CN103780554A - Transmission method of anti-noise digital wireless broadcasting signals - Google Patents
Transmission method of anti-noise digital wireless broadcasting signals Download PDFInfo
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- CN103780554A CN103780554A CN201410024040.XA CN201410024040A CN103780554A CN 103780554 A CN103780554 A CN 103780554A CN 201410024040 A CN201410024040 A CN 201410024040A CN 103780554 A CN103780554 A CN 103780554A
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Abstract
The invention discloses a transmission method of anti-noise digital wireless broadcasting signals. The transmission method is a framing modulation scheme with time domains and frequency domains being mixed. By means of the cascading interleaving coded modulation, the training sequence optimization design, the signal generating models and a signal selection method of the transmission method of the anti-noise digital wireless broadcasting signals, original signals of OFDM signals can be easily processed at a receiver end through processing and restoring, and the transmission method has the advantages of being low in PAPR, short in synchronous time, channel fading resistant, 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-noise digital wireless broadcast signal transmission method.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital Television digital radio broadcast transmission system, as the important component part of Digital Television digital radio 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 digital radio 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 antinoise digital radio broadcast correlation technique, the emphasis that various countries pay close attention to is at present that the Digital Television antinoise digital radio broadcast how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Antinoise digital radio broadcast signal transmitter framing modulation technique is the key technology of Digital Television antinoise digital radio broadcast 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, wideband wireless local area network, Digital Television antinoise digital radio broadcast.
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.
The modulation of channel bit interweaving encoding 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 bit interweaving encoding modulation technique.In information sequence, embed redundancy symbol, channel bit interweaving encoding modulation technique 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 Bit Interleave coded modulation is that one can make message transmission rate approach theoretical maximum, i.e. the Bit Interleave coded modulation scheme of shannon limit.
In practical communication environment, Digital Television digital radio broadcast communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Antinoise digital radio broadcast signal transmitter transmission method is the key technology that realizes reliable digit TV antinoise digital radio broadcast.
Utilizing Digital Television digital radio 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 Television Digital radio 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 digital wireless broadcast signal transmission method just, can meet High Data Rate and can control the needs that multi-service Digital Television antinoise digital radio broadcast is transmitted.
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?andEmerging?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.
Z.Li，L.Chen，L.Zeng，S.Lin，W.Fong，“Efficient?encoding?of?quasi-cyclic?low-density?parity-check?codes，”IEEE?Trans.Commun.，vol.54，no.1，pp.71-81，Jan.2006.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service Digital Television antinoise digital radio broadcast problem, proposed a kind of anti-noise digital wireless broadcast signal transmission method.
A kind of anti-noise digital wireless broadcast signal transmission method that the present invention proposes, is characterized in that it comprises the following steps:
1) antinoise digital radio 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) antinoise digital radio broadcast signal transmitter is flowed through the input data bit of oneself after LDPC coding, Bit Interleave, code element modulation and on frequency domain, is formed FFT Bit Interleave coding modulation data piece, LDPC represents low-density checksum, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number;
3) antinoise digital radio 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) antinoise digital radio broadcast signal transmitter separates successively and generates the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation data sample value in order
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) antinoise digital radio 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
relatively 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
* veryrepresent 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
* evenrepresent 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) antinoise digital radio broadcast signal transmitter Insert service index series after training sequence forms time domain and embeds 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 digital radio 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) antinoise digital radio 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) antinoise digital radio 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) antinoise digital radio broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) antinoise digital radio 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 antinoise digital radio broadcast signal receiver detection reception antinoise digital radio broadcast signal transmitter 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-noise digital wireless broadcast signal transmission method, it is characterized in that:
Antinoise digital radio 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 separate successively the strange sub-block of time domain discrete Bit Interleave coding modulation data sample value of generation and the even sub-block of time domain discrete Bit Interleave coding modulation data sample value according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation 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 antinoise digital radio broadcast signal transmitter is made up of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8; The circulating prefix-length C of antinoise digital radio broadcast signal transmitter signal frame is 1/16 of FFT Bit Interleave coding modulation data block length K; The operational indicator sequence of antinoise digital radio broadcast signal transmitter has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of antinoise digital radio broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing antinoise digital radio broadcast signal transmitter; The FFT Bit Interleave coding modulation data piece of antinoise digital radio broadcast signal transmitter is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate that input data is carried out to the LDPC coding of LDPC coding, Bit Interleave, code element modulation treatment is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to the one in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping.Antinoise digital radio 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 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 Bit Interleave coding modulation data sample value piece demultiplexing of the present invention also separates successively and 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, 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 (or imaginary part) of the ofdm signal in the time that number of sub carrier wave is larger is multiple Gaussian random process and whose amplitude obeys 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 antinoise digital radio 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 antinoise digital radio broadcast signal transmitter, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that antinoise digital radio 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 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.Adopt BICM to carry out Bit Interleave coded modulation to input data and improved diversity order, the bit error performance that communication system has been had under multidiameter fading channel.Each different operational indicator sequence of antinoise digital radio broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing antinoise digital radio broadcast signal transmitter, can make Digital Television digital radio broadcast transmission system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Transmission method of the present invention has low peak-to-average power ratio, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide High Data Rate can control the plurality of advantages such as multi-service Digital Television digital radio 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 digital wireless 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-noise digital wireless 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-noise digital wireless broadcast signal transmission method proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) this certain antinoise digital radio 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 antinoise digital radio broadcast signal transmitter is flowed through the input data bit of oneself after LDPC coding, Bit Interleave, code element modulation and on frequency domain, is formed FFT Bit Interleave coding modulation data piece, LDPC represents low-density checksum, 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 input data is carried out to the LDPC coding of LDPC coding, Bit Interleave, code element modulation treatment is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to the one in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping;
3) this certain antinoise digital radio 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 antinoise digital radio broadcast signal transmitter separates successively and generates the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation data sample value in order
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 antinoise digital radio 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
relatively 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
* veryrepresent 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
* evenrepresent 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 antinoise digital radio 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 digital radio 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 antinoise digital radio 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 antinoise digital radio 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 antinoise digital radio broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) this certain antinoise digital radio broadcast signal transmitter forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that this certain antinoise digital radio broadcast signal receiver detection reception antinoise digital radio 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 digital wireless broadcast signal transmission method of the present invention, as shown in Figure 2, is specifically implemented as follows:
This certain antinoise digital radio 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.
The input data bit of oneself the LDPC Bit Interleave coded modulation of flowing through on frequency domain, is formed FFT Bit Interleave coding modulation data piece by this certain antinoise digital radio broadcast signal transmitter, be transformed to again the discrete bits interweaving encoding modulating data sample value piece of time domain through IFFT, generate and 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 corresponding institute employing is sent to operational indicator sequence setting unit simultaneously by peak-to-average power ratio adjustment unit.The encoding rate that this certain antinoise digital radio broadcast signal transmitter carries out the LDPC coding of LDPC coding, Bit Interleave, code element modulation treatment to input data is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to the one in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping.
The FFT Bit Interleave coding modulation data piece of this certain antinoise digital radio broadcast signal transmitter is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
The training sequence of this certain antinoise digital radio broadcast signal transmitter is made up of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8.
This certain antinoise digital radio 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 antinoise digital radio broadcast signal transmitter has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of this certain antinoise digital radio broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing antinoise digital radio broadcast signal transmitter.
The time domain of this certain antinoise digital radio 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 antinoise digital radio 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 data sample block, as frame; This certain antinoise digital radio 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 antinoise digital radio broadcast signal transmitter signal frame is 1/16 of FFT data block length K.
This certain antinoise digital radio broadcast signal transmitter adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
This certain antinoise digital radio 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 antinoise digital radio broadcast signal receiver detection reception wireless digital broadcasting 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 digital wireless broadcast signal transmission method, is characterized in that it comprises the following steps:
1) antinoise digital radio 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) antinoise digital radio broadcast signal transmitter is flowed through the input data bit of oneself after LDPC coding, Bit Interleave, code element modulation and on frequency domain, is formed FFT Bit Interleave coding modulation data piece, LDPC represents low-density checksum, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number;
3) antinoise digital radio 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) antinoise digital radio broadcast signal transmitter separates successively and generates the strange sub-block D of time domain discrete Bit Interleave coding modulation data sample value by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing and according to the sequencing odd even of each time domain discrete Bit Interleave coding modulation data sample value in order
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) antinoise digital radio 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
relatively 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
* veryrepresent 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
* evenrepresent 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) antinoise digital radio broadcast signal transmitter Insert service index series after training sequence forms time domain and embeds 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 digital radio 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) antinoise digital radio 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) antinoise digital radio 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) antinoise digital radio broadcast signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) antinoise digital radio 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 antinoise digital radio broadcast signal receiver detection reception antinoise digital radio broadcast signal transmitter 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-noise digital wireless broadcast signal transmission method of claim 1, it is characterized in that: described training sequence is made up of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, B has identical symbol lengths L with A.
3. by the anti-noise digital wireless 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 described encoding rate that carries out the LDPC coding of LDPC coding, Bit Interleave, code element modulation treatment to inputting data is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to the one in QPSK, 16QAM, 32QAM, 64QAM, 64APSK, 256APSK, 1024APSK, and symbol constellations figure mapping mode adopts Gray code mapping.
4. by the anti-noise digital wireless broadcast signal transmission method of claim 1, it is characterized in that: described operational indicator sequence has pseudo-random characteristics, realized by one group of Phase shift m sequence.
5. by the anti-noise digital wireless broadcast signal transmission method of claim 1, it is characterized in that: described FFT data block is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
6. by the anti-noise digital wireless broadcast signal transmission method of claim 1, it is characterized in that: the baseband signal reception & disposal that described antinoise digital radio 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.
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