CN102263732B - Robust wireless signal transmission method for digital broadcasting single frequency network - Google Patents
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Abstract
The invention discloses a robust wireless signal transmission method for a digital broadcasting single frequency network, which is a time domain, frequency domain and space domain hybrid transmission scheme. The method provided by the invention has the advantages of low peak-to-average power ratio, short synchronous time, robustness, controllability in multiple services and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of robust wireless signal transmission method for digital broadcasting single frequency network.
Background technology
The peak-to-average power ratio (PAPR) that OFDM (OFDM) signal is higher has very high requirement to the range of linearity of amplifier and digital to analog converter, the solution that must consider how to reduce the probability of occurrence of large peak power signal in ofdm signal and reduce nonlinear distortion impact.Cascade different coding form can make full use of different coding technological merit; Between coding and code element modulation, insert bit interleaver, can so that coding and modulated process is relatively independent and from different multi-system symbolic numbers, expand diversity order to different binary bits number, thereby the bit error performance that diversity order is improved significantly and has had under multidiameter fading channel.The networking model of employing single frequency network can improve the availability of frequency spectrum of Digital Television digital broadcasting wireless transmitting system greatly.In actual single frequency network communication environment, Digital Television digital broadcasting performance in wireless communication systems is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Digital broadcast single-frequency network robust wireless signal transmitter transmission method is the key technology that realizes reliable digit Television Digital broadcast single frequency network wireless transmission.
Utilizing Digital Television digital 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 Digital broadcast wireless transmissions system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of robust wireless signal transmission method for digital broadcasting single frequency network just, can meet the needs that High Data Rate can be controlled multi-service Digital Television digital broadcast single-frequency network wireless transmission.
Wish is done more deep understanding to 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?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
S.Benedetto，D.Divsalar，G.Montorsi，and?F.Pollara，“Serial?concatenation?of?interleaved?codes：performance?analysis，design，and?iterative?decoding，”IEEE?Trans.Inform.Theory，vol.44，no.3，pp.909-925，May?1998.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service Digital Television digital broadcast single-frequency network wireless transmission problem, proposed a kind of robust wireless signal transmission method for digital broadcasting single frequency network.
A kind of robust wireless signal transmission method for digital broadcasting single frequency network that the present invention proposes, is characterized in that it comprises the following steps:
1) the centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow;
2) the network data management device of single frequency network is by input data bit Bose-Chaudhuri-Hocquenghem Code (the Bose Chaudhuri Hocquenghem that flows through, BCH), Bit Interleave, LDPC (the Low Density Parity Check that encodes, LDPC), code element modulation, symbol interleave form the cascade interweaved coding modulation data piece of FFT on frequency domain, FFT represents fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) the network data management device of single frequency network adopts the space-frequency coding device that code check is 1 that the cascade interweaved coding modulation data piece of the FFT forming on frequency domain is modulated on each digital broadcasting robust wireless signal transmitter branch road in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each digital broadcasting robust wireless signal transmitter branch road is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in assurance network;
4) each digital broadcasting robust wireless signal transmitter in single frequency network adopts IFFT that the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece D
total, IFFT represents fast discrete Fourier inverse transformation;
5) each digital broadcasting robust wireless signal transmitter in single frequency network is divided equally into two by the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece in order, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
1with the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
2, D
total=[D
1, D
2];
6) each digital broadcasting robust wireless signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
1, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
2carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D again
new, the new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
1, D
2], generate pattern 2 is
Generate pattern 3 is
Generate pattern 4 is
Generate pattern 5 is
Generate pattern 6 is
Generate pattern 7 is D
new=[D
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the synthetic cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed piece D of 12 kinds of generate patterns
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls
and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* 1expression is to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
1the cascade interweaved coding modulation data sample value of each sky frequency modulation time domain discrete processed carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains;
7) each digital broadcasting robust wireless signal transmitter in single frequency network inserts using Cyclic Prefix as protection interval and falls the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C, and the length of falling the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece is C+K;
8) the real part sequence of each digital broadcasting robust wireless signal transmitter in single frequency network using training sequence as sequence of plural training, the imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form 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 is all X, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing digital broadcasting robust wireless signal transmitter;
9) each digital broadcasting robust wireless signal transmitter in single frequency network repeats the sequence of plural training discrete sample block forming in time domain continuously to form time domain repetition training series of discrete sample value piece for 2 times in time domain, as frame head;
10) each digital broadcasting robust wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece be frame by time domain repetition training series of discrete sample value piece, to form signal frame;
11) each digital broadcasting robust wireless signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
12) each digital broadcasting robust wireless signal transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
13) radiofrequency signal that each digital broadcasting robust wireless signal transmitter in the detection of the digital broadcasting robust wireless signal receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal.
Robust wireless signal transmission method for digital broadcasting single frequency network according to above-mentioned, is characterized in that: each digital broadcasting robust wireless signal transmitter in single frequency network fall that the signal that the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece undertakies by specific 12 kinds of generate patterns by the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block adds, subtracts, conjugate operation processing and again synthesizing; In the signal frame of each digital broadcasting robust wireless signal transmitter in single frequency network, there is periodic time domain repetition training series of discrete sample value piece; The length X of the training sequence of each digital broadcasting robust wireless signal transmitter in single frequency network is in 512,1024,2048, the length K of the corresponding cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is respectively 2048,4096,8192, the frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively 1/4,1/8,1/16 of the cascade interweaved coding modulation data block length of sky frequency modulation FFT processed K size; The training sequence of each digital broadcasting robust 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 digital broadcasting robust wireless signal transmitter in single frequency network have orthogonality each other; Each different operational indicator sequence of each digital broadcasting robust wireless signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each digital broadcasting robust wireless signal transmitter in single frequency network; The code check of space-frequency coding device is 1; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.Digital broadcasting robust wireless signal receiver in single frequency network can make full use of the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame is carried out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body, processes.
Feature of the present invention:
The present invention is the transmission plan that mix in a kind of time-domain and frequency-domain spatial domain.Of the present invention fall the generate pattern of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece and there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece choosing method falls, but the very high large peak power signal probability of the maximum peak power that not only can make full use 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 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.In the signal frame of each digital broadcasting robust wireless signal transmitter in single frequency network, there is periodic time domain repetition training series of discrete sample value piece, the training sequence of each digital broadcasting robust wireless signal transmitter in single frequency network, operational indicator sequence has pseudo-random characteristics, the training sequence of each digital broadcasting robust wireless signal transmitter in single frequency network, operational indicator sequence has orthogonality each other, the signal frame of each digital broadcasting robust wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece be frame and forming by time domain repetition training series of discrete sample value piece, these have guaranteed that digital broadcasting robust 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.Using Cyclic Prefix as protection interval, insert and fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece to form signal frame body, can reduce the interference effect between the cascade interweaved coding modulation data of signal frame head and frame.Input data are carried out to cascade interweaved coded modulation and improved diversity order, the bit error performance that communication system has been had under multidiameter fading channel.Each different operational indicator sequence of each digital broadcasting robust wireless signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each digital broadcasting robust wireless signal transmitter in single frequency network, can, so that Digital Television digital 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.Transmission method of the present invention has low peak-to-average power ratio, 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 Television digital broadcast single-frequency network wireless transmission.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of signal transmission between the transmitter and receiver of robust wireless signal transmission method for digital broadcasting single frequency network of the present invention.
Fig. 2 is the embodiment schematic diagram forming according to signal frame in signals transmission between the transmitter and receiver of robust wireless signal transmission method for digital broadcasting 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 schematic diagram of signal transmission between the transmitter and receiver of the robust wireless signal transmission method for digital broadcasting single frequency network proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) the centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow;
2) the network data management device of single frequency network forms the cascade interweaved coding modulation data piece of FFT by flow through Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, symbol interleave of input data bit on frequency domain, FFT represents fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode;
3) the network data management device of single frequency network adopts the space-frequency coding device that code check is 1 that the cascade interweaved coding modulation data piece of the FFT forming on frequency domain is modulated on each digital broadcasting robust wireless signal transmitter branch road in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each digital broadcasting robust wireless signal transmitter branch road is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in assurance network;
4) each digital broadcasting robust wireless signal transmitter in single frequency network adopts IFFT that the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece D
total, IFFT represents fast discrete Fourier inverse transformation;
5) each digital broadcasting robust wireless signal transmitter in single frequency network is divided equally into two by the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece in order, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
1with the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
2, D
total=[D
1, D
2];
6) each digital broadcasting robust wireless signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
1, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
2carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D again
new, the new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
1, D
2], generate pattern 2 is
Generate pattern 3 is
Generate pattern 4 is
Generate pattern 5 is
Generate pattern 6 is
Generate pattern 7 is D
new=[D
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the synthetic cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed piece D of 12 kinds of generate patterns
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls
and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* 1expression is to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
1the cascade interweaved coding modulation data sample value of each sky frequency modulation time domain discrete processed carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains;
7) each digital broadcasting robust wireless signal transmitter in single frequency network inserts using Cyclic Prefix as protection interval and falls the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C, and the length of falling the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece is C+K;
8) the real part sequence of each digital broadcasting robust wireless signal transmitter in single frequency network using training sequence as sequence of plural training, the imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form 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 is all X, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing digital broadcasting robust wireless signal transmitter; X gets in 512,1024,2048; When X gets 512, K gets 2048, C and gets 1/4 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed subcarrier is got 4KHz; When X gets 1024, K gets 4096, C and gets 1/8 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed subcarrier is got 2KHz; When X gets 2048, K gets 8192, C and gets 1/16 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed subcarrier is got 1KHz;
9) each digital broadcasting robust wireless signal transmitter in single frequency network repeats the sequence of plural training discrete sample block forming in time domain continuously to form time domain repetition training series of discrete sample value piece for 2 times in time domain, as frame head;
10) each digital broadcasting robust wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece be frame by time domain repetition training series of discrete sample value piece, to form signal frame;
11) each digital broadcasting robust wireless signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
12) each digital broadcasting robust wireless signal transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
13) radiofrequency signal that each digital broadcasting robust wireless signal transmitter in the detection of the digital broadcasting robust wireless signal receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal.
The embodiment that forms (suppose in single frequency network have N transmitter) according to signal frame in signals transmission between the transmitter and receiver of robust wireless signal transmission method for digital broadcasting single frequency network of the present invention, as shown in Figure 2, is specifically implemented as follows:
The centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow.
The network data management device of single frequency network forms the cascade interweaved coding modulation data piece of FFT by flow through Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, symbol interleave of input data bit on frequency domain; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode; Adopt the space-frequency coding device that code check is 1 that the cascade interweaved coding modulation data piece of the FFT forming on frequency domain is modulated on each digital broadcasting robust wireless signal transmitter branch road in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each digital broadcasting robust wireless signal transmitter branch road is all processed at one time to the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed with all transmitters in assurance network; Through IFFT, be transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece again, by peak-to-average power ratio adjustment unit, generate and choose the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of the peak-to-average power ratio piece that falls wherein with minimum peak-to-average power ratio and the generate pattern information of institute's correspondence employing is sent to operational indicator sequence setting unit simultaneously.
Each digital broadcasting robust wireless signal transmitter in single frequency network inserts Cyclic Prefix to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece as protection interval; the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece falls in formation; as frame, the length of Cyclic Prefix is C.The real part sequence of each digital broadcasting robust wireless signal transmitter in single frequency network using training sequence as sequence of plural training, the imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form 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 is all X, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing digital broadcasting robust wireless signal transmitter.Each digital broadcasting robust wireless signal transmitter in single frequency network repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain repetition training series of discrete sample value piece for 2 times in time domain, as frame head.Each digital broadcasting robust wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece be frame by time domain repetition training series of discrete sample value piece, to form signal frame.Each digital broadcasting robust wireless signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame.
The X of each digital broadcasting robust wireless signal transmitter in single frequency network gets in 512,1024,2048; When X gets 512, K gets 2048, C and gets 1/4 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed subcarrier is got 4KHz; When X gets 1024, K gets 4096, C and gets 1/8 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed subcarrier is got 2KHz; When X gets 2048, K gets 8192, C and gets 1/16 of K size, and the frequency interval of the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed subcarrier is got 1KHz; Training sequence, operational indicator sequence as each digital broadcasting robust 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 meets above-mentioned feature can and be realized as walsh sequence, the Hadamard sequences of orthogonal sequence or the orthogonal sequence being produced by other modes by one group of Phase shift m sequence of a kind of specific type as pseudo-random number sequence.Each different operational indicator sequence is comprising and unique each system parameters and business model information of expressing each digital broadcasting robust wireless signal transmitter in single frequency network.When X gets 512, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.1; When X gets 1024, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.05; When X gets 2048, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.025.
Each digital broadcasting robust wireless signal transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave.
The radiofrequency signal that each digital broadcasting robust wireless signal transmitter in digital broadcasting robust wireless signal receiver detection reception single frequency network in single frequency network sends also forms baseband signal by its down-conversion, utilize the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body, process.
By reference to the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to above-described embodiment, in the spirit and scope situation of claim that does not depart from the application, those skilled in the art can make various modifications or remodeling.
Claims (8)
1. a robust wireless signal transmission method for digital broadcasting single frequency network, is characterized in that it comprises the following steps:
1) the centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow;
2) the network data management device of single frequency network forms the cascade interweaved coding modulation data piece of FFT by flow through Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation, symbol interleave of input data bit on frequency domain, BCH represents Bose Chaudhuri Hocquenghem, LDPC represents Low Density Parity Check, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) the network data management device of single frequency network adopts the space-frequency coding device that code check is 1 that the cascade interweaved coding modulation data piece of the FFT forming on frequency domain is modulated on each digital broadcasting robust wireless signal transmitter branch road in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each digital broadcasting robust wireless signal transmitter branch road is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in assurance network;
4) each digital broadcasting robust wireless signal transmitter in single frequency network adopts IFFT that the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece D
total;
5) each digital broadcasting robust wireless signal transmitter in single frequency network is divided equally into two by the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece in order, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
1with the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
2, D
total=[D
1, D
2];
6) each digital broadcasting robust wireless signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
1, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
2carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D again
new, the new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
1, D
2], generate pattern 2 is
Generate pattern 3 is
Generate pattern 4 is
Generate pattern 5 is
Generate pattern 6 is
Generate pattern 7 is D
new=[D
* 1, D
2], generate pattern 8 is
generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
generate pattern 12 is
Compare the synthetic cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed piece D of 12 kinds of generate patterns
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls
and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* 1expression is to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D
1the cascade interweaved coding modulation data sample value of each sky frequency modulation time domain discrete processed carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains;
7) each digital broadcasting robust wireless signal transmitter in single frequency network inserts using Cyclic Prefix as protection interval and falls the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C, and the length of falling the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece is C+K;
8) the real part sequence of each digital broadcasting robust wireless signal transmitter in single frequency network using training sequence as sequence of plural training, the imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form 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 is all X, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing digital broadcasting robust wireless signal transmitter;
9) each digital broadcasting robust wireless signal transmitter in single frequency network repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain repetition training series of discrete sample value piece for 2 times in time domain, as frame head; 10) each digital broadcasting robust wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete cascade interweaving encoding of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio modulating data sample value piece be frame by time domain repetition training series of discrete sample value piece, to form signal frame;
11) each digital broadcasting robust wireless signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
12) each digital broadcasting robust wireless signal transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
13) radiofrequency signal that each digital broadcasting robust wireless signal transmitter in the detection of the digital broadcasting robust wireless signal receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal.
2. by the robust wireless signal transmission method for digital broadcasting 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 digital broadcasting robust wireless signal transmitter in described single frequency network, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the robust wireless signal transmission method for digital broadcasting 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 robust wireless signal transmission method for digital broadcasting single frequency network of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the robust wireless signal transmission method for digital broadcasting single frequency network of claim 1, it is characterized in that: the encoding rate of described LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM and 64QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.
6. by the robust wireless signal transmission method for digital broadcasting single frequency network of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described empty frequency modulation FFT processed is comprised of subcarrier; When X gets 512, K gets 2048, and the frequency interval of subcarrier is got 4KHz; When X gets 1024, K gets 4096, and the frequency interval of subcarrier is got 2KHz; When X gets 2048, K gets 8192, and the frequency interval of subcarrier is got 1KHz.
7. by the robust wireless signal transmission method for digital broadcasting single frequency network of claim 1, it is characterized in that: the length C value of described Cyclic Prefix is relevant with X value; When X gets 512, C gets 1/4 of K size; When X gets 1024, C gets 1/8 of K size; When X gets 2048, C gets 1/16 of K size.
8. by the robust wireless signal transmission method for digital broadcasting single frequency network of claim 1, it is characterized in that: the baseband signal reception & disposal that described digital broadcast single-frequency network robust wireless signal receiver carries out, one of them step is that the time domain and frequency domain combined alternate analysis of signal frame head and signal frame body is processed.
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