CN103763292A - Anti-interference mobile digital broadcasting signal transmission method - Google Patents
Anti-interference mobile digital broadcasting signal transmission method Download PDFInfo
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- CN103763292A CN103763292A CN201410023999.1A CN201410023999A CN103763292A CN 103763292 A CN103763292 A CN 103763292A CN 201410023999 A CN201410023999 A CN 201410023999A CN 103763292 A CN103763292 A CN 103763292A
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Abstract
The invention discloses an anti-interference mobile digital broadcasting signal transmission method, and relates to a time domain and frequency domain mixed framing modulation scheme. Due to the training sequence optimization design, the signal generation mode and the signal selection method of the anti-interference mobile digital broadcasting signal transmission method, processing and restoring can be easily conducted at the end of a receiver so as to obtain an original signal of an OFDM signal, and the anti-interference mobile digital broadcasting signal transmission method has the advantages of being low in peak-to-average power ratio, short in synchronization time, capable of resisting channel fading, capable of controlling multiple services and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-interference mobile digital broadcast signal transmission method.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital Television anti-interference mobile digital broadcast transmission system, as the important component part of Digital Television anti-interference mobile digital broadcast, 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 anti-interference mobile digital broadcast 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 anti-interference mobile digital broadcast correlation technique, the emphasis that various countries pay close attention to is at present that the Digital Television anti-interference mobile digital broadcast how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Anti-interference mobile digital broadcast signal transmitter transmission technology is the key technology of Digital Television anti-interference mobile digital broadcast 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 anti-interference mobile digital broadcast.
The peak-to-average power ratio that ofdm signal is higher (PAPR) has very high requirement to the range of linearity of amplifier and digital to analog converter, if system linearity scope can not meet the variation of signal, can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between subchannel to be destroyed, produce phase mutual interference, make system performance degradation.Therefore the solution that, must consider how to reduce the probability of occurrence of large peak power signal in ofdm signal and reduce nonlinear distortion impact.
In practical communication environment, Digital Television anti-interference mobile digital broadcast communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Anti-interference mobile digital broadcast signal transmitter transmission method is the key technology that realizes reliable digit TV anti-interference mobile digital broadcast.
Utilizing Digital Television anti-interference mobile digital broadcast transmission system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital TV anti-interference mobile digital broadcast transmission system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of anti-interference mobile digital broadcast signal transmission method just, can meet the needs that High Data Rate can be controlled the transmission of multi-service Digital Television anti-interference mobile digital broadcast.
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.
M.S.Richer，G.Reitmeier，T.Gurley，G.A.Jones，J.Whitaker，and?R.Rast.“The?ATSC?digital?television?system，”Proceedings?of?the?IEEE,Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services,pp.37-43，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.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service Digital Television anti-interference mobile digital broadcast problem, proposed a kind of anti-interference mobile digital broadcast signal transmission method.
A kind of anti-interference mobile digital broadcast signal transmission method that the present invention proposes, is characterized in that it comprises the following steps:
1) anti-interference mobile digital broadcast signal 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) anti-interference mobile digital broadcast signal transmitter is flowed through the input data bit of oneself after multi code Rate of Chinese character is deleted remaining convolutional encoding, Bit Interleave, code element modulation and code element rotation and on frequency domain, is formed FFT Bit Interleave coding modulation data piece, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number;
3) anti-interference mobile digital broadcast signal transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
4) anti-interference mobile digital broadcast signal transmitter is by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and according to the sequencing odd even of each the time domain discrete Bit Interleave coding modulation data sample value successively separated strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value that generates
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
5) anti-interference mobile digital broadcast signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
very, the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete Bit Interleave coding modulation data sample value piece D again
new, new time domain discrete Bit Interleave coding modulation data sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
compare 18 kinds of time domain discrete Bit Interleave coding modulation data sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls
and peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryexpression is to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
veryeach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains; D
* evenexpression is to the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
eveneach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains;
6) anti-interference mobile digital broadcast signal transmitter Insert service index series after training sequence forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-interference mobile digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece of training sequence discrete sample block;
7) anti-interference mobile digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, 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 Bit Interleave coding modulation data sample value piece, as frame;
8) anti-interference mobile digital broadcast signal transmitter is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) anti-interference mobile digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) anti-interference mobile digital broadcast signal transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
11) radiofrequency signal that anti-interference mobile digital broadcast signal receiver detection reception anti-interference mobile digital broadcast signal 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.
Anti-interference mobile digital broadcast signal transmission method according to above-mentioned, is characterized in that: anti-interference mobile digital broadcast signal transmitter peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and carry out signal power adjustment and corresponding signal according to the sequencing odd even of each the time domain discrete Bit Interleave coding modulation data sample value successively separated strange sub-block of time domain discrete Bit Interleave coding modulation data sample value generating and the even sub-block of time domain discrete Bit Interleave coding modulation data sample value and process and pass through 18 kinds of generate patterns of particular design and again synthesize; The training sequence of anti-interference mobile digital broadcast signal transmitter is comprised of the first training sequence and the second training sequence; The first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix that the new sequence that produces and length thereof are G and form; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8; The circulating prefix-length C of anti-interference mobile digital broadcast signal transmitter signal frame is 1/16 of FFT Bit Interleave coding modulation data block length K; The operational indicator sequence of anti-interference mobile digital broadcast signal transmitter has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of anti-interference mobile digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing anti-interference mobile digital broadcast signal transmitter; The FFT Bit Interleave coding modulation data piece of anti-interference mobile digital broadcast signal transmitter is comprised of subcarrier, and the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz.Anti-interference mobile digital broadcast signal 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 to signal frame head and signal frame body, processes; 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 a kind of in QPSK, 16QAM, 64QAM and 256QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
Feature of the present invention:
The present invention is the framing modulation scheme that a kind of time-domain and frequency-domain mixes.Time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing of the present invention also generates the time domain discrete Bit Interleave strange sub-block of coding modulation data sample value and the even sub-block of time domain discrete Bit Interleave coding modulation data sample value and the corresponding signal power adjustment of carrying out and signal processing according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation data sample value successively separation, what by particular design 18 kinds fell the generate pattern of peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece and had a minimum peak-to-average power ratio falls peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece choosing method, but the very high large peak power signal probability of the maximum peak power that not only can make full use of ofdm signal is very low, the power regularity of distribution that the characteristic that the real part of the ofdm signal when number of sub carrier wave is larger (or imaginary part) is multiple Gaussian random process and whose amplitude obeys Rayleigh distribution and then low complex degree ground effectively change over frame signal reaches the object that reduces peak-to-average power ratio, the amount of information of the required extra transmission of generate pattern adopting is little, be easy to process at receiver end the primary signal of recovering to obtain ofdm signal, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.Training sequence in the signal frame of anti-interference mobile digital broadcast signal transmitter is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, it is by falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece that peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls in the time domain embedding training sequence of anti-interference mobile digital broadcast signal transmitter, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that anti-interference mobile digital broadcast signal receiver can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic are reliably followed the tracks of.Using Cyclic Prefix as protection interval, insert time domain embedding training sequence and fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece to form signal frame, can reduce the interference effect between adjacent signals frame.Each different operational indicator sequence of anti-interference mobile digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing anti-interference mobile digital broadcast signal transmitter, can, so that Digital Television anti-interference mobile digital 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 anti-interference mobile digital broadcast transmission.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of signal transmission between certain transmitter and receiver of anti-interference mobile digital 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-interference mobile digital 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-interference mobile digital 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-interference mobile digital broadcast signal 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 anti-interference mobile digital broadcast signal transmitter is flowed through the input data bit of oneself after multi code Rate of Chinese character is deleted remaining convolutional encoding, Bit Interleave, code element modulation and code element rotation and on frequency domain, is formed FFT Bit Interleave coding modulation data piece, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number; 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 a kind of in QPSK, 16QAM, 64QAM and 256QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree;
3) this certain anti-interference mobile digital broadcast signal transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
4) this certain anti-interference mobile digital broadcast signal transmitter is by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and according to the sequencing odd even of each the time domain discrete Bit Interleave coding modulation data sample value successively separated strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value that generates
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
5) this certain anti-interference mobile digital broadcast signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
very, the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete Bit Interleave coding modulation data sample value piece D again
new, new time domain discrete Bit Interleave coding modulation data sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
compare 18 kinds of time domain discrete Bit Interleave coding modulation data sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls
and peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryexpression is to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
veryeach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains; D
* evenexpression is to the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
eveneach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains;
6) this certain anti-interference mobile digital broadcast signal transmitter Insert service index series after training sequence forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-interference mobile digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece of training sequence discrete sample block;
7) this certain anti-interference mobile digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, 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 Bit Interleave coding modulation data sample value piece, as frame;
8) this certain anti-interference mobile digital broadcast signal transmitter is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) this certain anti-interference mobile digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) this certain anti-interference mobile digital broadcast signal 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 anti-interference mobile digital broadcast signal receiver detection reception anti-interference mobile digital broadcast signal 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 to signal frame head and signal frame body, process.
The embodiment schematic diagram forming according to signal frame in signals transmission between certain transmitter and receiver of anti-interference mobile digital broadcast signal transmission method of the present invention, as shown in Figure 2, is specifically implemented as follows:
This certain anti-interference mobile digital broadcast signal 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 anti-interference mobile digital broadcast signal transmitter is deleted remaining convolutional encoding by the input data bit of oneself multi code Rate of Chinese character of flowing through, Bit Interleave, code element modulation forms FFT Bit Interleave coding modulation data piece after rotating with code element on frequency domain, through IFFT, be transformed to again the discrete bits interweaving encoding modulating data sample value piece of time domain, by peak-to-average power ratio adjustment unit, generate and to choose the peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece that falls wherein with minimum peak-to-average power ratio and the generate pattern information of the corresponding employing of institute is sent to operational indicator sequence setting unit simultaneously.
The FFT Bit Interleave coding modulation data piece of this certain anti-interference mobile digital broadcast signal transmitter is comprised of subcarrier, and the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
The training sequence of this certain anti-interference mobile digital broadcast signal transmitter is comprised of the first training sequence and the second training sequence; The first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix that the new sequence that produces and length thereof are G and form; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8.
This certain anti-interference mobile digital broadcast signal transmitter Insert service index series after training sequence forms time domain and embeds training sequence discrete sample block in time domain.
The operational indicator sequence of this certain anti-interference mobile digital broadcast signal transmitter has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of this certain anti-interference mobile digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing anti-interference mobile digital broadcast signal transmitter.
The time domain of this certain anti-interference mobile digital broadcast signal transmitter embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece of training sequence discrete sample block; This certain anti-interference mobile digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, 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 Bit Interleave coding modulation data sample value piece, as frame; This certain anti-interference mobile digital broadcast signal transmitter is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C; The circulating prefix-length C of this certain anti-interference mobile digital broadcast signal transmitter signal frame is 1/16 of FFT Bit Interleave coding modulation data block length K.
This certain anti-interference mobile digital broadcast signal transmitter adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
This certain anti-interference mobile digital broadcast signal 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 anti-interference mobile digital broadcast signal receiver detection reception anti-interference mobile digital broadcast signal 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 to signal frame head and signal frame body, process.
By reference to the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to above-described embodiment, in the spirit and scope situation of claim that does not depart from the application, those skilled in the art can make various modifications or remodeling.
Claims (6)
1. an anti-interference mobile digital broadcast signal transmission method, is characterized in that it comprises the following steps:
1) anti-interference mobile digital broadcast signal 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) anti-interference mobile digital broadcast signal transmitter is flowed through the input data bit of oneself after multi code Rate of Chinese character is deleted remaining convolutional encoding, Bit Interleave, code element modulation and code element rotation and on frequency domain, is formed FFT Bit Interleave coding modulation data piece, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number;
3) anti-interference mobile digital broadcast signal transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
4) anti-interference mobile digital broadcast signal transmitter is by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and according to the sequencing odd even of each the time domain discrete Bit Interleave coding modulation data sample value successively separated strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value that generates
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
5) anti-interference mobile digital broadcast signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
very, the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete Bit Interleave coding modulation data sample value piece D again
new, new time domain discrete Bit Interleave coding modulation data sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
compare 18 kinds of time domain discrete Bit Interleave coding modulation data sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls
and peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryexpression is to the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value
veryeach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains; D
* evenexpression is to the even sub-block D of time domain discrete Bit Interleave coding modulation data sample value
eveneach time domain discrete Bit Interleave coding modulation data sample value carry out conjugate operation processing and the time domain discrete Bit Interleave coding modulation data sample value sub-block that obtains;
6) anti-interference mobile digital broadcast signal transmitter Insert service index series after training sequence forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-interference mobile digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece of training sequence discrete sample block;
7) anti-interference mobile digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, 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 Bit Interleave coding modulation data sample value piece, as frame;
8) anti-interference mobile digital broadcast signal transmitter is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) anti-interference mobile digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) anti-interference mobile digital broadcast signal transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
11) radiofrequency signal that anti-interference mobile digital broadcast signal receiver detection reception anti-interference mobile digital broadcast signal 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 anti-interference mobile digital broadcast signal transmission method of claim 1, it is characterized in that: described training sequence is comprised of the first training sequence and the second training sequence; The first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix that the new sequence that produces and length thereof are G and form; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A.
3. by the anti-interference mobile digital broadcast signal transmission 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 a kind of in QPSK, 16QAM, 64QAM and 256QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
4. by the anti-interference mobile digital broadcast signal transmission method of claim 1, it is characterized in that: described operational indicator sequence has pseudo-random characteristics, by one group of Phase shift m sequence, realized.
5. by the anti-interference mobile digital broadcast signal transmission method of claim 1, it is characterized in that: described FFT Bit Interleave coding modulation data piece is comprised of subcarrier, the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz.
6. by the anti-interference mobile digital broadcast signal transmission method of claim 1, it is characterized in that: the baseband signal reception & disposal that described anti-interference mobile digital broadcast signal receiver carries out, one of them step is that the time domain and frequency domain combined alternate analysis of signal frame head and signal frame body is processed.
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