CN102255859B - Anti-fading digital mobile broadcast signal transmission method - Google Patents
Anti-fading digital mobile broadcast signal transmission method Download PDFInfo
- Publication number
- CN102255859B CN102255859B CN201110250188.1A CN201110250188A CN102255859B CN 102255859 B CN102255859 B CN 102255859B CN 201110250188 A CN201110250188 A CN 201110250188A CN 102255859 B CN102255859 B CN 102255859B
- Authority
- CN
- China
- Prior art keywords
- time domain
- mobile broadcast
- digital mobile
- broadcast signal
- signal transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005562 fading Methods 0.000 title claims abstract description 102
- 230000008054 signal transmission Effects 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012549 training Methods 0.000 claims description 64
- 125000004122 cyclic group Chemical group 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000013507 mapping Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Abstract
The invention discloses an anti-fading digital mobile broadcast signal transmission method which is a time domain frequency domain mixed transmission scheme. The anti-fading digital mobile broadcast signal transmission method of the present invention has the advantages of low peak-to-average power ratio, short synchronization time, fading resistance, control of multiple services and the like.
Description
Technical field
The invention belongs to moving communicating field, relate more specifically to a kind of anti-fading digital mobile broadcast signal transmission 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.Transmission technology 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 extensive use in the numerous areas such as Xdsl, wide-band mobile communication, broadband mobile local area network (LAN), 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 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 the anti-fading digital mobile broadcast of reliable digit TV.
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 the anti-fading digital 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 digital mobile broadcast signal transmission method just, can meet High Data Rate and can control the needs of the anti-fading digital 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?multimedia?communications”.Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digital?television?development，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.8-21，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stationary?portable?and?mobile?use，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?coded?modulation，”IEEE?Trans.Information?Theory，vol.44，no.3，pp.927-946，May?1998.
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，May?1998.
Summary of the invention
The present invention is directed to High Data Rate and can control the anti-fading digital mobile broadcast issue of multi-service Digital Television, proposed a kind of anti-fading digital mobile broadcast signal transmission method.
A kind of anti-fading digital mobile broadcast signal transmission method that the present invention proposes, is characterized in that it comprises the following steps:
1) anti-fading digital mobile broadcast signal transmission machine 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) anti-fading digital mobile broadcast signal transmission machine is by the input data bit of oneself the RS coding (Reed-Solomon that flows through, RS), convolutional interleave, multi code Rate of Chinese character form the cascade interweaved coding modulation data piece of FFT after deleting remaining convolutional encoding, code element modulation and code element rotation, symbol interleave on frequency domain, FFT represents fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
3) anti-fading digital mobile broadcast signal transmission machine 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, IFFT represents fast discrete Fourier inverse transformation;
4) anti-fading digital mobile broadcast signal transmission machine is divided equally into two by cascade interweaved time domain discrete coding modulation data sample value piece in order, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1with the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2, D
total=[D
1, D
2];
5) anti-fading digital mobile broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2carry out that signal adds, subtracts, conjugate operation is processed and 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
1, D
2], 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
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
The relatively 12 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
* 1represent the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1the 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) the real part sequence of anti-fading digital mobile broadcast signal transmission machine using training sequence as sequence of plural training, the imaginary part sequence using operational indicator sequence set operational indicator sequence setting unit as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-fading digital mobile broadcast signal transmission machine;
7) anti-fading digital mobile broadcast signal transmission machine repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain for 4 times and embeds training sequence discrete sample block in time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 × X of training sequence discrete sample block;
8) anti-fading digital 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;
9) anti-fading digital 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;
10) anti-fading digital mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) anti-fading digital mobile broadcast signal transmission machine forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that the anti-fading digital mobile broadcast signal transmission machine of anti-fading digital mobile broadcast signal receiver detection reception sends also forms baseband signal by its down-conversion, utilizes the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal.
According to above-mentioned anti-fading digital mobile broadcast signal transmission method, it is characterized in that: the falling that the signal that the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece undertakies by specific 12 kinds of generate patterns by the cascade interweaved coding modulation data sample value of time domain discrete sub-block adds, subtracts, conjugate operation is processed of anti-fading digital mobile broadcast signal transmission machine and again synthetic; In the signal frame of anti-fading digital mobile broadcast signal transmission machine, there is periodic time domain and embed training sequence discrete sample block; The length X of the training sequence of anti-fading digital mobile broadcast signal transmission machine is in 512,1024,2048, the length K of the cascade interweaved coding modulation data piece of corresponding FFT is respectively 2048,4096,8192, the frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively 1/4,1/8,1/16 of the cascade interweaved coding modulation data block length of FFT K size; Training sequence, the operational indicator sequence of anti-fading digital mobile broadcast signal transmission machine form by a series of 1 or 1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of anti-fading digital mobile broadcast signal transmission machine have orthogonality each other; Each different operational indicator sequence of anti-fading digital mobile broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing anti-fading digital mobile broadcast signal transmission machine; 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 the one in QPSK, 16 QAM, 64 QAM and 256 QAM, 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 16 QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64 QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256 QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode.Anti-fading digital mobile broadcast signal receiver can make full use of the Cyclic Prefix characteristic of signal frame and the architectural characteristic of 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.
Feature of the present invention:
The present invention is the transmission plan that a kind of time-domain and frequency-domain mixes.Generate pattern of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece of the present invention and 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 choosing method falls, 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 real part (or imaginary part) of the ofdm signal in the time that number of sub carrier wave is larger is the characteristic of multiple Gaussian random process and whose amplitude obeys Rayleigh distribution, 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.In the signal frame of anti-fading digital mobile broadcast signal transmission machine, there is periodic time domain and embed training sequence discrete sample block, the training sequence of anti-fading digital mobile broadcast signal transmission machine, operational indicator sequence has pseudo-random characteristics, the training sequence of anti-fading digital mobile broadcast signal transmission machine, operational indicator sequence has orthogonality each other, 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 digital mobile broadcast signal transmission machine, time domain embeds training sequence discrete sample block and directly superposes and form, these have ensured that anti-fading digital 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.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.Code element modulation rotates with code element the diversity that mobile multimedia broadcast signal is provided.Each different operational indicator sequence of anti-fading digital mobile broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing anti-fading digital mobile broadcast signal transmission machine, can make the anti-fading digital mobile broadcast transmission system of Digital Television 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 cascade interweaving encoding modulation data rate can control the plurality of advantages such as the anti-fading digital mobile broadcasting transmitting of multi-service Digital Television.
Brief description of the drawings
Fig. 1 is according to the embodiment schematic diagram of signal transmission between certain transmitter and receiver of anti-fading digital mobile broadcast signal transmission 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 anti-fading digital mobile broadcast signal transmission 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 anti-fading digital mobile broadcast signal transmission method proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) this certain anti-fading digital mobile broadcast signal transmission machine 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 anti-fading digital 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, FFT represents fast discrete Fourier conversion, 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 the one in QPSK, 16 QAM, 64 QAM and 256 QAM, 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 16 QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64 QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256 QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode.
3) this certain anti-fading digital mobile broadcast signal transmission machine 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, IFFT represents fast discrete Fourier inverse transformation;
4) this certain anti-fading digital mobile broadcast signal transmission machine is divided equally into two by cascade interweaved time domain discrete coding modulation data sample value piece in order, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1with the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2, D
total=[D
1, D
2];
5) this certain anti-fading digital mobile broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2carry out that signal adds, subtracts, conjugate operation is processed and 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
1, D
2], 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
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
The relatively 12 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
* 1represent the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1the 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) the real part sequence of this certain anti-fading digital mobile broadcast signal transmission machine using training sequence as sequence of plural training, imaginary part sequence using operational indicator sequence set operational indicator sequence setting unit as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, training sequence, operational indicator sequence, the length of the discrete sample block of sequence of plural training is all X, operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-fading digital mobile broadcast signal transmission machine, X gets 512, 1024, in 2048 one,
7) this certain anti-fading digital mobile broadcast signal transmission machine repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain for 4 times and embeds training sequence discrete sample block in time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 × X of training sequence discrete sample block; In the time that X gets 512, K gets 2048, and the frequency interval of corresponding subcarrier is got 4KHz; In the time that X gets 1024, K gets 4096, and the frequency interval of corresponding subcarrier is got 2KHz; In the time that X gets 2048, K gets 8192, and the frequency interval of corresponding subcarrier is got 1KHz;
8) this certain anti-fading digital 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;
9) this certain anti-fading digital 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; In the time that X gets 512, C gets 1/4 of K size; In the time that X gets 1024, C gets 1/8 of K size; In the time that X gets 2048, C gets 1/16 of K size;
10) this certain anti-fading digital mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) this anti-fading certain digital mobile broadcast signal transmission machine forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that the anti-fading digital mobile broadcast signal transmission machine of this certain anti-fading digital mobile broadcast signal receiver detection reception sends also forms baseband signal by its down-conversion, utilize the Cyclic Prefix characteristic of signal frame and the architectural characteristic of 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.
The embodiment schematic diagram forming according to signal frame in signals transmission between certain transmitter and receiver of anti-fading digital mobile broadcast signal transmission method of the present invention, as shown in Figure 2, is specifically implemented as follows:
This certain anti-fading digital mobile broadcast signal transmission machine 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 anti-fading digital 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, 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 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 the one in QPSK, 16 QAM, 64 QAM and 256 QAM, 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 16 QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64 QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256 QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode.
The cascade interweaved coding modulation data piece of FFT is made up of subcarrier.The length of the cascade interweaved coding modulation data piece of FFT is K; In the time that X gets 512, corresponding K gets 2048, and the frequency interval of corresponding subcarrier is got 4KHz; In the time that X gets 1024, corresponding K gets 4096, and the frequency interval of corresponding subcarrier is got 2KHz; In the time that X gets 2048, corresponding K gets 8192, and the frequency interval of corresponding subcarrier is got 1KHz.
The real part sequence of this certain anti-fading digital mobile broadcast signal transmission machine using training sequence as sequence of plural training, the imaginary part sequence using operational indicator sequence as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, then it is repeated to form for 4 times continuously time domain embedding training sequence discrete sample block in time domain.The length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and X gets in 512,1024,2048, and the length that time domain embeds training sequence discrete sample block is K, K=4 × X.
Training sequence, operational indicator sequence as anti-fading digital mobile broadcast signal transmission machine form by a series of 1 or-1, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.The training sequence that meets above-mentioned feature can be realized by of a kind of specific type as pseudo-random number sequence group Phase shift m sequence with as walsh sequence, the Hadamard sequences of orthogonal sequence or the orthogonal sequence being produced by other modes.Each different operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-fading digital mobile broadcast signal transmission machine.
This certain anti-fading digital 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; In the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls in time domain embedding training sequence, insert Cyclic Prefix as protection interval, form signal frame.Length as the Cyclic Prefix of protecting interval is C; In the time that X gets 512, corresponding C gets 1/4 of K size; In the time that X gets 1024, corresponding C gets 1/8 of K size; In the time that X gets 2048, corresponding C gets 1/16 of K size.
This certain anti-fading digital mobile broadcast signal transmission machine adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.In the time that X gets 512, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.1; In the time that X gets 1024, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.05; In the time that X gets 2048, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.025.
This certain anti-fading digital mobile broadcast signal transmission machine forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave.
The radiofrequency signal that the anti-fading digital mobile broadcast signal transmission machine of this certain anti-fading digital mobile broadcast signal receiver detection reception sends also forms baseband signal by its down-conversion, utilize the Cyclic Prefix characteristic of signal frame and the architectural characteristic of 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 amendments or remodeling.
Claims (8)
1. an anti-fading digital mobile broadcast signal transmission method, is characterized in that it comprises the following steps:
1) anti-fading digital mobile broadcast signal transmission machine 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) anti-fading digital 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 K is taking symbol as unit;
3) anti-fading digital mobile broadcast signal transmission machine 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;
4) anti-fading digital mobile broadcast signal transmission machine is divided equally into two by cascade interweaved time domain discrete coding modulation data sample value piece in order, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1with the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2, D
total=[D
1, D
2];
5) anti-fading digital mobile broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2carry out that signal adds, subtracts, conjugate operation is processed and 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
1, D
2], 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
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
The relatively 12 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
* 1represent the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1the 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) the real part sequence of anti-fading digital mobile broadcast signal transmission machine using training sequence as sequence of plural training, the imaginary part sequence using operational indicator sequence set operational indicator sequence setting unit as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, X is taking symbol as unit, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-fading digital mobile broadcast signal transmission machine;
7) anti-fading digital mobile broadcast signal transmission machine repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain for 4 times and embeds training sequence discrete sample block in time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 × X of training sequence discrete sample block;
8) anti-fading digital 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;
9) anti-fading digital 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;
10) anti-fading digital mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) anti-fading digital mobile broadcast signal transmission machine forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that the anti-fading digital mobile broadcast signal transmission machine of anti-fading digital mobile broadcast signal receiver detection reception sends also forms baseband signal by its down-conversion, utilizes the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception & disposal.
2. by the anti-fading digital mobile broadcast signal transmission method of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described anti-fading digital mobile broadcast signal transmission machine, operational indicator sequence, sequence of plural training is got in 512 symbols, 1024 symbols, 2048 symbols.
3. by the anti-fading digital mobile broadcast signal transmission method of claim 2, it is characterized in that: described training sequence, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics.
4. by the anti-fading digital mobile broadcast signal transmission method of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the anti-fading digital mobile broadcast signal transmission method of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is made up of subcarrier; In the time that X gets 512 symbols, sub-carrier number gets 2048, and the frequency interval of subcarrier is got 4KHz; In the time that X gets 1024 symbols, sub-carrier number gets 4096, and the frequency interval of subcarrier is got 2KHz; In the time that X gets 2048 symbols, sub-carrier number gets 8192, and the frequency interval of subcarrier is got 1KHz.
6. by the anti-fading digital mobile broadcast signal transmission method of claim 1, it is characterized in that: the length C value of described Cyclic Prefix is relevant with X value; In the time that X gets 512 symbols, C gets 1/4 of K size; In the time that X gets 1024 symbols, C gets 1/8 of K size; In the time that X gets 2048 symbols, C gets 1/16 of K size.
7. by the anti-fading digital mobile broadcast signal transmission method of claim 1, it is characterized in that: the encoding rate that described 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 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.
8. by the anti-fading digital mobile broadcast signal transmission method of claim 1, it is characterized in that: the baseband signal reception & disposal that described anti-fading digital mobile broadcast signal 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110250188.1A CN102255859B (en) | 2011-08-22 | 2011-08-22 | Anti-fading digital mobile broadcast signal transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110250188.1A CN102255859B (en) | 2011-08-22 | 2011-08-22 | Anti-fading digital mobile broadcast signal transmission method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102255859A CN102255859A (en) | 2011-11-23 |
| CN102255859B true CN102255859B (en) | 2014-09-17 |
Family
ID=44982860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110250188.1A Expired - Fee Related CN102255859B (en) | 2011-08-22 | 2011-08-22 | Anti-fading digital mobile broadcast signal transmission method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102255859B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10305718B2 (en) | 2015-04-30 | 2019-05-28 | Interdigital Ce Patent Holdings | Apparatus and method for reducing peak to average power ratio in a signal |
| US10333756B2 (en) | 2015-04-30 | 2019-06-25 | Interdigital Ce Patent Holdings | Apparatus and method for reducing peak to average power ratio in a signal |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763283A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Anti-fading digital mobile radio signal transmission method |
| CN103780551A (en) * | 2014-01-13 | 2014-05-07 | 宁波大学 | Transmission method of anti-fading digital wireless broadcasting signals |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431500A (en) * | 2008-10-27 | 2009-05-13 | 宁波大学 | Modulation method for anti-fading digital television ground broadcasting transmitter |
| CN101778073A (en) * | 2010-03-03 | 2010-07-14 | 宁波大学 | Multimedia broadcast wireless signal single-frequency network anti-fading transmission method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778076B (en) * | 2010-03-03 | 2012-10-03 | 宁波大学 | Anti-fading wireless multimedia broadcasting signal transmission method |
-
2011
- 2011-08-22 CN CN201110250188.1A patent/CN102255859B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431500A (en) * | 2008-10-27 | 2009-05-13 | 宁波大学 | Modulation method for anti-fading digital television ground broadcasting transmitter |
| CN101778073A (en) * | 2010-03-03 | 2010-07-14 | 宁波大学 | Multimedia broadcast wireless signal single-frequency network anti-fading transmission method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10305718B2 (en) | 2015-04-30 | 2019-05-28 | Interdigital Ce Patent Holdings | Apparatus and method for reducing peak to average power ratio in a signal |
| US10333756B2 (en) | 2015-04-30 | 2019-06-25 | Interdigital Ce Patent Holdings | Apparatus and method for reducing peak to average power ratio in a signal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102255859A (en) | 2011-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102255862B (en) | Method for transmitting digital mobile broadcast signal | |
| CN102255859B (en) | Anti-fading digital mobile broadcast signal transmission method | |
| CN102255699B (en) | Method for framing and modulating anti-fading wireless multimedia broadcast signals | |
| CN102255860B (en) | Anti-interference digital mobile broadcasting signal transmission method | |
| CN102255861B (en) | Robust digital mobile broadcast signal transmitting method | |
| CN102271111B (en) | Anti-fading mobile multimedia broadcasting signal framing modulation method | |
| CN102255852B (en) | Anti-fading wireless digital broadcast signal transmitting method | |
| CN102271116A (en) | Anti-fading multimedia wireless broadcast signal framing modulation method | |
| CN102263736B (en) | Anti-fading digital broadcast wireless signal transmitting method | |
| CN102271117B (en) | Anti-interference multimedia wireless broadcast signal framing modulation method | |
| CN102291358B (en) | Robust multi-media mobile broadcast signal framing modulation method | |
| CN102263747B (en) | Method for transmitting robust mobile digital broadcast signals in single frequency network | |
| CN102255849B (en) | Robust method for framing and modulating wireless multimedia broadcast signal | |
| CN102281246B (en) | Anti-fading method for transmitting wireless digital broadcast signal in single frequency network | |
| CN102263752B (en) | Method for transmitting anti-fading mobile digital broadcast signal | |
| CN102255853B (en) | Robust method for transmitting wireless digital broadcast signal | |
| CN102263753B (en) | Robust mobile digital broadcast signal transmitting method | |
| CN102281239B (en) | Anti-interference multimedia mobile broadcast signal framing modulation method | |
| CN102291354B (en) | Anti-interference digital radio broadcast signal transmission method | |
| CN102281238B (en) | Anti-fading method for transmitting digital wireless broadcast signal | |
| CN102291353B (en) | Method for transmitting robust digital radio broadcast signal | |
| CN102263764B (en) | Anti-fading transmission method of digital broadcast mobile signals | |
| CN102263754B (en) | Anti-interference transmission method of mobile digital broadcast signals | |
| CN102281240B (en) | Anti-noise multimedia mobile broadcast signal framing modulation method | |
| CN102263757B (en) | Anti-fading mobile signal transmission method for digital broadcast single-frequency network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Zhijun Inventor before: Zheng Ziwei Inventor before: Xu Tiefeng Inventor before: Nie Qiuhua Inventor before: He Jiaming |
|
| CB03 | Change of inventor or designer information | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170920 Address after: 075000 No. 102, west section, building 4, highway street, lower Garden District, Zhangjiakou, Hebei Patentee after: Liu Zhijun Address before: 315211 Zhejiang Province, Ningbo Jiangbei District Fenghua Road No. 818 Patentee before: Ningbo University |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180213 Address after: 315211 Zhejiang Province, Ningbo Jiangbei District Fenghua Road No. 818 Patentee after: Ningbo University Address before: 075000 No. 102, west section, building 4, highway street, lower Garden District, Zhangjiakou, Hebei Patentee before: Liu Zhijun |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180312 Address after: 102600, room 2, building 2212, center 3, 2 Xinghua street, Daxing District, Beijing Patentee after: BEIJING YONGBO TECHNOLOGY CO.,LTD. Address before: 315211 Zhejiang Province, Ningbo Jiangbei District Fenghua Road No. 818 Patentee before: Ningbo University |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180416 Address after: 075000 No. 102, west section, building 4, highway street, lower Garden District, Zhangjiakou, Hebei Patentee after: Liu Zhijun Address before: 102600, No. 3, building 2, building 4, Paradise Road, Beijing, Daxing District, 1, unit 317 Patentee before: BEIJING ZHITOUJIA INTELLECTUAL PROPERTY OPERATION CO.,LTD. Effective date of registration: 20180416 Address after: 102600, No. 3, building 2, building 4, Paradise Road, Beijing, Daxing District, 1, unit 317 Patentee after: BEIJING ZHITOUJIA INTELLECTUAL PROPERTY OPERATION CO.,LTD. Address before: 102600, room 2, building 2212, center 3, 2 Xinghua street, Daxing District, Beijing Patentee before: BEIJING YONGBO TECHNOLOGY CO.,LTD. |
|
| TR01 | Transfer of patent right | ||
| CP02 | Change in the address of a patent holder |
Address after: 225300 29, Chun Gang Road, port area, Taizhou, Jiangsu Patentee after: Liu Zhijun Address before: 075000 No. 102 West unit 4, road street, lower Garden District, Zhangjiakou, Hebei. Patentee before: Liu Zhijun |
|
| CP02 | Change in the address of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20180822 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |