CN103780535A - Digital broadcasting mobile signal anti-fading transmission method - Google Patents
Digital broadcasting mobile signal anti-fading transmission method Download PDFInfo
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- CN103780535A CN103780535A CN201410022996.6A CN201410022996A CN103780535A CN 103780535 A CN103780535 A CN 103780535A CN 201410022996 A CN201410022996 A CN 201410022996A CN 103780535 A CN103780535 A CN 103780535A
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Abstract
The invention discloses a digital broadcasting mobile signal anti-fading transmission method which is a time domain and frequency domain mixed type framing modulation scheme. According to the training sequence optimization design, signal generation mode and signal selection method of the digital broadcasting mobile signal anti-fading transmission method of the invention, original signals of OFDM signals can be easily processed, recovered and obtained at the receiver side, so advantages, such as low peak-to-average power ratio, short synchronization time, good channel anti-fading performance, multi-service controllability etc., can be realized.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-fading transmission method of digital broadcast mobile signals.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital Television digital broadcasting wireless transmitting system, as the wireless important component part of Digital Television 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 digital broadcasting wireless-related technologies and related industry thereof are that in Communications And Computer field, development is very fast, the industry of good market prospect.In Digital Television digital broadcasting wireless-related technologies, the emphasis that various countries pay close attention to is at present, how to be the wireless implementation of reliable high-speed mobile cheaply that provides of the Digital Television digital broadcasting under complex wave biography environment.The anti-fading transmitter framing of digital broadcast mobile signals modulation technique is the key technology of Digital Television digital broadcasting wireless 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 Xdsl, wide-band mobile communication, wideband wireless local area network, the numerous areas such as Digital Television digital broadcasting is 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.
In practical communication environment, Digital Television digital broadcasting performance in wireless communication systems is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.The anti-fading transmitter transmission method of digital broadcast mobile signals is the key technology that realizes reliable digit Television Digital broadcast radio.
Utilizing Digital Television digital broadcasting wireless transmitting system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, digital value-added service etc. can control multi-service is the embodiment that new-generation digital Television Digital broadcast wireless transmissions system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of anti-fading transmission method of digital broadcast mobile signals just, can meet High Data Rate and can control the needs of multi-service Digital Television digital broadcasting wireless 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?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：TechnologyandEmergingServices，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?IEEESpecial?Issue?on?Global?Digi?tal?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.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service Digital Television digital broadcasting wireless issue, proposed a kind of anti-fading transmission method of digital broadcast mobile signals.
A kind of anti-fading transmission method of digital broadcast mobile signals that the present invention proposes, is characterized in that it comprises the following steps:
1) the anti-fading transmitter of digital broadcast mobile signals 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) the anti-fading transmitter of digital broadcast mobile signals is flowed through the input data bit of oneself after RS coding, convolutional interleave, LDPC coding, code element modulation and code element rotation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, RS represents Reed-Solomon, LDPC represents Low Densi ty Pari ty Check, the length of the cascade interweaved coding modulation data piece of FFT is K, and the numerical value of K is got even number;
3) the anti-fading transmitter of digital broadcast mobile signals adopts IFFT that cascade interweaved FFT coding modulation data piece is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
total=[d
0, d
1..., d
k-2, d
k-1];
4) the anti-fading transmitter of digital broadcast mobile signals separates successively and generates the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete by cascade interweaved time domain discrete coding modulation data sample value piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete
very=[d
0, d
2..., d
k-4, d
k-
2] and the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
even=［ d
1, d
3..., d
k-3, d
k-1];
5) the anti-fading transmitter of digital broadcast mobile signals passes through peak-to-average power ratio adjustment unit to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
very, the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
evencarry out signal power adjustment and corresponding signal and process also the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
new, the cascade interweaved coding modulation data sample value of new time domain discrete piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
, generate pattern 3 is
, generate pattern 4 is
, generate pattern 5 is
, generate pattern 6 is
, generate pattern 7 is 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
, the relatively 18 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
and the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryrepresent the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
verythe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains; D
* evenrepresent the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) the anti-fading transmitter of digital broadcast mobile signals Insert service index series after training sequence forms time-domain 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 the anti-fading transmitter of digital broadcast mobile signals;
7) the anti-fading transmitter of digital broadcast mobile signals inserts Cyclic Prefix to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece as protection interval, the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C;
8) the anti-fading transmitter of digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece be frame by time-domain training sequence discrete sample block, to form signal frame;
9) the anti-fading transmitter of digital broadcast mobile signals adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) the anti-fading transmitter of digital broadcast mobile signals forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
11) radiofrequency signal that the anti-fading transmitter of the anti-fading receiver detection receiving digital broadcast movable signal of digital broadcast mobile signals 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-fading transmission method of digital broadcast mobile signals, it is characterized in that: the anti-fading transmitter of digital broadcast mobile signals the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls by the cascade interweaved coding modulation data sample value of time domain discrete piece demultiplexing and separate successively the time domain discrete strange sub-block of cascade interweaved coding modulation data sample value of generation and the even sub-block of the cascade interweaved coding modulation data sample value of time domain discrete according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete and carry out signal power adjustment and corresponding signal and process and pass through 18 kinds of generate patterns of particular design and again synthesize; The training sequence of the anti-fading transmitter of digital broadcast mobile signals 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 the anti-fading transmitter signal frame of digital broadcast mobile signals is 1/16 of the cascade interweaved coding modulation data block length of FFT K; The operational indicator sequence of the anti-fading transmitter of digital broadcast mobile signals has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of the anti-fading transmitter of digital broadcast mobile signals is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of digital broadcast mobile signals; The cascade interweaved coding modulation data piece of FFT of the anti-fading transmitter of digital broadcast mobile signals is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode.The anti-fading receiver of digital broadcast mobile signals can make full use of the architectural characteristic of training sequence characteristic and signal frame and carry out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis processing to signal frame head and signal frame body.Feature of the present invention:
The present invention is the framing modulation scheme that a kind of time-domain and frequency-domain mixes.The cascade interweaved coding modulation data sample value of time domain discrete of the present invention piece demultiplexing also separates successively and generates the time domain discrete strange sub-block of cascade interweaved coding modulation data sample value and the even sub-block of the cascade interweaved coding modulation data sample value of time domain discrete and the corresponding signal power adjustment of carrying out and signal processing according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete, what by particular design 18 kinds fell the generate pattern of the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece and had a minimum peak-to-average power ratio falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece choosing method, but the very high large peak power signal probability of the maximum peak power that not only can make full use of ofdm signal is very low, the power regularity of distribution that the characteristic that the real part (or imaginary part) of the ofdm signal 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 the anti-fading transmitter of digital broadcast mobile signals is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, the signal frame of the anti-fading transmitter of digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece be frame and forming by time-domain training sequence discrete sample block, these have guaranteed that the anti-fading receiver of digital broadcast mobile signals 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.Cyclic Prefix is inserted and falls the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece to form signal frame body as protection interval, can reduce the interference effect between signal frame head and frame data.Input data are carried out to cascade interweaved coded modulation and improved diversity order, the bit error performance that communication system has been had under multidiameter fading channel.Code element modulation rotates with code element the diversity that mobile digital broadcast signal is provided.Each different operational indicator sequence of the anti-fading transmitter of digital broadcast mobile signals is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of digital broadcast mobile signals, can make Digital Television digital broadcasting wireless transmitting system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, digital 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 broadcasting wireless transmission.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of signal transmission between certain transmitter and receiver of anti-fading transmission method of digital broadcast mobile signals of the present invention.
Fig. 2 is the embodiment schematic diagram forming according to signal frame in signals transmission between certain transmitter and receiver of anti-fading transmission method of digital broadcast mobile signals of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The embodiment schematic diagram of signal transmission between certain transmitter and receiver of the anti-fading transmission method of digital broadcast mobile signals proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) the anti-fading transmitter of this certain digital broadcast mobile signals 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) the anti-fading transmitter of this certain digital broadcast mobile signals is flowed through the input data bit of oneself after RS coding, convolutional interleave, LDPC coding, code element modulation and code element rotation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, RS represents Reed-Solomon, LDPC represents Low Density Parity Check, the length of the cascade interweaved coding modulation data piece of FFT is K, and the numerical value of K is got even number; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode; 3) the anti-fading transmitter of this certain digital broadcast mobile signals adopts IFFT that cascade interweaved FFT coding modulation data piece is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
total=[d
0, d
1..., d
k-2, d
k-1];
4) the anti-fading transmitter of this certain digital broadcast mobile signals separates successively and generates the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete by cascade interweaved time domain discrete coding modulation data sample value piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
even=[d
1, d
3..., d
k-3, d
k-1];
5) the anti-fading transmitter of this certain digital broadcast mobile signals passes through peak-to-average power ratio adjustment unit to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
very, the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
evencarry out signal power adjustment and corresponding signal and process also the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
new, the cascade interweaved coding modulation data sample value of new time domain discrete piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
, generate pattern 3 is
, generate pattern 4 is
, generate pattern 5 is
, generate pattern 6 is
, generate pattern 7 is 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
, the relatively 18 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
and the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryrepresent the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
verythe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains; D
* evenrepresent the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) the anti-fading transmitter of this certain digital broadcast mobile signals Insert service index series after training sequence forms time-domain 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 the anti-fading transmitter of digital broadcast mobile signals;
7) the anti-fading transmitter of this certain digital broadcast mobile signals inserts Cyclic Prefix to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece as protection interval, the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C;
8) the anti-fading transmitter of this certain digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece be frame by time-domain training sequence discrete sample block, to form signal frame;
9) the anti-fading transmitter of this certain digital broadcast mobile signals adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) the anti-fading transmitter of this certain digital broadcast mobile signals forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
11) radiofrequency signal that the anti-fading transmitter of the anti-fading receiver detection receiving digital broadcast movable signal of this certain digital broadcast mobile signals 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.
The embodiment schematic diagram forming according to signal frame in signals transmission between certain transmitter and receiver of anti-fading transmission method of digital broadcast mobile signals of the present invention, as shown in Figure 2, is specifically implemented as follows:
The anti-fading transmitter of this certain digital broadcast mobile signals 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 anti-fading transmitter of this certain digital broadcast mobile signals is by flow through RS coding of the input data bit of oneself, convolutional interleave, LDPC coding, code element modulation and code element rotation, after symbol interleave, on frequency domain, form the cascade interweaved coding modulation data piece of FFT, RS represents Reed-Solomon, LDPC represents Low Density Parity Check, be transformed to again the discrete cascade interweaving encoding modulating data sample value piece of time domain through IFFT, generate and choose the cascade interweaved coding modulation data sample value of the peak-to-average power ratio time domain discrete piece that falls wherein with minimum peak-to-average power ratio and the generate pattern information of corresponding institute employing is sent to operational indicator sequence setting unit simultaneously by peak-to-average power ratio adjustment unit.
The cascade interweaved coding modulation data piece of FFT of the anti-fading transmitter of this certain digital broadcast mobile signals is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode.
The training sequence of the anti-fading transmitter of this certain digital broadcast mobile signals 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 anti-fading transmitter of this certain digital broadcast mobile signals Insert service index series after training sequence forms time-domain training sequence discrete sample block in time domain.
The operational indicator sequence of the anti-fading transmitter of this certain digital broadcast mobile signals has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of the anti-fading transmitter of this certain digital broadcast mobile signals is comprising and unique each system parameters and business model information of expressing the anti-fading transmitter of digital broadcast mobile signals.
The anti-fading transmitter of this certain digital broadcast mobile signals inserts Cyclic Prefix to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece as protection interval, the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C; The anti-fading transmitter of this certain digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece be frame by time-domain training sequence discrete sample block, to form signal frame; The circulating prefix-length C of the anti-fading transmitter signal frame of this certain digital broadcast mobile signals is 1/16 of the cascade interweaved coding modulation data block length of FFT K.
The anti-fading transmitter of this certain digital broadcast mobile signals adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
The anti-fading transmitter of this certain digital broadcast mobile signals forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave.
The radiofrequency signal that the anti-fading transmitter of the anti-fading receiver detection receiving digital broadcast movable signal of this certain digital broadcast mobile signals 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-fading transmission method of digital broadcast mobile signals, is characterized in that it comprises the following steps:
1) the anti-fading transmitter of digital broadcast mobile signals 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) the anti-fading transmitter of digital broadcast mobile signals is flowed through the input data bit of oneself after RS coding, convolutional interleave, LDPC coding, code element modulation and code element rotation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, RS represents Reed-Solomon, LDPC represents Low Density Parity Check, the length of the cascade interweaved coding modulation data piece of FFT is K, and the numerical value of K is got even number;
3) the anti-fading transmitter of digital broadcast mobile signals adopts IFFT that cascade interweaved FFT coding modulation data piece is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
total=[d
0, d
1..., d
k-2, d
k-1];
4) the anti-fading transmitter of digital broadcast mobile signals separates successively and generates the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete by cascade interweaved time domain discrete coding modulation data sample value piece demultiplexing and according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each time domain discrete
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
even=[d
1, d
3..., d
k-3, d
k-1];
5) the anti-fading transmitter of digital broadcast mobile signals passes through peak-to-average power ratio adjustment unit to the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
very, the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
evencarry out signal power adjustment and corresponding signal and process also the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
new, the cascade interweaved coding modulation data sample value of new time domain discrete piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
, generate pattern 3 is
, generate pattern 4 is
, generate pattern 5 is
, generate pattern 6 is
, generate pattern 7 is 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
, the relatively 18 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
, and the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
*very represent the strange sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
verythe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains; D
*even expression the even sub-block D of the cascade interweaved coding modulation data sample value of time domain discrete
eventhe cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
6) the anti-fading transmitter of digital broadcast mobile signals Insert service index series after training sequence forms time-domain 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 the anti-fading transmitter of digital broadcast mobile signals;
7) the anti-fading transmitter of digital broadcast mobile signals inserts Cyclic Prefix to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece as protection interval, the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece falls in formation, as frame, the length of Cyclic Prefix is C;
8) the anti-fading transmitter of digital broadcast mobile signals is that frame head is inserted into that to fall the discrete cascade interweaving encoding of peak-to-average power ratio time domain cyclic prefix modulating data sample value piece be frame by time-domain training sequence discrete sample block, to form signal frame;
9) the anti-fading transmitter of digital broadcast mobile signals adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) the anti-fading transmitter of digital broadcast mobile signals forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
11) radiofrequency signal that the anti-fading transmitter of the anti-fading receiver detection receiving digital broadcast movable signal of digital broadcast mobile signals 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-fading transmission method of digital broadcast mobile signals 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-fading transmission method of digital broadcast mobile signals 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 of LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and symbol constellations figure mapping mode adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree; Symbol interleave adopts random interleaving mode.
4. by the anti-fading transmission method of digital broadcast mobile signals 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-fading transmission method of digital broadcast mobile signals of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
6. by the anti-fading transmission method of digital broadcast mobile signals of claim 1, it is characterized in that: the baseband signal reception & disposal that the anti-fading receiver of described digital broadcast mobile signals 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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