CN103763260A - Anti-noise wireless digital radio signal transmission method - Google Patents
Anti-noise wireless digital radio signal transmission method Download PDFInfo
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- CN103763260A CN103763260A CN201410022906.3A CN201410022906A CN103763260A CN 103763260 A CN103763260 A CN 103763260A CN 201410022906 A CN201410022906 A CN 201410022906A CN 103763260 A CN103763260 A CN 103763260A
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Abstract
The invention discloses an anti-noise wireless digital radio signal transmission method and relates to a hybrid framing modulation scheme of the time domain and the frequency domain. Due to the training sequence optimization design, the signal generating scheme and the signal selection method of the anti-noise wireless digital radio signal transmission method, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals, and the method has the advantages of being low in peak average power rate, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-noise method for transmitting wireless digital broadcast signal.
Background technology
At present, television broadcasting is own from simulating gradually to digitlization future development.Digital Television wireless digital broadcasting transmission system, as the important component part of Digital Television wireless digital 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 wireless digital 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 anti-noise wireless digital broadcasting correlation technique, the emphasis that various countries pay close attention to is at present that the Digital Television anti-noise wireless digital broadcasting how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Anti-noise wireless digital broadcast signal transmitter transmission technology is the key technology of Digital Television anti-noise wireless digit broadcasting system, for whole system performance, plays conclusive effect, is the object of everybody primary study.
Due to the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes and becomes more and more easier.Because OFDM Multicarrier Transmission Technology has simple in structure, the availability of frequency spectrum is high, the plurality of advantages such as in the time of can resisting frequency selectivity and channel, becomes and extremely everybody concern obtain deep research and the extensive use in the numerous areas such as Xdsl, wide-band mobile communication, wideband wireless local area network, the digital broadcasting of Digital Television anti-noise wireless.
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.
Chnnel coding is the important component part of digital communication system.Along with the develop rapidly of modern information technologies, oneself becomes the indispensable technology in modern communications field channel coding technology.In information sequence, embed redundancy symbol, channel coding technology reduces signal by the effect of redundancy symbol and makes a mistake in transmitting procedure, thereby improves the reliability of communication system.Low-density checksum (Low Density Parity Check, LDPC) code is a kind of at noise transmission channel transmission information and carry out the error correcting code of forward error correction (FEC, Forward Error Correction).LDPC coding is that one can make message transmission rate approach theoretical maximum, i.e. the encoding scheme of shannon limit.
In practical communication environment, Digital Television wireless digital broadcasting communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Anti-noise wireless digital broadcast signal transmitter transmission method is the key technology that realizes the digital broadcasting of reliable digit TV anti-noise wireless.
Utilizing Digital Television wireless digital broadcasting 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 wireless digital broadcasting transmission system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of anti-noise method for transmitting wireless digital broadcast signal just, can meet High Data Rate and can control the needs of multi-service Digital Television anti-noise wireless digital broadcast transmission.
Wish is done more deep understanding to patent background can be with reference to following documents and materials:
R.V.Nee，R.Prasad.“OFDM?for?wireless?mul?timedia?communica?tions”.Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digital?television?development，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?andEmerging?Services，pp.8-21，Jan.2006.M.S.Richer，G.Reitmeier，T.Gurley，G.A.Jones，J.Whitaker，and?R.Rast.“The?ATSC?digital?television?system，”Proceedings?of?the?IEEESpecial?Issue?onGlobal?Digi?tal?Tele?vision：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?mobi?le?use，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?andEmergingServices，pp.183-194，Jan.2006.
M.Takada?and?M.Sai?to.“Transmi?ssion?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digi?talTele?vision：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-noise wireless digital broadcasting problem, proposed a kind of anti-noise method for transmitting wireless digital broadcast signal.
A kind of anti-noise method for transmitting wireless digital broadcast signal that the present invention proposes, is characterized in that it comprises the following steps:
1) anti-noise wireless 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-noise wireless digital broadcast signal transmitter is coded in the input data bit of oneself LDPC that flows through on frequency domain and forms FFT coded data block, and LDPC represents low-density checksum, and the length of FFT coded data block is K, and the numerical value of K is got even number;
3) anti-noise wireless digital broadcast signal transmitter adopts IFFT that FFT coded data block is transformed to time domain discrete coded data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
4) anti-noise wireless digital broadcast signal transmitter separates successively and generates the strange sub-block D of time domain discrete coded data sample value by time domain discrete coded data sample value piece demultiplexing and according to the sequencing odd even of each time domain discrete coded data sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete coded data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
5) anti-noise wireless digital broadcast signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete coded data sample value
very, the even sub-block D of time domain discrete coded data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete coded data sample value piece D again
new, new time domain discrete coded 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
relatively 18 kinds of time domain discrete coded 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 coded data sample value piece falls
and peak-to-average power ratio time domain discrete coded 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 coded data sample value
veryeach time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value sub-block that obtains; D
* evenexpression is to the even sub-block D of time domain discrete coded data sample value
eveneach time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value sub-block that obtains;
6) anti-noise wireless 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-noise wireless digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete coded data sample value piece of training sequence discrete sample block;
7) anti-noise wireless digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete coded 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 coded data sample value piece, as frame;
8) anti-noise wireless 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 coded data sample value piece be frame using Cyclic Prefix as protection interval, and to form signal frame, the length of Cyclic Prefix is C;
9) anti-noise wireless digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) anti-noise wireless 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-noise wireless digital broadcasting signal receiver detection reception anti-noise wireless 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.
According to above-mentioned anti-noise method for transmitting wireless digital broadcast signal, it is characterized in that: anti-noise wireless digital broadcast signal transmitter peak-to-average power ratio time domain discrete coded data sample value piece falls by time domain discrete coded data sample value piece demultiplexing and separate successively the strange sub-block of time domain discrete coded data sample value of generation and the even sub-block of time domain discrete coded data sample value according to the sequencing odd even of each time domain discrete coded data sample value and carry out signal power adjustment and corresponding signal and process and pass through 18 kinds of generate patterns of particular design and again synthesize; The training sequence of anti-noise wireless digital broadcast signal transmitter is comprised of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8; The circulating prefix-length C of anti-noise wireless digital broadcast signal transmitter signal frame is 1/16 of FFT coded data block length K; The operational indicator sequence of anti-noise wireless 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-noise wireless digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing anti-noise wireless digital broadcast signal transmitter; The FFT coded data block of anti-noise wireless digital broadcast signal transmitter is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.Anti-noise wireless digital broadcasting 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 processing to signal frame head and signal frame body.
Feature of the present invention:
The present invention is the framing modulation scheme that a kind of time-domain and frequency-domain mixes.Time domain discrete coded data sample value piece demultiplexing of the present invention also separates successively and generates the time domain discrete strange sub-block of coded data sample value and the even sub-block of time domain discrete coded 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 coded data sample value, what by particular design 18 kinds fell the generate pattern of peak-to-average power ratio time domain discrete coded data sample value piece and had a minimum peak-to-average power ratio falls peak-to-average power ratio time domain discrete coded 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 (or imaginary part) of the ofdm signal when number of sub carrier wave is larger is multiple Gaussian random process and whose amplitude obeys Rayleigh distribution and then low complex degree ground effectively change over frame signal reaches the object that reduces peak-to-average power ratio, the amount of information of the required extra transmission of generate pattern adopting is little, be easy to process at receiver end the primary signal of recovering to obtain ofdm signal, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.Training sequence in the signal frame of anti-noise wireless 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 coded data sample value piece that peak-to-average power ratio time domain discrete coded data sample value piece falls in the time domain embedding training sequence of anti-noise wireless digital broadcast signal transmitter, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that anti-noise wireless digital broadcasting 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 coded data sample value piece to form signal frame, can reduce the interference effect between adjacent signals frame.Adopt LDPC coding to carry out chnnel coding to input data the error-correcting performance that approaches shannon limit is provided.Each different operational indicator sequence of anti-noise wireless digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing anti-noise wireless digital broadcast signal transmitter, can make Digital Television anti-noise wireless digital broadcasting 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-noise wireless 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-noise method for transmitting wireless digital broadcast signal 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-noise method for transmitting wireless digital broadcast signal 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-noise method for transmitting wireless digital broadcast signal proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) this certain anti-noise wireless 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-noise wireless digital broadcast signal transmitter is coded in the input data bit of oneself LDPC that flows through on frequency domain and forms FFT coded data block, and LDPC represents low-density checksum, and the length of FFT coded data block is K, and the numerical value of K is got even number; The encoding rate that input data is carried out to LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8;
3) this certain anti-noise wireless digital broadcast signal transmitter adopts IFFT that FFT coded data block is transformed to time domain discrete coded data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
4) this certain anti-noise wireless digital broadcast signal transmitter separates successively and generates the strange sub-block D of time domain discrete coded data sample value by time domain discrete coded data sample value piece demultiplexing and according to the sequencing odd even of each time domain discrete coded data sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete coded data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
5) this certain anti-noise wireless digital broadcast signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete coded data sample value
very, the even sub-block D of time domain discrete coded data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete coded data sample value piece D again
new, new time domain discrete coded 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
relatively 18 kinds of time domain discrete coded 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 coded data sample value piece falls
and peak-to-average power ratio time domain discrete coded 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 coded data sample value
veryeach time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value sub-block that obtains; D
*even expression the even sub-block D of time domain discrete coded data sample value
eveneach time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value sub-block that obtains;
6) this certain anti-noise wireless 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-noise wireless digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete coded data sample value piece of training sequence discrete sample block;
7) this certain anti-noise wireless digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete coded 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 coded data sample value piece, as frame;
8) this certain anti-noise wireless 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 coded 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-noise wireless digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) this certain anti-noise wireless 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-noise wireless digital broadcasting signal receiver detection reception anti-noise wireless 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 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-noise method for transmitting wireless digital broadcast signal of the present invention, as shown in Figure 2, is specifically implemented as follows:
This certain anti-noise wireless 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-noise wireless digital broadcast signal transmitter is coded in the input data bit of oneself LDPC that flows through on frequency domain, to form FFT coded data block, LDPC represents low-density checksum, through IFFT, be transformed to again the discrete coded data sample value piece of time domain, by peak-to-average power ratio adjustment unit, generate and choose the peak-to-average power ratio time domain discrete coded data sample value piece that falls wherein with minimum peak-to-average power ratio and the generate pattern information of corresponding institute employing is sent to operational indicator sequence setting unit simultaneously.
The FFT coded data block of this certain anti-noise wireless digital broadcast signal transmitter is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate that input data is carried out to LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8.
The training sequence of this certain anti-noise wireless digital broadcast signal transmitter is comprised of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8.
This certain anti-noise wireless 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-noise wireless 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-noise wireless digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing anti-noise wireless digital broadcast signal transmitter.
The time domain of this certain anti-noise wireless digital broadcast signal transmitter embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete coded data sample value piece of training sequence discrete sample block; This certain anti-noise wireless digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete coded 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 coded data sample value piece, as frame; This certain anti-noise wireless 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 coded data sample value piece be frame using Cyclic Prefix as protection interval, and to form signal frame, the length of Cyclic Prefix is C; The circulating prefix-length C of this certain anti-noise wireless digital broadcast signal transmitter signal frame is 1/16 of FFT coded data block length K.
This certain anti-noise wireless digital broadcast signal transmitter adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
This certain anti-noise wireless 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-noise wireless digital broadcasting signal receiver detection reception anti-noise wireless 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 processing to signal frame head and signal frame body.
By reference to the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to above-described embodiment, in the spirit and scope situation of claim that does not depart from the application, those skilled in the art can make various modifications or remodeling.
Claims (6)
1. an anti-noise method for transmitting wireless digital broadcast signal, is characterized in that it comprises the following steps:
1) anti-noise wireless 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-noise wireless digital broadcast signal transmitter is coded in the input data bit of oneself LDPC that flows through on frequency domain and forms FFT coded data block, and LDPC represents low-density checksum, and the length of FFT coded data block is K, and the numerical value of K is got even number;
3) anti-noise wireless digital broadcast signal transmitter adopts IFFT that FFT coded data block is transformed to time domain discrete coded data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
4) anti-noise wireless digital broadcast signal transmitter separates successively and generates the strange sub-block D of time domain discrete coded data sample value by time domain discrete coded data sample value piece demultiplexing and according to the sequencing odd even of each time domain discrete coded data sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete coded data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
5) anti-noise wireless digital broadcast signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete coded data sample value
very, the even sub-block D of time domain discrete coded data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete coded data sample value piece D again
new, new time domain discrete coded 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
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
relatively 18 kinds of time domain discrete coded 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 coded data sample value piece falls
and peak-to-average power ratio time domain discrete coded 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 coded data sample value
veryeach time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value sub-block that obtains; D
* evenexpression is to the even sub-block D of time domain discrete coded data sample value
eveneach time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value sub-block that obtains;
6) anti-noise wireless 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-noise wireless digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete coded data sample value piece of training sequence discrete sample block;
7) anti-noise wireless digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete coded 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 coded data sample value piece, as frame;
8) anti-noise wireless 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 coded data sample value piece be frame using Cyclic Prefix as protection interval, and to form signal frame, the length of Cyclic Prefix is C;
9) anti-noise wireless digital broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) anti-noise wireless 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-noise wireless digital broadcasting signal receiver detection reception anti-noise wireless 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-noise method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: described training sequence is comprised of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*expression is carried out conjugate operation processing, A to each symbol of B
*expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A.
3. by the anti-noise method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: described C gets 1/16 of K; Described G gets 1/8 of L.
4. by the anti-noise method for transmitting wireless digital broadcast signal 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-noise method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: described FFT coded data block is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The described encoding rate that carries out LDPC coding to inputting data is in 1/4,1/2,5/8,3/4 and 7/8.
6. by the anti-noise method for transmitting wireless digital broadcast signal of claim 1, it is characterized in that: the baseband signal reception & disposal that described anti-noise wireless digital broadcasting 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.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| CN101420408A (en) * | 2008-10-27 | 2009-04-29 | 宁波大学 | Interference resistant modulation method for digital television terrestrial broadcast transmitter |
| US20090147870A1 (en) * | 2007-12-10 | 2009-06-11 | Mao-Chao Lin | Method for solving high papr problem of mcm communication system using unitary transform |
| CN102255855A (en) * | 2011-08-22 | 2011-11-23 | 宁波大学 | Anti-noise method for transmitting wireless digital broadcast signal |
| CN102882670A (en) * | 2012-09-13 | 2013-01-16 | 电子科技大学 | Synchronous processing method based on CMMB signals |
-
2014
- 2014-01-13 CN CN201410022906.3A patent/CN103763260A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| US20090147870A1 (en) * | 2007-12-10 | 2009-06-11 | Mao-Chao Lin | Method for solving high papr problem of mcm communication system using unitary transform |
| CN101420408A (en) * | 2008-10-27 | 2009-04-29 | 宁波大学 | Interference resistant modulation method for digital television terrestrial broadcast transmitter |
| CN102255855A (en) * | 2011-08-22 | 2011-11-23 | 宁波大学 | Anti-noise method for transmitting wireless digital broadcast signal |
| CN102882670A (en) * | 2012-09-13 | 2013-01-16 | 电子科技大学 | Synchronous processing method based on CMMB signals |
Non-Patent Citations (1)
| Title |
|---|
| 海妍妮: "OFDM系统中峰平比问题的研究", 《中国优秀硕士学位论文全文数据库》 * |
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