CN103780547A - Anti-noise wireless signal framing modulation method for single frequency network in multimedia broadcasting - Google Patents
Anti-noise wireless signal framing modulation method for single frequency network in multimedia broadcasting Download PDFInfo
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- CN103780547A CN103780547A CN201410024013.2A CN201410024013A CN103780547A CN 103780547 A CN103780547 A CN 103780547A CN 201410024013 A CN201410024013 A CN 201410024013A CN 103780547 A CN103780547 A CN 103780547A
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Abstract
The invention discloses an anti-noise wireless signal framing modulation method for a single frequency network in multimedia broadcasting. The anti-noise wireless signal framing modulation method for the single frequency network in multimedia broadcasting is a framing modulation scheme of mixed space domains, time domains and frequency domains, comprises a training sequence optimized design, a signal generation mode and a signal selection method, obtains original signals of OFDM signals easily at a receiver end through processing and recovery, and has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, controllable in multiple service and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network.
Background technology
Digital TV multimedia broadcast single frequency network wireless transmitting system, as the important component part of Digital Television radio multimedium broadcast, 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 radio multimedium broadcast 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 radio multimedium broadcast correlation technique, the emphasis that various countries pay close attention to is at present that the Digital Television radio multimedium broadcast how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Multimedia broadcasting single-frequency network anti-noise wireless signal transmitter framing modulation technique is the key technology of Digital Television wireless multimedia broadcasting system, plays conclusive effect for whole system performance, 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 can resist frequency selectivity and channel time, becomes and extremely everybody concern obtain deep research and extensive use in the numerous areas such as Xdsl, wide-band mobile communication, wideband wireless local area network, the broadcast of Digital Television radio multimedium.
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 (, the same time of several transmitting stations is launched same signal to realize the reliable covering to certain coverage in same frequency) of single frequency network can greatly improve the availability of frequency spectrum of digital TV multimedia broadcast single frequency network wireless transmitting system.In actual single frequency network communication environment, digital TV multimedia broadcast single frequency network performance in wireless communication systems is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Each multimedia broadcasting anti-noise wireless signal transmitter framing modulator approach in single frequency network is to realize the key technology of reliable digit television multimedia broadcast single frequency network wireless transmission.
Utilizing digital TV multimedia broadcast single frequency network wireless transmitting system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital television multimedia broadcast single frequency network wireless transmitting system satisfies social needs.
Just based on above background, the present invention is directed to practical communication environment and propose a kind of anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network, can meet high coded data rate and can control the needs of multi-service digital TV multimedia 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.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?on?Global?Digital?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?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
Summary of the invention
The present invention is directed to high coded data rate and can control multi-service digital TV multimedia broadcast single frequency network wireless issue, proposed a kind of anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network.
A kind of anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network that the present invention proposes, is characterized in that it comprises the following steps:
1) the network data management device of single frequency network 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;
2) 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 on each multimedia broadcasting anti-noise wireless signal transmitter branch road in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each multimedia broadcasting single-frequency network anti-noise wireless signal transmitter branch road is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network;
3) each multimedia broadcasting anti-noise wireless 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];
4) each multimedia broadcasting anti-noise wireless 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];
5) each multimedia broadcasting anti-noise wireless 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
* veryrepresent 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
* evenrepresent 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;
6) each multimedia broadcasting anti-noise wireless signal transmitter Insert service index series after training sequence in single frequency network forms time-domain 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 each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network;
7) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network inserts using Cyclic Prefix as protection interval and falls the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, the discrete coded data sample value of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio piece falls in formation, as frame, the length of Cyclic Prefix is C;
8) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete coded data sample value of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio piece be frame by time-domain training sequence discrete sample block, to form signal frame;
9) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network by baseband signal up-conversion to carrier wave.
According to above-mentioned anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network, it is characterized in that: each multimedia broadcasting anti-noise wireless 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 multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is made up 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
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, 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 multimedia broadcasting anti-noise wireless signal transmitter signal frame in single frequency network is 1/16 of FFT coded data block length K; The operational indicator sequence of each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network; The FFT coded data block of each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is made up 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 in the time that 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 multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, the signal frame of each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete coded data sample value of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio piece be frame and forming by time-domain training sequence discrete sample block, these have guaranteed that multimedia broadcasting single-frequency network anti-noise 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.Insert using Cyclic Prefix as protection interval 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 body, can reduce the interference effect between signal frame head and frame coded data.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 multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network, can make digital TV multimedia broadcast single frequency network wireless transmitting system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Framing modulator approach of the present invention has low peak-to-average power ratio, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide high coded data rate can control the plurality of advantages such as multi-service digital TV multimedia broadcast single frequency network wireless transmission.
Accompanying drawing explanation
Fig. 1 is the embodiment schematic diagram according to the transmitter of anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network of the present invention.
Fig. 2 is according to the embodiment schematic diagram of the transmitter signal framing modulation of anti-noise wireless signal framing modulation method of multimedia 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 of the transmitter of the anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) the network data management device of single frequency network 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;
2) 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 on each multimedia broadcasting anti-noise wireless signal transmitter branch road in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each multimedia broadcasting single-frequency network anti-noise wireless signal transmitter branch road is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network;
3) each multimedia broadcasting anti-noise wireless 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];
4) each multimedia broadcasting anti-noise wireless 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];
5) each multimedia broadcasting anti-noise wireless 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
* veryrepresent 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
* evenrepresent 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;
6) each multimedia broadcasting anti-noise wireless signal transmitter Insert service index series after training sequence in single frequency network forms time-domain 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 each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network;
7) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network inserts using Cyclic Prefix as protection interval and falls the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, the discrete coded data sample value of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio piece falls in formation, as frame, the length of Cyclic Prefix is C;
8) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete coded data sample value of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio piece be frame by time-domain training sequence discrete sample block, to form signal frame;
9) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network by baseband signal up-conversion to carrier wave.
According to the embodiment of the transmitter signal framing modulation of anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network of the present invention, as shown in Figure 2, be specifically implemented as follows:
The network data management device of single frequency network is coded in the input data bit LDPC that flows through on frequency domain, to form FFT coded data block, to adopt code check be 1, and space-frequency coding device is modulated to the FFT coded data block forming on frequency domain on each multimedia broadcasting anti-noise wireless signal transmitter branch road in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each multimedia broadcasting single-frequency network anti-noise wireless signal transmitter branch road is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network; Be transformed to sky frequency modulation time domain discrete coded data processed sample value piece through IFFT again, 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 by peak-to-average power ratio adjustment unit and the generate pattern information of institute's correspondence employing is sent to operational indicator sequence setting unit simultaneously.The encoding rate that each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network adopts LDPC coding to carry out chnnel coding to input data is in 1/4,1/2,5/8,3/4 and 7/8.
The FFT coded data block of each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
The training sequence of each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is made up 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
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, 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 multimedia broadcasting anti-noise wireless signal transmitter Insert service index series after training sequence in single frequency network forms time-domain training sequence discrete sample block in time domain.
The operational indicator sequence of each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network.
Each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network inserts using Cyclic Prefix as protection interval and falls the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, the discrete coded data sample value of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio piece falls in formation, as frame, the length of Cyclic Prefix is C; Each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete coded data sample value of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio piece be frame by time-domain training sequence discrete sample block, to form signal frame; The circulating prefix-length C of each multimedia broadcasting anti-noise wireless signal transmitter signal frame in single frequency network is 1/16 of FFT coded data block length K.
Each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
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 signal framing modulation method of multimedia broadcasting single frequency network, is characterized in that it comprises the following steps:
1) 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;
2) 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 on each multimedia broadcasting anti-noise wireless signal transmitter branch road in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each multimedia broadcasting single-frequency network anti-noise wireless signal transmitter branch road is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network;
3) each multimedia broadcasting anti-noise wireless 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];
4) each multimedia broadcasting anti-noise wireless 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];
5) each multimedia broadcasting anti-noise wireless 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
* veryrepresent 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
* evenrepresent 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;
6) each multimedia broadcasting anti-noise wireless signal transmitter Insert service index series after training sequence in single frequency network forms time-domain 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 each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network;
7) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network inserts using Cyclic Prefix as protection interval and falls the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, the discrete coded data sample value of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio piece falls in formation, as frame, the length of Cyclic Prefix is C;
8) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network is that frame head is inserted into that to fall the discrete coded data sample value of the empty frequency modulation time domain cyclic prefix processed of peak-to-average power ratio piece be frame by time-domain training sequence discrete sample block, to form signal frame;
9) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) each multimedia broadcasting anti-noise wireless signal transmitter in single frequency network by baseband signal up-conversion to carrier wave.
2. by the anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network of claim 1, it is characterized in that: described training sequence is made up 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
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, B has identical symbol lengths L with A.
3. by the anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network of claim 1, it is characterized in that: described C gets 1/16 of K; 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.
4. by the anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network of claim 1, it is characterized in that: described operational indicator sequence has pseudo-random characteristics, realized by one group of Phase shift m sequence.
5. by the anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network of claim 1, it is characterized in that: described FFT coded data block is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
6. by the anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network of claim 1, it is characterized in that: described G gets 1/8 of L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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