CN103763278A - Transmission method for robust digital mobile broadcast signals - Google Patents
Transmission method for robust digital mobile broadcast signals Download PDFInfo
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- CN103763278A CN103763278A CN201410023815.1A CN201410023815A CN103763278A CN 103763278 A CN103763278 A CN 103763278A CN 201410023815 A CN201410023815 A CN 201410023815A CN 103763278 A CN103763278 A CN 103763278A
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Abstract
The invention discloses a transmission method for robust digital mobile broadcast signals. The method is a framing modulation scheme with time domain and frequency domain mixed. According to the framing modulation method for the robust digital mobile broadcast signals, cascade interleaving code modulation is performed, training sequence optimization design is performed, signal generating modes are implemented, and a signal selecting method is implemented, so that original signals of OFDM signals are easy to obtain through processing and recovering at a receiver terminal, and the framing modulation method has the advantages of being low in peak-to-average power ratio, short in synchronization time and resistant to channel fading and providing multiple controllable services.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of Robust digital mobile broadcast signal transmitting 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.
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 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 Television digital mobile broadcast communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Digital mobile broadcast signal transmission machine transmission method is the key technology that realizes reliable digit TV Robust digital mobile broadcast.
Utilizing Digital Television digital 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 new-generation digital TV Robust digital mobile 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 digital mobile broadcast signal transmitting method just, can meet High Data Rate and can control the needs that multi-service Digital Television Robust digital mobile broadcast transmits.
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?andEmerging?Services，pp.8-21，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stat?ionary?portable?and?mobi1e?use.”Proceedings?ofthe?IEEESpecial?IssueonGlobal?Digital?Television：TechnologyandEmergingServices，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmi?ssion?systems?for?ISDB-T，”Proceedings?of?the?IEEE，?Special?Issue?on?Global?Digi?tal?Tele?vision：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?coded?modulation，”IEEE?Trans.Information?Theory，vo1.44，no.3，pp.927-946，May1998.
S.Benedetto，D.Divsalar，G.Montorsi，and?F.Poi?lara，“Serial?concatenation?of?interleaved?codes：performance?analysis，design，and?iterative?decoding，”IEEE?Trans.Inform.Theory，vo1.44，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 digital mobile broadcast problem, proposed a kind of Robust digital mobile broadcast signal transmitting method.
A kind of Robust digital mobile broadcast signal transmitting method that the present invention proposes, is characterized in that it comprises the following steps:
1) Robust digital mobile broadcasting transmitter converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow;
2) Robust digital mobile broadcasting transmitter is flowed through the input data bit of oneself after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation and code element rotation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, BCH represents Bose Chaudhuri Hocquenghem, the length of the cascade interweaved coding modulation data piece of FFT is K, and the numerical value of K is got even number;
3) Robust digital mobile broadcasting 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];
4) Robust digital mobile broadcasting 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];
5) Robust digital mobile broadcasting 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
generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is
generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is
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
* veryexpression is to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
verythe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains; D
* evenexpression is to the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) Robust digital mobile broadcasting 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 digital mobile broadcasting 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;
7) Robust digital mobile broadcasting 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;
8) Robust digital mobile broadcasting 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;
9) Robust digital mobile broadcasting transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) Robust digital mobile broadcasting transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
11) radiofrequency signal that Robust digital mobile broadcasting receiver detection reception Robust digital mobile broadcasting transmitter sends also forms baseband signal by its down-conversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal.
According to above-mentioned Robust digital mobile broadcast signal transmitting method, it is characterized in that: Robust digital mobile broadcasting 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 digital mobile broadcasting transmitter 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 Robust digital mobile broadcasting transmitter signal frame is 1/16 of the cascade interweaved coding modulation data block length of FFT K; The operational indicator sequence of Robust digital mobile broadcasting transmitter has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of Robust digital mobile broadcasting transmitter is comprising and unique each system parameters and business model information of expressing digital mobile broadcast signal transmission machine; The cascade interweaved coding modulation data piece of FFT of Robust digital mobile broadcasting transmitter is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in l/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, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, 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.Robust digital mobile broadcasting receiver can make full use of the architectural characteristic of training sequence characteristic and signal frame and carry out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis processing to signal frame head and signal frame body.
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 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 Robust digital mobile broadcasting 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 digital mobile broadcasting transmitter, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that Robust digital mobile broadcasting 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 Robust digital mobile broadcasting transmitter is comprising and unique each system parameters and business model information of expressing digital mobile broadcast signal transmission machine, can make Digital Television digital 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.Transmission method 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 digital mobile broadcasting transmitting.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of signal transmission between certain transmitter and receiver of Robust digital mobile broadcast signal transmitting method of the present invention.
Fig. 2 is the embodiment schematic diagram forming according to signal frame in signals transmission between certain transmitter and receiver of Robust digital mobile broadcast signal transmitting method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The embodiment schematic diagram of signal transmission between certain transmitter and receiver of the Robust digital mobile broadcast signal transmitting method proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) this certain Robust digital mobile broadcasting transmitter converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow;
2) this certain Robust digital mobile broadcasting transmitter is flowed through the input data bit of oneself after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation 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; Bit Interleave adopts random interleaving mode; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, 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.
3) this certain Robust digital mobile broadcasting 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];
4) Robust digital mobile broadcasting 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];
5) Robust digital mobile broadcasting 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
generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is
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
* veryexpression is to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
verythe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains; D
* evenexpression is to the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) Robust digital mobile broadcasting 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 digital mobile broadcasting 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;
7) Robust digital mobile broadcasting 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;
8) Robust digital mobile broadcasting 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;
9) Robust digital mobile broadcasting transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) this certain Robust digital mobile broadcasting transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
11) radiofrequency signal that this certain Robust digital mobile broadcasting receiver detection reception Robust digital mobile broadcasting transmitter sends also forms baseband signal by its down-conversion, the architectural characteristic of utilizing training sequence to sew characteristic and signal frame is carried out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis processing to signal frame head and signal frame body.
The embodiment schematic diagram forming according to signal frame in signals transmission between certain transmitter and receiver of Robust digital mobile broadcast signal transmitting method of the present invention, as shown in Figure 2, is specifically implemented as follows:
This certain Robust digital mobile broadcasting transmitter converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow.
This certain Robust digital mobile broadcasting transmitter is by the input data bit of oneself Bose-Chaudhuri-Hocquenghem Code of flowing through, Bit Interleave, multi code Rate of Chinese character is deleted remaining convolutional encoding, code element modulation 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 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.The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, 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 Robust digital mobile broadcasting transmitter is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
The training sequence of this certain Robust digital mobile broadcasting transmitter 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.
This certain Robust digital mobile broadcasting 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 digital mobile broadcasting transmitter has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of this certain Robust digital mobile broadcasting transmitter is comprising and unique each system parameters and business model information of expressing Robust digital mobile broadcasting transmitter.
The time domain of this certain Robust digital mobile broadcasting 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 digital mobile broadcasting 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 digital mobile broadcasting 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 digital mobile broadcasting transmitter signal frame is 1/16 of FFT data block length K.
This certain digital mobile broadcast signal transmission machine adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
This certain Robust digital mobile broadcasting transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave.
The radiofrequency signal that this certain Robust digital mobile broadcasting receiver detection reception Robust digital mobile broadcasting transmitter sends also forms baseband signal by its down-conversion, utilize the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis processing to signal frame head and signal frame body.
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 digital mobile broadcast signal transmitting method, is characterized in that it comprises the following steps:
1) Robust digital mobile broadcasting transmitter converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow;
2) Robust digital mobile broadcasting transmitter is flowed through the input data bit of oneself after Bose-Chaudhuri-Hocquenghem Code, Bit Interleave, multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation and code element rotation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, BCH represents Bose Chaudhuri Hocquenghem, the length of the cascade interweaved coding modulation data piece of FFT is K, and the numerical value of K is got even number;
3) Robust digital mobile broadcasting 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];
4) Robust digital mobile broadcasting 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];
5) Robust digital mobile broadcasting 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
generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is
generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is
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
* veryexpression is to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
verythe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains; D
* evenexpression is to the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) Robust digital mobile broadcasting 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 digital mobile broadcasting 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;
7) Robust digital mobile broadcasting 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;
8) Robust digital mobile broadcasting 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;
9) Robust digital mobile broadcasting transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) Robust digital mobile broadcasting transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
11) radiofrequency signal that Robust digital mobile broadcasting receiver detection reception Robust digital mobile broadcasting transmitter sends also forms baseband signal by its down-conversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal.
2. by the Robust digital mobile broadcast signal transmitting 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 Robust digital mobile broadcast signal transmitting method of claim 1, it is characterized in that: described C gets 1/16 of K; Described G gets 1/8 of L; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Bit Interleave adopts random interleaving mode; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, 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 Robust digital mobile broadcast signal transmitting method of claim 1, it is characterized in that: described operational indicator sequence has pseudo-random characteristics, by one group of Phase shift m sequence, realized.
5. by the Robust digital mobile broadcast signal transmitting method of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
6. by the Robust digital mobile broadcast signal transmitting method of claim 1, it is characterized in that: the baseband signal reception & disposal that described Robust digital mobile broadcasting receiver carries out, one of them step is the time domain and frequency domain combined alternate analysis processing of signal frame head and signal frame body.
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