CN103763239A - Framing modulation method for robust multi-media wireless broadcast signals - Google Patents
Framing modulation method for robust multi-media wireless broadcast signals Download PDFInfo
- Publication number
- CN103763239A CN103763239A CN201410021152.XA CN201410021152A CN103763239A CN 103763239 A CN103763239 A CN 103763239A CN 201410021152 A CN201410021152 A CN 201410021152A CN 103763239 A CN103763239 A CN 103763239A
- Authority
- CN
- China
- Prior art keywords
- time domain
- modulation data
- cascade interweaved
- interweaved coding
- data sample
- 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
- Radio Transmission System (AREA)
Abstract
The invention discloses a framing modulation method for robust multi-media wireless broadcast signals. The method is a framing modulation scheme with time domain and frequency domain mixed. According to the framing modulation method for the robust multi-media wireless broadcast signals, cascade interleaving code modulation is performed, training sequence optimization design is performed, signal generating modes are implemented, and a signal selecting method is implemented, so that original signals of OFDM signals are easy to obtain through processing and recovering at a receiver terminal, and the framing modulation method has the advantages of being low in peak-to-average power ratio, short in synchronization time and resistant to channel fading and providing multiple controllable services.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of robust multimedia wireless broadcast signal framing modulation method.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital television and broadcasting transinission system, as the important component part of digital television 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 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 broadcasting correlation technique, the emphasis that various countries pay close attention to is at present that the digital television broadcasting how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Framing modulation technique is the key technology of digital television 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 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.
Under multidiameter fading channel, can be by coding, interweave and the cascade optimal design of modulation scheme reaches large as far as possible signal diversifying exponent number, to obtain independent decline in equaling or exceeding the symbol sebolic addressing of minimum free distance.The different coding form of cascade can make full use of the advantage of different coding technology; Between coding and code element modulation, insert bit interleaver, can so that coding and modulated process is relatively independent and from different multi-system symbolic numbers, expand diversity order to different binary bits number, thereby the bit error performance that diversity order is improved significantly and has had under multidiameter fading channel.
In practical communication environment, digital TV multimedia wireless broadcast communication systematic function is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Multi-media radio broadcast signal transmission machine framing modulator approach is to realize the key technology of reliable digit TV robust multi-media radio broadcast.
Utilizing digital TV multimedia radio 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 robust multi-media radio broadcast transmission system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of robust multimedia wireless broadcast signal framing modulation method just, can meet the needs that High Data Rate can be controlled multi-service Digital Television robust multi-media radio broadcasting transmitting.
Wish is done more deep understanding to patent background can be with reference to following documents and materials:
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimedia?communications”.
Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digital?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.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?coded?modulation，”IEEE?Trans.Information?Theory，vol.44，no.3，pp.927-946，May1998.
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，May1998.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service Digital Television robust multi-media radio broadcast issue, proposed a kind of robust multimedia wireless broadcast signal framing modulation method.
A kind of robust multimedia wireless broadcast signal framing modulation method that the present invention proposes, is characterized in that it comprises the following steps:
1) robust multi-media radio broadcast signal transmission machine is by the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code (the Bose Chaudhuri Hocquenghem that flows through, BCH), Bit Interleave, multi code Rate of Chinese character form the cascade interweaved coding modulation data piece of FFT after deleting remaining convolutional encoding, code element modulation, symbol interleave on frequency domain, the length of the cascade interweaved coding modulation data piece of FFT is K;
2) robust multi-media radio broadcast signal transmission machine adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
total=[d
0, d
1..., d
k-2, d
k-1];
3) robust multi-media radio broadcast signal transmission machine is by the cascade interweaved coding modulation data sample value of time domain discrete piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separated strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete that generates
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
even=[d
1, d
3..., d
k-3, d
k-1];
4) robust multi-media radio broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
very, the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
evencarry out signal power adjustment and corresponding signal and process also the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
new, the cascade interweaved coding modulation data sample value of new time domain discrete 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 18 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
and the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete 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 the cascade interweaved coding modulation data sample value of time domain discrete
verythe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains; D
* evenexpression is to the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
5) robust multi-media radio broadcast signal transmission machine Insert service index series after training sequence 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 robust multi-media radio broadcast signal transmission machine; Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete data sample block of training sequence discrete sample block;
6) robust multi-media radio broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete 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 time domain discrete piece, as frame;
7) robust multi-media radio broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
8) robust multi-media radio broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) robust multi-media radio broadcast signal transmission machine by baseband signal up-conversion to carrier wave.
Robust multimedia wireless broadcast signal framing modulation method according to above-mentioned, is characterized in that: robust multi-media radio broadcast signal transmission machine the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls by the cascade interweaved coding modulation data sample value of time domain discrete piece demultiplexing and carry out signal power adjustment and corresponding signal according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separated time domain discrete strange sub-block of cascade interweaved coding modulation data sample value generating and the even sub-block of the cascade interweaved coding modulation data sample value of time domain discrete and process and pass through 18 kinds of generate patterns of particular design and again synthesize; The training sequence of robust multi-media radio broadcast signal transmission machine 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 robust multi-media radio broadcast signal transmission machine signal frame is 1/16 of the cascade interweaved coding modulation data block length of FFT K; The operational indicator sequence of robust multi-media radio broadcast signal transmission machine has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of robust multi-media radio broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing multi-media radio broadcast signal transmission machine; The cascade interweaved coding modulation data piece of FFT of robust multi-media radio broadcast signal transmission machine is comprised of subcarrier, and the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.
Feature of the present invention:
The present invention is the framing modulation scheme that a kind of time-domain and frequency-domain mixes.The cascade interweaved coding modulation data sample value of time domain discrete of the present invention piece demultiplexing also generates the time domain discrete strange sub-block of cascade interweaved coding modulation data sample value and the even sub-block of the cascade interweaved coding modulation data sample value of time domain discrete and the corresponding signal power adjustment of carrying out and signal processing according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separation, what by particular design 18 kinds fell the generate pattern of the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece and had a minimum peak-to-average power ratio falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete 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 robust multi-media radio broadcast signal transmission machine is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, it is by falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece that the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls in the time domain embedding training sequence of robust multi-media radio broadcast signal transmission machine, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that robust multi-media radio 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 cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece to form signal frame, can reduce the interference effect between adjacent signals frame.Input data are carried out to cascade interweaved coded modulation and improved diversity order, the bit error performance that communication system has been had under multidiameter fading channel.Each different operational indicator sequence of robust multi-media radio broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing multi-media radio broadcast signal transmission machine, can, so that digital TV multimedia radio 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 TV multimedia radio transmission.
Accompanying drawing explanation
Fig. 1 is the embodiment schematic diagram according to certain transmitter of robust multimedia wireless broadcast signal framing modulation method of the present invention.
Fig. 2 is according to the embodiment schematic diagram of certain transmitter signal framing modulation of robust multimedia wireless broadcast signal framing modulation method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The embodiment of certain transmitter of the robust multimedia wireless broadcast signal framing modulation method proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) this certain robust multi-media radio broadcast signal transmission machine is flowed through the input data bit of oneself after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, and the length of the cascade interweaved coding modulation data piece of FFT is K; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.
2) this certain robust multi-media radio broadcast signal transmission machine adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
total=[d
0, d
1..., d
k-2, d
k-1];
3) robust multi-media radio broadcast signal transmission machine is by the cascade interweaved coding modulation data sample value of time domain discrete piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separated strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete that generates
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
even=[d
1, d
3..., d
k-3, d
k-1];
4) robust multi-media radio broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
very, the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
evencarry out signal power adjustment and corresponding signal and process also the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
new, the cascade interweaved coding modulation data sample value of new time domain discrete 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 18 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
and the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete 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 the cascade interweaved coding modulation data sample value of time domain discrete
verythe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains; D
* evenexpression is to the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
5) robust multi-media radio broadcast signal transmission machine Insert service index series after training sequence 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 robust multi-media radio broadcast signal transmission machine; Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete data sample block of training sequence discrete sample block;
6) robust multi-media radio broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete 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 time domain discrete piece, as frame;
7) robust multi-media radio broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
8) robust multi-media radio broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) robust multi-media radio broadcast signal transmission machine by baseband signal up-conversion to carrier wave.
Embodiment according to certain transmitter signal framing modulation of robust multimedia wireless broadcast signal framing modulation method of the present invention, as shown in Figure 2, is specifically implemented as follows:
This certain robust multi-media radio broadcast signal transmission machine is by the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code of flowing through, Bit Interleave, multi code Rate of Chinese character is deleted remaining convolutional encoding, code element modulation, after symbol interleave, on frequency domain, form the cascade interweaved coding modulation data piece of FFT, through IFFT, be transformed to again the discrete cascade interweaving encoding modulating data sample value piece of time domain, by peak-to-average power ratio adjustment unit, generate and to choose the cascade interweaved coding modulation data sample value of the peak-to-average power ratio time domain discrete piece that falls wherein with minimum peak-to-average power ratio and the generate pattern information of the corresponding employing of institute is sent to operational indicator sequence setting unit simultaneously.The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.
The FFT data block of this certain robust multi-media radio broadcast signal transmission machine is comprised of subcarrier, and the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz.
The training sequence of this certain robust multi-media radio broadcast signal transmission machine 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.
This certain robust multi-media radio broadcast signal transmission machine Insert service index series after training sequence forms time domain and embeds training sequence discrete sample block in time domain.
The operational indicator sequence of this certain robust multi-media radio broadcast signal transmission machine has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of this certain robust multi-media radio broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing robust multi-media radio broadcast signal transmission machine.
The time domain of this certain robust multi-media radio broadcast signal transmission machine embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete data sample block of training sequence discrete sample block; This certain robust multi-media radio broadcast signal transmission machine will fall peak-to-average power ratio time domain discrete data sample block, 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 time domain discrete data sample block, as frame; This certain robust multi-media radio broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete data sample block be frame using Cyclic Prefix as protection interval, and to form signal frame, the length of Cyclic Prefix is C; The circulating prefix-length C of this certain robust multi-media radio broadcast signal transmission machine signal frame is 1/16 of FFT data block length K.
This certain multi-media radio broadcast signal transmission machine 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 robust multimedia wireless broadcast signal framing modulation method, is characterized in that it comprises the following steps:
1) robust multi-media radio broadcast signal transmission machine is flowed through the input data bit of oneself after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, BCH represents Bose Chaudhuri Hocquenghem, the length of the cascade interweaved coding modulation data piece of FFT is K, and the numerical value of K is got even number;
2) robust multi-media radio broadcast signal transmission machine adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
total=[d
0, d
1..., d
k-2, d
k-1];
3) robust multi-media radio broadcast signal transmission machine is by the cascade interweaved coding modulation data sample value of time domain discrete piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete successively separated strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete that generates
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
even=[d
1, d
3..., d
k-3, d
k-1];
4) robust multi-media radio broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
very, the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
evencarry out signal power adjustment and corresponding signal and process also the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
new, the cascade interweaved coding modulation data sample value of new time domain discrete 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 18 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
and the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete 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 the cascade interweaved coding modulation data sample value of time domain discrete
verythe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains; D
* evenexpression is to the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
5) robust multi-media radio broadcast signal transmission machine Insert service index series after training sequence 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 robust multi-media radio broadcast signal transmission machine; Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete data sample block of training sequence discrete sample block;
6) robust multi-media radio broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete 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 time domain discrete piece, as frame;
7) robust multi-media radio broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
8) robust multi-media radio broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) robust multi-media radio broadcast signal transmission machine by baseband signal up-conversion to carrier wave.
2. by the robust multimedia wireless broadcast signal framing modulation method 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 robust multimedia wireless broadcast signal framing modulation method of claim 1, it is characterized in that: described C gets 1/16 of K; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to a kind of in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping; Symbol interleave adopts random interleaving mode.
4. by the robust multimedia wireless broadcast signal framing modulation method 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 robust multimedia wireless broadcast signal framing modulation method of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is comprised of subcarrier, the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz.
6. by the robust multimedia wireless broadcast signal framing modulation method 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 |
|---|---|---|---|
| CN201410021152.XA CN103763239A (en) | 2014-01-13 | 2014-01-13 | Framing modulation method for robust multi-media wireless broadcast signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410021152.XA CN103763239A (en) | 2014-01-13 | 2014-01-13 | Framing modulation method for robust multi-media wireless broadcast signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103763239A true CN103763239A (en) | 2014-04-30 |
Family
ID=50530401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410021152.XA Pending CN103763239A (en) | 2014-01-13 | 2014-01-13 | Framing modulation method for robust multi-media wireless broadcast signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103763239A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| CN102244639A (en) * | 2011-08-22 | 2011-11-16 | 宁波大学 | Method for framing and modulating wireless multimedia broadcast signals |
| CN102271118A (en) * | 2011-08-22 | 2011-12-07 | 宁波大学 | Robust multimedia wireless broadcast signal framing modulation method |
| 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 CN201410021152.XA patent/CN103763239A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| CN102244639A (en) * | 2011-08-22 | 2011-11-16 | 宁波大学 | Method for framing and modulating wireless multimedia broadcast signals |
| CN102271118A (en) * | 2011-08-22 | 2011-12-07 | 宁波大学 | Robust multimedia wireless broadcast signal framing modulation method |
| CN102882670A (en) * | 2012-09-13 | 2013-01-16 | 电子科技大学 | Synchronous processing method based on CMMB signals |
| CN103326985A (en) * | 2013-07-15 | 2013-09-25 | 浙江师范大学 | Method for reducing peak-to-mean ratio in OFDM (Orthogonal Frequency Division Multiplexing) |
Non-Patent Citations (2)
| Title |
|---|
| DAOUND O,ALANI O: "Reducing the PAPR by utilisation of the LDPC code", 《IET COMMUNICATIONS》 * |
| YANG X,LEE M H: "Low Complexity MIMO-LDPC CDMA Systems over Multipath Channels", 《IEICE TRANSACTIONS ON COMMUNICATIONS》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102255699B (en) | Method for framing and modulating anti-fading wireless multimedia broadcast signals | |
| CN103780538A (en) | Transmission method of anti-interference digital mobile broadcast signals | |
| CN102271116A (en) | Anti-fading multimedia wireless broadcast signal framing modulation method | |
| CN102271117B (en) | Anti-interference multimedia wireless broadcast signal 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 | |
| CN103763256A (en) | Framing modulation method for multimedia movable broadcast signals | |
| CN103763249A (en) | Anti-interference wireless signal transmission method for digital broadcast | |
| CN103763082A (en) | Robust mobile signal framing modulation method for multimedia broadcast single frequency network | |
| CN102281239B (en) | Anti-interference multimedia mobile broadcast signal framing modulation method | |
| CN103763285A (en) | Framing modulation method for robust mobile multi-media broadcast signals | |
| CN103780539A (en) | Robust wireless multi-media radio signal framing modulation method | |
| CN103763247A (en) | Anti-fading multi-media wireless radio signal framing modulation method | |
| CN103780553A (en) | Transmission method of anti-interference digital wireless broadcast signals | |
| CN103780559A (en) | Movable signal anti-interference framing modulation method in multimedia broadcasting | |
| CN103763290A (en) | Method for framing and modulating anti-interference wireless multimedia broadcast signals in single frequency network | |
| CN103763061A (en) | Anti-fading mobile signal framing modulation method for multimedia broadcast single frequency network | |
| CN103763239A (en) | Framing modulation method for robust multi-media wireless broadcast signals | |
| CN103763253A (en) | Framing modulation method for robust multi-media mobile broadcast signals | |
| CN103763252A (en) | Anti-fading multi-media mobile radio signal framing modulation method | |
| CN103780540A (en) | Framing modulation method of anti-fading mobile multimedia broadcasting signals | |
| CN103763279A (en) | Anti-fading wireless multi-media radio signal framing modulation method | |
| CN103780552A (en) | Robust digital wireless radio signal transmission method | |
| CN103780551A (en) | Transmission method of anti-fading digital wireless broadcasting signals | |
| CN103763275A (en) | Robust framing modulation method for wireless signals of multimedia broadcast |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140430 |