CN103780565A - Single-frequency network anti-interference mobile digital broadcasting signal transmission method - Google Patents
Single-frequency network anti-interference mobile digital broadcasting signal transmission method Download PDFInfo
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Abstract
The invention discloses a single-frequency network anti-interference 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-interference 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-interference mobile digital broadcast signal transmission method for single-frequency network.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital Television anti-interference mobile digital broadcast transmission system, as the important component part of Digital Television anti-interference mobile digital broadcast, the development of its correlation technique, closely bound up with people's quality of life, and be therefore subject to people's extensive concern especially.Digital Television anti-interference mobile digital broadcast correlation technique and related industry thereof are that in Communications And Computer field, development is very fast, the industry of good market prospect.In Digital Television anti-interference mobile digital broadcast correlation technique, the emphasis that various countries pay close attention to is at present that the Digital Television anti-interference mobile digital broadcast how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Single frequency network anti-interference mobile digital broadcast signal transmitter framing modulation technique is the key technology of Digital Television anti-interference mobile digital broadcast system, plays conclusive effect for whole system performance, is the object of everybody primary study.
Due to the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes and becomes more and more easier.Because OFDM Multicarrier Transmission Technology has simple in structure, the availability of frequency spectrum is high, the plurality of advantages such as can resist frequency selectivity and channel time, becomes and extremely everybody concern obtain deep research and extensive use in the numerous areas such as Xdsl, wide-band mobile communication, wideband wireless local area network, Digital Television anti-interference mobile digital broadcast.
The peak-to-average power ratio (PAPR) that ofdm signal is higher has very high requirement to the range of linearity of amplifier and digital to analog converter, if system linearity scope can not meet the variation of signal, can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between subchannel to be destroyed, produce phase mutual interference, make system performance degradation.Therefore the solution that, must consider how to reduce the probability of occurrence of large peak power signal in ofdm signal and reduce nonlinear distortion impact.
Adopt the networking model of single frequency network can greatly improve the availability of frequency spectrum of Digital Television anti-interference mobile digital broadcast transmission system.In practical communication environment, Digital Television anti-interference mobile digital broadcast communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Single frequency network anti-interference mobile digital broadcast signal transmitter transmission method is the key technology that realizes reliable digit TV anti-interference mobile digital broadcast.
Utilizing Digital Television anti-interference mobile digital broadcast transmission system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital TV anti-interference mobile digital broadcast transmission system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of anti-interference mobile digital broadcast signal transmission method for single-frequency network just, can meet High Data Rate and can control the needs that multi-service Digital Television anti-interference mobile digital broadcast 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.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stationary?portable?and?mobile?use.”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service Digital Television anti-interference mobile digital broadcast problem, proposed a kind of anti-interference mobile digital broadcast signal transmission method for single-frequency network.
A kind of anti-interference 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 deleted the input data bit multi code Rate of Chinese character of flowing through remaining convolutional encoding, Bit Interleave, code element modulation and code element and is rotated in and on frequency domain, forms FFT Bit Interleave coding modulation data piece, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number;
3) the network data management device of single frequency network to adopt code check be 1 space-frequency coding device is modulated to the FFT Bit Interleave coding modulation data piece forming on frequency domain on each anti-interference mobile digital broadcast signal transmitter branch road in single frequency network, to form empty frequency modulation FFT Bit Interleave processed coding modulation data piece, and the time synchronized of adjusting each anti-interference mobile digital broadcast signal transmitter branch road is all processed empty frequency modulation FFT Bit Interleave processed coding modulation data piece at one time with all transmitters in assurance network;
4) each anti-interference mobile digital broadcast signal transmitter in single frequency network adopts IFFT that FFT Bit Interleave coding modulation data piece processed empty frequency modulation is transformed to sky frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
5) each anti-interference mobile digital broadcast signal transmitter in single frequency network separates successively and generates the strange sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing processed empty frequency modulation and according to the sequencing odd even of each empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
6) each anti-interference mobile digital broadcast signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
very, the even sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D again
new, new empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece falls
and the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryrepresent the strange sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
veryeach empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value sub-block that obtains; D
* evenrepresent the even sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
eveneach empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value sub-block that obtains;
7) each anti-interference mobile digital broadcast signal transmitter Insert service index series after training sequence in single frequency network 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-interference mobile digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece of training sequence discrete sample block;
8) each anti-interference mobile digital broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece, as frame;
9) each anti-interference mobile digital broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each anti-interference mobile digital broadcast signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each anti-interference 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;
12) radiofrequency signal that each anti-interference mobile digital broadcast signal transmitter in the detection of the anti-interference mobile digital broadcast signal receiver in single frequency network reception 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 anti-interference mobile digital broadcast signal transmission method in above-mentioned single frequency network, it is characterized in that: each anti-interference mobile digital broadcast signal transmitter in single frequency network the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece falls by empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece demultiplexing and separate successively the empty frequency modulation time domain discrete Bit Interleave processed strange sub-block of coding modulation data sample value of generation and empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value idol sub-block according to the sequencing odd even of each empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value and carry out signal power adjustment and corresponding signal and process and pass through 18 kinds of generate patterns of particular design and again synthesize; The training sequence of each anti-interference 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 anti-interference mobile digital broadcast signal transmitter signal frame in single frequency network is 1/16 of FFT Bit Interleave coding modulation data block length K; The operational indicator sequence of each anti-interference 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-interference 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-interference mobile digital broadcast signal transmitter; The FFT Bit Interleave coding modulation data piece of each anti-interference 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 that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to 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.
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 Bit Interleave processed coding modulation data sample value piece demultiplexing also separates successively and generates the empty frequency modulation time domain discrete Bit Interleave processed strange sub-block of coding modulation data sample value and the even sub-block of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value and the corresponding signal power adjustment of carrying out and signal processing according to the sequencing odd even of each empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value, what by particular design 18 kinds fell the generate pattern of the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece and had a minimum peak-to-average power ratio falls peak-to-average power ratio sky frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece choosing method, but the very high large peak power signal probability of the maximum peak power that not only can make full use of ofdm signal is very low, the power regularity of distribution that the characteristic that the real part (or imaginary part) of the ofdm signal in the time that number of sub carrier wave is larger is multiple Gaussian random process and whose amplitude obeys Rayleigh distribution and then low complex degree ground effectively change over frame signal reaches the object that reduces peak-to-average power ratio, the amount of information of the required extra transmission of generate pattern adopting is little, be easy to process at receiver end the primary signal of recovering to obtain ofdm signal, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.Training sequence in the signal frame of each anti-interference 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 empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece that the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece falls in the time domain embedding training sequence of each anti-interference 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-interference mobile digital broadcast signal receiver can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic are reliably followed the tracks of.Insert time domain embedding training sequence using Cyclic Prefix as protection interval and fall the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece to form signal frame, can reduce the interference effect between adjacent signals frame.Adopt BICM to carry out Bit Interleave coded modulation to input data and improved diversity order, the bit error performance that communication system has been had under multidiameter fading channel.Code element modulation rotates with code element the diversity that mobile digital broadcast signal is provided.Each different operational indicator sequence of each anti-interference 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-interference mobile digital broadcast signal transmitter, can make Digital Television anti-interference mobile digital broadcast transmission system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Transmission method of the present invention has low peak-to-average power ratio, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide High Data Rate can control the plurality of advantages such as multi-service Digital Television anti-interference mobile digital broadcast transmission.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of the single frequency network transmitter of anti-interference 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-interference 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-interference 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 deleted the input data bit multi code Rate of Chinese character of flowing through remaining convolutional encoding, Bit Interleave, code element modulation and code element and is rotated in and on frequency domain, forms FFT Bit Interleave coding modulation data piece, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to 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;
3) the network data management device of single frequency network to adopt code check be 1 space-frequency coding device is modulated to the FFT Bit Interleave coding modulation data piece forming on frequency domain on each anti-interference mobile digital broadcast signal transmitter branch road in single frequency network, to form empty frequency modulation FFT Bit Interleave processed coding modulation data piece, and the time synchronized of adjusting each anti-interference mobile digital broadcast signal transmitter branch road is all processed empty frequency modulation FFT Bit Interleave processed coding modulation data piece at one time with all transmitters in assurance network;
4) each anti-interference mobile digital broadcast signal transmitter in single frequency network adopts IFFT that FFT Bit Interleave coding modulation data piece processed empty frequency modulation is transformed to sky frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
5) each anti-interference mobile digital broadcast signal transmitter in single frequency network separates successively and generates the strange sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing processed empty frequency modulation and according to the sequencing odd even of each empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
6) each anti-interference mobile digital broadcast signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
very, the even sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D again
new, new empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece falls
and the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryrepresent the strange sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
veryeach empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value sub-block that obtains; D
* evenrepresent the even sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
eveneach empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value sub-block that obtains;
7) each anti-interference mobile digital broadcast signal transmitter Insert service index series after training sequence in single frequency network 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-interference mobile digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece of training sequence discrete sample block;
8) each anti-interference mobile digital broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece, as frame;
9) each anti-interference mobile digital broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each anti-interference mobile digital broadcast signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each anti-interference 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;
12) radiofrequency signal that each anti-interference mobile digital broadcast signal transmitter in the detection of the anti-interference mobile digital broadcast signal receiver in single frequency network reception 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-interference 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 deleted the input data bit multi code Rate of Chinese character of flowing through remaining convolutional encoding, Bit Interleave, code element modulation and code element and is rotated in and on frequency domain, forms FFT Bit Interleave coding modulation data piece; To adopt code check be 1 space-frequency coding device is modulated to the FFT Bit Interleave coding modulation data piece forming on frequency domain on each anti-interference mobile digital broadcast signal transmitter branch road in single frequency network, to form empty frequency modulation FFT Bit Interleave processed coding modulation data piece, and the time synchronized of adjusting each anti-interference mobile digital broadcast signal transmitter branch road is all processed empty frequency modulation FFT Bit Interleave processed coding modulation data piece at one time with all transmitters in assurance network; Be transformed to sky frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece through IFFT again, generate and choose the empty frequency modulation of the peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value 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.
Empty frequency modulation FFT Bit Interleave processed coding modulation data piece is made up of subcarrier.The length of empty frequency modulation FFT Bit Interleave processed coding modulation data piece is K, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to 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.
The training sequence of each anti-interference 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-interference 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 anti-interference 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-interference 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-interference mobile digital broadcast signal transmitter.
The time domain of each anti-interference mobile digital broadcast signal transmitter in single frequency network embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece of training sequence discrete sample block; Each anti-interference mobile digital broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece, as frame; Each anti-interference mobile digital broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C; The circulating prefix-length C of each anti-interference mobile digital broadcast signal transmitter signal frame in single frequency network is 1/16 of FFT Bit Interleave coding modulation data block length K.
Each anti-interference 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-interference 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-interference mobile digital broadcast signal transmitter in anti-interference 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-interference 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 deleted the input data bit multi code Rate of Chinese character of flowing through remaining convolutional encoding, Bit Interleave, code element modulation and code element and is rotated in and on frequency domain, forms FFT Bit Interleave coding modulation data piece, the length of FFT Bit Interleave coding modulation data piece is K, and the numerical value of K is got even number;
3) the network data management device of single frequency network to adopt code check be 1 space-frequency coding device is modulated to the FFT Bit Interleave coding modulation data piece forming on frequency domain on each anti-interference mobile digital broadcast signal transmitter branch road in single frequency network, to form empty frequency modulation FFT Bit Interleave processed coding modulation data piece, and the time synchronized of adjusting each anti-interference mobile digital broadcast signal transmitter branch road is all processed empty frequency modulation FFT Bit Interleave processed coding modulation data piece at one time with all transmitters in assurance network;
4) each anti-interference mobile digital broadcast signal transmitter in single frequency network adopts IFFT that FFT Bit Interleave coding modulation data piece processed empty frequency modulation is transformed to sky frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D
total=[d
0, d
1..., d
k-2, d
k-1];
5) each anti-interference mobile digital broadcast signal transmitter in single frequency network separates successively and generates the strange sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value by time domain discrete Bit Interleave coding modulation data sample value piece demultiplexing processed empty frequency modulation and according to the sequencing odd even of each empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
even=[d
1, d
3..., d
k-3, d
k-1];
6) each anti-interference mobile digital broadcast signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
very, the even sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D again
new, new empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece falls
and the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryrepresent the strange sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
veryeach empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value sub-block that obtains; D
* evenrepresent the even sub-block D of empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value
eveneach empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value carry out conjugate operation processing and the empty frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value sub-block that obtains;
7) each anti-interference mobile digital broadcast signal transmitter Insert service index series after training sequence in single frequency network 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-interference mobile digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece of training sequence discrete sample block;
8) each anti-interference mobile digital broadcast signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete Bit Interleave processed coding modulation data sample value piece, as frame;
9) each anti-interference mobile digital broadcast signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete Bit Interleave processed coding modulation data sample value piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each anti-interference mobile digital broadcast signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each anti-interference 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;
12) radiofrequency signal that each anti-interference mobile digital broadcast signal transmitter in the detection of the anti-interference mobile digital broadcast signal receiver in single frequency network reception 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-interference 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-interference 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-interference 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-interference mobile digital broadcast signal transmission method for single-frequency network of claim 1, it is characterized in that: described FFT Bit Interleave coding modulation data piece is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The encoding rate that multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8, Bit Interleave adopts random interleaving mode, code element is modulated to 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.
6. by the anti-interference 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-interference 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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