CN103780539A - Robust wireless multi-media radio signal framing modulation method - Google Patents
Robust wireless multi-media radio signal framing modulation method Download PDFInfo
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- CN103780539A CN103780539A CN201410023860.7A CN201410023860A CN103780539A CN 103780539 A CN103780539 A CN 103780539A CN 201410023860 A CN201410023860 A CN 201410023860A CN 103780539 A CN103780539 A CN 103780539A
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Abstract
The invention discloses a robust wireless multi-media radio signal framing modulation method which is a framing modulation scheme with the time domain and the frequency domain mixed. According to the robust wireless multi-media radio signal framing modulation method, cascading interleaving coding modulation, training sequence optimization design, a signal generation mode and a signal selection method are adopted, and therefore original signals of OFDM signals can be easily processed, recovered and obtained at a receiver end. The robust wireless multi-media radio signal framing modulation method has the advantages that the peak-to-average power ratio is low, the synchronization time is short, channel fading is resisted, and multiple services can be controlled.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of robust wireless multi-media broadcast signal framing modulator approach.
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, plays conclusive effect for whole system performance, 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 can resist frequency selectivity and channel time, 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.
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 the symbol sebolic addressing that equals or exceeds 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 make coding and modulated process is relatively independent and expand diversity order to different binary bits number from different multi-system symbolic numbers, thereby the bit error performance that diversity order is improved significantly and has 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 robust 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 robust 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 robust wireless multi-media broadcast signal framing modulator approach just, can meet High Data Rate and can control the needs of multi-service Digital Television robust 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.Li?ss.“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 wireless multi-media broadcast issue, proposed a kind of robust wireless multi-media broadcast signal framing modulator approach.
A kind of robust wireless multi-media broadcast signal framing modulator approach that the present invention proposes, is characterized in that it comprises the following steps:
1) robust wireless multi-media broadcast signal transmitter is by the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code (the Bose Chaudhuri Hocquenghem that flows through, BCH), Bit Interleave, LDPC (the Low Density Parity Check that encodes, LDPC), on frequency domain, form the cascade interweaved coding modulation data piece of FFT after code element modulation, symbol interleave, the length of the cascade interweaved coding modulation data piece of FFT is K;
2) robust wireless multi-media broadcast signal transmitter adopts IFFT that cascade interweaved FFT coding modulation data piece 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 wireless multi-media broadcast signal transmitter separates successively and generates the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete by cascade interweaved time domain discrete coding modulation data sample value piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete
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 wireless multi-media broadcast signal transmitter 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
the relatively 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
* veryrepresent 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
* evenrepresent 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter; 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) robust wireless multi-media broadcast signal transmitter by baseband signal up-conversion to carrier wave.
According to above-mentioned robust wireless multi-media broadcast signal framing modulator approach, it is characterized in that: robust wireless multi-media broadcast signal transmitter 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 separate successively the time domain discrete strange sub-block of cascade interweaved coding modulation data sample value of generation and the even sub-block of the cascade interweaved coding modulation data sample value of time domain discrete according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete 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 robust wireless multi-media broadcast signal transmitter is made up 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
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, 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 wireless multi-media broadcast signal transmitter signal frame is 1/16 of the cascade interweaved coding modulation data block length of FFT K; The operational indicator sequence of robust wireless multi-media broadcast signal transmitter has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of robust wireless multi-media broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing wireless multi-media broadcast signal transmitter; The cascade interweaved coding modulation data piece of FFT of robust wireless multi-media broadcast signal transmitter is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate of LDPC coding 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; 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 separates successively and 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, 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 (or imaginary part) of the ofdm signal in the time that number of sub carrier wave is larger is multiple Gaussian random process and whose amplitude obeys Rayleihg 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that robust wireless multi-media 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.Insert time domain embedding training sequence using Cyclic Prefix as protection interval 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 wireless multi-media broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing wireless multi-media broadcast signal transmitter, 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 according to the embodiment schematic diagram of certain transmitter of robust wireless multi-media broadcast signal framing modulator approach of the present invention.
Fig. 2 is according to the embodiment schematic diagram of certain transmitter signal framing modulation of robust wireless multi-media broadcast signal framing modulator approach 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 wireless multi-media broadcast signal framing modulator approach proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) this certain robust wireless multi-media broadcast signal transmitter is flowed through the input data bit of oneself after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, 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 of LDPC coding 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; Symbol interleave adopts random interleaving mode.
2) this certain robust wireless multi-media broadcast signal transmitter adopts IFFT that cascade interweaved FFT coding modulation data piece 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 wireless multi-media broadcast signal transmitter separates successively and generates the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete by cascade interweaved time domain discrete coding modulation data sample value piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete
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 wireless multi-media broadcast signal transmitter 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
the relatively 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
* veryrepresent 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
* evenrepresent 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter; 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) robust wireless multi-media broadcast signal transmitter by baseband signal up-conversion to carrier wave.
According to the embodiment of certain transmitter signal framing modulation of robust wireless multi-media broadcast signal framing modulator approach of the present invention, as shown in Figure 2, be specifically implemented as follows:
This certain robust wireless multi-media broadcast signal transmitter is by the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code of flowing through, Bit Interleave, LDPC coding, code element modulation, after symbol interleave, on frequency domain, form the cascade interweaved coding modulation data piece of FFT, be transformed to again the discrete cascade interweaving encoding modulating data sample value piece of time domain through IFFT, generate and 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 corresponding institute employing is sent to operational indicator sequence setting unit simultaneously by peak-to-average power ratio adjustment unit.The encoding rate of LDPC coding 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; Symbol interleave adopts random interleaving mode.
The FFT data block of this certain robust wireless multi-media broadcast signal transmitter is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
The training sequence of this certain robust wireless multi-media broadcast signal transmitter is made up 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
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of this certain robust wireless multi-media broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing robust wireless multi-media broadcast signal transmitter.
The time domain of this certain robust wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter signal frame is 1/16 of FFT data block length K.
This certain wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal framing modulator approach, is characterized in that it comprises the following steps:
1) robust wireless multi-media broadcast signal transmitter is flowed through the input data bit of oneself after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, LDPC coding, 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, LDPC represents Low Density Parity Check, 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 wireless multi-media broadcast signal transmitter adopts IFFT that cascade interweaved FFT coding modulation data piece 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 wireless multi-media broadcast signal transmitter separates successively and generates the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete by cascade interweaved time domain discrete coding modulation data sample value piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete
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 wireless multi-media broadcast signal transmitter 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
the relatively 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) robust wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter; 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter 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 wireless multi-media broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) robust wireless multi-media broadcast signal transmitter by baseband signal up-conversion to carrier wave.
2. by the robust wireless multi-media broadcast signal framing modulator approach of claim 1, it is characterized in that: described training sequence is made up 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
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, B has identical symbol lengths L with A.
3. by the robust wireless multi-media broadcast signal framing modulator approach 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; 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; Symbol interleave adopts random interleaving mode.
4. by the robust wireless multi-media broadcast signal framing modulator approach of claim 1, it is characterized in that: described operational indicator sequence has pseudo-random characteristics, realized by one group of Phase shift m sequence.
5. by the robust wireless multi-media broadcast signal framing modulator approach of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
6. by the robust wireless multi-media broadcast signal framing modulator approach of claim 1, it is characterized in that: described G gets 1/8 of L.
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