CN101383803B - Digital television ground broadcast transmitter space-frequency modulation method based on embedded training sequence - Google Patents
Digital television ground broadcast transmitter space-frequency modulation method based on embedded training sequence Download PDFInfo
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- CN101383803B CN101383803B CN2008102282740A CN200810228274A CN101383803B CN 101383803 B CN101383803 B CN 101383803B CN 2008102282740 A CN2008102282740 A CN 2008102282740A CN 200810228274 A CN200810228274 A CN 200810228274A CN 101383803 B CN101383803 B CN 101383803B
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Abstract
The invention discloses a method for modulating the space-frequency of digital television terrestrial broadcasting transmitter, which is based on embedded training sequence, the method comprises: 1) forming the inputted bit stream into FFT data-blocks in the frequency field; 2) using the space-frequency encoder to modulate and adjust the time synchronization; 3) transforming the space-frequency modulated data-blocks into time-domain discrete data-block sample value blocks through the IFFT; 4) taking the training sequence as a real sequence and taking the operational indicator sequence as an imaginary-part sequence so as to construct a discrete sample value block of a plural training sequence; 5) continuously duplicating the plural training sequence for four times so as to form a time-domain embedded training sequence discrete sample block value; 6) directly overlapping the space-frequency modulated time-domain discrete data sample value block and the time-domain embedded training sequence discrete sample value block so as to form a space-frequency modulated time-domain embedded training sequence data block; 7) inserting the cyclic prefix as a protecting interval so as to form a signal frame; 8) using a square-root raised cosine roll-off filter to shape the signal frame the signal by pulse; 9) up-converting the base-band signal to a carrier wave.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of based on the digital television ground broadcast transmitter space-frequency modulation method that embeds training sequence.
Background technology
At present, ground TV broadcast develops to the digitlization direction gradually from simulation.Digital television ground broadcast transmission system, as the important component part of Digital Television Terrestrial 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 Terrestrial 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 the Digital Television Terrestrial Broadcasting correlation technique, the emphasis of various countries' concern at present is that the Digital Television Terrestrial Broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.The digital television ground broadcast transmitter modulation technique is the key technology of digital tv ground broadcasting, 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, wideband wireless local area network, Digital Television Terrestrial Broadcasting in the time of can resisting frequency selectivity and channel.
In the practical communication environment, the Digital Television Terrestrial Broadcasting communication system performance is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Transmitter modulation method is the key technology that realizes the reliable digit television terrestrial broadcasting.
Multiple antenna communication uses a plurality of (N
tIndividual) transmitting antenna and one or more (N
rIndividual) reception antenna carries out transfer of data, and it is by with N
tIndividual transmitting antenna sends different data and improves system throughput or improve the reliability of communication by send data redundantly.Transmit diversity utilizes in the space, the redundant transmission of the enterprising line data of combination of frequency, time or these dimensions, handle by simple transmit diversity, thereby the reliability that can improve the communication system data transmission makes communication system obtain stronger performance at the transmitter and receiver place.Simultaneously, 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 on same frequency) can improve the availability of frequency spectrum of digital television ground broadcast transmission system greatly.
Utilizing digital television ground 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 ground 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 digital television ground broadcast transmitter space-frequency modulation method, can satisfy the needs of single frequency network High Data Rate may command multi-service Digital Television Terrestrial Broadcasting transmission based on the embedding training sequence.
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.
M.Speth，S.Fechtel，G.Fock，and?H.Meyr.“Optimum?receiver?design?forOFDM-based?broadband?transmission-Part?II：A?case?study，”IEEE?Trans.Commun.，vol.49，pp.571-578，April?2001.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digitaltelevision?development，”Proceedings?of?the?IEEE，Special?Issue?on?GlobalDigital?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?EmergingServices，pp.37-43，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcasttechnology?for?stationary?portable?and?mobile?use，”Proceedings?of?theIEEE，Special?Issue?on?Global?Digital?Television：Technology?and?EmergingServices，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedingsof?the?IEEE，Special?Issue?on?Global?Digital?lelevision：Technology?andEmerging?Services，pp.251-256，Jan.2006.
Summary of the invention
The present invention is directed to the High Data Rate may command multi-service Digital Television Terrestrial Broadcasting problem in the single frequency network, proposed a kind of based on the digital television ground broadcast transmitter space-frequency modulation method that embeds training sequence.
What the present invention proposed is a kind of based on the digital television ground broadcast transmitter space-frequency modulation method that embeds training sequence, it is characterized in that it comprises the following steps:
1) the network data management device of single frequency network will be imported data bit flow and form the FFT data block on frequency domain, and FFT represents the fast discrete Fourier conversion, and the length numerical value of FFT data block is first-class to be K in symbol numbers;
2) to adopt code check be that FFT data block that 1 space-frequency coding device will form on frequency domain is modulated to form on each digital television ground broadcast transmitter branch road in the single frequency network and emptyly frequently modulates the FFT data block to the network data management device of single frequency network, and the time synchronized of adjusting each digital television ground broadcast 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;
3) each digital television ground broadcast transmitter in the single frequency network adopts IFFT that sky is modulated the FFT data block frequently to be transformed to and emptyly frequently to modulate time domain discrete data sample block, and IFFT represents the fast discrete Fourier inverse transformation;
4) each digital television ground broadcast 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, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and training sequence, operational indicator sequence have pseudo-random characteristics and training sequence, the operational indicator sequence has orthogonality each other;
5) each digital television ground broadcast 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, the length that time domain embeds training sequence discrete sample block is K, K=4 * X;
6) each digital television ground broadcast transmitter is modulated time domain discrete data sample block, time domain frequently with sky and is embedded training sequence discrete sample block and directly superpose and form the empty time domain of frequently modulating and embed the training sequence data piece, as frame;
7) each digital television ground broadcast transmitter at interval is that frame head inserts and emptyly frequently modulates time domain to embed the training sequence data piece be frame with Cyclic Prefix as protection, and to form signal frame, the length of Cyclic Prefix is C;
8) each transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
9) each digital television ground broadcast transmitter in the single frequency network with the baseband signal up-conversion to carrier wave.
The digital television ground broadcast transmitter space-frequency modulation method based on the embedding training sequence according to above-mentioned is characterized in that: have periodic time domain in the signal frame of digital television ground broadcast transmitter and embed training sequence discrete sample block; The length X of the training sequence of digital television ground broadcast transmitter is in 512,1024,2048, the length K of corresponding FFT data block (sub-carrier number) 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 digital television ground broadcast transmitter, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; The training sequence of digital television ground broadcast transmitter, operational indicator sequence have orthogonality each other; The different operational indicator sequence of each of digital television ground broadcast transmitter is comprising and unique each system parameters and business model information of expressing digital television ground broadcast transmitter; The code check of space-frequency coding device is 1.
Characteristics of the present invention:
The present invention is the modulation scheme that a kind of spatial domain time-domain and frequency-domain mixes.Have periodic time domain in the signal frame of digital television ground broadcast transmitter and embed training sequence discrete sample block, the training sequence of digital television ground broadcast transmitter, the operational indicator sequence has pseudo-random characteristics, the training sequence of digital television ground broadcast transmitter, the operational indicator sequence has orthogonality each other, the time domain embedding training sequence data piece of digital television ground broadcast transmitter is the discrete data sample block by time domain, time domain embeds training sequence discrete sample block and directly superposes and form, and these have guaranteed that digital television ground broadcast transmitter 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 at interval as protection embed the training sequence data piece, can reduce the interference effect between the adjacent signals frame to form signal frame.The different operational indicator sequence of each of digital television ground broadcast transmitter is comprising and unique each system parameters and business model information of expressing digital television ground broadcast transmitter, digital television ground 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.Adopt empty modulation frequently to make whole digital tv ground broadcasting obtain stronger performance.Space-frequency modulation method of the present invention have lock in time short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide the plurality of advantages such as High Data Rate may command multi-service Digital Television Terrestrial Broadcasting transmission in the single frequency network.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to the single frequency network transmitter based on the digital television ground broadcast transmitter space-frequency modulation method that embeds training sequence of the present invention.
Fig. 2 is the embodiment schematic diagram that forms signal frame based on the single frequency network transmitter of the digital television ground broadcast transmitter space-frequency modulation method that embeds training sequence according to of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
The embodiment based on the single frequency network transmitter (supposing has N transmitter in the single frequency network) of the digital television ground broadcast transmitter space-frequency modulation method that embeds training sequence according to the present invention proposes as shown in Figure 1, follows these steps to carry out:
1) the network data management device of single frequency network will be imported data bit flow and form the FFT data block on frequency domain (length of FFT data block (symbol numbers) is for K; When X gets 512, the length K of corresponding FFT data block (sub-carrier number) gets 2048, the frequency interval of corresponding subcarrier is got 4KHz when X gets 1024, and the length K of corresponding FFT data block (sub-carrier number) gets 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K of corresponding FFT data block (sub-carrier number) got 8192, and the frequency interval of corresponding subcarrier is got 1KHz);
2) to adopt code check be that FFT data block that 1 space-frequency coding device will form on frequency domain is modulated to form on each digital television ground broadcast transmitter branch road in the single frequency network and emptyly frequently modulates the FFT data block to the network data management device of single frequency network, and the time synchronized of adjusting each digital television ground broadcast 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;
3) each digital television ground broadcast transmitter in the single frequency network adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the FFT data block frequently and is transformed to the empty time domain discrete data sample block of frequently modulating;
4) each digital television ground broadcast transmitter in the single frequency network 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, (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X to the discrete sample block of formation sequence of plural training on time domain, X gets in 512,1024,2048), training sequence, operational indicator sequence have pseudo-random characteristics and training sequence, the operational indicator sequence has orthogonality each other;
5) each digital television ground broadcast transmitter in the single frequency network will repeat to form for 4 times time domain continuously in the discrete sample block of the sequence of plural training that constitutes on the time domain and embed training sequence discrete sample block (length that time domain embeds training sequence discrete sample block is K, K=4 * X) on time domain;
6) each digital television ground broadcast transmitter in the single frequency network is modulated time domain discrete data sample block, time domain frequently with sky and is embedded training sequence discrete sample block and directly superpose and form the empty time domain of frequently modulating and embed the training sequence data piece, as frame;
7) (length of Cyclic Prefix is C to each digital television ground broadcast transmitter in the single frequency network with Cyclic Prefix; When X got 512, corresponding C got 1/4 of FFT data block length K size; When X got 1024, corresponding C got 1/8 of FFT data block length K size; When X gets 2048, corresponding C get FFT data block length K size 1/16) as protection at interval (frame head) insert the empty time domain of frequently modulating and embed training sequence data piece (frame), to form signal frame;
8) each digital television ground broadcast transmitter in the single frequency network adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
9) each digital television ground broadcast transmitter in the single frequency network with the baseband signal up-conversion to carrier wave.
Form the embodiment of signal frame according to of the present invention based on the single frequency network transmitter of the digital television ground broadcast transmitter space-frequency modulation method that embeds training sequence, as shown in Figure 2, specifically implement as follows:
The network data management device of single frequency network will be imported data bit flow and form the FFT data block on frequency domain.
The FFT data block is made up of subcarrier.The length of FFT data block (symbol numbers) is K; When X got 512, the length K of corresponding FFT data block (sub-carrier number) got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, the length K of corresponding FFT data block (sub-carrier number) got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K of corresponding FFT data block (sub-carrier number) got 8192, and the frequency interval of corresponding subcarrier is got 1KHz.
It is that FFT data block that 1 space-frequency coding device will form on frequency domain is modulated to form on each digital television ground broadcast transmitter branch road in the single frequency network and emptyly frequently modulates the FFT data block that the network data management device of single frequency network adopts code check, and the time synchronized of adjusting each digital television ground broadcast 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.
Each digital television ground broadcast transmitter in the single frequency network adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated the FFT data block frequently and is transformed to the empty time domain discrete data sample block of frequently modulating.
Each digital television ground broadcast transmitter in the single frequency network 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 digital television ground broadcast 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 digital television ground broadcast transmitter.
Each digital television ground broadcast transmitter in the single frequency network is modulated time domain discrete data sample block, time domain frequently with sky and is embedded training sequence discrete sample block and directly superpose and form the empty time domain of frequently modulating and embed the training sequence data piece, as frame; Frequently modulate time domain at sky and embed and to insert Cyclic Prefix in the training sequence data 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 FFT data block length K size; When X got 1024, corresponding C got 1/8 of FFT data block length K size; When X got 2048, corresponding C got 1/16 of FFT data block length K size.
Each digital television ground broadcast transmitter in the single frequency network 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.
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 (9)
1. one kind based on the digital television ground broadcast transmitter space-frequency modulation method that embeds training sequence, and it comprises:
1) the network data management device of single frequency network will be imported data bit flow and form the FFT data block on frequency domain, and FFT represents the fast discrete Fourier conversion, and the length numerical value of FFT data block is first-class to be K in symbol numbers;
2) to adopt code check be that FFT data block that 1 space-frequency coding device will form on frequency domain is modulated to form on each digital television ground broadcast transmitter branch road in the single frequency network and emptyly frequently modulates the FFT data block to the network data management device of single frequency network, and the time synchronized of adjusting each digital television ground broadcast 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;
3) each digital television ground broadcast transmitter in the single frequency network adopts IFFT that sky is modulated the FFT data block frequently to be transformed to and emptyly frequently to modulate time domain discrete data sample block, and IFFT represents the fast discrete Fourier inverse transformation;
4) each digital television ground broadcast 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, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and training sequence, operational indicator sequence have pseudo-random characteristics and training sequence, the operational indicator sequence has orthogonality each other;
5) each digital television ground broadcast 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, the length that time domain embeds training sequence discrete sample block is K, K=4 * X;
6) each digital television ground broadcast transmitter is modulated time domain discrete data sample block, time domain frequently with sky and is embedded training sequence discrete sample block and directly superpose and form the empty time domain of frequently modulating and embed the training sequence data piece, as frame;
7) each digital television ground broadcast transmitter at interval is that frame head inserts and emptyly frequently modulates time domain to embed the training sequence data piece be frame with Cyclic Prefix as protection, and to form signal frame, the length of Cyclic Prefix is C;
8) each transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
9) each digital television ground broadcast transmitter in the single frequency network with the baseband signal up-conversion to carrier wave.
2. by the digital television ground broadcast transmitter space-frequency modulation method based on the embedding training sequence of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described digital television ground broadcast transmitter, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the digital television ground broadcast transmitter space-frequency modulation method based on the embedding training sequence of claim 2, it is characterized in that: described training sequence, operational indicator sequence have pseudo-random characteristics.
4. by the digital television ground broadcast transmitter space-frequency modulation method based on the embedding training sequence of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the digital television ground broadcast transmitter space-frequency modulation method based on the embedding training sequence of claim 1, it is characterized in that: described FFT data block is made up of subcarrier; When X got 512, sub-carrier number K got 2048; When X got 1024, sub-carrier number K got 4096; When X got 2048, sub-carrier number K got 8192.
6. by the digital television ground broadcast transmitter space-frequency modulation method based on the embedding training sequence of claim 1, it is characterized in that: described FFT data block is made up of subcarrier, and when X got 512, the frequency interval of subcarrier was got 4KHz; When X got 1024, the frequency interval of subcarrier was got 2KHz; When X got 2048, the frequency interval of subcarrier was got 1KHz.
7. by the digital television ground broadcast transmitter space-frequency modulation method based on the embedding training sequence of claim 1, it is characterized in that: described signal frame is inserted into time domain embedding training sequence data piece by Cyclic Prefix and forms.
8. by the digital television ground broadcast transmitter space-frequency modulation method based on the embedding training sequence of claim 1, it is characterized in that: the length of described 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.
By claim 1 based on the digital television ground broadcast transmitter space-frequency modulation method that embeds training sequence, it is characterized in that: described space-frequency coding device code check be 1.
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| CN101778082A (en) * | 2010-03-03 | 2010-07-14 | 宁波大学 | Wireless multi-media broadcast signal transmission method |
| CN102281242B (en) * | 2011-08-22 | 2014-03-26 | 宁波大学 | Wireless digital broadcast signal transmission method for single frequency network |
| CN102263742B (en) * | 2011-08-22 | 2013-12-11 | 宁波大学 | Robust framing modulation method for mobile multi-media broadcast signals of single frequency network |
| CN103763257A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Anti-interference transmission method for wireless digital radio signals |
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| US6771591B1 (en) * | 2000-07-31 | 2004-08-03 | Thomson Licensing S.A. | Method and system for processing orthogonal frequency division multiplexed signals |
| CN1549591A (en) * | 2003-05-19 | 2004-11-24 | 电子科技大学 | Simultaneous multi-carrier wave spread spectrum digital TV transmission system with minimum peak-level ratio |
| CN1798337A (en) * | 2004-12-30 | 2006-07-05 | 电子科技大学 | Framing method of isomorphic data in two domains in use for ground digital TV transmission system |
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| US6771591B1 (en) * | 2000-07-31 | 2004-08-03 | Thomson Licensing S.A. | Method and system for processing orthogonal frequency division multiplexed signals |
| CN1549591A (en) * | 2003-05-19 | 2004-11-24 | 电子科技大学 | Simultaneous multi-carrier wave spread spectrum digital TV transmission system with minimum peak-level ratio |
| CN1798337A (en) * | 2004-12-30 | 2006-07-05 | 电子科技大学 | Framing method of isomorphic data in two domains in use for ground digital TV transmission system |
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