CN103763269A - Anti-noise mobile multimedia broadcast signal framing modulation method for single-frequency network - Google Patents
Anti-noise mobile multimedia broadcast signal framing modulation method for single-frequency network Download PDFInfo
- Publication number
- CN103763269A CN103763269A CN201410023039.5A CN201410023039A CN103763269A CN 103763269 A CN103763269 A CN 103763269A CN 201410023039 A CN201410023039 A CN 201410023039A CN 103763269 A CN103763269 A CN 103763269A
- Authority
- CN
- China
- Prior art keywords
- time domain
- coded data
- sample value
- frequency modulation
- data processed
- 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
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses an anti-noise mobile multimedia broadcast signal framing modulation method for a single-frequency network. The method is a spatial domain, time domain and frequency domain combined framing modulation scheme. According to the method, based on training sequence optimization design, signal generation mode selection and signal selection, original signals of OFDM signals can be easily obtained on a receiver side through processing and recovery. The method has the advantages of low peak-to-average power ratio, short synchronization time, anti-channel-fading performance, multi-service controllability and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of noise-resistance framing modulation method for mobile multi-media broadcast signals of single frequency network.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital television mobile multimedia broadcast transmission system, as the important component part of digital television mobile multimedia broadcasting, the development of its correlation technique, closely bound up with people's quality of life, and be therefore subject to people's extensive concern especially.Digital television mobile multimedia broadcasting correlation technique and related industry thereof are that in Communications And Computer field, development is very fast, the industry of good market prospect.In digital television mobile multimedia broadcasting correlation technique, the emphasis that various countries pay close attention to is at present that the digital television mobile multimedia broadcasting how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Single-frequency network anti-noise mobile multimedia broadcast signal transmitter framing modulation technique is the key technology of digital television mobile multi-media 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, digital television mobile multimedia broadcasting.
The peak-to-average power ratio that ofdm signal is higher (PAPR) 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.
The networking model of employing single frequency network can improve the availability of frequency spectrum of digital television mobile multimedia broadcast transmission system greatly.In practical communication environment, digital television mobile multimedia broadcasting communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Single-frequency network anti-noise mobile multimedia broadcast signal transmitter framing modulator approach is to realize the key technology of reliable digit TV Mobile Multimedia Broadcasting.
Utilizing digital television mobile multimedia broadcast transmission system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital TV Mobile Multimedia Broadcasting transmission system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of noise-resistance framing modulation method for mobile multi-media broadcast signals of single frequency network just, can meet the needs that High Data Rate can be controlled the transmission of multi-service digital television mobile multimedia broadcasting.
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 Data Rate and can control multi-service digital television mobile multimedia broadcasting problem, proposed a kind of noise-resistance framing modulation method for mobile multi-media broadcast signals of single frequency network.
A kind of noise-resistance framing modulation method for mobile multi-media broadcast signals of 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 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 a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, 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) the network data management device of single frequency network adopts the space-frequency coding device that code check is 1 that the FFT coded data block forming on frequency domain is modulated in each antinoise mobile multimedia broadcast signal transmitter branches in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each antinoise mobile multimedia broadcast 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 antinoise mobile multimedia broadcast signal transmitter in single frequency network adopts IFFT that empty frequency modulation FFT coded data block processed 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 antinoise mobile multimedia broadcast signal transmitter in single frequency network is by empty frequency modulation time domain discrete coded data processed sample value piece demultiplexing and according to the sequencing odd even of each the empty frequency modulation time domain discrete coded data processed sample value successively separated strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value that generates
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 antinoise mobile multimedia broadcast signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value
very, the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete coded data processed sample value piece D again
new, new empty frequency modulation time domain discrete coded data processed sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
compare the synthetic empty frequency modulation time domain discrete coded data processed sample value piece D of 18 kinds of generate patterns
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 sky 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 sky 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 antinoise mobile multimedia broadcast signal transmitter Insert service index series after training sequence in single frequency network forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise mobile multimedia broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece of training sequence discrete sample block;
7) each antinoise mobile multimedia broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete coded data processed sample value piece, as frame;
8) each antinoise mobile multimedia broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) each antinoise mobile multimedia broadcast signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) each antinoise mobile multimedia broadcast signal transmitter in single frequency network by baseband signal up-conversion to carrier wave.
According to each anti-noise mobile multimedia broadcast signal framing modulation method in above-mentioned single frequency network, it is characterized in that: each antinoise mobile multimedia broadcast signal transmitter in single frequency network the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece falls by empty frequency modulation time domain discrete coded data processed sample value piece demultiplexing and carry out signal power adjustment and corresponding signal according to the strange sub-block of empty frequency modulation time domain discrete coded data processed sample value of the sequencing odd even of each empty frequency modulation time domain discrete coded data processed sample value successively separated generation and empty frequency modulation time domain discrete coded data processed sample value idol sub-block and process and pass through 18 kinds of generate patterns of particular design and again synthesize, the training sequence of each antinoise mobile multimedia broadcast signal transmitter in single frequency network is comprised of the first training sequence and the second training sequence, the first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G 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 that the new sequence that produces and length thereof are G and form, 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 antinoise mobile multimedia broadcast signal transmitter signal frame in single frequency network is 1/16 of FFT coded data block length K, the operational indicator sequence of each antinoise mobile multimedia broadcast signal transmitter in single frequency network has pseudo-random characteristics, by one group of Phase shift m sequence, is realized, each different operational indicator sequence of each antinoise mobile multimedia broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise mobile multimedia broadcast signal transmitter, the FFT coded data block of each antinoise mobile multimedia broadcast signal transmitter in single frequency network is comprised of subcarrier, and the frequency interval of subcarrier is got a kind of 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 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 successively separation, 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 of the ofdm signal when number of sub carrier wave is larger (or imaginary part) 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 antinoise mobile multimedia broadcast signal transmitter in single frequency network is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, it is by falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece that the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece falls in the time domain embedding training sequence of each antinoise mobile multimedia broadcast signal transmitter in single frequency network, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that single-frequency network anti-noise mobile multimedia broadcast signal receiver can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic are reliably followed the tracks of.Using Cyclic Prefix as protection interval, insert time domain embedding training sequence and fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece to form signal frame, can reduce the interference effect between adjacent signals frame.Adopt LDPC coding to carry out chnnel coding to input data the error-correcting performance that approaches shannon limit is provided.Code element modulation and constellation rotation provide the diversity of mobile multimedia broadcast signal.Each different operational indicator sequence of each antinoise mobile multimedia broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise mobile multimedia broadcast signal transmitter, can, so that digital television mobile multimedia broadcast transmission system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.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 Data Rate can control the plurality of advantages such as multi-service digital television mobile multimedia broadcasting transmission.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of the single frequency network transmitter of noise-resistance framing modulation method for mobile multi-media broadcast signals of single frequency network of the present invention.
Fig. 2 is according to the embodiment schematic diagram of the single frequency network transmitter signal framing modulation of noise-resistance framing modulation method for mobile multi-media broadcast signals of single frequency network of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The embodiment of the single frequency network transmitter of the noise-resistance framing modulation method for mobile multi-media broadcast signals of 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 a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, 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) the network data management device of single frequency network adopts the space-frequency coding device that code check is 1 that the FFT coded data block forming on frequency domain is modulated in each antinoise mobile multimedia broadcast signal transmitter branches in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each antinoise mobile multimedia broadcast 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 antinoise mobile multimedia broadcast signal transmitter in single frequency network adopts IFFT that empty frequency modulation FFT coded data block processed 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 antinoise mobile multimedia broadcast signal transmitter in single frequency network is by empty frequency modulation time domain discrete coded data processed sample value piece demultiplexing and according to the sequencing odd even of each the empty frequency modulation time domain discrete coded data processed sample value successively separated strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value that generates
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 antinoise mobile multimedia broadcast signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value
very, the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete coded data processed sample value piece D again
new, new empty frequency modulation time domain discrete coded data processed sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
compare the synthetic empty frequency modulation time domain discrete coded data processed sample value piece D of 18 kinds of generate patterns
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 sky 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 sky 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 antinoise mobile multimedia broadcast signal transmitter Insert service index series after training sequence in single frequency network forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise mobile multimedia broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece of training sequence discrete sample block;
7) each antinoise mobile multimedia broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete coded data processed sample value piece, as frame;
8) each antinoise mobile multimedia broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) each antinoise mobile multimedia broadcast signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) each antinoise mobile multimedia broadcast signal transmitter in single frequency network by baseband signal up-conversion to carrier wave.
Embodiment according to the single frequency network transmitter signal framing modulation of noise-resistance framing modulation method for mobile multi-media broadcast signals of single frequency network of the present invention, as shown in Figure 2, is specifically implemented as follows:
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; 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 antinoise mobile multimedia broadcast signal transmitter branches in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each mobile multimedia broadcast signal transmitter branches is all processed at one time to empty frequency modulation FFT coded data block processed with all transmitters in assurance network; Through IFFT, be transformed to sky frequency modulation time domain discrete coded data processed sample value piece again, by peak-to-average power ratio adjustment unit, generate and choose the empty frequency modulation of the peak-to-average power ratio time domain discrete coded data processed sample value piece that falls wherein with minimum peak-to-average power ratio and the generate pattern information of institute's correspondence employing is sent to operational indicator sequence setting unit simultaneously.The encoding rate that each antinoise mobile multimedia broadcast 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 a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, 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.
Empty frequency modulation FFT coded data block processed is comprised of subcarrier.The length of empty frequency modulation FFT coded data block processed is K, and the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz.
The training sequence of each antinoise mobile multimedia broadcast signal transmitter in single frequency network is comprised of the first training sequence and the second training sequence; The first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G 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 that the new sequence that produces and length thereof are G and form; 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 antinoise mobile multimedia broadcast signal transmitter Insert service index series after training sequence in single frequency network forms time domain and embeds training sequence discrete sample block in time domain.
The operational indicator sequence of each antinoise mobile multimedia broadcast signal transmitter in single frequency network has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of each antinoise mobile multimedia broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise mobile multimedia broadcast signal transmitter.
The time domain of each antinoise mobile multimedia broadcast signal transmitter in single frequency network embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece of training sequence discrete sample block; Each antinoise mobile multimedia broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete coded data processed sample value piece, as frame; Each antinoise mobile multimedia broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C; The circulating prefix-length C of each antinoise mobile multimedia broadcast signal transmitter signal frame in single frequency network is 1/16 of FFT coded data block length K.
Each antinoise mobile multimedia broadcast 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 noise-resistance framing modulation method for mobile multi-media broadcast signals of 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 a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, 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) the network data management device of single frequency network adopts the space-frequency coding device that code check is 1 that the FFT coded data block forming on frequency domain is modulated in each antinoise mobile multimedia broadcast signal transmitter branches in single frequency network and forms empty frequency modulation FFT coded data block processed, and the time synchronized of adjusting each antinoise mobile multimedia broadcast 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 antinoise mobile multimedia broadcast signal transmitter in single frequency network adopts IFFT that empty frequency modulation FFT coded data block processed 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 antinoise mobile multimedia broadcast signal transmitter in single frequency network is by empty frequency modulation time domain discrete coded data processed sample value piece demultiplexing and according to the sequencing odd even of each the empty frequency modulation time domain discrete coded data processed sample value successively separated strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value that generates
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 antinoise mobile multimedia broadcast signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete coded data processed sample value
very, the even sub-block D of empty frequency modulation time domain discrete coded data processed sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete coded data processed sample value piece D again
new, new empty frequency modulation time domain discrete coded data processed sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
compare the synthetic empty frequency modulation time domain discrete coded data processed sample value piece D of 18 kinds of generate patterns
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 sky 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 sky 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 antinoise mobile multimedia broadcast signal transmitter Insert service index series after training sequence in single frequency network forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing single-frequency network anti-noise mobile multimedia broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece of training sequence discrete sample block;
7) each antinoise mobile multimedia broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete coded data processed sample value piece, as frame;
8) each antinoise mobile multimedia broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete coded data processed sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) each antinoise mobile multimedia broadcast signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) each antinoise mobile multimedia broadcast signal transmitter in single frequency network by baseband signal up-conversion to carrier wave.
2. by the noise-resistance framing modulation method for mobile multi-media broadcast signals of 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 first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G 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 that the new sequence that produces and length thereof are G and form; 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 noise-resistance framing modulation method for mobile multi-media broadcast signals of 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 noise-resistance framing modulation method for mobile multi-media broadcast signals of 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 noise-resistance framing modulation method for mobile multi-media broadcast signals of single frequency network of claim 1, it is characterized in that: described FFT coded data block is comprised of subcarrier, the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz.
6. by the noise-resistance framing modulation method for mobile multi-media broadcast signals of 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 |
|---|---|---|---|
| CN201410023039.5A CN103763269A (en) | 2014-01-13 | 2014-01-13 | Anti-noise mobile multimedia broadcast signal framing modulation method for single-frequency network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410023039.5A CN103763269A (en) | 2014-01-13 | 2014-01-13 | Anti-noise mobile multimedia broadcast signal framing modulation method for single-frequency network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103763269A true CN103763269A (en) | 2014-04-30 |
Family
ID=50530431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410023039.5A Pending CN103763269A (en) | 2014-01-13 | 2014-01-13 | Anti-noise mobile multimedia broadcast signal framing modulation method for single-frequency network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103763269A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1885846A (en) * | 2006-05-22 | 2006-12-27 | 北京北方烽火科技有限公司 | Orthogonal frequency-division multiplexing system and selective mapping transmitting and receiving method |
| CN1968237A (en) * | 2005-11-18 | 2007-05-23 | 华为技术有限公司 | Apparatus and method for reducing mean peak power rate in orthogonal frequency-division multiplexing system |
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| CN102263744A (en) * | 2011-08-22 | 2011-11-30 | 宁波大学 | Noise-resistance framing modulation method for mobile multi-media broadcast signals of 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 CN201410023039.5A patent/CN103763269A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1968237A (en) * | 2005-11-18 | 2007-05-23 | 华为技术有限公司 | Apparatus and method for reducing mean peak power rate in orthogonal frequency-division multiplexing system |
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| CN1885846A (en) * | 2006-05-22 | 2006-12-27 | 北京北方烽火科技有限公司 | Orthogonal frequency-division multiplexing system and selective mapping transmitting and receiving method |
| CN102263744A (en) * | 2011-08-22 | 2011-11-30 | 宁波大学 | Noise-resistance framing modulation method for mobile multi-media broadcast signals of 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) |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103763082A (en) | Robust mobile signal framing modulation method for multimedia broadcast single frequency network | |
| 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 | |
| CN103763290A (en) | Method for framing and modulating anti-interference wireless multimedia broadcast signals in 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 | |
| CN103763261A (en) | Anti-interference wireless signal transmission method for digital broadcast single frequency network | |
| CN103780533A (en) | Digital broadcasting single frequency network anti-interference mobile signal transmission method | |
| CN103763269A (en) | Anti-noise mobile multimedia broadcast signal framing modulation method for single-frequency network | |
| CN103763271A (en) | Anti-fading 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 | |
| CN103763268A (en) | Mobile multimedia broadcast signal framing modulation method for single frequency network | |
| CN103795673A (en) | Single-frequency-network robust wireless multimedia broadcast signal framing and modulating method | |
| CN103763236A (en) | Anti-noise mobile signal framing modulation method for multimedia broadcast single frequency network | |
| CN103795671A (en) | Single-frequency-network robust mobile multimedia broadcast signal framing and modulating method | |
| CN103780546A (en) | Single-frequency network anti-fading wireless multimedia broadcasting signal framing modulation method | |
| CN103763289A (en) | Single frequency network anti-noise wireless multimedia broadcasting signal framing modulation method | |
| CN103780564A (en) | Single-frequency network anti-noise mobile digital broadcasting signal transmission method | |
| CN103763237A (en) | Framing modulation method for mobile signals of multimedia broadcast single frequency network | |
| CN103780550A (en) | Anti-fading wireless signal framing modulation method for single frequency network in multimedia broadcasting | |
| CN103763238A (en) | Anti-interference mobile signal framing modulation method for multimedia broadcast single frequency network | |
| CN103780549A (en) | Robust 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 | |
| CN103780567A (en) | Single-frequency network anti-fading mobile digital broadcasting signal transmission method | |
| CN103780563A (en) | Single-frequency network mobile digital broadcasting signal transmission 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 |
Application publication date: 20140430 |
|
| RJ01 | Rejection of invention patent application after publication |