CN103780567A - Single-frequency network anti-fading mobile digital broadcasting signal transmission method - Google Patents
Single-frequency network anti-fading mobile digital broadcasting signal transmission method Download PDFInfo
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Abstract
The invention discloses a single-frequency network anti-fading mobile digital broadcasting signal transmission method which is a framing modulation scheme with the space domain, the time domain and the frequency domain mixed. According to the single-frequency network anti-fading mobile digital broadcasting signal transmission method, through training sequence optimization design, signal generation modes and a signal selecting method, original signals of OFDM signals can be obtained easily at the receiver end through processing and restoring, and the method has the advantages of low peak-to-average power ratio, short synchronization time, channel fading resistance and multi-service controllability.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of anti-fading mobile digital broadcast signal transmission method for single-frequency network.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.The anti-fading mobile digital broadcast transmission system of Digital Television, as the important component part of the anti-fading mobile digital broadcast of Digital Television, 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.The anti-fading mobile digital broadcast correlation technique of Digital Television and related industry thereof are that in Communications And Computer field, development is very fast, the industry of good market prospect.In the anti-fading mobile digital broadcast correlation technique of Digital Television, the emphasis that various countries pay close attention to is at present that the anti-fading mobile digital broadcast of Digital Television how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Single-frequency network anti-fading mobile digital broadcast signal transmitter framing modulation technique is the key technology of the anti-fading mobile digital broadcast system of Digital Television, 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, the anti-fading mobile digital broadcast of Digital Television.
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.
Adopt the networking model of single frequency network can greatly improve the availability of frequency spectrum of the anti-fading mobile digital broadcast transmission system of Digital Television.In practical communication environment, the anti-fading mobile digital broadcast communication system performance of Digital Television is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Single-frequency network anti-fading mobile digital broadcast signal transmitter transmission method is the key technology that realizes the anti-fading mobile digital broadcast of reliable digit TV.
Utilizing the anti-fading mobile digital broadcast transmission system of Digital Television to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that the anti-fading mobile digital broadcast transmission system of new-generation digital TV satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of anti-fading mobile digital broadcast signal transmission method for single-frequency network just, can meet High Data Rate and can control the needs that the anti-fading mobile digital broadcast of multi-service Digital Television transmits.
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.Ladebuseh?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stationary?portable?and?mobile?use，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmi?ssion?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 the anti-fading mobile digital broadcast problem of multi-service Digital Television, proposed a kind of anti-fading mobile digital broadcast signal transmission method for single-frequency network.
A kind of anti-fading mobile digital broadcast signal transmission method for single-frequency network that the present invention proposes, is characterized in that it comprises the following steps:
1) the centre data manager of single frequency network 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 network data management device of single frequency network is flowed through input data bit 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, and LDPC represents Low Density Parity Check, and 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) to adopt code check be 1 to the network data management device of single frequency network that space-frequency coding device is modulated to cascade interweaved the FFT forming on frequency domain coding modulation data piece on each the anti-fading mobile digital broadcast signal transmitter branch road in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each anti-fading mobile digital broadcast signal transmitter branch road is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in assurance network;
4) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network adopts IFFT that cascade interweaved FFT processed empty frequency modulation coding modulation data piece is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece D
total=[d
0, d
1..., d
k-2, d
k-1];
5) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network separates successively and generates the strange sub-block D of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed by time domain discrete processed empty frequency modulation cascade interweaved 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 empty frequency modulation time domain discrete processed
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 empty frequency modulation time domain discrete processed
even=[d
1, d
3..., d
k-3, d
k-1];
6) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network 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 empty frequency modulation time domain discrete processed
very, the even sub-block D of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed
evencarry out signal power adjustment and corresponding signal and process also the synthetic new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D again
new, the new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed 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 empty frequency modulation time domain discrete processed 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 the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls
and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio 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 empty frequency modulation time domain discrete processed
verythe cascade interweaved coding modulation data sample value of each empty frequency modulation time domain discrete processed carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains; D
*even expression the even sub-block D of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed
eventhe cascade interweaved coding modulation data sample value of each empty frequency modulation time domain discrete processed carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains;
7) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network 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 single-frequency network anti-fading mobile digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece of training sequence discrete sample block;
8) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network will fall the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece, as frame;
9) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that each the anti-fading mobile digital broadcast signal transmitter in the anti-fading mobile digital broadcast signal receiver detection reception single frequency network in single frequency network 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 each method for transmitting anti-fading mobile digital broadcast signal in above-mentioned single frequency network, it is characterized in that: each the anti-fading mobile digital broadcast signal transmitter in single frequency network the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls by empty frequency modulation time domain discrete processed cascade interweaved coding modulation data sample value piece demultiplexing and separate successively the empty frequency modulation time domain discrete processed strange sub-block of cascade interweaved coding modulation data sample value of generation and the cascade interweaved coding modulation data sample value idol of empty frequency modulation time domain discrete processed sub-block according to the sequencing odd even of the cascade interweaved coding modulation data sample value of each empty frequency modulation time domain discrete processed 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 each the anti-fading mobile digital broadcast signal transmitter in single frequency network 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 each the anti-fading mobile digital broadcast signal transmitter signal frame in single frequency network is 1/16 of the cascade interweaved coding modulation data block length of FFT K; The operational indicator sequence of each the anti-fading mobile digital broadcast signal transmitter in single frequency network has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of each anti-fading mobile digital broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single-frequency network anti-fading mobile digital broadcast signal transmitter; The cascade interweaved coding modulation data piece of FFT of each the anti-fading mobile digital broadcast signal transmitter in single frequency network is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The code check of space-frequency coding device is 1; 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.
Feature of the present invention:
The present invention is the framing modulation scheme that a kind of spatial domain time-domain and frequency-domain mixes.Empty frequency modulation of the present invention time domain discrete processed cascade interweaved coding modulation data sample value piece demultiplexing also separates successively and generates the empty frequency modulation time domain discrete processed 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 empty frequency modulation time domain discrete processed 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 empty frequency modulation time domain discrete processed, what by particular design 18 kinds fell the generate pattern of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio 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 sky frequency modulation time domain discrete processed 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 each the anti-fading mobile digital broadcast signal transmitter in single frequency network is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, it is by falling the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece that the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls in the time domain embedding training sequence of each the anti-fading mobile digital broadcast signal transmitter in single frequency network, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that single-frequency network anti-fading mobile digital broadcast signal receiver can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic are reliably followed the tracks of.Insert time domain embedding training sequence using Cyclic Prefix as protection interval and fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece to form signal frame, can reduce the interference effect between adjacent signals frame.Input data are carried out to cascade interweaved coded modulation and improved diversity order, the bit error performance that communication system has been had under multidiameter fading channel.Code element modulation rotates with code element the diversity that mobile digital broadcast signal is provided.Each different operational indicator sequence of each anti-fading mobile digital broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single-frequency network anti-fading mobile digital broadcast signal transmitter, can make the anti-fading mobile digital broadcast transmission system of Digital Television can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Transmission method of the present invention has low peak-to-average power ratio, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide High Data Rate can control the plurality of advantages such as the anti-fading mobile digital broadcast transmission of multi-service Digital Television.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of the single frequency network transmitter of anti-fading mobile digital broadcast signal transmission method for single-frequency network of the present invention.
Fig. 2 is according to the embodiment schematic diagram of the single frequency network transmitter signal framing modulation of anti-fading mobile digital broadcast signal transmission method for single-frequency network of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The embodiment of the single frequency network transmitter of the anti-fading mobile digital broadcast signal transmission method for single-frequency network proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) the centre data manager of single frequency network 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 network data management device of single frequency network is flowed through input data bit 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) to adopt code check be 1 to the network data management device of single frequency network that space-frequency coding device is modulated to cascade interweaved the FFT forming on frequency domain coding modulation data piece on each the anti-fading mobile digital broadcast signal transmitter branch road in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each anti-fading mobile digital broadcast signal transmitter branch road is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in assurance network;
4) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network adopts IFFT that cascade interweaved FFT processed empty frequency modulation coding modulation data piece is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece D
total=[d
0, d
1..., d
k-2, d
k-1];
5) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network separates successively and generates the strange sub-block D of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed by time domain discrete processed empty frequency modulation cascade interweaved 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 empty frequency modulation time domain discrete processed
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 empty frequency modulation time domain discrete processed
even=[d
1, d
3..., d
k-3, d
k-1];
6) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network 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 empty frequency modulation time domain discrete processed
very, the even sub-block D of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed
evencarry out signal power adjustment and corresponding signal and process also the synthetic new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D again
new, the new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed 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 empty frequency modulation time domain discrete processed 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 the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls
and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio 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 empty frequency modulation time domain discrete processed
verythe cascade interweaved coding modulation data sample value of each empty frequency modulation time domain discrete processed carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains; D
*even expression the even sub-block D of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed
eventhe cascade interweaved coding modulation data sample value of each empty frequency modulation time domain discrete processed carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains;
7) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network 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 single-frequency network anti-fading mobile digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece of training sequence discrete sample block;
8) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network will fall the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece, as frame;
9) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that each the anti-fading mobile digital broadcast signal transmitter in the anti-fading mobile digital broadcast signal receiver detection reception single frequency network in single frequency network 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 the embodiment of the single frequency network transmitter signal framing modulation of anti-fading mobile digital broadcast signal transmission method for single-frequency network of the present invention, as shown in Figure 2, be specifically implemented as follows:
The centre data manager of single frequency network 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 network data management device of single frequency network is flowed through input data bit 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, and LDPC represents Low Density Parity Check; To adopt code check be 1, and space-frequency coding device is modulated to cascade interweaved the FFT forming on frequency domain coding modulation data piece on each the anti-fading mobile digital broadcast signal transmitter branch road in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each anti-fading mobile digital broadcast signal transmitter branch road is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in assurance network; Be transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece through IFFT again, generate and choose the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of the peak-to-average power ratio piece that falls wherein with minimum peak-to-average power ratio by peak-to-average power ratio adjustment unit and the generate pattern information of institute's correspondence employing is sent to operational indicator sequence setting unit simultaneously.
The cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is made up of subcarrier.The length of the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed is K, 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 each the anti-fading mobile digital broadcast signal transmitter in single frequency network 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.
Each anti-fading mobile digital broadcast signal transmitter Insert service index series after training sequence in single frequency network forms time domain and embeds training sequence discrete sample block in time domain.
The operational indicator sequence of each the anti-fading mobile digital broadcast signal transmitter in single frequency network has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of each anti-fading mobile digital broadcast signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single-frequency network anti-fading mobile digital broadcast signal transmitter.
The time domain of each the anti-fading mobile digital broadcast signal transmitter in single frequency network embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece of training sequence discrete sample block; Each anti-fading mobile digital broadcast signal transmitter in single frequency network will fall the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece, as frame; Each anti-fading mobile digital broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio 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 each the anti-fading mobile digital broadcast signal transmitter signal frame in single frequency network is 1/16 of the cascade interweaved coding modulation data block length of FFT K.
Each anti-fading mobile digital broadcast signal transmitter in single frequency network adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
Each anti-fading mobile digital broadcast signal transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave.
The radiofrequency signal that each anti-fading mobile digital broadcast signal transmitter in anti-fading mobile digital broadcast signal receiver detection reception single frequency network in single frequency network 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 mobile digital broadcast signal transmission method for single-frequency network, is characterized in that it comprises the following steps:
1) the centre data manager of single frequency network 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 network data management device of single frequency network is flowed through input data bit 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) to adopt code check be 1 to the network data management device of single frequency network that space-frequency coding device is modulated to cascade interweaved the FFT forming on frequency domain coding modulation data piece on each the anti-fading mobile digital broadcast signal transmitter branch road in single frequency network and forms the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed, and the time synchronized of adjusting each anti-fading mobile digital broadcast signal transmitter branch road is all processed the cascade interweaved coding modulation data piece of empty frequency modulation FFT processed at one time with all transmitters in assurance network;
4) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network adopts IFFT that cascade interweaved FFT processed empty frequency modulation coding modulation data piece is transformed to the cascade interweaved coding modulation data sample value of sky frequency modulation time domain discrete processed piece D
total=[d
0, d
1..., d
k-2, d
k-1];
5) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network separates successively and generates the strange sub-block D of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed by time domain discrete processed empty frequency modulation cascade interweaved 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 empty frequency modulation time domain discrete processed
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 empty frequency modulation time domain discrete processed
even=[d
1, d
3..., d
k-3, d
k-1];
6) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network 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 empty frequency modulation time domain discrete processed
very, the even sub-block D of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed
evencarry out signal power adjustment and corresponding signal and process also the synthetic new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed piece D again
new, the new cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed 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 empty frequency modulation time domain discrete processed 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 the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece falls
and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio 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 empty frequency modulation time domain discrete processed
verythe cascade interweaved coding modulation data sample value of each empty frequency modulation time domain discrete processed carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains; D
*even expression the even sub-block D of the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed
eventhe cascade interweaved coding modulation data sample value of each empty frequency modulation time domain discrete processed carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed sub-block that obtains;
7) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network 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 single-frequency network anti-fading mobile digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece of training sequence discrete sample block;
8) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network will fall the cascade interweaved coding modulation data sample value of empty frequency modulation time domain discrete processed of peak-to-average power ratio piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio sky frequency modulation time domain discrete processed piece, as frame;
9) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of the empty frequency modulation time domain discrete processed of peak-to-average power ratio piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) the anti-fading mobile digital broadcast signal transmitter of each in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that each the anti-fading mobile digital broadcast signal transmitter in the anti-fading mobile digital broadcast signal receiver detection reception single frequency network in single frequency network 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 mobile digital broadcast signal transmission method for single-frequency network 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 mobile digital broadcast signal transmission method for single-frequency network 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-fading mobile digital broadcast signal transmission method for single-frequency network 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 mobile digital broadcast signal transmission method for single-frequency network 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; 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.
6. by the anti-fading mobile digital broadcast signal transmission method for single-frequency network of claim 1, it is characterized in that: the baseband signal reception & disposal that described single-frequency network anti-fading mobile digital 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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