CN101778073B - Multimedia broadcast wireless signal single-frequency network anti-fading transmission method - Google Patents
Multimedia broadcast wireless signal single-frequency network anti-fading transmission method Download PDFInfo
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Abstract
The invention discloses a multimedia broadcast wireless signal single-frequency network anti-fading transmission method. In the multimedia broadcast wireless signal single-frequency network anti-fading 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 RS coding, convolution interleaving, LDPC coding, code element modulation, constellation rotation, code element interleaving, 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 the single-frequency network. The multimedia broadcast wireless signal single-frequency network anti-fading 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-fading transmission method.
Background technology
At present, wireless videocast develops to the digitlization direction from simulation gradually.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 received 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 passes the wireless implementation of reliable high-speed mobile cheaply that provides of digital television broadcasting under the environment.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 is high, plurality of advantages such as becomes in the time of can resisting frequency selectivity and channel 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 practical communication environment, the digital television broadcasting performance in wireless communication systems receives 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.
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.In information sequence, embed redundancy symbol, the effect of channel coding technology through redundancy symbol reduces signal and in transmission course, makes a mistake, thereby improves the reliability of communication system.
Under multidiameter fading channel, can be through outer coding, interior coding, interweave and the cascade optimal design of modulation scheme reaches big as far as possible signal diversifying exponent number, so that in equaling or exceeding the symbol sebolic addressing of minimum free distance, obtain independent decline.Cascade different coding form can make full use of the advantage of different coding technology; Between coding and code element modulation, insert bit interleaver; Can be so that coding be relatively independent with modulated process and expand diversity order to different binary bits number from different multi-system symbolic numbers, thus make diversity order be improved significantly and under multidiameter fading channel, have the bit error performance of getting well.
Multiple antenna communication uses a plurality of (N
tIndividual) transmitting antenna and one or more (N
rIndividual) reception antenna carries out transfer of data, and it is through with N
tIndividual transmitting antenna sends different data and improves system throughput or improve the reliability of communication through send data redundantly.Transmit diversity is utilized in the redundant transmission of the enterprising line data of combination of space, frequency, time or these dimensions; Simple transmit diversity through at the transmitter and receiver place is handled, thereby the reliability that can improve the communication system data transmission makes communication system obtain stronger performance.Simultaneously, the networking model of employing SFN (that is, the same time of several transmitting stations is launched same signal to realize the reliable covering to certain coverage on same frequency) can improve the availability of frequency spectrum of multimedia broadcasting wireless transmitting system greatly.
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-fading 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-fading transmission method.
A kind of multimedia broadcast wireless signal single-frequency network anti-fading transmission method that the present invention proposes is characterized in that multimedia broadcast wireless signal each multimedia broadcasting transmitting set in SFN is sent to the on-air radio channel and handles the signal that each multimedia broadcasting transmitting set in the SFN is sent by the receiver end reception through following steps:
1) the centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow;
2) the network data management device of SFN will be imported the data bit RS coding (Reed-Solomon that flows through; RS), convolutional interleave, LDPC coding (Low Density Parity Check, LDPC), further on frequency domain, form the cascade interweaved coding modulation data piece of FFT (length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K) after the code element modulation, constellation rotation, symbol interleave;
3) to adopt code check be that the cascade interweaved coding modulation data piece of FFT 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 SFN and emptyly frequently modulates the cascade interweaved coding modulation data piece of FFT (empty length (symbol numbers) of modulating the cascade interweaved coding modulation data piece of FFT frequently is K) to the network data management device of SFN, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the cascade interweaved coding modulation data piece of FFT frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each multimedia broadcasting transmitting set in the SFN adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the cascade interweaved coding modulation data piece of FFT frequently and is transformed to the empty cascade interweaved coding modulation data sample value of the time domain discrete piece of frequently modulating;
5) each multimedia broadcasting transmitting set in the SFN is inserted into the empty cascade interweaved coding modulation data sample value of the time domain discrete piece of frequently modulating with Cyclic Prefix (length of Cyclic Prefix is C) as protection at interval, forms the empty discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix (empty length of modulating the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix frequently is (K+C)) of frequently modulating;
6) each multimedia broadcasting transmitting set in the SFN forms frame (length of frame is L, L=4 * (K+C)) with continuous 4 empty discrete cascade interweaving encoding modulating data sample value pieces of time domain cyclic prefix of frequently modulating;
7) each multimedia broadcasting transmitting set in the SFN 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 SFN 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 SFN adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) each multimedia broadcasting transmitting set in the SFN is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel;
11) receiver end receives and handles the signal that each multimedia broadcasting transmitting set in the SFN is sent.
Multimedia broadcast wireless signal single-frequency network anti-fading transmission method according to above-mentioned is characterized in that: the centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow; The network data management device of SFN will be imported the data bit RS coding (Reed-Solomon that flows through; RS), convolutional interleave, LDPC (the Low Density Parity Check that encodes; LDPC), further on frequency domain, form the cascade interweaved coding modulation data piece of FFT (length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT be K) after the code element modulation, constellation rotation, symbol interleave, RS coding and convolutional interleave combine and have very strong antiburst error ability, wherein; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping, and 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, and symbol interleave adopts the random interleaving mode; It is that the cascade interweaved coding modulation data piece of FFT 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 SFN and emptyly frequently modulates the cascade interweaved coding modulation data piece of FFT (empty length (symbol numbers) of modulating the cascade interweaved coding modulation data piece of FFT frequently is K) that the network data management device of SFN adopts code check, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the cascade interweaved coding modulation data piece of FFT frequently to sky at one time and handled to guarantee all transmitters in the network; Each multimedia broadcasting transmitting set in the SFN adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the cascade interweaved coding modulation data piece of FFT frequently and is transformed to the empty cascade interweaved coding modulation data sample value of the time domain discrete 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 SFN; Length (symbol numbers) X of the training sequence of each multimedia broadcasting transmitting set in the SFN is 512; Empty length (symbol numbers) K (sub-carrier number) that modulates the cascade interweaved coding modulation data piece of FFT frequently of each multimedia broadcasting transmitting set in the SFN 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 cascade interweaved coding modulation data block length of the FFT K size of frequently modulating; The training sequence of each multimedia broadcasting transmitting set in the SFN, 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 SFN have orthogonality each other; Each different service index series of each multimedia broadcasting transmitting set in the SFN is comprising and unique each system parameters and business model information of expressing the multimedia broadcasting transmitting set; Each multimedia broadcasting transmitting set in the SFN adopts square root raised cosine filter that the signal pulse of signal frame is shaped; Each multimedia broadcasting transmitting set in the SFN is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel; Receiver end receives handles the signal that each multimedia broadcasting transmitting set in the SFN is sent.
Characteristics of the present invention:
The present invention is the anti-fading transmission plan of signal diversifying that a kind of spatial domain time-domain and frequency-domain mixes.The centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow; The network data management device of SFN will be imported the data bit RS coding (Reed-Solomon that flows through; RS), convolutional interleave, LDPC coding (Low Density Parity Check, LDPC), further on frequency domain, form the cascade interweaved coding modulation data piece of FFT after the code element modulation, constellation rotation, symbol interleave; It is that the cascade interweaved coding modulation data piece of FFT 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 SFN and emptyly frequently modulates the cascade interweaved coding modulation data piece of FFT (empty length (symbol numbers) of modulating the cascade interweaved coding modulation data piece of FFT frequently is K) that the network data management device of SFN adopts code check, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the cascade interweaved coding modulation data piece of FFT frequently to sky at one time and handled to guarantee all transmitters in the network.The network data management device of SFN adopts the LDPC coding that the input data bit flow is carried out chnnel coding the error-correcting performance near shannon limit is provided.The code element modulation of the network data management device of SFN provides the signal diversifying effect with constellation rotation.The network data management device of SFN adopts and encodes outward, interweaves, the cascade optimal design of interior coding, modulation, constellation rotation, interleaving scheme is carried out cascade interweaved coded modulation to the input data and improved signal diversifying exponent number and anti-interference noise error correcting capability; Make communication system under multidiameter fading channel, have good bit error performance, make communication system have anti-fading property the transmission environment background.Has periodic time-domain training sequence discrete sample block in the signal frame of each multimedia broadcasting transmitting set in the SFN; Training sequence, the operational indicator sequence of each multimedia broadcasting transmitting set in the SFN have pseudo-random characteristics; Training sequence, the operational indicator sequence of each multimedia broadcasting transmitting set in the SFN have orthogonality each other; Each multimedia broadcasting transmitting set in the SFN 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 that frame synchronization, Frequency Synchronization, time synchronized, channel transfer characteristic are estimated and phase noise and channel transfer characteristic are reliably followed the tracks of fast and accurately.Each multimedia broadcasting transmitting set in the SFN adopts and encodes outward, interweaves, the cascade optimal design of interior coding and modulation scheme is carried out cascade interweaved coded modulation to the input data and improved signal diversifying exponent number and anti-interference noise error correcting capability; Make communication system under multidiameter fading channel, have good bit error performance, make communication system have anti-fading property the transmission environment background.Each multimedia broadcasting transmitting set in the SFN is inserted into the empty cascade interweaved coding modulation data sample value of the time domain discrete piece of frequently modulating with Cyclic Prefix at interval as protection and forms the empty discrete cascade interweaving encoding modulating 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 SFN forms the efficient that frame can be carried multi-media broadcasting system with 4 continuous empty discrete cascade interweaving encoding modulating data sample value pieces of time domain cyclic prefix of frequently modulating.The code element modulation of each multimedia broadcasting transmitting set in the SFN provides the signal diversifying effect with constellation rotation.Each different service index series of each multimedia broadcasting transmitting set in the SFN 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-fading transmission method of the present invention have receive lock in time short, clock jitter is little, anti-channel fading, anti-channel disturbance, plurality of advantages such as High Data Rate may command multi-service digital television broadcasting wireless transmission can be provided.
Description of drawings
Fig. 1 is the embodiment sketch map according to signal transmission between the transmitter and receiver of multimedia broadcast wireless signal single-frequency network anti-fading transmission method of the present invention.
Fig. 2 is the embodiment sketch map that forms according to signal frame in the signals transmission between the transmitter and receiver of multimedia broadcast wireless signal single-frequency network anti-fading transmission method of the present invention.
Fig. 3 is the embodiment sketch map 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 SFN of multimedia broadcast wireless signal single-frequency network anti-fading transmission method of the present invention.
Embodiment
To combine accompanying drawing that specific embodiment of the present invention is described in detail below.
The embodiment of signal transmission between the transmitter and receiver of the multimedia broadcast wireless signal single-frequency network anti-fading transmission method that proposes according to the present invention; As shown in Figure 1, multimedia broadcast wireless signal each multimedia broadcasting transmitting set in SFN is sent to the on-air radio channel and handles the signal that each multimedia broadcasting transmitting set in the SFN is sent by the receiver end reception through following steps:
1) the centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow;
2) the network data management device of SFN will be imported the data bit RS coding (Reed-Solomon that flows through; RS), convolutional interleave (RS of the network data management device of SFN coding combines with convolutional interleave and has very strong antiburst error ability), LDPC (the Low Density Parity Check that encodes; LDPC) (the data bit of the network data management device of the SFN RS coding (Reed-Solomon that flows through; RS), the encoding rate of the LDPC behind convolutional interleave coding is in 1/4,1/2,5/8,3/4 and 7/8), the code element modulation (data bit of the network data management device of the SFN RS coding (Reed-Solomon that flows through; RS), the code element behind convolutional interleave, the LDPC coding is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM; The mapping of symbol constellations figure mapping mode employing Gray code), (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), (length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K further on frequency domain, to form the cascade interweaved coding modulation data piece of FFT after the symbol interleave (symbol interleave adopt random interleaving mode); Length (symbol numbers) K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT gets in 2048,4096,8192; Get 2048 when the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT, the frequency interval of corresponding subcarrier is got 4KHz; Get 4096 when the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT, the frequency interval of corresponding subcarrier is got 2KHz; Get 8192 when the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT, the frequency interval of corresponding subcarrier is got 1KHz);
3) to adopt code check be that the cascade interweaved coding modulation data piece of FFT 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 SFN and emptyly frequently modulates the cascade interweaved coding modulation data piece of FFT (empty length (symbol numbers) of modulating the cascade interweaved coding modulation data piece of FFT frequently is K) to the network data management device of SFN, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the cascade interweaved coding modulation data piece of FFT frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each multimedia broadcasting transmitting set in the SFN adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the cascade interweaved coding modulation data piece of FFT frequently and is transformed to the empty cascade interweaved coding modulation data sample value of the time domain discrete piece of frequently modulating;
5) (length of Cyclic Prefix is C to each multimedia broadcasting transmitting set in the SFN with Cyclic Prefix; Frequently modulate the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT when sky and get 2048, corresponding circulating prefix-length C is empty 1/4 of the cascade interweaved coding modulation data block length of the FFT K size of frequently modulating; Frequently modulate the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT when sky and get 4096, corresponding circulating prefix-length C is empty 1/8 of the cascade interweaved coding modulation data block length of the FFT K size of frequently modulating; Frequently modulate the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT when sky and get 8192; Corresponding circulating prefix-length C for empty frequently modulate the cascade interweaved coding modulation data block length of FFT K size 1/16) be inserted into the empty cascade interweaved coding modulation data sample value of the time domain discrete piece of frequently modulating at interval as protection, form the empty discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix (empty length of modulating the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix frequently is (K+C)) of frequently modulating;
6) each multimedia broadcasting transmitting set in the SFN forms frame (length of frame is L, L=4 * (K+C)) with continuous 4 empty discrete cascade interweaving encoding modulating 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 SFN on time domain with training sequence; The length of training sequence (symbol numbers) X gets 512);
8) each multimedia broadcasting transmitting set in the SFN 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 SFN adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) each multimedia broadcasting transmitting set in the SFN is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel;
11) receiver end receives and handles the signal that each multimedia broadcasting transmitting set in the SFN is sent.
According to the embodiment that signal frame in the signals transmission between the transmitter and receiver of multimedia broadcast wireless signal single-frequency network anti-fading transmission method of the present invention forms, as shown in Figure 2, practical implementation is following:
The centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow.
The network data management device of SFN will be imported the data bit RS coding (Reed-Solomon that flows through; RS), convolutional interleave, LDPC coding (Low Density Parity Check, LDPC), further on frequency domain, form the cascade interweaved coding modulation data piece of FFT (length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K) after the code element modulation, constellation rotation, symbol interleave.
The cascade interweaved coding modulation data piece of FFT is made up of subcarrier.The length (symbol numbers) of the cascade interweaved coding modulation data piece of FFT is K; K (sub-carrier number) gets in 2048,4096,8192; Get 2048 when the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT, the frequency interval of corresponding subcarrier is got 4KHz; Get 4096 when the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT, the frequency interval of corresponding subcarrier is got 2KHz; Get 8192 when the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT, the frequency interval of corresponding subcarrier is got 1KHz.
It is that the cascade interweaved coding modulation data piece of FFT 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 SFN and emptyly frequently modulates the cascade interweaved coding modulation data piece of FFT (empty length (symbol numbers) of modulating the cascade interweaved coding modulation data piece of FFT frequently is K) that the network data management device of SFN adopts code check, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the cascade interweaved coding modulation data piece of FFT frequently to sky at one time and handled to guarantee all transmitters in the network.
Each multimedia broadcasting transmitting set in the SFN adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the cascade interweaved coding modulation data piece of FFT frequently and is transformed to the empty cascade interweaved coding modulation data sample value of the time domain discrete piece of frequently modulating.
Each multimedia broadcasting transmitting set in the SFN is inserted into the empty cascade interweaved coding modulation data sample value of the time domain discrete piece of frequently modulating with Cyclic Prefix (length of Cyclic Prefix is C) as protection at interval, forms the empty discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix (empty length of modulating the discrete cascade interweaving encoding modulating 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 the cascade interweaved coding modulation data piece of FFT when sky and get 2048, corresponding circulating prefix-length C is empty 1/4 of the cascade interweaved coding modulation data block length of the FFT K size of frequently modulating; Frequently modulate the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT when sky and get 4096, corresponding circulating prefix-length C is empty 1/8 of the cascade interweaved coding modulation data block length of the FFT K size of frequently modulating; Frequently modulate the length K (sub-carrier number) of the cascade interweaved coding modulation data piece of FFT when sky and get 8192, corresponding circulating prefix-length C is empty 1/16 of the cascade interweaved coding modulation data block length of the FFT K size of frequently modulating.
Each multimedia broadcasting transmitting set in the SFN forms frame with 4 continuous empty discrete cascade interweaving encoding modulating data sample value pieces of time domain cyclic prefix of frequently modulating.
Each multimedia broadcasting transmitting set in the SFN 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 SFN 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 characteristic 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 service index series is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting transmitting set in the SFN.
Each multimedia broadcasting transmitting set in the SFN 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 SFN 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 SFN is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel.
Receiver end receives handles the signal that each multimedia broadcasting transmitting set in the SFN is sent.
The embodiment of the QPSK code element modulation of each multimedia broadcasting transmitting set in the SFN of the multimedia broadcast wireless signal single-frequency network anti-fading transmission method that proposes according to the present invention, the constellation rotation method of 16QAM code element modulation; As shown in Figure 3, the QPSK code element modulation of each multimedia broadcasting transmitting set in the SFN, the symbol constellations figure mapping mode of 16QAM code element modulation adopt 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.
Combine accompanying drawing that specific embodiment of the present invention is specified 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 (4)
1. multimedia broadcast wireless signal single-frequency network anti-fading transmission method is characterized in that multimedia broadcast wireless signal each multimedia broadcasting transmitting set in SFN 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 SFN is sent:
1) the centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow;
2) the network data management device of SFN will be imported data bit and flow through and further on frequency domain, form the cascade interweaved coding modulation data piece of FFT after RS coding, convolutional interleave, LDPC coding, code element modulation, constellation rotation, the symbol interleave; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM, the 256QAM; The symbol constellations figure mapping mode of code element modulation adopts the Gray code mapping; The constellation rotation angle of QPSK symbol constellations is 22.5 degree; 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; RS representes that Reed-Solomon is a Read-Solomon; LDPC representes that Low Density Parity Check is a low-density checksum, and FFT representes the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) to adopt code check be that the cascade interweaved coding modulation data piece of FFT 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 SFN and emptyly frequently modulates the cascade interweaved coding modulation data piece of FFT to the network data management device of SFN, and the time synchronized of adjusting each multimedia broadcasting transmitting set branch road is all modulated the cascade interweaved coding modulation data piece of FFT frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each multimedia broadcasting transmitting set in the SFN adopts IFFT that sky is modulated the cascade interweaved coding modulation data piece of FFT frequently to be transformed to and emptyly frequently to modulate the cascade interweaved coding modulation data sample value of time domain discrete piece, and IFFT representes the fast discrete Fourier inverse transformation;
5) each multimedia broadcasting transmitting set in the SFN is inserted into the empty cascade interweaved coding modulation data sample value of the time domain discrete piece of frequently modulating with Cyclic Prefix as protection at interval; Form the empty discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix of frequently modulating; The length of Cyclic Prefix is C, and empty length of modulating the discrete cascade interweaving encoding modulating data sample value piece of time domain cyclic prefix frequently is K+C;
6) each multimedia broadcasting transmitting set in the SFN forms frame with 4 continuous empty discrete cascade interweaving encoding modulating data sample value pieces of time domain cyclic prefix of frequently modulating, and the length of frame is L, L=4 * (K+C);
7) each multimedia broadcasting transmitting set in the SFN with training sequence as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training; On time domain, constitute the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X;
8) each multimedia broadcasting transmitting set in the SFN is inserted into frame with the discrete sample block of the sequence of plural training that constitutes on the time domain as frame head, to form signal frame;
9) each multimedia broadcasting transmitting set in the SFN adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) each multimedia broadcasting transmitting set in the SFN is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel;
11) receiver end receives and handles the signal that each multimedia broadcasting transmitting set in the SFN is sent.
2. by a kind of multimedia broadcast wireless signal single-frequency network anti-fading transmission method of claim 1, it is characterized in that: the flow through encoding rate of the LDPC coding behind RS coding, the convolutional interleave of the data bit of the network data management device of said SFN is in 1/4,1/2,5/8,3/4 and 7/8.
3. by a kind of multimedia broadcast wireless signal single-frequency network anti-fading transmission method of claim 1, it is characterized in that: the data bit of the network data management device of the said SFN symbol interleave of carrying out after RS coding, convolutional interleave, LDPC coding, code element modulation, the constellation rotation of flowing through adopts the random interleaving mode.
4. by a kind of multimedia broadcast wireless signal single-frequency network anti-fading transmission method of claim 1, 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 said SFN, operational indicator sequence, sequence of plural training all gets 512; Training sequence, operational indicator sequence have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.
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| CN102291357B (en) * | 2011-08-22 | 2013-09-25 | 宁波大学 | Anti-fading multimedia mobile broadcast signal framing modulation method |
| CN102271113B (en) * | 2011-08-22 | 2013-08-21 | 宁波大学 | Anti-interference transmission method for digital broadcast mobile signal |
| CN102281232B (en) * | 2011-08-22 | 2013-09-25 | 宁波大学 | Multimedia broadcast mobile signal anti-noise framing modulation method |
| CN102255852B (en) * | 2011-08-22 | 2013-09-25 | 宁波大学 | Anti-fading wireless digital broadcast signal transmitting method |
| CN102281238B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Anti-fading method for transmitting digital wireless broadcast signal |
| CN102263757B (en) * | 2011-08-22 | 2014-03-26 | 宁波大学 | Anti-fading mobile signal transmission method for digital broadcast single-frequency network |
| CN102255850B (en) * | 2011-08-22 | 2013-09-25 | 宁波大学 | Wireless multimedia broadcast signal framing modulation method for single frequency network |
| CN102263741B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Method for framing and modulating anti-fading mobile multimedia broadcasting signal of single frequency network |
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| CN102255862B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Method for transmitting digital mobile broadcast signal |
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