CN103763273A - Anti-interference framing modulation method for wireless signals of multimedia broadcast - Google Patents
Anti-interference framing modulation method for wireless signals of multimedia broadcast Download PDFInfo
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Abstract
The invention discloses an anti-interference framing modulation method for wireless signals of a multimedia broadcast, and relates to a mixed framing modulation scheme of the time domain and the frequency domain. According to the bit interleaved coded modulation, the training sequence optimization design, the signal generating scheme and the signal selecting method of the anti-interference framing modulation method for the wireless signals of the multimedia broadcast, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals. The anti-interference framing modulation method for the wireless signals of the multimedia broadcast has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of multimedia broadcasting wireless signal anti-interference 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 (PAPR) that ofdm signal is higher has very high requirement to the range of linearity of amplifier and digital to analog converter, if system linearity scope can not meet the variation of signal, can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between subchannel to be destroyed, produce phase mutual interference, make system performance degradation.Therefore the solution that, must consider how to reduce the probability of occurrence of large peak power signal in ofdm signal and reduce nonlinear distortion impact.
Chnnel coding is the important component part of digital communication system.Under multidiameter fading channel, can be by coding, interweave and the optimal design of modulation scheme reaches large as far as possible signal diversifying exponent number, to obtain independent decline in the symbol sebolic addressing that equals or exceeds minimum free distance.BICM technology (Bit Interleave coded modulation, Bit Interleaved Coded Modulation, BICM) adopt bit interleaver and make coding and modulated process relatively independent, thereby make from different multi-system symbolic numbers, to expand diversity order to different binary bits number, that is to say, its diversity order L is the smallest hamming distance between binary code word sequence.Because making diversity order, BICM technology is improved significantly, therefore, and the bit error performance that communication system has been had under multidiameter fading channel.
In practical communication environment, Digital Television radio multimedium broadcast communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Wireless multi-media broadcast signal transmitter framing modulator approach is to realize the key technology of reliable digit TV anti-interference wireless multi-media broadcast.
Utilizing Digital Television radio multimedium broadcast transmission system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital TV anti-interference wireless multi-media broadcast transmission system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of multimedia broadcasting wireless signal anti-interference framing modulation method just, can meet High Data Rate and can control the needs of multi-service Digital Television anti-interference wireless multi-media 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?mul?timedia?communica?tions”.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.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service Digital Television anti-interference wireless multi-media broadcast issue, proposed a kind of multimedia broadcasting wireless signal anti-interference framing modulation method.
A kind of multimedia broadcasting wireless signal anti-interference framing modulation method that the present invention proposes, is characterized in that it comprises the following steps:
1) the anti-interference transmitter of multimedia broadcast wireless signal is flowed through the input data bit of oneself after multi code Rate of Chinese character is deleted remaining convolutional encoding, Bit Interleave, code element modulation and on frequency domain, is formed FFT Bit Interleave coding modulation data piece, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number;
2) the anti-interference transmitter of multimedia broadcast wireless signal adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
3) the anti-interference transmitter of multimedia broadcast wireless signal separates successively and generates the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation data sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
4) the anti-interference transmitter of multimedia broadcast wireless signal passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
very, the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete Bit Interleave coding modulation data sample value piece D again
new, new time domain discrete Bit Interleave coding modulation data sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of time domain discrete Bit Interleave coding modulation data sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls
and peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
*very represent the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
veryeach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains; D
*even expression the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
eveneach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains;
5) the anti-interference transmitter of multimedia broadcast wireless signal Insert service index series after training sequence forms time-domain training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-interference transmitter of multimedia broadcast wireless signal;
6) the anti-interference transmitter of multimedia broadcast wireless signal inserts Cyclic Prefix to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece as protection interval, peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C;
7) the anti-interference transmitter of multimedia broadcast wireless signal is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece be frame by time-domain training sequence discrete sample block, to form signal frame;
8) the anti-interference transmitter of multimedia broadcast wireless signal adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) the anti-interference transmitter of multimedia broadcast wireless signal by baseband signal up-conversion to carrier wave.
According to above-mentioned multimedia broadcasting wireless signal anti-interference framing modulation method, it is characterized in that: the anti-interference transmitter of multimedia broadcast wireless signal peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and separate successively the strange sub-block of time domain discrete Bit Interleave coding modulation data sample value of generation and the even sub-block of time domain discrete Bit Interleave coding modulation data sample value according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation data sample value and carry out signal power adjustment and corresponding signal and process and pass through 18 kinds of generate patterns of particular design and again synthesize; The training sequence of the anti-interference transmitter of multimedia broadcast wireless signal is comprised of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8; The circulating prefix-length C of the anti-interference transmitter signal frame of multimedia broadcast wireless signal is 1/16 of FFT Bit Interleave coding modulation data block length K; The operational indicator sequence of the anti-interference transmitter of multimedia broadcast wireless signal has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of the anti-interference transmitter of multimedia broadcast wireless signal is comprising and unique each system parameters and business model information of expressing the anti-interference transmitter of multimedia broadcast wireless signal; The FFT Bit Interleave coding modulation data piece of the anti-interference transmitter of multimedia broadcast wireless signal is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; Input data are carried out to multi code Rate of Chinese character, and to delete the encoding rate of remaining convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to the one in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping.
Feature of the present invention:
The present invention is the framing modulation scheme that a kind of time-domain and frequency-domain mixes.Time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing of the present invention also separates successively and generates the time domain discrete Bit Interleave strange sub-block of coding modulation data sample value and the even sub-block of time domain discrete Bit Interleave coding modulation data sample value and the corresponding signal power adjustment of carrying out and signal processing according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation data sample value, what by particular design 18 kinds fell the generate pattern of peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece and had a minimum peak-to-average power ratio falls peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece choosing method, but the very high large peak power signal probability of the maximum peak power that not only can make full use of ofdm signal is very low, the power regularity of distribution that the characteristic that the real part (or imaginary part) of the ofdm signal when number of sub carrier wave is larger is multiple Gaussian random process and whose amplitude obeys Rayleigh distribution and then low complex degree ground effectively change over frame signal reaches the object that reduces peak-to-average power ratio, the amount of information of the required extra transmission of generate pattern adopting is little, be easy to process at receiver end the primary signal of recovering to obtain ofdm signal, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.Training sequence in the signal frame of the anti-interference transmitter of multimedia broadcast wireless signal is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, the signal frame of multimedia broadcast wireless signal transmitter is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece be frame and forming by time-domain training sequence discrete sample block, these have guaranteed that multimedia broadcast wireless signal antijam 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.Cyclic Prefix is inserted and falls peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece to form signal frame body as protection interval, can reduce the interference effect between signal frame head and frame data.Adopt BICM to carry out Bit Interleave coded modulation to input data and improved diversity order, the bit error performance that communication system has been had under multidiameter fading channel.Each different operational indicator sequence of the anti-interference transmitter of multimedia broadcast wireless signal is comprising and unique each system parameters and business model information of expressing the anti-interference transmitter of multimedia broadcast wireless signal, can make Digital Television radio multimedium broadcast transmission system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Framing modulator approach of the present invention has low peak-to-average power ratio, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide High Data Rate can control the plurality of advantages such as multi-service Digital Television radio multimedium broadcasting transmitting.
Accompanying drawing explanation
Fig. 1 is the embodiment schematic diagram according to certain transmitter of multimedia broadcasting wireless signal anti-interference framing modulation method of the present invention.
Fig. 2 is according to the embodiment schematic diagram of certain transmitter signal framing modulation of multimedia broadcasting wireless signal anti-interference 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 multimedia broadcasting wireless signal anti-interference framing modulation method proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) the anti-interference transmitter of this certain multimedia broadcast wireless signal is flowed through the input data bit of oneself after multi code Rate of Chinese character is deleted remaining convolutional encoding, Bit Interleave, code element modulation and on frequency domain, is formed FFT Bit Interleave coding modulation data piece, and the length of FFT Bit Interleave coding modulation data piece is K; Input data are carried out to multi code Rate of Chinese character deletes the multi code Rate of Chinese character of remaining convolutional encoding, Bit Interleave, code element modulation treatment to delete the encoding rate of 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 the one in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping;
2) the anti-interference transmitter of this certain multimedia broadcast wireless signal adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
3) the anti-interference transmitter of this certain multimedia broadcast wireless signal separates successively and generates the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation data sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
4) the anti-interference transmitter of this certain multimedia broadcast wireless signal passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
very, the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete Bit Interleave coding modulation data sample value piece D again
new, new time domain discrete Bit Interleave coding modulation data sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of time domain discrete Bit Interleave coding modulation data sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls
and peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryexpression is to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
veryeach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains; D
* evenexpression is to the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
eveneach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains;
5) the anti-interference transmitter of this certain multimedia broadcast wireless signal Insert service index series after training sequence forms time-domain training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-interference transmitter of multimedia broadcast wireless signal;
6) the anti-interference transmitter of this certain multimedia broadcast wireless signal inserts Cyclic Prefix to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece as protection interval, peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C;
7) the anti-interference transmitter of this certain multimedia broadcast wireless signal is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece be frame by time-domain training sequence discrete sample block, to form signal frame;
8) the anti-interference transmitter of this certain multimedia broadcast wireless signal adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) the anti-interference transmitter of this certain multimedia broadcast wireless signal by baseband signal up-conversion to carrier wave.
According to the embodiment of certain transmitter signal framing modulation of multimedia broadcasting wireless signal anti-interference framing modulation method of the present invention, as shown in Figure 2, be specifically implemented as follows:
The anti-interference transmitter of this certain multimedia broadcast wireless signal is deleted remaining convolutional encoding by the input data bit of oneself multi code Rate of Chinese character of flowing through, Bit Interleave, after code element modulation, on frequency domain, form FFT Bit Interleave coding modulation data piece, through IFFT, be transformed to again the discrete bits interweaving encoding modulating data sample value piece of time domain, by peak-to-average power ratio adjustment unit, generate and choose the peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece that falls wherein with minimum peak-to-average power ratio and the generate pattern information of corresponding institute employing is sent to operational indicator sequence setting unit simultaneously.Input data are carried out to multi code Rate of Chinese character deletes the multi code Rate of Chinese character of remaining convolutional encoding, Bit Interleave, code element modulation treatment to delete the encoding rate of 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 the one in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping.
The FFT Bit Interleave coding modulation data piece of the anti-interference transmitter of this certain multimedia broadcast wireless signal is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
The training sequence of the anti-interference transmitter of this certain multimedia broadcast wireless signal is comprised of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8.
The anti-interference transmitter of this certain multimedia broadcast wireless signal Insert service index series after training sequence forms time-domain training sequence discrete sample block in time domain.
The operational indicator sequence of the anti-interference transmitter of this certain multimedia broadcast wireless signal has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of the anti-interference transmitter of this certain multimedia broadcast wireless signal is comprising and unique each system parameters and business model information of expressing the anti-interference transmitter of multimedia broadcast wireless signal.The anti-interference transmitter of this certain multimedia broadcast wireless signal inserts Cyclic Prefix to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece as protection interval, peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C; The anti-interference transmitter of this certain multimedia broadcast wireless signal is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece be frame by time-domain training sequence discrete sample block, to form signal frame;
The circulating prefix-length C of the anti-interference transmitter signal frame of this certain multimedia broadcast wireless signal is 1/16 of FFT data block length K.
The anti-interference transmitter of this certain multimedia broadcast wireless signal 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 multimedia broadcasting wireless signal anti-interference framing modulation method, is characterized in that it comprises the following steps:
1) the anti-interference transmitter of multimedia broadcast wireless signal is flowed through the input data bit of oneself after multi code Rate of Chinese character is deleted remaining convolutional encoding, Bit Interleave, code element modulation and on frequency domain, is formed FFT Bit Interleave coding modulation data piece, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number;
2) the anti-interference transmitter of multimedia broadcast wireless signal adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
3) the anti-interference transmitter of multimedia broadcast wireless signal separates successively and generates the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation data sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
4) the anti-interference transmitter of multimedia broadcast wireless signal passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
very, the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete Bit Interleave coding modulation data sample value piece D again
new, new time domain discrete Bit Interleave coding modulation data sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of time domain discrete Bit Interleave coding modulation data sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls
and peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryexpression is to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
veryeach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains; D
*even expression the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
eveneach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains;
5) the anti-interference transmitter of multimedia broadcast wireless signal Insert service index series after training sequence forms time-domain training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing the anti-interference transmitter of multimedia broadcast wireless signal;
6) the anti-interference transmitter of multimedia broadcast wireless signal inserts Cyclic Prefix to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece as protection interval, peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C;
7) the anti-interference transmitter of multimedia broadcast wireless signal is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece be frame by time-domain training sequence discrete sample block, to form signal frame;
8) the anti-interference transmitter of multimedia broadcast wireless signal adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) the anti-interference transmitter of multimedia broadcast wireless signal by baseband signal up-conversion to carrier wave.
2. by the multimedia broadcasting wireless signal anti-interference 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 Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A.
3. by the multimedia broadcasting wireless signal anti-interference framing modulation method of claim 1, it is characterized in that: described C gets 1/16 of K; Describedly input data are carried out to multi code Rate of Chinese character delete the multi code Rate of Chinese character of remaining convolutional encoding, Bit Interleave, code element modulation treatment to delete the encoding rate of remaining convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to the one in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping.
4. by the multimedia broadcasting wireless signal anti-interference 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 multimedia broadcasting wireless signal anti-interference framing modulation method of claim 1, it is characterized in that: described FFT Bit Interleave coding modulation data piece is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
6. by the multimedia broadcasting wireless signal anti-interference framing modulation method of claim 1, it is characterized in that: described G gets 1/8 of L.
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