CN103763236A - Anti-noise mobile signal framing modulation method for multimedia broadcast single frequency network - Google Patents
Anti-noise mobile signal framing modulation method for multimedia broadcast single frequency network Download PDFInfo
- Publication number
- CN103763236A CN103763236A CN201410020680.3A CN201410020680A CN103763236A CN 103763236 A CN103763236 A CN 103763236A CN 201410020680 A CN201410020680 A CN 201410020680A CN 103763236 A CN103763236 A CN 103763236A
- Authority
- CN
- China
- Prior art keywords
- coded data
- time domain
- sample value
- frequency modulation
- generate pattern
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses an anti-noise mobile signal framing modulation method for a multimedia broadcast single frequency network, and relates to a mixed framing modulation scheme of the space domain, the time domain and the frequency domain. According to the training sequence optimization design, the signal generating scheme and the signal selecting method of the anti-noise mobile signal framing modulation method for the multimedia broadcast single frequency network, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals. The anti-noise mobile signal framing modulation method for the multimedia broadcast single frequency network has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of method for modulating framing of anti-noise mobile signals of multimedia broadcast 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 movable signal transmitter framing modulation technique is the key technology of Digital Television wireless multimedia 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 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 (that is, 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 antinoise movable 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 method for modulating framing of anti-noise mobile signals of multimedia broadcast 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?IEEESpecial?Issue?on?Global?Digital?Television：TechnologyandEmergingServices，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?ofthe?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 method for modulating framing of anti-noise mobile signals of multimedia broadcast single-frequency network.
A kind of method for modulating framing of anti-noise mobile signals of multimedia broadcast single-frequency network that the present invention proposes, its feature
Be that it comprises the following steps:
1) the network data management device of single frequency network is flowed through input data bit after LDPC coding, code element modulation are rotated with code element and on frequency domain, is formed FFT coded data block, LDPC represents low-density checksum, 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 in each multimedia broadcasting antinoise movable signal transmitter branches 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 movable signal transmitter branches is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network;
3) each multimedia broadcasting antinoise movable 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 antinoise movable 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 antinoise movable 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
generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is
generate pattern
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is
generate pattern
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;
6) each multimedia broadcasting antinoise movable 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 antinoise movable signal transmitter in single frequency network;
7) each multimedia broadcasting antinoise movable 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 antinoise movable 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 antinoise movable 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 antinoise movable signal transmitter in single frequency network by baseband signal up-conversion to carrier wave.
According to above-mentioned method for modulating framing of anti-noise mobile signals of multimedia broadcast single-frequency network, it is characterized in that: each multimedia broadcasting antinoise movable 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 antinoise movable 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 multimedia broadcasting antinoise movable 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 antinoise movable 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 multimedia broadcasting antinoise movable signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting antinoise movable signal transmitter in single frequency network; The FFT coded data block of each multimedia broadcasting antinoise movable 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; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
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 multimedia broadcasting antinoise movable 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 antinoise movable 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 movable 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 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.Code element modulation rotates with code element the diversity that mobile multimedia broadcast signal is provided.Each different operational indicator sequence of each multimedia broadcasting antinoise movable signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting antinoise movable 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 method for modulating framing of anti-noise mobile signals of multimedia broadcast single-frequency network of the present invention.
Fig. 2 is according to the embodiment schematic diagram of the transmitter signal framing modulation of method for modulating framing of anti-noise mobile signals of multimedia broadcast 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 method for modulating framing of anti-noise mobile signals of multimedia broadcast 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 flowed through input data bit after LDPC coding, code element modulation are rotated with code element and on frequency domain, is formed FFT coded data block, LDPC represents low-density checksum, the length of FFT coded data block is K, and the numerical value of K is got even number; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree;
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 in each multimedia broadcasting antinoise movable signal transmitter branches 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 movable signal transmitter branches is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network;
3) each multimedia broadcasting antinoise movable 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 antinoise movable 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 antinoise movable 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
generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
become the mode and 6 be
generate pattern 7 is
generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is
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;
6) each multimedia broadcasting antinoise movable 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 antinoise movable signal transmitter in single frequency network;
7) each multimedia broadcasting antinoise movable 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 antinoise movable 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 antinoise movable 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 antinoise movable 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 method for modulating framing of anti-noise mobile signals of multimedia broadcast 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 by flow through LDPC coding of input data bit, code element modulation forms FFT coded data block after rotating with code element on frequency domain, adopt the space-frequency coding device that code check is 1 that the FFT coded data block forming on frequency domain is modulated in each multimedia broadcasting antinoise movable signal transmitter branches 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 movable signal transmitter branches is all processed empty frequency modulation FFT coded data block processed at one time to guarantee all transmitters in 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.The encoding rate that each multimedia broadcasting antinoise movable 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; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
The FFT coded data block of each multimedia broadcasting antinoise movable 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 training sequence of each multimedia broadcasting antinoise movable 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 multimedia broadcasting antinoise movable 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 antinoise movable 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 multimedia broadcasting antinoise movable signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each multimedia broadcasting antinoise movable signal transmitter in single frequency network.
Each multimedia broadcasting antinoise movable 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 antinoise movable 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 antinoise movable signal transmitter signal frame in single frequency network is 1/16 of FFT coded data block length K.
Each multimedia broadcasting antinoise movable 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. a method for modulating framing of anti-noise mobile signals of multimedia broadcast single-frequency network, is characterized in that it comprises the following steps:
1) the network data management device of single frequency network is flowed through input data bit after LDPC coding, code element modulation are rotated with code element and on frequency domain, is formed FFT coded data block, LDPC represents low-density checksum, the length of FFT coded data block is K, and the numerical value of K is got even number; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree;
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 in each multimedia broadcasting antinoise movable signal transmitter branches 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 movable signal transmitter branches is all processed empty frequency modulation FFT coded data block processed at one time with all transmitters in assurance network;
3) each multimedia broadcasting antinoise movable 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 antinoise movable 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 antinoise movable 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
generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is
generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is
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;
6) each multimedia broadcasting antinoise movable 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 antinoise movable signal transmitter in single frequency network;
7) each multimedia broadcasting antinoise movable 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 antinoise movable 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 antinoise movable 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 antinoise movable signal transmitter in single frequency network by baseband signal up-conversion to carrier wave.
2. by the method for modulating framing of anti-noise mobile signals of multimedia broadcast 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 method for modulating framing of anti-noise mobile signals of multimedia broadcast 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 method for modulating framing of anti-noise mobile signals of multimedia broadcast 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 method for modulating framing of anti-noise mobile signals of multimedia broadcast 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.
6. by the method for modulating framing of anti-noise mobile signals of multimedia broadcast 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 |
|---|---|---|---|
| CN201410020680.3A CN103763236A (en) | 2014-01-13 | 2014-01-13 | Anti-noise mobile signal framing modulation method for multimedia broadcast single frequency network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410020680.3A CN103763236A (en) | 2014-01-13 | 2014-01-13 | Anti-noise mobile signal framing modulation method for multimedia broadcast single frequency network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103763236A true CN103763236A (en) | 2014-04-30 |
Family
ID=50530398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410020680.3A Pending CN103763236A (en) | 2014-01-13 | 2014-01-13 | Anti-noise mobile signal framing modulation method for multimedia broadcast single frequency network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103763236A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| CN102263728A (en) * | 2011-08-22 | 2011-11-30 | 宁波大学 | Method for modulating framing of anti-noise mobile signals of multimedia broadcast single-frequency network |
| CN102263727A (en) * | 2011-08-22 | 2011-11-30 | 宁波大学 | Interference-resistance framing modulation method for mobile signals of multimedia broadcasting single frequency network |
| CN102882670A (en) * | 2012-09-13 | 2013-01-16 | 电子科技大学 | Synchronous processing method based on CMMB signals |
| CN103326985A (en) * | 2013-07-15 | 2013-09-25 | 浙江师范大学 | Method for reducing peak-to-mean ratio in OFDM (Orthogonal Frequency Division Multiplexing) |
-
2014
- 2014-01-13 CN CN201410020680.3A patent/CN103763236A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| CN102263728A (en) * | 2011-08-22 | 2011-11-30 | 宁波大学 | Method for modulating framing of anti-noise mobile signals of multimedia broadcast single-frequency network |
| CN102263727A (en) * | 2011-08-22 | 2011-11-30 | 宁波大学 | Interference-resistance framing modulation method for mobile signals of multimedia broadcasting single frequency network |
| CN102882670A (en) * | 2012-09-13 | 2013-01-16 | 电子科技大学 | Synchronous processing method based on CMMB signals |
| CN103326985A (en) * | 2013-07-15 | 2013-09-25 | 浙江师范大学 | Method for reducing peak-to-mean ratio in OFDM (Orthogonal Frequency Division Multiplexing) |
Non-Patent Citations (2)
| Title |
|---|
| DAOUND O,ALANI O: "Reducing the PAPR by utilisation of the LDPC code", 《IET COMMUNICATIONS》 * |
| YANG X,LEE M H: "Low Complexity MIMO-LDPC CDMA Systems over Multipath Channels", 《IEICE TRANSACTIONS ON COMMUNICATIONS》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103763082A (en) | Robust mobile signal framing modulation method for multimedia broadcast single frequency network | |
| CN103763249A (en) | Anti-interference wireless signal transmission method for digital broadcast | |
| CN103763256A (en) | Framing modulation method for multimedia movable broadcast signals | |
| CN103763061A (en) | Anti-fading mobile signal framing modulation method for multimedia broadcast single frequency network | |
| CN103780533A (en) | Digital broadcasting single frequency network anti-interference mobile signal transmission method | |
| CN103763290A (en) | Method for framing and modulating anti-interference wireless multimedia broadcast signals in single frequency network | |
| CN103763261A (en) | Anti-interference wireless signal transmission method for digital broadcast single frequency network | |
| CN103763287A (en) | Anti-fading wireless digital broadcast signal transmission method for single frequency network | |
| CN103763262A (en) | Robust wireless signal transmission method for digital broadcast single frequency network | |
| CN103763264A (en) | Anti-noise wireless signal transmission method for digital broadcast single frequency network | |
| CN103763236A (en) | Anti-noise mobile signal framing modulation method for multimedia broadcast single frequency network | |
| CN103763238A (en) | Anti-interference mobile signal framing modulation method for multimedia broadcast single frequency network | |
| CN103780550A (en) | Anti-fading wireless signal framing modulation method for single frequency network in multimedia broadcasting | |
| CN103763241A (en) | Anti-noise mobile signal transmission method for digital broadcast single frequency network | |
| CN103780549A (en) | Robust wireless signal framing modulation method for single frequency network in multimedia broadcasting | |
| CN103763237A (en) | Framing modulation method for mobile signals of multimedia broadcast single frequency network | |
| CN103763269A (en) | Anti-noise mobile multimedia broadcast signal framing modulation method for single-frequency network | |
| CN103780548A (en) | Anti-interference wireless signal framing modulation method for single frequency network in multimedia broadcasting | |
| CN103780547A (en) | Anti-noise wireless signal framing modulation method for single frequency network in multimedia broadcasting | |
| CN103763267A (en) | Anti-noise mobile signal transmission method for digital broadcast | |
| CN103763243A (en) | Anti-fading mobile signal transmission method for digital broadcast single frequency network | |
| CN103795673A (en) | Single-frequency-network robust wireless multimedia broadcast signal framing and modulating method | |
| CN103763268A (en) | Mobile multimedia broadcast signal framing modulation method for single frequency network | |
| CN103763270A (en) | Anti-interference mobile multimedia broadcast signal framing modulation method for single-frequency network | |
| CN103780546A (en) | Single-frequency network anti-fading wireless multimedia broadcasting signal framing modulation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140430 |