CN102263756A - Anti-noise mobile digital broadcast signal transmitting method - Google Patents
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Abstract
The invention discloses an anti-noise mobile digital broadcast signal transmitting method, and relates to a time domain/frequency domain mixed scheme. The anti-noise mobile digital broadcast signal transmitting method has the advantages of low peak-to-average power ratio, short synchronization time, resistance to noise, controllable multiple services and the like.
Description
Technical field
The invention belongs to moving communicating field, relate more specifically to a kind of antinoise mobile digital broadcast method for transmitting signals.
Background technology
At present, television broadcasting develops to the digitlization direction gradually from simulation.Digital Television mobile digital broadcast transmission system, as the important component part of Digital Television mobile digital broadcast, its development of technologies, closely bound up with people's quality of life, and therefore be subjected to people's extensive concern especially.Digital Television mobile digital broadcast correlation technique and related industry thereof are that development is very fast in the Communications And Computer field, the industry of good market prospect.On Digital Television antinoise mobile digital broadcast correlation technique, the emphasis of various countries' concern at present is that the Digital Television antinoise mobile digital broadcast how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Antinoise mobile digital broadcast signal transmitter transmission technology is the key technology of Digital Television antinoise mobile digital broadcast system, for whole system performance decisive role, is the object of everybody primary study.
Because the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes becoming more and more easier.Because of OFDM multi-carrier transmission technology has simple in structure, the availability of frequency spectrum high plurality of advantages such as becomes and extremely everybody concern and obtain deep research and the extensive use in numerous areas such as Xdsl, wide-band mobile communication, broadband mobile LAN, Digital Television antinoise mobile digital broadcast in the time of can resisting frequency selectivity and channel.
Peak-to-average power ratio (PAPR) pair amplifier that ofdm signal is higher and the range of linearity of digital to analog converter have very high requirement, if the system linearity scope can not satisfy the variation of signal, then can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between the subchannel to be destroyed, produce the phase mutual interference, make system performance degradation.Therefore, the solution that must consider how to reduce the probability of occurrence of big peak power signal in the ofdm signal and reduce the nonlinear distortion influence.
Chnnel coding is the important component part of digital communication system.Along with the develop rapidly of modern information technologies, channel coding technology has become the indispensable technology in modern communications field.Embed redundancy symbol in information sequence, the effect of channel coding technology by redundancy symbol reduces signal and makes a mistake in transmission course, thereby improves the reliability of communication system.(Low Density Parity Check, LDPC) sign indicating number is a kind ofly to be used in noise transmission channel transmission information and to carry out the error correcting code of forward error correction (FEC, Forward Error Correction) to low-density checksum.LDPC coding be a kind of message transmission rate that can make near theoretical maximum, i.e. the encoding scheme of shannon limit.
In the practical communication environment, Digital Television mobile digital broadcast communication system performance is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Antinoise mobile digital broadcast signal transmitter transmission method is the key technology that realizes reliable digit TV antinoise mobile digital broadcast.
Utilizing Digital Television mobile digital broadcast transmission system that may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service are provided is embodiments that Digital Television mobile digital broadcast transmission system of new generation satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of antinoise mobile digital broadcast method for transmitting signals, can satisfy the needs of High Data Rate may command multi-service Digital Television antinoise mobile digital broadcast transmission.
Desire is done more deep understanding to the 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.
Z.Li，L.Chen，L.Zeng，S.Lin，W.Fong，“Efficient?encoding?of?quasi-cyclic?low-density?parity-check?codes，”IEEE?Trans.Commun.，vol.54，no.1，pp.71-81，Jan.2006.
Summary of the invention
The present invention is directed to High Data Rate may command multi-service Digital Television antinoise mobile digital broadcast problem, proposed a kind of antinoise mobile digital broadcast method for transmitting signals.
A kind of antinoise mobile digital broadcast method for transmitting signals that the present invention proposes is characterized in that it comprises the following steps:
1) antinoise mobile digital broadcast signal transmitter converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling and handled to form the input data bit flow;
2) antinoise mobile digital broadcast signal transmitter is flowed through the input data bit of oneself and is formed the FFT coded data block after LDPC coding, code element modulation are rotated with code element on frequency domain, FFT represents the fast discrete Fourier conversion, and the length of FFT coded data block is K; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, 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) antinoise mobile digital broadcast signal transmitter adopts IFFT that the FFT coded data block is transformed to time domain discrete coded data sample value piece D
Total, IFFT represents the fast discrete Fourier inverse transformation;
4) antinoise mobile digital broadcast signal transmitter is divided equally into two with time domain discrete coded data sample value piece in order, the sub-piece D of time domain discrete coded data sample value
1With the sub-piece D of time domain discrete coded data sample value
2, D
Total=[D
1, D
2];
5) antinoise mobile digital broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete coded data sample value
1, the sub-piece D of time domain discrete coded data sample value
2Carry out that signal adds, subtracts, conjugate operation is handled and synthetic again new time domain discrete coded data sample value piece D
New, new time domain discrete coded data sample value piece D
NewAdopt following generate pattern to obtain, generate pattern 1 is D
New=[D
1, D
2], 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
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the synthetic time domain discrete coded data sample value piece D of 12 kinds of generate patterns
New, choose wherein have a minimum peak-to-average power ratio peak-to-average power ratio time domain discrete coded data sample value piece falls
And peak-to-average power ratio time domain discrete coded data sample value piece will fall
The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D
* 1Expression is to the sub-piece D of time domain discrete coded data sample value
1Each time domain discrete coded data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete coded data sample value that obtains;
6) antinoise mobile digital broadcast signal transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is provided with the imaginary part sequence of the set operational indicator sequence in unit as sequence of plural training, on time domain, constitute the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing antinoise mobile digital broadcast signal transmitter;
7) antinoise mobile digital broadcast signal transmitter will repeat 4 times continuously and form time domain embedding training sequence discrete sample block on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete coded data sample value piece, i.e. K=4 * X of training sequence discrete sample block;
8) antinoise mobile digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete coded data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete coded data sample value piece, as frame;
9) antinoise mobile digital broadcast signal transmitter at interval is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete coded data sample value piece be frame with Cyclic Prefix as protection, and to form signal frame, the length of Cyclic Prefix is C;
10) antinoise mobile digital broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) antinoise mobile digital broadcast signal transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) antinoise mobile digital broadcast signal receiver detect to receive radiofrequency signal that antinoise mobile digital broadcast signal transmitter sent and its down-conversion is formed baseband signal, utilizes the architectural characteristic of the Cyclic Prefix characteristic of signal frame and signal frame to carry out baseband signal and receives and handle.
Antinoise mobile digital broadcast method for transmitting signals according to above-mentioned is characterized in that: antinoise mobile digital broadcast signal transmitter fall peak-to-average power ratio time domain discrete coded data sample value piece by the signal that the sub-piece of time domain discrete coded data sample value is undertaken by specific 12 kinds of generate patterns add, subtract, conjugate operation is handled and synthetic again; Have periodic time domain in the signal frame of antinoise mobile digital broadcast signal transmitter and embed training sequence discrete sample block; The length X of the training sequence of antinoise mobile digital broadcast signal transmitter is in 512,1024,2048, the length K of corresponding FFT data block is respectively 2048,4096,8192, the frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively 1/4,1/8,1/16 of FFT data block length K size; The training sequence of antinoise mobile digital broadcast signal transmitter, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of antinoise mobile digital broadcast signal transmitter have orthogonality each other; Each different operational indicator sequence of antinoise mobile digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing antinoise mobile digital broadcast signal transmitter; The encoding rate that the input data are carried out LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8.Antinoise mobile digital broadcast signal receiver can make full use of the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame is carried out baseband signal reception processing, handles comprising the time domain and frequency domain combined alternate analysis to signal frame head and signal frame body.
Characteristics of the present invention:
The present invention is the transmission plan that a kind of time-domain and frequency-domain mixes.Generate pattern of falling peak-to-average power ratio time domain discrete coded data sample value piece of the present invention and have a minimum peak-to-average power ratio peak-to-average power ratio time domain discrete coded data sample value piece choosing method falls, but the very high big peak power signal probability of the maximum peak power that not only can make full use of ofdm signal is very low, the real part (or imaginary part) of the ofdm signal when number of sub carrier wave is big is the characteristic of multiple Gaussian random process and whose amplitude obeys Rayleigh distribution, the amount of information of the required extra transmission of being adopted of generate pattern is little, be easy to handle the primary signal of recovering to obtain ofdm signal at receiver end, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.Have periodic time domain in the signal frame of antinoise mobile digital broadcast signal transmitter and embed training sequence discrete sample block, the training sequence of antinoise mobile digital broadcast signal transmitter, the operational indicator sequence has pseudo-random characteristics, the training sequence of antinoise mobile digital broadcast signal transmitter, the operational indicator sequence has orthogonality each other, it is by falling peak-to-average power ratio time domain discrete coded data sample value piece that peak-to-average power ratio time domain discrete coded data sample value piece falls in the time domain embedding training sequence of antinoise mobile digital broadcast signal transmitter, time domain embeds training sequence discrete sample block and directly superposes and form, and these have guaranteed that antinoise 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 reliably followed the tracks of.Cyclic Prefix is inserted time domain embedding training sequence at interval as protection fall peak-to-average power ratio time domain discrete coded data sample value piece, can reduce the interference effect between the adjacent signals frame to form signal frame.Adopt the LDPC coding that the input data are carried out chnnel coding error-correcting performance near shannon limit is provided.Code element modulation and constellation rotation provide the diversity of mobile digital broadcast signal.Each different operational indicator sequence of antinoise mobile digital broadcast signal transmitter is comprising and unique each system parameters and business model information of expressing antinoise mobile digital broadcast signal transmitter, Digital Television antinoise mobile digital broadcast transmission system can satisfy social needs so that can provide may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service.Transmission method of the present invention has the equal power ratio of ebb, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide plurality of advantages such as High Data Rate may command multi-service Digital Television antinoise mobile digital broadcast transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to signal transmission between certain transmitter and receiver of antinoise mobile digital broadcast method for transmitting signals of the present invention.
Fig. 2 is the embodiment schematic diagram that forms according to signal frame in the signals transmission between certain transmitter and receiver of antinoise mobile digital broadcast method for transmitting signals of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
The embodiment schematic diagram of signal transmission between certain transmitter and receiver of the antinoise mobile digital broadcast method for transmitting signals that proposes according to the present invention as shown in Figure 1, follows these steps to carry out:
1) this certain antinoise mobile digital broadcast signal transmitter converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling and handled to form the input data bit flow;
2) this certain antinoise mobile digital broadcast signal transmitter is flowed through the input data bit of oneself and is formed the FFT coded data block after LDPC coding, code element modulation are rotated with code element on frequency domain, FFT represents the fast discrete Fourier conversion, and the length of FFT coded data block is K; The encoding rate that the input data are carried out LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, 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) this certain antinoise mobile digital broadcast signal transmitter adopts IFFT that the FFT coded data block is transformed to time domain discrete coded data sample value piece D
Total, IFFT represents the fast discrete Fourier inverse transformation;
4) this certain antinoise mobile digital broadcast signal transmitter is divided equally into two with time domain discrete coded data sample value piece in order, the sub-piece D of time domain discrete coded data sample value
1With the sub-piece D of time domain discrete coded data sample value
2, D
Total=[D
1, D
2];
5) this certain antinoise mobile digital broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete coded data sample value
1, the sub-piece D of time domain discrete coded data sample value
2Carry out that signal adds, subtracts, conjugate operation is handled and synthetic again new time domain discrete coded data sample value piece D
New, new time domain discrete coded data sample value piece D
NewAdopt following generate pattern to obtain, generate pattern 1 is D
New=[D
1, D
2], 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
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the synthetic time domain discrete coded data sample value piece D of 12 kinds of generate patterns
New, choose wherein have a minimum peak-to-average power ratio peak-to-average power ratio time domain discrete coded data sample value piece falls
And peak-to-average power ratio time domain discrete coded data sample value piece will fall
The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D
* 1Expression is to the sub-piece D of time domain discrete coded data sample value
1Each time domain discrete coded data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete coded data sample value that obtains;
7) this certain antinoise mobile digital broadcast signal transmitter is with the real part sequence of training sequence as sequence of plural training, the operational indicator sequence is provided with the imaginary part sequence of the set operational indicator sequence in unit as sequence of plural training, on time domain, constitute the discrete sample block of sequence of plural training, training sequence, the operational indicator sequence, the length of the discrete sample block of sequence of plural training all is X, the operational indicator sequence is comprising and unique each system parameters and business model information of expressing antinoise mobile digital broadcast signal transmitter, and X gets 512,1024, in 2048 one;
7) this certain antinoise mobile digital broadcast signal transmitter will repeat 4 times continuously and form time domain embedding training sequence discrete sample block on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete coded data sample value piece, i.e. K=4 * X of training sequence discrete sample block; When X got 512, K got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, K got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, K got 8192, and the frequency interval of corresponding subcarrier is got 1KHz;
8) this certain antinoise mobile digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete coded data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete coded data sample value piece, as frame;
9) this certain antinoise mobile digital broadcast signal transmitter at interval is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete coded data sample value piece be frame with Cyclic Prefix as protection, and to form signal frame, the length of Cyclic Prefix is C; When X got 512, C got 1/4 of K size; When X got 1024, C got 1/8 of K size; When X got 2048, C got 1/16 of K size;
10) this certain antinoise mobile digital broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) this certain antinoise mobile digital broadcast signal transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) this certain antinoise mobile digital broadcast signal receiver detects and receives radiofrequency signal that antinoise mobile digital broadcast signal transmitter sent and its down-conversion is formed baseband signal, utilize the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception processing, handle comprising time domain and frequency domain combined alternate analysis to signal frame head and signal frame body.
According to the embodiment schematic diagram that signal frame in the signals transmission between certain transmitter and receiver of antinoise mobile digital broadcast method for transmitting signals of the present invention forms, as shown in Figure 2, specifically implement as follows:
This certain antinoise mobile digital broadcast signal transmitter converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling and handled to form the input data bit flow.
This certain antinoise mobile digital broadcast signal transmitter is flowed through the input data bit of oneself and is formed the FFT coded data block after LDPC coding, code element modulation are rotated with code element on frequency domain, through IFFT it is transformed to the discrete coded data sample value piece of time domain again, generates by the peak-to-average power ratio adjustment unit and choose the peak-to-average power ratio time domain discrete coded data sample value piece that falls that wherein has minimum peak-to-average power ratio and simultaneously the generate pattern information of the corresponding employing of institute is sent to the operational indicator sequence unit is set.Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, 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 FFT data block is made up of subcarrier.The length of FFT data block is K; When X got 512, corresponding K got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, corresponding K got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, corresponding K got 8192, and the frequency interval of corresponding subcarrier is got 1KHz.
This certain antinoise mobile digital broadcast signal transmitter with training sequence as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, on time domain, constitute the discrete sample block of sequence of plural training, on time domain, it is repeated 4 times continuously again and form time domain embedding training sequence discrete sample block.The length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and X gets in 512,1024,2048, and the length that time domain embeds training sequence discrete sample block is K, K=4 * X.Training sequence, operational indicator sequence as antinoise mobile digital broadcast signal transmitter are formed by a series of 1 or-1, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.The training sequence that satisfies above-mentioned feature can be by realizing as one group of displacement m sequence of a kind of specific type of pseudo-random number sequence with as the walsh sequence of orthogonal sequence, Hadamard sequences or by the orthogonal sequence that other modes produce.Each different operational indicator sequence is comprising and unique each system parameters and business model information of expressing antinoise mobile digital broadcast signal transmitter.This certain antinoise mobile digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete coded data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete coded data sample value piece, as frame; Embed training sequence in time domain and fall and insert Cyclic Prefix in the peak-to-average power ratio time domain discrete coded data sample value piece at interval, form signal frame as protection.Length as protection Cyclic Prefix at interval is C; When X got 512, corresponding C got 1/4 of K size; When X got 1024, corresponding C got 1/8 of K size; When X got 2048, corresponding C got 1/16 of K size.This certain antinoise mobile digital broadcast signal transmitter adopts square root raised cosine filter that the signal of signal frame is carried out pulse shaping.When X got 512, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.1; When X got 1024, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.05; When X got 2048, the rolloff-factor that corresponding signal to signal frame carries out the square root raised cosine filter of pulse shaping got 0.025.
This certain antinoise mobile digital broadcast signal transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave.
This certain antinoise mobile digital broadcast signal receiver detects and receives radiofrequency signal that antinoise mobile digital broadcast signal transmitter sent and its down-conversion is formed baseband signal, utilize the Cyclic Prefix characteristic of signal frame and the architectural characteristic of signal frame to carry out baseband signal reception processing, handle comprising time domain and frequency domain combined alternate analysis to signal frame head and signal frame body.
In conjunction with the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to the foregoing description, under the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.
Claims (7)
1. an antinoise mobile digital broadcast method for transmitting signals is characterized in that it comprises the following steps:
1) antinoise mobile digital broadcast signal transmitter converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling and handled to form the input data bit flow;
2) antinoise mobile digital broadcast signal transmitter is flowed through the input data bit of oneself and is formed the FFT coded data block after LDPC coding, code element modulation are rotated with code element on frequency domain, LDPC represents low-density checksum, FFT represents the fast discrete Fourier conversion, and the length of FFT coded data block is K; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, 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) antinoise mobile digital broadcast signal transmitter adopts IFFT that the FFT coded data block is transformed to time domain discrete coded data sample value piece D
Total, IFFT represents the fast discrete Fourier inverse transformation;
4) antinoise mobile digital broadcast signal transmitter is divided equally into two with time domain discrete coded data sample value piece in order, the sub-piece D of time domain discrete coded data sample value
1With the sub-piece D of time domain discrete coded data sample value
2, D
Total=[D
1, D
2];
5) antinoise mobile digital broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete coded data sample value
1, the sub-piece D of time domain discrete coded data sample value
2Carry out that signal adds, subtracts, conjugate operation is handled and synthetic again new time domain discrete coded data sample value piece D
New, new time domain discrete coded data sample value piece D
NewAdopt following generate pattern to obtain, generate pattern 1 is D
New=[D
1, D
2], 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
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the synthetic time domain discrete coded data sample value piece D of 12 kinds of generate patterns
New, choose wherein have a minimum peak-to-average power ratio peak-to-average power ratio time domain discrete coded data sample value piece falls
And peak-to-average power ratio time domain discrete coded data sample value piece will fall
The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D
* 1Expression is to the sub-piece D of time domain discrete coded data sample value
1Each time domain discrete coded data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete coded data sample value that obtains;
6) antinoise mobile digital broadcast signal transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is provided with the imaginary part sequence of the set operational indicator sequence in unit as sequence of plural training, on time domain, constitute the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing antinoise mobile digital broadcast signal transmitter;
7) antinoise mobile digital broadcast signal transmitter will repeat 4 times continuously and form time domain embedding training sequence discrete sample block on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete coded data sample value piece, i.e. K=4 * X of training sequence discrete sample block;
8) antinoise mobile digital broadcast signal transmitter will fall peak-to-average power ratio time domain discrete coded data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete coded data sample value piece, as frame;
9) antinoise mobile digital broadcast signal transmitter at interval is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete coded data sample value piece be frame with Cyclic Prefix as protection, and to form signal frame, the length of Cyclic Prefix is C;
10) antinoise mobile digital broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
11) antinoise mobile digital broadcast signal transmitter forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
12) antinoise mobile digital broadcast signal receiver detect to receive radiofrequency signal that antinoise mobile digital broadcast signal transmitter sent and its down-conversion is formed baseband signal, utilizes the architectural characteristic of the Cyclic Prefix characteristic of signal frame and signal frame to carry out baseband signal and receives and handle.
2. by the antinoise mobile digital broadcast method for transmitting signals of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described antinoise mobile digital broadcast signal transmitter, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the antinoise mobile digital broadcast method for transmitting signals of claim 2, it is characterized in that: described training sequence, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; Described training sequence, operational indicator sequence have orthogonality each other.
4. by the antinoise mobile digital broadcast method for transmitting signals of claim 1, it is characterized in that: described FFT data block is made up of subcarrier; When X got 512, sub-carrier number got 2048, and the frequency interval of subcarrier is got 4KHz; When X got 1024, sub-carrier number got 4096, and the frequency interval of subcarrier is got 2KHz; When X got 2048, sub-carrier number got 8192, and the frequency interval of subcarrier is got 1KHz.
5. by the antinoise mobile digital broadcast method for transmitting signals of claim 1, it is characterized in that: the length C value of described Cyclic Prefix is relevant with the X value; When X got 512, C got 1/4 of K size; When X got 1024, C got 1/8 of K size; When X got 2048, C got 1/16 of K size.
6. by the antinoise mobile digital broadcast method for transmitting signals of claim 1, it is characterized in that: the described encoding rate that the input data are carried out the LDPC coding is in 1/4,1/2,5/8,3/4 and 7/8.
7. press the antinoise mobile digital broadcast method for transmitting signals of claim 1, it is characterized in that: the baseband signal that described antinoise mobile digital broadcast signal receiver is carried out receives to be handled, and one of them step is that the time domain and frequency domain combined alternate analysis of signal frame head and signal frame body is handled.
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| CN103780561A (en) * | 2014-01-13 | 2014-05-07 | 宁波大学 | Transmission method of anti-noise mobile digital broadcasting signals |
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| CN103780561A (en) * | 2014-01-13 | 2014-05-07 | 宁波大学 | Transmission method of anti-noise mobile digital broadcasting signals |
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