CN103763284A - Anti-noise wireless digital broadcast signal transmission method for single frequency network - Google Patents
Anti-noise wireless digital broadcast signal transmission method for single frequency network Download PDFInfo
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Abstract
The invention discloses an anti-noise wireless digital broadcast signal transmission method for a single frequency network. The method is a spatial domain, time domain and frequency domain combined framing modulation scheme. According to the method, based on training sequence optimization design, signal generation mode selection and signal selection, original signals of OFDM signals can be easily obtained on a receiver side through processing and recovery. The method has the advantages of low peak-to-average power ratio, short synchronization time, anti-channel-fading performance, multi-service controllability and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-noise wireless digital broadcast signal transmission method for single frequency network.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital Television anti-noise wireless digital broadcasting transmission system, as the important component part of Digital Television anti-noise wireless digital broadcasting, the development of its correlation technique, closely bound up with people's quality of life, and be therefore subject to people's extensive concern especially.Digital Television anti-noise wireless digital broadcasting correlation technique and related industry thereof are that in Communications And Computer field, development is very fast, the industry of good market prospect.In Digital Television anti-noise wireless digital broadcasting correlation technique, the emphasis that various countries pay close attention to is at present that the Digital Television anti-noise wireless digital broadcasting how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Single-frequency network anti-noise wireless digital broadcasting signal transmitter framing modulation technique is the key technology of Digital Television anti-noise wireless digit broadcasting system, for whole system performance, plays conclusive effect, is the object of everybody primary study.
Due to the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes and becomes more and more easier.Because OFDM Multicarrier Transmission Technology has simple in structure, the availability of frequency spectrum is high, the plurality of advantages such as in the time of can resisting frequency selectivity and channel, becomes and extremely everybody concern obtain deep research and the extensive use in the numerous areas such as Xdsl, wide-band mobile communication, wideband wireless local area network, the digital broadcasting of Digital Television anti-noise wireless.
The peak-to-average power ratio (PAPR) that ofdm signal is higher has very high requirement to the range of linearity of amplifier and digital to analog converter, if system linearity scope can not meet the variation of signal, can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between subchannel to be destroyed, produce phase mutual interference, make system performance degradation.Therefore 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.
Adopt the networking model of single frequency network can greatly improve the availability of frequency spectrum of Digital Television anti-noise wireless digital broadcasting transmission system.In practical communication environment, Digital Television anti-noise wireless digital broadcast communications system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Single-frequency network anti-noise wireless digital broadcasting signal transmitter transmission method is the key technology that realizes the digital broadcasting of reliable digit TV anti-noise wireless.
Utilizing Digital Television anti-noise wireless digital broadcasting transmission 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 TV anti-noise wireless digital broadcasting transmission system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of anti-noise wireless digital broadcast signal transmission method for single frequency network just, can meet High Data Rate and can control multi-service Digital Television anti-noise wireless numeral
The needs of broadcasting transmitting.
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?televi?sion?development，”Proceedings?of?the?IEEE，?Special?Issue?on?Global?Digital?Television：Technology?andEmerging?Services，pp.8-21，Jan.2006.M.S.Richer，G.Reitmeier，T.Gurley，G.A.Jones，J.Whitaker，and?R.Rast.“The?ATSC?digital?television?system，”Proceedings?of?the?IEEE，Special?Issue?onGlobalDigital?Television：Technology?and?Emerging?Services，pp.37-43，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stationary?portable?and?mobile?use，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，?Special?Issue?on?Global?DigitaI?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service Digital Television anti-noise wireless digital broadcasting problem, proposed a kind of anti-noise wireless digital broadcast signal transmission method for single frequency network.
A kind of anti-noise wireless digital broadcast signal transmission method for 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 coded in the input data bit LDPC that flows through on frequency domain and forms FFT coded data block, and LDPC represents low-density checksum, and the length of FFT coded data block is K, and the numerical value of K is got even number;
3) to adopt code check be 1 to the network data management device of single frequency network that space-frequency coding device is modulated to the FFT coded data block forming on frequency domain in each anti-noise wireless digital broadcast signal transmitter branches in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each anti-noise wireless digital broadcast signal transmitter branches is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network;
4) each anti-noise wireless digital broadcast signal transmitter in single frequency network adopts IFFT that FFT coded data block processed empty frequency modulation is transformed to sky frequency modulation time domain discrete coded data processed sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
5) each anti-noise wireless digital broadcast signal transmitter in single frequency network separates successively and generates the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value by time domain discrete coded data sample value piece demultiplexing processed empty frequency modulation and according to the sequencing odd even of each empty frequency modulation time domain discrete coded data processed sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
even=[d
1, d
3..., d
k-3, d
k-1];
6) each anti-noise wireless digital broadcast signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value
very, the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete coded data processed sample value piece D again
new, new empty frequency modulation time domain discrete coded data processed sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], 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
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of empty frequency modulation time domain discrete coded data processed sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece falls
and the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryexpression is to the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value
veryeach empty frequency modulation time domain discrete coded data processed sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete coded data processed sample value sub-block that obtains; D
* evenexpression is to the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
eveneach empty frequency modulation time domain discrete coded data processed sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete coded data processed sample value sub-block that obtains;
7) each anti-noise wireless digital broadcast signal transmitter Insert service index series after training sequence in single frequency network forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise wireless digital broadcasting signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece of training sequence discrete sample block;
8) each anti-noise wireless digital broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete coded data processed sample value piece, as frame;
9) each anti-noise wireless digital broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each anti-noise wireless digital broadcast signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each anti-noise wireless digital broadcast 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;
12) radiofrequency signal that each anti-noise wireless digital broadcast signal transmitter in the detection of the anti-noise wireless digital broadcasting signal receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal.
According to each anti-noise method for transmitting wireless digital broadcast signal in above-mentioned single frequency network, it is characterized in that: each anti-noise wireless digital broadcast signal transmitter in single frequency network the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece falls by empty frequency modulation time domain discrete coded data processed sample value piece demultiplexing and separate successively the strange sub-block of empty frequency modulation time domain discrete coded data processed sample value of generation and empty frequency modulation time domain discrete coded data processed sample value idol sub-block according to the sequencing odd even of each empty frequency modulation time domain discrete coded data processed sample value and carry out signal power adjustment and corresponding signal and process and pass through 18 kinds of generate patterns of particular design and again synthesize; The training sequence of each anti-noise wireless digital broadcast signal transmitter in single frequency network is comprised of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8; The circulating prefix-length C of each anti-noise wireless digital broadcast signal transmitter signal frame in single frequency network is 1/16 of FFT coded data block length K; The operational indicator sequence of each anti-noise wireless digital broadcast signal transmitter in single frequency network has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of each anti-noise wireless digital broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise wireless digital broadcasting signal transmitter; The FFT coded data block of each anti-noise wireless digital broadcast signal transmitter in single frequency network is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The code check of space-frequency coding device is 1; The encoding rate that input data is carried out to LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8.Feature of the present invention:
The present invention is the framing modulation scheme that a kind of spatial domain time-domain and frequency-domain mixes.Empty frequency modulation of the present invention time domain discrete coded data processed sample value piece demultiplexing also separates successively and generates the empty frequency modulation strange sub-block of time domain discrete coded data processed sample value and the even sub-block of empty frequency modulation time domain discrete coded data processed sample value and the corresponding signal power adjustment of carrying out and signal processing according to the sequencing odd even of each empty frequency modulation time domain discrete coded data processed sample value, what by particular design 18 kinds fell the generate pattern of the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece and had a minimum peak-to-average power ratio falls peak-to-average power ratio sky frequency modulation time domain discrete coded data processed sample value piece choosing method, 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 power regularity of distribution that the characteristic that the real part (or imaginary part) of the ofdm signal when number of sub carrier wave is larger is multiple Gaussian random process and whose amplitude obeys Rayleigh distribution and then low complex degree ground effectively change over frame signal reaches the object that reduces peak-to-average power ratio, 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.Training sequence in the signal frame of each anti-noise wireless digital broadcast signal transmitter in single frequency network is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, it is by falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece that the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece falls in the time domain embedding training sequence of each anti-noise wireless digital broadcast signal transmitter in single frequency network, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that single-frequency network anti-noise wireless digital broadcasting 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 time domain embedding training sequence and fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece to form signal frame, can reduce the interference effect between adjacent signals frame.Adopt LDPC coding to carry out chnnel coding to input data the error-correcting performance that approaches shannon limit is provided.Each different operational indicator sequence of each anti-noise wireless digital broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise wireless digital broadcasting signal transmitter, can make Digital Television anti-noise wireless digital broadcasting transmission 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 anti-noise wireless digital broadcast transmission.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of the single frequency network transmitter of anti-noise wireless digital broadcast signal transmission method for single frequency network of the present invention.
Fig. 2 is according to the embodiment schematic diagram of the single frequency network transmitter signal framing modulation of anti-noise wireless digital broadcast signal transmission method for single frequency network of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The embodiment of the single frequency network transmitter of the anti-noise wireless digital broadcast signal transmission method for 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 is coded in the input data bit LDPC that flows through on frequency domain and forms FFT coded data block, and LDPC represents low-density checksum, and the length of FFT coded data block is K, and the numerical value of K is got even number; The encoding rate that input data is carried out to LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8;
3) to adopt code check be 1 to the network data management device of single frequency network that space-frequency coding device is modulated to the FFT coded data block forming on frequency domain in each anti-noise wireless digital broadcast signal transmitter branches in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each anti-noise wireless digital broadcast signal transmitter branches is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network;
4) each anti-noise wireless digital broadcast signal transmitter in single frequency network adopts IFFT that FFT coded data block processed empty frequency modulation is transformed to sky frequency modulation time domain discrete coded data processed sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
5) each anti-noise wireless digital broadcast signal transmitter in single frequency network separates successively and generates the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value by time domain discrete coded data sample value piece demultiplexing processed empty frequency modulation and according to the sequencing odd even of each empty frequency modulation time domain discrete coded data processed sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
even=[d
1, d
3..., d
k-3, d
k-1];
6) each anti-noise wireless digital broadcast signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value
very, the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete coded data processed sample value piece D again
new, new empty frequency modulation time domain discrete coded data processed sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], 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
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of empty frequency modulation time domain discrete coded data processed sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece falls
and the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryexpression is to the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value
veryeach empty frequency modulation time domain discrete coded data processed sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete coded data processed sample value sub-block that obtains; D
* evenexpression is to the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
eveneach empty frequency modulation time domain discrete coded data processed sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete coded data processed sample value sub-block that obtains;
7) each anti-noise wireless digital broadcast signal transmitter Insert service index series after training sequence in single frequency network forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise wireless digital broadcasting signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece of training sequence discrete sample block;
8) each anti-noise wireless digital broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete coded data processed sample value piece, as frame;
9) each anti-noise wireless digital broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each anti-noise wireless digital broadcast signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each anti-noise wireless digital broadcast 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;
12) radiofrequency signal that each anti-noise wireless digital broadcast signal transmitter in the detection of the anti-noise wireless digital broadcasting signal receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal.
According to the embodiment of the single frequency network transmitter signal framing modulation of anti-noise wireless digital broadcast signal transmission method for single frequency network of the present invention, as shown in Figure 2, be 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 is coded in the input data bit LDPC that flows through on frequency domain and forms FFT coded data block, and LDPC represents low-density checksum; To adopt code check be 1, and space-frequency coding device is modulated to the FFT coded data block forming on frequency domain in each anti-noise wireless digital broadcast signal transmitter branches in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each anti-noise wireless digital broadcast signal transmitter branches is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network; Through IFFT, be transformed to sky frequency modulation time domain discrete coded data processed sample value piece again, by peak-to-average power ratio adjustment unit, generate and choose the empty frequency modulation of the peak-to-average power ratio time domain discrete coded data processed sample value 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.
Empty frequency modulation FFT coded data block processed is comprised of subcarrier.The length of empty frequency modulation FFT coded data block processed is K, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate that input data is carried out to LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8.
The training sequence of each anti-noise wireless digital broadcast signal transmitter in single frequency network is comprised of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8.
Each anti-noise wireless digital broadcast signal transmitter Insert service index series after training sequence in single frequency network forms time domain and embeds training sequence discrete sample block in time domain.
The operational indicator sequence of each anti-noise wireless digital broadcast signal transmitter in single frequency network has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of each anti-noise wireless digital broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise wireless digital broadcasting signal transmitter.
The time domain of each anti-noise wireless digital broadcast signal transmitter in single frequency network embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece of training sequence discrete sample block; Each anti-noise wireless digital broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete coded data processed sample value piece, as frame; Each anti-noise wireless digital broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C; The circulating prefix-length C of each anti-noise wireless digital broadcast signal transmitter signal frame in single frequency network is 1/16 of FFT coded data block length K.
Each anti-noise wireless digital broadcast signal transmitter in single frequency network adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
Each anti-noise wireless digital broadcast 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 anti-noise wireless digital broadcast signal transmitter in anti-noise wireless digital broadcasting signal receiver detection reception single frequency network in single frequency network sends also forms baseband signal by its down-conversion, utilize the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis processing to signal frame head and signal frame body.
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 (6)
1. an anti-noise wireless digital broadcast signal transmission method for 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 is coded in the input data bit LDPC that flows through on frequency domain and forms FFT coded data block, and LDPC represents low-density checksum, and the length of FFT coded data block is K, and the numerical value of K is got even number;
3) to adopt code check be 1 to the network data management device of single frequency network that space-frequency coding device is modulated to the FFT coded data block forming on frequency domain in each anti-noise wireless digital broadcast signal transmitter branches in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each anti-noise wireless digital broadcast signal transmitter branches is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network;
4) each anti-noise wireless digital broadcast signal transmitter in single frequency network adopts IFFT that FFT coded data block processed empty frequency modulation is transformed to sky frequency modulation time domain discrete coded data processed sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
5) each anti-noise wireless digital broadcast signal transmitter in single frequency network separates successively and generates the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value by time domain discrete coded data sample value piece demultiplexing processed empty frequency modulation and according to the sequencing odd even of each empty frequency modulation time domain discrete coded data processed sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
even=[d
1, d
3..., d
k-3, d
k-1];
6) each anti-noise wireless digital broadcast signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value
very, the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete coded data processed sample value piece D again
new, new empty frequency modulation time domain discrete coded data processed sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], 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
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of empty frequency modulation time domain discrete coded data processed sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece falls
and the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
*very represent the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value
veryeach empty frequency modulation time domain discrete coded data processed sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete coded data processed sample value sub-block that obtains; D
* evenexpression is to the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
eveneach empty frequency modulation time domain discrete coded data processed sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete coded data processed sample value sub-block that obtains;
7) each anti-noise wireless digital broadcast signal transmitter Insert service index series after training sequence in single frequency network forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise wireless digital broadcasting signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece of training sequence discrete sample block;
8) each anti-noise wireless digital broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete coded data processed sample value piece, as frame;
9) each anti-noise wireless digital broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each anti-noise wireless digital broadcast signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each anti-noise wireless digital broadcast 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;
12) radiofrequency signal that each anti-noise wireless digital broadcast signal transmitter in the detection of the anti-noise wireless digital broadcasting signal receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal.
2. by the anti-noise wireless digital broadcast signal transmission method for single frequency network of claim 1, it is characterized in that: described training sequence is comprised of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A.
3. by the anti-noise wireless digital broadcast signal transmission method for single frequency network of claim 1, it is characterized in that: described C gets 1/16 of K; Described G gets 1/8 of L.
4. by the anti-noise wireless digital broadcast signal transmission method for single frequency network of claim 1, it is characterized in that: described operational indicator sequence has pseudo-random characteristics, by one group of Phase shift m sequence, realized.
5. by the anti-noise wireless digital broadcast signal transmission method for single frequency network of claim 1, it is characterized in that: described FFT coded data block is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate that input data is carried out to LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8.
6. by the anti-noise wireless digital broadcast signal transmission method for single frequency network of claim 1, it is characterized in that: the baseband signal reception & disposal that described single-frequency network anti-noise wireless digital broadcasting signal receiver carries out, one of them step is the time domain and frequency domain combined alternate analysis processing of signal frame head and signal frame body.
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