CN102263742B - Robust framing modulation method for mobile multi-media broadcast signals of single frequency network - Google Patents

Robust framing modulation method for mobile multi-media broadcast signals of single frequency network Download PDF

Info

Publication number
CN102263742B
CN102263742B CN2011102483351A CN201110248335A CN102263742B CN 102263742 B CN102263742 B CN 102263742B CN 2011102483351 A CN2011102483351 A CN 2011102483351A CN 201110248335 A CN201110248335 A CN 201110248335A CN 102263742 B CN102263742 B CN 102263742B
Authority
CN
China
Prior art keywords
time domain
cascade interweaved
interweaved coding
sequence
modulation data
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.)
Expired - Fee Related
Application number
CN2011102483351A
Other languages
Chinese (zh)
Other versions
CN102263742A (en
Inventor
郑紫微
徐铁峰
聂秋华
何加铭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Zhitoujia Intellectual Property Operation Co ltd
Xu Lei
Original Assignee
Ningbo University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ningbo University filed Critical Ningbo University
Priority to CN2011102483351A priority Critical patent/CN102263742B/en
Publication of CN102263742A publication Critical patent/CN102263742A/en
Application granted granted Critical
Publication of CN102263742B publication Critical patent/CN102263742B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

The invention discloses a robust framing modulation method for mobile multi-media broadcast signals of a single frequency network, which is a time domain, frequency domain and space domain hybrid framing modulation scheme. The method has the advantages of low peak-to-average power ratio, short synchronous time, robustness, controllability in multiple services and the like.

Description

A kind of robust framing modulation method for mobile multi-media broadcast signals of single frequency network
Technical field
The invention belongs to moving communicating field, relate more specifically to a kind of robust framing modulation method for mobile multi-media broadcast signals of single frequency network.
Background technology
Because the OFDM Multicarrier Transmission Technology has simple in structure, the availability of frequency spectrum is high, the plurality of advantages such as becomes in the time of can resisting frequency selectivity and channel and extremely everybody concern obtain deep research and the extensive use in the numerous areas such as Xdsl, wide-band mobile communication, broadband mobile local area network (LAN), 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, therefore, the solution that must consider how to reduce the probability of occurrence of large peak power signal in ofdm signal and reduce the nonlinear distortion impact.Cascade different coding form can take full advantage of the different coding technological merit; Insert bit interleaver between coding and code element modulation, can so that the coding and modulated process is relatively independent and expand diversity order to different binary bits number from different multi-system symbolic numbers, thereby the bit error performance that makes diversity order be improved significantly and had under multidiameter fading channel.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 actual single frequency network 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 robust mobile multimedia broadcast signal transmitter framing modulator approach is to realize the key technology of reliable digit TV monochromatic network robust Mobile Multimedia Broadcasting.Utilizing digital television single-frequency network robust Mobile Multimedia Broadcasting transmission system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital TV Mobile Multimedia Broadcasting transmission system satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of robust framing modulation method for mobile multi-media broadcast signals of single frequency network, can meet the needs that High Data Rate can be controlled the transmission of multi-service digital television single-frequency network robust Mobile Multimedia Broadcasting.
Wish is done more deep understanding to the patent background can be with reference to following documents and materials:
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimedia?communications”.Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digital?television?development，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.8-21，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stationary?portable?and?mobile?use，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
S.Benedetto，D.Divsalar，G.Montorsi，and?F.Pollara，“Serial?concatenation?of?interleaved?codes：performance?analysis，design，and?iterative?decoding，”IEEE?Trans.Inform.Theory，vol.44，no.3，pp.909-925，May?1998.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service digital television single-frequency network robust Mobile Multimedia Broadcasting problem, proposed a kind of robust framing modulation method for mobile multi-media broadcast signals of single frequency network.
A kind of robust 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 will be inputted data bit Bose-Chaudhuri-Hocquenghem Code (the Bose Chaudhuri Hocquenghem that flows through, BCH), Bit Interleave, LDPC (the Low Density Parity Check that encodes, LDPC), the code element modulation forms the cascade interweaved coding modulation data piece of FFT with code element rotation, symbol interleave on frequency domain, FFT means the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
2) the network data management device of single frequency network adopts the cascade interweaved coding modulation data piece of FFT that space-frequency coding device that code check is 1 will form on frequency domain to be modulated on each robust mobile multimedia broadcast signal transmitter branches in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each robust mobile multimedia broadcast signal transmitter branches is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in the assurance network;
3) each robust mobile multimedia broadcast signal transmitter in single frequency network adopts IFFT that the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece D total, IFFT means the fast discrete Fourier inverse transformation;
4) each robust mobile multimedia broadcast signal transmitter in single frequency network is divided equally into two by the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece in order, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 1with the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 2, D total=[D 1, D 2];
5) each robust mobile multimedia broadcast signal transmitter in single frequency network passes through the peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 1, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 2carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D again new, the new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D newadopt following generate pattern to obtain, generate pattern 1 is D new=[D 1, D 2], generate pattern 2 is D new = [ D 1 , 1 / 2 ( D 1 + D 2 ) ] , Generate pattern 3 is D new = [ D 1 , 1 / 2 ( D 1 - D 2 ) ] , Generate pattern 4 is D new = [ 1 / 2 ( D 1 + D 2 ) , D 2 ] , Generate pattern 5 is D new = [ 1 / 2 ( D 1 - D 2 ) , D 2 ] , Generate pattern 6 is D new = [ 1 / 2 ( D 1 + D 2 ) , 1 / 2 ( D 1 - D 2 ) ] , Generate pattern 7 is D new=[D * 1, D 2], generate pattern 8 is D new = [ D * 1 , 1 / 2 ( D * 1 + D 2 ) ] , Generate pattern 9 is D new = [ D * 1 , 1 / 2 ( D * 1 - D 2 ) ] , Generate pattern 10 is D new = [ 1 / 2 ( D * 1 + D 2 ) , D 2 ] , Generate pattern 11 is D new = [ 1 / 2 ( D * 1 - D 2 ) , D 2 ] , Generate pattern 12 is D new = [ 1 / 2 ( D * 1 + D 2 ) , 1 / 2 ( D * 1 - D 2 ) ] , Compare the synthetic cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed piece D of 12 kinds of generate patterns new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls
Figure BSA000005635831000211
and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece will fall
Figure BSA000005635831000212
the corresponding generate pattern information adopted send to operational indicator sequence setting unit, wherein, D * 1expression is to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 1the cascade interweaved coding modulation data sample value of each sky frequency modulation time domain discrete processed carry out the conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains;
6) the real part sequence of each robust mobile multimedia broadcast signal transmitter using training sequence as sequence of plural training in single frequency network, using operational indicator sequence setting unit, set operational indicator sequence is as the imaginary part sequence of sequence of plural training, form the discrete sample block of sequence of plural training on time domain, training sequence, the operational indicator sequence, the length of the discrete sample block of sequence of plural training is all X, the operational indicator sequence is comprising and unique each system parameters and business model information of expressing each robust mobile multimedia broadcast signal transmitter in single frequency network,
The discrete sample block of the sequence of plural training that 7) each robust mobile multimedia broadcast signal transmitter in single frequency network will form on time domain repeats continuously to form time domain for 4 times and embeds training sequence discrete sample block on time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, i.e. K=4 * X of training sequence discrete sample block;
8) each robust mobile multimedia broadcast signal transmitter in single frequency network will fall the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece, as frame;
9) each robust mobile multimedia broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece be frame using Cyclic Prefix as the protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each robust 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;
11) each robust mobile multimedia broadcast signal transmitter in single frequency network by the baseband signal up-conversion to carrier wave.
Robust framing modulation method for mobile multi-media broadcast signals of single frequency network according to above-mentioned is characterized in that: each robust mobile multimedia broadcast signal transmitter in single frequency network fall that the signal that the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece undertakies by specific 12 kinds of generate patterns by the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block adds, subtracts, conjugate operation processing and again synthesizing; There is periodic time domain in the signal frame of each robust mobile multimedia broadcast signal transmitter in single frequency network and embed training sequence discrete sample block; The length X of the training sequence of each robust mobile multimedia broadcast signal transmitter in single frequency network is in 512,1024,2048, the length K of the corresponding cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is respectively 2048,4096,8192, the frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively 1/4,1/8,1/16 of the cascade interweaved coding modulation data block length of sky frequency modulation FFT processed K size; The training sequence of each robust mobile multimedia broadcast signal transmitter in single frequency network, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of each robust mobile multimedia broadcast signal transmitter in single frequency network have orthogonality each other; Each different operational indicator sequence of each robust mobile multimedia broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each robust mobile multimedia broadcast signal transmitter in single frequency network; The code check of space-frequency coding device is 1; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts the random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM; The 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; Symbol constellations figure mapping mode adopts the Gray code mapping; Symbol interleave adopts the random interleaving mode.
Characteristics of the present invention:
The present invention is the framing modulation scheme that mix in a kind of time-domain and frequency-domain spatial domain.Of the present invention fall the generate pattern of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece and there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece choosing method falls, but the very high large peak power signal probability of the maximum peak power that not only can take full advantage of ofdm signal is very low, the real part of the ofdm signal when number of sub carrier wave is larger (or imaginary part) is the characteristic of multiple Gaussian random process and whose amplitude obeys Rayleigh distribution, the amount of information of the required extra transmission of generate pattern adopted 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.There is periodic time domain in the signal frame of each robust mobile multimedia broadcast signal transmitter in single frequency network and embed training sequence discrete sample block, the training sequence of each robust mobile multimedia broadcast signal transmitter in single frequency network, the operational indicator sequence has pseudo-random characteristics, the training sequence of each robust mobile multimedia broadcast signal transmitter in single frequency network, the operational indicator sequence has orthogonality each other, it is by falling the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece that the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls in the time domain embedding training sequence of each robust 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 each mobile multimedia broadcast signal receiver in the single frequency network can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic are reliably followed the tracks of.Insert time domain embedding training sequence using Cyclic Prefix as the protection interval and fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece to form signal frame, can reduce the interference effect between the adjacent signals frame.The input data are carried out to cascade interweaved coded modulation improved diversity order, the bit error performance that makes communication system have under multidiameter fading channel.The code element modulation rotates with code element the diversity that mobile multimedia broadcast signal is provided.Each different operational indicator sequence of each robust mobile multimedia broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each robust mobile multimedia broadcast signal transmitter in single frequency network, can, so that digital television single-frequency network robust Mobile Multimedia Broadcasting transmission system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Framing modulator approach of the present invention has the equal power ratio of ebb, 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 single-frequency network robust Mobile Multimedia Broadcasting transmission.
The accompanying drawing explanation
Fig. 1 is the embodiment schematic diagram according to the single frequency network transmitter of robust framing modulation method for mobile multi-media broadcast signals of single frequency network of the present invention.
Fig. 2 is the embodiment schematic diagram according to the single frequency network transmitter signal framing modulation of robust 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 robust framing modulation method for mobile multi-media broadcast signals of single frequency network proposed 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 will be inputted data bit and flow through after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation and code element rotation, symbol interleave form the cascade interweaved coding modulation data piece of FFT on frequency domain, FFT means the fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts the random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM; The 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; Symbol constellations figure mapping mode adopts the Gray code mapping; Symbol interleave adopts the random interleaving mode.
2) the network data management device of single frequency network adopts the cascade interweaved coding modulation data piece of FFT that space-frequency coding device that code check is 1 will form on frequency domain to be modulated on each robust mobile multimedia broadcast signal transmitter branches in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each robust mobile multimedia broadcast signal transmitter branches is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in the assurance network;
3) each robust mobile multimedia broadcast signal transmitter in single frequency network adopts IFFT that the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece D total, IFFT means the fast discrete Fourier inverse transformation;
4) each robust mobile multimedia broadcast signal transmitter in single frequency network is divided equally into two by the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece in order, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 1with the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 2, D total=[D 1, D 2];
5) each robust mobile multimedia broadcast signal transmitter in single frequency network passes through the peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 1, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 2carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D again new, the new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D newadopt following generate pattern to obtain, generate pattern 1 is D new=[D 1, D 2], generate pattern 2 is D new = [ D 1 , 1 / 2 ( D 1 + D 2 ) ] , Generate pattern 3 is D new = [ D 1 , 1 / 2 ( D 1 - D 2 ) ] , Generate pattern 4 is D new = [ 1 / 2 ( D 1 + D 2 ) , D 2 ] , Generate pattern 5 is D new = [ 1 / 2 ( D 1 - D 2 ) , D 2 ] , Generate pattern 6 is D new = [ 1 / 2 ( D 1 + D 2 ) , 1 / 2 ( D 1 - D 2 ) ] , Generate pattern 7 is D new=[D * 1, D 2], generate pattern 8 is D new = [ D * 1 , 1 / 2 ( D * 1 + D 2 ) ] , Generate pattern 9 is D new = [ D * 1 , 1 / 2 ( D * 1 - D 2 ) ] , Generate pattern 10 is D new = [ 1 / 2 ( D * 1 + D 2 ) , D 2 ] , Generate pattern 11 is D new = [ 1 / 2 ( D * 1 - D 2 ) , D 2 ] , Generate pattern 12 is D new = [ 1 / 2 ( D * 1 + D 2 ) , 1 / 2 ( D * 1 - D 2 ) ] , Compare the synthetic cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed piece D of 12 kinds of generate patterns new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls
Figure BSA000005635831000511
and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece will fall
Figure BSA000005635831000512
the corresponding generate pattern information adopted send to operational indicator sequence setting unit, wherein, D * 1expression is to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 1the cascade interweaved coding modulation data sample value of each sky frequency modulation time domain discrete processed carry out the conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains;
6) the real part sequence of each robust mobile multimedia broadcast signal transmitter using training sequence as sequence of plural training in single frequency network, using operational indicator sequence setting unit, set operational indicator sequence is as the imaginary part sequence of sequence of plural training, form the discrete sample block of sequence of plural training on time domain, training sequence, the operational indicator sequence, the length of the discrete sample block of sequence of plural training is all X, the operational indicator sequence is comprising and unique each system parameters and business model information of expressing each robust mobile multimedia broadcast signal transmitter in single frequency network, X gets 512, 1024, in 2048 one,
The discrete sample block of the sequence of plural training that 7) each robust mobile multimedia broadcast signal transmitter in single frequency network will form on time domain repeats continuously to form time domain for 4 times and embeds training sequence discrete sample block on time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, i.e. K=4 * X of training sequence discrete sample block; When X gets 512, K gets 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X gets 1024, K gets 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X gets 2048, K gets 8192, and the frequency interval of corresponding subcarrier is got 1KHz;
8) each robust mobile multimedia broadcast signal transmitter in single frequency network will fall the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece, as frame;
9) each robust mobile multimedia broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece be frame using Cyclic Prefix as the protection interval, to form signal frame, the length of Cyclic Prefix is C; When X gets 512, C gets 1/4 of K size; When X gets 1024, C gets 1/8 of K size; When X gets 2048, C gets 1/16 of K size;
10) each robust 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;
11) each robust mobile multimedia broadcast signal transmitter in single frequency network by the baseband signal up-conversion to carrier wave.
The embodiment modulated according to the single frequency network transmitter signal framing of robust framing modulation method for mobile multi-media broadcast signals of single frequency network of the present invention as shown in Figure 2, specifically is implemented as follows:
The network data management device of single frequency network will be inputted flow through Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation of data bit and form the cascade interweaved coding modulation data piece of FFT with code element rotation, symbol interleave on frequency domain; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts the random interleaving mode; ; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM; The 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; Symbol constellations figure mapping mode adopts the Gray code mapping; Symbol interleave adopts the random interleaving mode; Adopt the cascade interweaved coding modulation data piece of FFT that space-frequency coding device that code check is 1 will form on frequency domain to be modulated on each robust mobile multimedia broadcast signal transmitter branches in single frequency network and form the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each robust mobile multimedia broadcast signal transmitter branches is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in the assurance network; Through IFFT, it is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece again, generates and choose by the peak-to-average power ratio adjustment unit the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of the peak-to-average power ratio piece that falls that wherein there is 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 cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is comprised of subcarrier.The length of the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is K; When X gets 512, corresponding K gets 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X gets 1024, corresponding K gets 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X gets 2048, corresponding K gets 8192, and the frequency interval of corresponding subcarrier is got 1KHz.The real part sequence of each robust mobile multimedia broadcast signal transmitter using training sequence as sequence of plural training in single frequency network, the imaginary part sequence using the operational indicator sequence as sequence of plural training, form the discrete sample block of sequence of plural training on time domain, then it is repeated to form for 4 times continuously time domain embedding training sequence discrete sample block on time domain.The length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and X gets in 512,1024,2048, and the length that time domain embeds training sequence discrete sample block is K, K=4 * X.Training sequence, operational indicator sequence as each robust mobile multimedia broadcast signal transmitter in single frequency network form by a series of 1 or-1, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other; The training sequence that meets above-mentioned feature can and be realized as walsh sequence, the Hadamard sequences of orthogonal sequence or the orthogonal sequence produced by other modes by one group of Phase shift m sequence of a kind of specific type as pseudo-random number sequence; Each different operational indicator sequence is comprising and unique each system parameters and business model information of expressing each robust mobile multimedia broadcast signal transmitter in single frequency network.Each robust mobile multimedia broadcast signal transmitter in single frequency network will fall the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece, as frame; Fall in the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece and insert Cyclic Prefix as the protection interval at time domain embedding training sequence, form signal frame.Length as the Cyclic Prefix of protecting interval is C; When X gets 512, corresponding C gets 1/4 of K size; When X gets 1024, corresponding C gets 1/8 of K size; When X gets 2048, corresponding C gets 1/16 of K size.Each robust 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.When X gets 512, the corresponding signal to signal frame carries out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.1; When X gets 1024, the corresponding signal to signal frame carries out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.05; When X gets 2048, the corresponding signal to signal frame carries out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.025.
The above has been described in detail specific embodiments of the invention by reference to the accompanying drawings, but the present invention is not limited to above-described embodiment, and in the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.

Claims (5)

1. a robust 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 will be inputted data bit and flow through after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, code element modulation and code element rotation, symbol interleave form the cascade interweaved coding modulation data piece of FFT on frequency domain, BCH means Bose Chaudhuri Hocquenghem, LDPC means Low Density Parity Check, and the length of the cascade interweaved coding modulation data piece of FFT is K;
2) the network data management device of single frequency network adopts the cascade interweaved coding modulation data piece of FFT that space-frequency coding device that code check is 1 will form on frequency domain to be modulated on each robust mobile multimedia broadcast signal transmitter branches in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each robust mobile multimedia broadcast signal transmitter branches is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in the assurance network;
3) each robust mobile multimedia broadcast signal transmitter in single frequency network adopts IFFT that the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece D total;
4) each robust mobile multimedia broadcast signal transmitter in single frequency network is divided equally into two by the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece in order, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 1with the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 2, D total=[D 1, D 2];
5) each robust mobile multimedia broadcast signal transmitter in single frequency network all adopts 12 kinds of generate patterns to pass through the peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 1, the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 2carry out that signal adds, subtracts, the operation independent of conjugation is processed or combinatorial operation is processed and the synthetic new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D again new, compare these the 12 kinds of generate patterns cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D of synthesized separately newand choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls
Figure FSB0000113104960000011
the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece will fall
Figure FSB0000113104960000012
the corresponding generate pattern information adopted send to operational indicator sequence setting unit, wherein, D * 1expression is to the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed sub-block D 1the cascade interweaved coding modulation data sample value of each sky frequency modulation time domain discrete processed carry out the conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains, in 12 kinds of adopted generate patterns, generate pattern 1 is D new=[D 1, D 2], generate pattern 2 is
Figure FSB0000113104960000013
generate pattern 3 is D new = [ D 1 , 1 / 2 ( D 1 - D 2 ) ] , Generate pattern 4 is D new = [ 1 / 2 ( D 1 + D 2 ) , D 2 ] , Generate pattern 5 is D new = [ 1 / 2 ( D 1 - D 2 ) , D 2 ] , Generate pattern 6 is D new = [ 1 / 2 ( D 1 + D 2 ) , 1 / 2 ( D 1 - D 2 ) ] , Generate pattern 7 is D new=[D * 1, D 2], generate pattern 8 is generate pattern 9 is D new = [ D * 1 , 1 / 2 ( D * 1 - D 2 ) ] , Generate pattern 10 is D new = [ 1 / 2 ( D * 1 + D 2 ) , D 2 ] , Generate pattern 11 is
Figure FSB00001131049600000111
generate pattern 12 is D new = [ 1 / 2 ( D * 1 + D 2 ) , 1 / 2 ( D * 1 - D 2 ) ] ;
6) the real part sequence of each robust mobile multimedia broadcast signal transmitter using training sequence as sequence of plural training in single frequency network, using operational indicator sequence setting unit, set operational indicator sequence is as the imaginary part sequence of sequence of plural training, form the discrete sample block of sequence of plural training on time domain, training sequence, the operational indicator sequence, the length of the discrete sample block of sequence of plural training is all X, the operational indicator sequence is comprising and unique each system parameters and business model information of expressing each robust mobile multimedia broadcast signal transmitter in single frequency network, X gets in 512,1024,2048,
The discrete sample block of the sequence of plural training that 7) each robust mobile multimedia broadcast signal transmitter in single frequency network will form on time domain repeats continuously to form time domain for 4 times and embeds training sequence discrete sample block on time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, i.e. K=4 * X of training sequence discrete sample block;
8) each robust mobile multimedia broadcast signal transmitter in single frequency network will fall the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece, as frame;
9) each robust mobile multimedia broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece be frame using Cyclic Prefix as the protection interval, to form signal frame, the length of Cyclic Prefix is C; When X gets 512, K gets 2048, C and gets 1/4 of K size; When X gets 1024, K gets 4096, C and gets 1/8 of K size; When X gets 2048, K gets 8192, C and gets 1/16 of K size;
10) each robust 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;
11) each robust mobile multimedia broadcast signal transmitter in single frequency network by the baseband signal up-conversion to carrier wave.
2. by the robust framing modulation method for mobile multi-media broadcast signals of single frequency network of claim 1, it is characterized in that: described training sequence, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics.
3. by the robust framing modulation method for mobile multi-media broadcast signals of single frequency network of claim 1, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
4. by the robust framing modulation method for mobile multi-media broadcast signals of single frequency network of claim 1, it is characterized in that: the encoding rate of described LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts the random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM; The 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; Symbol constellations figure mapping mode adopts the Gray code mapping; Symbol interleave adopts the random interleaving mode.
5. by the robust framing modulation method for mobile multi-media broadcast signals of single frequency network of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described empty frequency modulation FFT processed is comprised of subcarrier; When X gets 512, sub-carrier number gets 2048, and the frequency interval of subcarrier is got 4KHz; When X gets 1024, sub-carrier number gets 4096, and the frequency interval of subcarrier is got 2KHz; When X gets 2048, sub-carrier number gets 8192, and the frequency interval of subcarrier is got 1KHz.
CN2011102483351A 2011-08-22 2011-08-22 Robust framing modulation method for mobile multi-media broadcast signals of single frequency network Expired - Fee Related CN102263742B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011102483351A CN102263742B (en) 2011-08-22 2011-08-22 Robust framing modulation method for mobile multi-media broadcast signals of single frequency network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011102483351A CN102263742B (en) 2011-08-22 2011-08-22 Robust framing modulation method for mobile multi-media broadcast signals of single frequency network

Publications (2)

Publication Number Publication Date
CN102263742A CN102263742A (en) 2011-11-30
CN102263742B true CN102263742B (en) 2013-12-11

Family

ID=45010201

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011102483351A Expired - Fee Related CN102263742B (en) 2011-08-22 2011-08-22 Robust framing modulation method for mobile multi-media broadcast signals of single frequency network

Country Status (1)

Country Link
CN (1) CN102263742B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103763082A (en) * 2014-01-13 2014-04-30 宁波大学 Robust mobile signal framing modulation method for multimedia broadcast single frequency network
CN103795671A (en) * 2014-01-13 2014-05-14 宁波大学 Single-frequency-network robust mobile multimedia broadcast signal framing and modulating method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101383803A (en) * 2008-10-27 2009-03-11 宁波大学 Digital television ground broadcast transmitter space-frequency modulation method based on embedded training sequence
CN101420410A (en) * 2008-10-27 2009-04-29 宁波大学 Interference resistant modulation method for digital television terrestrial broadcast transmitter
CN101431503A (en) * 2008-10-27 2009-05-13 宁波大学 Space-frequency modulation method for digital television ground broadcasting transmitter
CN101778078A (en) * 2010-03-03 2010-07-14 宁波大学 Anti-jamming wireless multimedia broadcasting signal transmission method
CN101778077A (en) * 2010-03-03 2010-07-14 宁波大学 Robust wireless multimedia broadcast signal transmission method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101383803A (en) * 2008-10-27 2009-03-11 宁波大学 Digital television ground broadcast transmitter space-frequency modulation method based on embedded training sequence
CN101420410A (en) * 2008-10-27 2009-04-29 宁波大学 Interference resistant modulation method for digital television terrestrial broadcast transmitter
CN101431503A (en) * 2008-10-27 2009-05-13 宁波大学 Space-frequency modulation method for digital television ground broadcasting transmitter
CN101778078A (en) * 2010-03-03 2010-07-14 宁波大学 Anti-jamming wireless multimedia broadcasting signal transmission method
CN101778077A (en) * 2010-03-03 2010-07-14 宁波大学 Robust wireless multimedia broadcast signal transmission method

Also Published As

Publication number Publication date
CN102263742A (en) 2011-11-30

Similar Documents

Publication Publication Date Title
CN102281230B (en) Multimedia broadcast mobile signal robust framing modulation method
CN102255858B (en) Multimedia broadcast single-frequency robust mobile signal framing modulation method
CN102394852B (en) Single-frequency network anti-fading wireless multimedia broadcasting signal framing modulation method
CN102263742B (en) Robust framing modulation method for mobile multi-media broadcast signals of single frequency network
CN102307172B (en) Framing and modulating method for robustness wireless multimedia broadcast signal with single frequency network
CN102263747B (en) Method for transmitting robust mobile digital broadcast signals in single frequency network
CN102263732B (en) Robust wireless signal transmission method for digital broadcasting single frequency network
CN102263727B (en) Interference-resistance framing modulation method for mobile signals of multimedia broadcasting single frequency network
CN102281246B (en) Anti-fading method for transmitting wireless digital broadcast signal in single frequency network
CN102281234B (en) Multimedia broadcast mobile signal anti-fading framing modulation method
CN102271111B (en) Anti-fading mobile multimedia broadcasting signal framing modulation method
CN102291358B (en) Robust multi-media mobile broadcast signal framing modulation method
CN102255849B (en) Robust method for framing and modulating wireless multimedia broadcast signal
CN102271117B (en) Anti-interference multimedia wireless broadcast signal framing modulation method
CN102255861B (en) Robust digital mobile broadcast signal transmitting method
CN102263743B (en) Anti-interference mobile multimedia broadcast signal framing modulation method for single-frequency network
CN102255860B (en) Anti-interference digital mobile broadcasting signal transmission method
CN102255857B (en) Multimedia broadcast single-frequency network anti-fading mobile signal framing modulation method
CN102271118B (en) Robust multimedia wireless broadcast signal framing modulation method
CN102263741B (en) Method for framing and modulating anti-fading mobile multimedia broadcasting signal of single frequency network
CN102263757B (en) Anti-fading mobile signal transmission method for digital broadcast single-frequency network
CN102281245B (en) Single frequency network robustness wireless digital broadcast signal transmission method
CN102281239B (en) Anti-interference multimedia mobile broadcast signal framing modulation method
CN102263749B (en) Anti-fading mobile digital broadcast signal transmission method for single-frequency network
CN102263758B (en) Method for transmitting robust mobile signals in digital broadcast single frequency network

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CB03 Change of inventor or designer information

Inventor after: Xu Lei

Inventor before: Zheng Ziwei

Inventor before: Xu Tiefeng

Inventor before: Nie Qiuhua

Inventor before: He Jiaming

CB03 Change of inventor or designer information
TR01 Transfer of patent right

Effective date of registration: 20170927

Address after: The Haihe River Road Yancheng District of Luohe City, Henan province 462000 40 Hospital No. 1 Building 2 unit 502

Patentee after: Xu Lei

Address before: 315211 Zhejiang Province, Ningbo Jiangbei District Fenghua Road No. 818

Patentee before: Ningbo University

TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20180214

Address after: 315211 Zhejiang Province, Ningbo Jiangbei District Fenghua Road No. 818

Patentee after: Ningbo University

Address before: The Haihe River Road Yancheng District of Luohe City, Henan province 462000 40 Hospital No. 1 Building 2 unit 502

Patentee before: Xu Lei

TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20180315

Address after: 102600, room 2, building 2212, center 3, 2 Xinghua street, Daxing District, Beijing

Patentee after: BEIJING YONGBO TECHNOLOGY CO.,LTD.

Address before: 315211 Zhejiang Province, Ningbo Jiangbei District Fenghua Road No. 818

Patentee before: Ningbo University

TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20180416

Address after: The Haihe River Road Yancheng District of Luohe City, Henan province 462000 40 Hospital No. 1 Building 2 unit 502

Patentee after: Xu Lei

Address before: 102600, No. 3, building 2, building 4, Paradise Road, Beijing, Daxing District, 1, unit 317

Patentee before: BEIJING ZHITOUJIA INTELLECTUAL PROPERTY OPERATION CO.,LTD.

Effective date of registration: 20180416

Address after: 102600, No. 3, building 2, building 4, Paradise Road, Beijing, Daxing District, 1, unit 317

Patentee after: BEIJING ZHITOUJIA INTELLECTUAL PROPERTY OPERATION CO.,LTD.

Address before: 102600, room 2, building 2212, center 3, 2 Xinghua street, Daxing District, Beijing

Patentee before: BEIJING YONGBO TECHNOLOGY CO.,LTD.

TR01 Transfer of patent right
CP02 Change in the address of a patent holder

Address after: 225300 Yangzi Jiangnan Road 80, Jiangsu port area, Taizhou

Patentee after: Xu Lei

Address before: 462000 No. 2, unit 1, 1 Haihe Road, 40 District, Luohe, Henan.

Patentee before: Xu Lei

CP02 Change in the address of a patent holder
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131211

Termination date: 20180822

CF01 Termination of patent right due to non-payment of annual fee