CN102263735B - Method for transmitting wireless signals in digital broadcasting single frequency network - Google Patents
Method for transmitting wireless signals in digital broadcasting single frequency network Download PDFInfo
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Abstract
The invention discloses a method for transmitting wireless signals in a digital broadcasting single frequency network, which is a mixed transmission scheme of time domain, frequency domain and space domain. The method has the advantages of low PAPR (peak-to-average power ratio), short synchronous time, channel-fading resistance, multiple controllable services and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of digital broadcasting single frequency network wireless method for transmitting signals.
Background technology
Digital Television digital broadcasting wireless transmitting system, as the important component part of Digital Television wireless digital broadcasting, 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 wireless digital broadcasting 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 wireless digital broadcasting correlation technique, the emphasis of various countries' concern at present is that the Digital Television wireless digital broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Digital broadcasting wireless signal transmitter transmission technology is the key technology of Digital Television wireless digital broadcasting 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 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, wideband wireless local area network, Digital Television wireless digital broadcasting in the time of can resisting frequency selectivity and channel.
The higher peak-to-average power ratio (PAPR) of ofdm signal has very high requirement to the range of linearity of amplifier and digital to analog converter, 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.
The networking model of employing single frequency network (that is, the same time of several transmitting stations is launched same signal to realize the reliable covering to certain coverage in same frequency) can improve the availability of frequency spectrum of Digital Television digital broadcasting wireless transmitting system greatly.In actual single frequency network communication environment, Digital Television digital broadcasting performance in wireless communication systems is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Digital broadcasting single frequency network wireless signal transmitter transmission method is the key technology that realizes reliable digit Television Digital broadcast single frequency network wireless transmission.
Utilizing Digital Television digital broadcasting single frequency network wireless transmission system to provide free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service etc. can control multi-service is the embodiment that Digital Television digital broadcasting wireless transmitting 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 digital broadcasting single frequency network wireless method for transmitting signals, can satisfy the needs that High Data Rate can be controlled the transmission of multi-service Digital Television digital broadcasting single frequency network wireless.
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.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service Digital Television digital broadcasting single frequency network wireless transmission problem, proposed a kind of digital broadcasting single frequency network wireless method for transmitting signals.
A kind of digital broadcasting single frequency network wireless method for transmitting signals 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 and handled to form the input data bit flow;
2) the network data management device of single frequency network will be imported data bit flow and form the FFT data block at frequency domain, and FFT represents the fast discrete Fourier conversion, and the length of FFT data block is K;
3) to adopt code check be that 1 space-frequency coding device will be modulated to each digital broadcasting wireless signal transmitter branch road in the single frequency network in the FFT data block that frequency domain forms and form and emptyly frequently modulate the FFT data block to the network data management device of single frequency network, and the time synchronized of adjusting each digital broadcasting wireless signal transmitter branch road is all modulated the FFT data block frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each digital broadcasting wireless signal transmitter in the single frequency network adopts IFFT that sky is modulated the FFT data block frequently and is transformed to the empty time domain discrete data sample block D that frequently modulates
Total, IFFT represents the fast discrete Fourier inverse transformation;
5) each digital broadcasting wireless signal transmitter in the single frequency network is modulated sky frequently time domain discrete data sample block in order and is divided equally into two, the empty sub-piece D of time domain discrete data sample that frequently modulates
1Frequently modulate the sub-piece D of time domain discrete data sample with sky
2, D
Total=[D
1, D
2];
6) each digital broadcasting wireless signal transmitter in the single frequency network is modulated the sub-piece D of time domain discrete data sample by the peak-to-average power ratio adjustment unit frequently to sky
1, the empty sub-piece D of time domain discrete data sample that frequently modulates
2Carry out that signal adds, subtracts, conjugate operation is handled and the synthetic new empty time domain discrete data sample block D that frequently modulates again
New, the new empty time domain discrete data sample block D that frequently modulates
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
Relatively 12 kinds of synthetic empty frequencies of generate pattern are modulated time domain discrete data sample block D
New, choose the empty frequency of peak-to-average power ratio that falls that wherein has minimum peak-to-average power ratio and modulate time domain discrete data sample block
And the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio will be fallen
The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D
* 1Expression is modulated the sub-piece D of time domain discrete data sample frequently to sky
1Each empty modulate that time domain discrete data sample carries out that conjugate operation is handled frequently and the empty sub-piece of time domain discrete data sample of frequently modulating that obtains;
7) each digital broadcasting wireless signal transmitter in the single frequency network inserts Cyclic Prefix at interval as protection and falls the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio, the empty time domain cyclic prefix discrete data sample block of frequently modulating of peak-to-average power ratio falls in formation, as frame, the length of Cyclic Prefix is C, and falling the empty length of modulating time domain cyclic prefix discrete data sample block frequently of peak-to-average power ratio is C+K;
8) each digital broadcasting wireless signal transmitter in the single frequency network with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute the discrete sample block of sequence of plural training in time domain, 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 the digital broadcasting wireless signal transmitter;
9) discrete sample block of the sequence of plural training that will constitute in time domain of each digital broadcasting wireless signal transmitter in the single frequency network repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
10) each digital broadcasting wireless signal transmitter in the single frequency network is that frame head is inserted into and falls peak-to-average power ratio empty frequently to modulate time domain cyclic prefix discrete data sample block be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
11) each digital broadcasting wireless signal transmitter in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
12) each digital broadcasting wireless signal transmitter in the single frequency network forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
13) the digital broadcasting wireless signal receiver in the single frequency network detect to receive radiofrequency signal that each digital broadcasting wireless signal transmitter in the single frequency network sends 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.
Digital broadcasting single frequency network wireless method for transmitting signals according to above-mentioned is characterized in that: each digital broadcasting wireless signal transmitter in the single frequency network fall that peak-to-average power ratio is empty modulates that time domain discrete data sample block modulates frequently by sky that the signal that the sub-piece of time domain discrete data sample undertakies by specific 12 kinds of generate patterns adds, subtracts, conjugate operation is handled frequently and synthetic again; Has periodic time domain repetition training series of discrete sample value piece in the signal frame of each digital broadcasting wireless signal transmitter in the single frequency network; The length X of the training sequence of each digital broadcasting wireless signal transmitter in the single frequency network is in 512,1024,2048, corresponding empty length K of modulating the FFT data block frequently is respectively 2048,4096,8192, the frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively empty 1/4,1/8,1/16 of the FFT data block length K size of frequently modulating; The training sequence of each digital broadcasting wireless signal transmitter in the single frequency network, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of each digital broadcasting wireless signal transmitter in the single frequency network have orthogonality each other; Each different operational indicator sequence of each digital broadcasting wireless signal transmitter in the single frequency network is comprising and unique each system parameters and business model information of expressing each digital broadcasting wireless signal transmitter in the single frequency network; The code check of space-frequency coding device is 1.Digital broadcasting wireless signal receiver in the single frequency network can take full advantage 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 mix in a kind of time-domain and frequency-domain spatial domain.The empty generate pattern of modulating time domain discrete data sample block frequently of peak-to-average power ratio of falling of the present invention is modulated the time domain discrete data sample block choosing method with the empty frequency of peak-to-average power ratio that falls with minimum peak-to-average power ratio, but the very high big peak power signal probability of the maximum peak power that not only can take full advantage 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 adopting 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.Has periodic time domain repetition training series of discrete sample value piece in the signal frame of each digital broadcasting wireless signal transmitter in the single frequency network, the training sequence of each digital broadcasting wireless signal transmitter in the single frequency network, the operational indicator sequence has pseudo-random characteristics, the training sequence of each digital broadcasting wireless signal transmitter in the single frequency network, the operational indicator sequence has orthogonality each other, the signal frame of each digital broadcasting wireless signal transmitter in the single frequency network is that frame head is inserted into that to fall the empty time domain cyclic prefix discrete data sample block of frequently modulating of peak-to-average power ratio be frame and forming by time domain repetition training series of discrete sample value piece, and these have guaranteed that the digital broadcasting wireless 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 fallen the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio to form signal frame body as the insertion of protection interval, can reduce the interference effect between signal frame head and the frame data.Each different operational indicator sequence of each digital broadcasting wireless signal transmitter in the single frequency network is comprising and unique each system parameters and business model information of expressing each digital broadcasting wireless signal transmitter in the single frequency network, Digital Television digital broadcasting single frequency network wireless transmission system can satisfy social needs so that can provide free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service etc. can control multi-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 High Data Rate can control plurality of advantages such as multi-service Digital Television digital broadcasting single frequency network wireless transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to signal transmission between the transmitter and receiver of digital broadcasting single frequency network wireless 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 the transmitter and receiver of digital broadcasting single frequency network wireless 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 the transmitter and receiver of the digital broadcasting single frequency network wireless method for transmitting signals that proposes 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 and handled to form the input data bit flow;
2) the network data management device of single frequency network will be imported data bit flow and form the FFT data block at frequency domain, and FFT represents the fast discrete Fourier conversion, and the length of FFT data block is K;
3) to adopt code check be that 1 space-frequency coding device will be modulated to each digital broadcasting wireless signal transmitter branch road in the single frequency network in the FFT data block that frequency domain forms and form and emptyly frequently modulate the FFT data block to the network data management device of single frequency network, and the time synchronized of adjusting each digital broadcasting wireless signal transmitter branch road is all modulated the FFT data block frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each digital broadcasting wireless signal transmitter in the single frequency network adopts IFFT that sky is modulated the FFT data block frequently and is transformed to the empty time domain discrete data sample block D that frequently modulates
Total, IFFT represents the fast discrete Fourier inverse transformation;
5) each digital broadcasting wireless signal transmitter in the single frequency network is modulated sky frequently time domain discrete data sample block in order and is divided equally into two, the empty sub-piece D of time domain discrete data sample that frequently modulates
1Frequently modulate the sub-piece D of time domain discrete data sample with sky
2, D
Total=[D
1, D
2];
6) each digital broadcasting wireless signal transmitter in the single frequency network is modulated the sub-piece D of time domain discrete data sample by the peak-to-average power ratio adjustment unit frequently to sky
1, the empty sub-piece D of time domain discrete data sample that frequently modulates
2Carry out that signal adds, subtracts, conjugate operation is handled and the synthetic new empty time domain discrete data sample block D that frequently modulates again
New, the new empty time domain discrete data sample block D that frequently modulates
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
Relatively 12 kinds of synthetic empty frequencies of generate pattern are modulated time domain discrete data sample block D
NewChoose the empty frequency of peak-to-average power ratio that falls that wherein has minimum peak-to-average power ratio and modulate time domain discrete data sample block
And the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio will be fallen
The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D
* 1Expression is modulated the sub-piece D of time domain discrete data sample frequently to sky
1Each empty modulate that time domain discrete data sample carries out that conjugate operation is handled frequently and the empty sub-piece of time domain discrete data sample of frequently modulating that obtains;
7) each digital broadcasting wireless signal transmitter in the single frequency network inserts Cyclic Prefix at interval as protection and falls the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio, the empty time domain cyclic prefix discrete data sample block of frequently modulating of peak-to-average power ratio falls in formation, as frame, the length of Cyclic Prefix is C, and falling the empty length of modulating time domain cyclic prefix discrete data sample block frequently of peak-to-average power ratio is C+K;
8) each digital broadcasting wireless signal transmitter in the single frequency network with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute the discrete sample block of sequence of plural training in time domain, 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 the digital broadcasting wireless signal transmitter; X gets in 512,1024,2048; When X got 512, K got 2048, C and gets 1/4 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 4KHz; When X got 1024, K got 4096, C and gets 1/8 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 2KHz; When X got 2048, K got 8192, C and gets 1/16 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 1KHz;
9) discrete sample block of the sequence of plural training that will constitute in time domain of each digital broadcasting wireless signal transmitter in the single frequency network repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
10) each digital broadcasting wireless signal transmitter in the single frequency network is that frame head is inserted into and falls peak-to-average power ratio empty frequently to modulate time domain cyclic prefix discrete data sample block be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
11) each digital broadcasting wireless signal transmitter in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
12) each digital broadcasting wireless signal transmitter in the single frequency network forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
13) the digital broadcasting wireless signal receiver in the single frequency network detect to receive radiofrequency signal that each digital broadcasting wireless signal transmitter in the single frequency network sends 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.
Embodiment according to signal frame formation (supposing has N transmitter in the single frequency network) in the signals transmission between the transmitter and receiver of digital broadcasting single frequency network wireless method for transmitting signals of the present invention, as shown in Figure 2, specifically implement 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 and handled to form the input data bit flow.
The network data management device of single frequency network will be imported data bit flow and form the FFT data block at frequency domain; Adopting code check is that 1 space-frequency coding device will be modulated to each digital broadcasting wireless signal transmitter branch road in the single frequency network in the FFT data block that frequency domain forms and form and emptyly frequently modulate the FFT data block, and the time synchronized of adjusting each digital broadcasting wireless signal transmitter branch road is all modulated the FFT data block frequently to sky at one time and handled to guarantee all transmitters in the network; Through IFFT it is transformed to the empty time domain discrete data sample block of frequently modulating again, generates and choose the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio of falling that wherein has minimum peak-to-average power ratio by the peak-to-average power ratio adjustment unit and simultaneously the generate pattern information of the corresponding employing of institute is sent to the operational indicator sequence unit is set.
Each digital broadcasting wireless signal transmitter in the single frequency network inserts Cyclic Prefix at interval as protection and falls the peak-to-average power ratio time domain discrete data sample block; the peak-to-average power ratio time domain cyclic prefix discrete data sample block falls in formation; as frame, the length of Cyclic Prefix is C.
Each digital broadcasting wireless signal transmitter in the single frequency network with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute the discrete sample block of sequence of plural training in time domain, 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 the digital broadcasting wireless signal transmitter.
The discrete sample block of the sequence of plural training that each digital broadcasting wireless signal transmitter in the single frequency network will constitute in time domain repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head.
Each digital broadcasting wireless signal transmitter in the single frequency network is that frame head is inserted into that to fall the peak-to-average power ratio time domain cyclic prefix discrete data sample block be frame with time domain repetition training series of discrete sample value piece, to form signal frame.
Each digital broadcasting wireless signal transmitter in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped.
The X of each digital broadcasting wireless signal transmitter in the single frequency network gets in 512,1024,2048; When X got 512, K got 2048, C and gets 1/4 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 4KHz; When X got 1024, K got 4096, C and gets 1/8 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 2KHz; When X got 2048, K got 8192, C and gets 1/16 of K size, and the empty frequency interval of modulating the FFT data block sub-carriers is frequently got 1KHz; Training sequence, operational indicator sequence as each digital broadcasting wireless signal transmitter in the single frequency network 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 each digital broadcasting wireless signal transmitter in the single frequency network.When X got 512, the corresponding signal to signal frame carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.1; When X got 1024, the corresponding signal to signal frame carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.05; When X got 2048, the corresponding signal to signal frame carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and gets 0.025.
Each digital broadcasting wireless signal transmitter in the single frequency network forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave.
Digital broadcasting wireless signal receiver in the single frequency network detects and receives radiofrequency signal that each digital broadcasting wireless signal transmitter in the single frequency network sends 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 the time domain and frequency domain combined alternate analysis 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, 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 (8)
1. a digital broadcasting single frequency network wireless method for transmitting signals 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 and handled to form the input data bit flow;
2) the network data management device of single frequency network will be imported data bit flow and form the FFT data block at frequency domain, and the length of FFT data block is K;
3) to adopt code check be that 1 space-frequency coding device will be modulated to each digital broadcasting wireless signal transmitter branch road in the single frequency network in the FFT data block that frequency domain forms and form and emptyly frequently modulate the FFT data block to the network data management device of single frequency network, and the time synchronized of adjusting each digital broadcasting wireless signal transmitter branch road is all modulated the FFT data block frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each digital broadcasting wireless signal transmitter in the single frequency network adopts IFFT that sky is modulated the FFT data block frequently and is transformed to the empty time domain discrete data sample block D that frequently modulates
Total
5) each digital broadcasting wireless signal transmitter in the single frequency network is modulated sky frequently time domain discrete data sample block in order and is divided equally into two, the empty sub-piece D of time domain discrete data sample that frequently modulates
1Frequently modulate the sub-piece D of time domain discrete data sample with sky
2, D
Total=[D
1, D
2];
6) each digital broadcasting wireless signal transmitter in the single frequency network is modulated the sub-piece D of time domain discrete data sample by the peak-to-average power ratio adjustment unit frequently to sky
1, the empty sub-piece D of time domain discrete data sample that frequently modulates
2Carry out that signal adds, subtracts, the operation independent of conjugation is handled or combinatorial operation is handled and the synthetic new empty time domain discrete data sample block D that frequently modulates again
New, the new empty time domain discrete data sample block D that frequently modulates
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
Relatively 12 kinds of synthetic empty frequencies of generate pattern are modulated time domain discrete data sample block D
New, choose the empty frequency of peak-to-average power ratio that falls that wherein has minimum peak-to-average power ratio and modulate time domain discrete data sample block
And the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio will be fallen
The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D
* 1Expression is modulated the sub-piece D of time domain discrete data sample frequently to sky
1Each empty modulate that time domain discrete data sample carries out that conjugate operation is handled frequently and the empty sub-piece of time domain discrete data sample of frequently modulating that obtains;
7) each digital broadcasting wireless signal transmitter in the single frequency network inserts Cyclic Prefix at interval as protection and falls the empty time domain discrete data sample block of frequently modulating of peak-to-average power ratio, the empty time domain cyclic prefix discrete data sample block of frequently modulating of peak-to-average power ratio falls in formation, as frame, the length of Cyclic Prefix is C, and falling the empty length of modulating time domain cyclic prefix discrete data sample block frequently of peak-to-average power ratio is C+K;
8) each digital broadcasting wireless signal transmitter in the single frequency network with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is arranged the set operational indicator sequence in unit as the imaginary part sequence of sequence of plural training, constitute the discrete sample block of sequence of plural training in time domain, 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 the digital broadcasting wireless signal transmitter;
9) discrete sample block of the sequence of plural training that will constitute in time domain of each digital broadcasting wireless signal transmitter in the single frequency network repeats 2 times continuously and forms time domain repetition training series of discrete sample value piece on time domain, as frame head;
10) each digital broadcasting wireless signal transmitter in the single frequency network is that frame head is inserted into and falls peak-to-average power ratio empty frequently to modulate time domain cyclic prefix discrete data sample block be frame with time domain repetition training series of discrete sample value piece, to form signal frame;
11) each digital broadcasting wireless signal transmitter in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
12) each digital broadcasting wireless signal transmitter in the single frequency network forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
13) the digital broadcasting wireless signal receiver in the single frequency network detect to receive radiofrequency signal that each digital broadcasting wireless signal transmitter in the single frequency network sends 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 digital broadcasting single frequency network wireless 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 each digital broadcasting wireless signal transmitter in the described single frequency network, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the digital broadcasting single frequency network wireless 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.
4. by the digital broadcasting single frequency network wireless method for transmitting signals of claim 2, it is characterized in that: described training sequence, operational indicator sequence have pseudo-random characteristics.
5. by the digital broadcasting single frequency network wireless method for transmitting signals of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
6. by the digital broadcasting single frequency network wireless method for transmitting signals of claim 1, it is characterized in that: described empty frequency is modulated the FFT data block and is made up of subcarrier; When X got 512, K got 2048, and the frequency interval of subcarrier is got 4KHz; When X got 1024, K got 4096, and the frequency interval of subcarrier is got 2KHz; When X got 2048, K got 8192, and the frequency interval of subcarrier is got 1KHz.
7. by the digital broadcasting single frequency network wireless 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.
8. press the digital broadcasting single frequency network wireless method for transmitting signals of claim 1, it is characterized in that: the baseband signal that described digital broadcasting single frequency network wireless signal receiver carries 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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| 王立波等.利用子块二维优化组合降低MIMO-OFDM系统峰均比.《西北工业大学学报》.2009,第27卷(第6期), |
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