CN103763252A - Anti-fading multi-media mobile radio signal framing modulation method - Google Patents
Anti-fading multi-media mobile radio signal framing modulation method Download PDFInfo
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Abstract
The invention discloses an anti-fading multi-media mobile radio signal framing modulation method and relates to a hybrid framing modulation scheme of the time domain and the frequency domain. Due to the cascade interleaved coded modulation, the training sequence optimization design, the signal generating scheme and the signal selection method of the anti-fading multi-media mobile radio signal framing modulation method, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals, and the method has the advantages of being low in peak average power rate, 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 anti-fading multimedia mobile 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 mobile broadcast communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Multimedia Mobile broadcast signal transmission machine framing modulator approach is to realize the key technology of the anti-fading Multimedia Mobile broadcast of reliable digit TV.
Utilizing digital TV multimedia mobile 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 the anti-fading Multimedia Mobile broadcast transmission system of new-generation digital TV satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of anti-fading multimedia mobile broadcast signal framing modulation method just, can meet the needs that High Data Rate can be controlled the anti-fading Multimedia Mobile broadcasting transmitting of multi-service Digital Television.
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?IEEESpecial?Issue?on?Global?Digi?tal?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 the anti-fading Multimedia Mobile broadcast issue of multi-service Digital Television, proposed a kind of anti-fading multimedia mobile broadcast signal framing modulation method.
A kind of anti-fading multimedia mobile broadcast signal framing modulation method that the present invention proposes, is characterized in that it comprises the following steps:
1) anti-fading Multimedia Mobile broadcast signal transmission machine is flowed through the input data bit of oneself after RS coding, convolutional interleave, multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation and code element rotation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, RS represents Reed-Solomon, 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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
ne, 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
5) anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) anti-fading Multimedia Mobile broadcast signal transmission machine by baseband signal up-conversion to carrier wave.
Anti-fading multimedia mobile broadcast signal framing modulation method according to above-mentioned, is characterized in that: anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile broadcast signal transmission machine has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of anti-fading Multimedia Mobile broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing Multimedia Mobile broadcast signal transmission machine; The cascade interweaved coding modulation data piece of FFT of anti-fading Multimedia Mobile 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; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; 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 anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile broadcast signal transmission machine, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that anti-fading Multimedia Mobile 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.Code element modulation rotates with code element the diversity that mobile multimedia broadcast signal is provided.Each different operational indicator sequence of anti-fading Multimedia Mobile broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing Multimedia Mobile broadcast signal transmission machine, can, so that digital TV multimedia mobile 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 TV multimedia mobile broadcast transmission.
Accompanying drawing explanation
Fig. 1 is the embodiment schematic diagram according to certain transmitter of anti-fading multimedia mobile 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 anti-fading multimedia mobile 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 anti-fading multimedia mobile 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 anti-fading Multimedia Mobile broadcast signal transmission machine is flowed through the input data bit of oneself after RS coding, convolutional interleave, multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation and code element rotation, 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; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode.
2) this certain anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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
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
dnew=[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
*very represent 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
*even expression 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) anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) anti-fading Multimedia Mobile broadcast signal transmission machine by baseband signal up-conversion to carrier wave.
Embodiment according to certain transmitter signal framing modulation of anti-fading multimedia mobile broadcast signal framing modulation method of the present invention, as shown in Figure 2, is specifically implemented as follows:
This certain anti-fading Multimedia Mobile broadcast signal transmission machine is by flow through RS coding of the input data bit of oneself, convolutional interleave, multi code Rate of Chinese character is deleted remaining convolutional encoding, code element modulation and code element rotation, 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; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode.
The FFT data block of this certain anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing anti-fading Multimedia Mobile broadcast signal transmission machine.
The time domain of this certain anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile broadcast signal transmission machine signal frame is 1/16 of FFT data block length K.
This certain Multimedia Mobile 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. an anti-fading multimedia mobile broadcast signal framing modulation method, is characterized in that it comprises the following steps:
1) anti-fading Multimedia Mobile broadcast signal transmission machine is flowed through the input data bit of oneself after RS coding, convolutional interleave, multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation and code element rotation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, RS represents Reed-Solomon, 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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
*very represent 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
*even expression 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) anti-fading Multimedia Mobile 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 anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile 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) anti-fading Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) anti-fading Multimedia Mobile broadcast signal transmission machine by baseband signal up-conversion to carrier wave.
2. by the anti-fading multimedia mobile 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 anti-fading multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that: described C gets 1/16 of K; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode.
4. by the anti-fading multimedia mobile 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 anti-fading multimedia mobile 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 anti-fading multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that: described G gets 1/8 of L.
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