasting transmitting set in the described single frequency network adopts the Gray code mapping.
7. press a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 3, it is characterized in that: the constellation rotation after the code element modulation of each multimedia broadcasting transmitting set in the described single frequency network in the following way, the constellation rotation angle of QPSK symbol constellations is 22.5 degree, the constellation rotation angle of 16QAM symbol constellations is 11.25 degree, the constellation rotation angle of 64QAM symbol constellations is 5.626 degree, and the constellation rotation angle of 256QAM symbol constellations is 2.8125 degree.
8. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 3, it is characterized in that: the empty frequency of each multimedia broadcasting transmitting set in the described single frequency network is modulated the FFT coded data block and is made up of subcarrier; Sub-carrier number K gets in 2048,4096,8192.
9. press a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 3, it is characterized in that: the empty frequency of each multimedia broadcasting transmitting set in the described single frequency network is modulated the FFT coded data block and is made up of subcarrier, when K got 2048, the frequency interval of subcarrier was got 4KHz; When K got 4096, the frequency interval of subcarrier was got 2KHz; When K got 8192, the frequency interval of subcarrier was got 1KHz.
10. press a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1; It is characterized in that: it is that 1 space-frequency coding device will be modulated at the FFT coded data block that frequency domain forms each multimedia broadcasting transmitting set branch road in the SFN and form and emptyly frequently modulate FFT coded data block (empty length (symbol numbers) of modulating the FFT coded data block frequently is K) that the network data management device of described SFN adopts code check, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all frequently modulated the FFT coded data block to sky at one time and processed to guarantee all emitters in the network.
11. a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method by claim 1 is characterized in that: each multimedia broadcasting transmitting set in the described single frequency network adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the FFT coded data block frequently and is transformed to the empty time domain discrete coded data sample value piece of frequently modulating.
12. a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method by claim 1; it is characterized in that: each multimedia broadcasting transmitting set in the described single frequency network is inserted into the empty time domain discrete coded data sample value piece of frequently modulating with Cyclic Prefix at interval as protection, forms the empty discrete coded data sample value piece of time domain cyclic prefix of frequently modulating.
13. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 12, it is characterized in that: the length of the Cyclic Prefix of each multimedia broadcasting transmitting set in the described single frequency network is C; When K got 2048, C got 1/4 of K size; When K got 4096, C got 1/8 of K size; When K got 8192, C got 1/16 of K size.
14. a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method by claim 1 is characterized in that: each multimedia broadcasting transmitting set in the described single frequency network forms frame with 4 continuous empty discrete coded data sample value pieces of time domain cyclic prefix of frequently modulating.
15. a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method by claim 1, it is characterized in that: each multimedia broadcasting transmitting set in the described single frequency network as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitutes the discrete sample block (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X) of sequence of plural training with training sequence on time domain.
16. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 15, it is characterized in that: the length X of the discrete sample block of the training sequence of each multimedia broadcasting transmitting set in the described single frequency network, operational indicator sequence, sequence of plural training all gets 512.
17. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 15, it is characterized in that: training sequence, the operational indicator sequence of each multimedia broadcasting transmitting set in the described single frequency network have pseudo-random characteristics.
18. by a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method of claim 1 and claim 15, it is characterized in that: training sequence, the operational indicator sequence of each multimedia broadcasting transmitting set in the described single frequency network have orthogonality each other.
19. a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method by claim 1, it is characterized in that: each multimedia broadcasting transmitting set in the described single frequency network is inserted into frame with the discrete sample block (as frame head) of the sequence of plural training that constitutes on the time domain, to form signal frame.
20. a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method by claim 1 is characterized in that: each multimedia broadcasting transmitting set in the described single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped.
21. a kind of multimedia broadcast wireless signal single-frequency network anti-noise transmission method by claim 1 is characterized in that: described receiver end receives handles the signal that each multimedia broadcasting transmitting set in the single frequency network is sent.
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