CN101778082A - Wireless multi-media broadcast signal transmission method - Google Patents
Wireless multi-media broadcast signal transmission method Download PDFInfo
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Abstract
The invention discloses a wireless multi-media broadcast signal transmission method. A wireless multi-media broadcast signal is in a media data processing, and in a bit stream code element modulation and constellation revolving at the multi-media data stream of a wireless multi-media broadcast transmitter end, then a time domain discrete data sample value block is overlapped with a time domain embedded training sequence discrete sample value block to form a framing, then the wireless multi-media broadcast signal is pulsed for taking a shape, and an up-conversion is up to a carrier wave for forming a radio-frequency signal to be transmitted to an air wireless communication channel, and a receiver end receives and processes the signal transmitted by the multi-media broadcast transmitter end. The wireless multi-media broadcast signal transmission method has the advantages of short receiving synchronous time, anti-communication channel fading, controlled multi-service, and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of wireless multi-media broadcast signal transmission method.
Background technology
At present, wireless videocast develops to the digitlization direction gradually from simulation.Digital Television radio transmission system, as the important component part of Digital Television radio 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 radio 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 radio broadcasting correlation technique, the emphasis of various countries' concern at present is that the Digital Television radio broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Digital Television radio transmission technology is the key technology of Digital Television wireless 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, wideband wireless local area network, digital television broadcasting in the time of can resisting frequency selectivity and channel.
In the practical communication environment, Digital Television wireless broadcast communication systematic function is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Digital Television radio broadcasting signal transmission method is the key technology that realizes the broadcasting of reliable digit tv wireless.
Utilizing Digital Television radio 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 radio transmission of new generation system satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of wireless multi-media broadcast signal transmission method, can satisfy the needs of High Data Rate may command multi-service Digital Television radio 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?communica?tions”.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?GlobalDigi?tal?Television：Technology?and?Emerging?Service，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.Li?ss.“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?Television：Technology?andEmerging?Services，pp.251-256，Jan.2006.
X.Giraud，E.Boutillon，J.C.Belfiore.“Algebraic?tools?to?buildmodulation?schemes?for?fading?channels，”IEEE?Trans.Commun.，vol.43，pp.938-952，May.1997.
J.Boutros，E.Viterbo.“Signal?space?diversity：A?power-andbandwidth-efficient?diversity?technique?for?the?Rayleigh?fadingchannel，”IEEE?Trans.Inform.Theory，vol.44，pp.1453-1467，July.1998.
Summary of the invention
The present invention is directed to High Data Rate may command multi-service Digital Television radio transmission problem, proposed a kind of wireless multi-media broadcast signal transmission method.
A kind of wireless multi-media broadcast signal transmission method that the present invention proposes is characterized in that wireless multi-media broadcast signal is sent to the on-air radio channel and receives the signal that processing radio multimedium broadcast transmitter end is sent by receiver end through following steps at radio multimedium broadcast transmitter end:
1) radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow;
2) radio multimedium broadcast transmitter end will be imported data bit and flow through and further form FFT data block (length of FFT data block (symbol numbers) is K) after code element modulation and the constellation rotation on frequency domain;
3) radio multimedium broadcast transmitter end adopts IFFT (fast discrete Fourier inverse transformation) the FFT data block to be transformed to the discrete data sample block of time domain;
4) radio multimedium broadcast transmitter end as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitutes the discrete sample block (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X) of sequence of plural training with training sequence on time domain;
5) radio multimedium broadcast transmitter end 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) radio multimedium broadcast transmitter end embeds training sequence discrete sample block with the discrete data sample block of time domain, time domain and directly superposes and form time domain and embed the training sequence data piece, as frame;
7) radio multimedium broadcast transmitter end inserts time domain with Cyclic Prefix (length of Cyclic Prefix is C) as protection interval (frame head) and embeds training sequence data piece (frame), to form signal frame;
8) radio multimedium broadcast transmitter end adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
9) radio multimedium broadcast transmitter end forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
10) receiver end receives and handles the signal that radio multimedium broadcast transmitter end is sent.
Wireless multi-media broadcast signal transmission method according to above-mentioned is characterized in that: radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow; Have periodic time domain in the signal frame of radio multimedium broadcast transmitter end and embed training sequence discrete sample block; The length X of the training sequence of radio multimedium broadcast transmitter end 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 radio multimedium broadcast transmitter end, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of radio multimedium broadcast transmitter end have orthogonality each other; Each different operational indicator sequence of radio multimedium broadcast transmitter end is comprising and unique each system parameters and business model information of expressing the radio multimedium broadcast transmitter.The code element of radio multimedium broadcast transmitter end is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The constellation rotation angle of QPSK symbol constellations is 22.5 degree, and the constellation rotation angle of 16QAM symbol constellations is 11.25 degree, and the constellation rotation angle of 64QAM symbol constellations is 5.626 degree, and the constellation rotation angle of 256QAM symbol constellations is 2.8125 degree.
Characteristics of the present invention:
The present invention is the signal diversifying transmission plan that a kind of time-domain and frequency-domain mixes.Have periodic time domain in the signal frame of radio multimedium broadcast transmitter end and embed training sequence discrete sample block, the training sequence of radio multimedium broadcast transmitter end, the operational indicator sequence has pseudo-random characteristics, the training sequence of radio multimedium broadcast transmitter end, the operational indicator sequence has orthogonality each other, the time domain embedding training sequence data piece of radio multimedium broadcast transmitter end 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 radio multimedium broadcasting receiver end 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.Radio multimedium broadcast transmitter end inserts time domain with Cyclic Prefix at interval as protection and embeds the training sequence data piece to form signal frame, can reduce the interference effect between the adjacent signals frame.The code element modulation of radio multimedium broadcast transmitter end provides the signal diversifying effect with constellation rotation.Each different operational indicator sequence of radio multimedium broadcast transmitter end is comprising and unique each system parameters and business model information of expressing the radio multimedium broadcast transmitter, the radio multimedium 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.Wireless multi-media broadcast signal transmission method of the present invention have receive lock in time 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 radio transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to signal transmission between certain transmitter and receiver of wireless multi-media broadcast signal transmission method 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 wireless multi-media broadcast signal transmission method of the present invention.
Fig. 3 is the embodiment schematic diagram according to the constellation rotation method that the QPSK code element is modulated, the 16QAM code element is modulated of certain radio multimedium broadcast transmitter end of wireless multi-media broadcast signal transmission method of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
The embodiment of signal transmission between certain transmitter and receiver of the wireless multi-media broadcast signal transmission method that proposes according to the present invention, as shown in Figure 1, wireless multi-media broadcast signal is sent to the on-air radio channel and receives the signal that processing radio multimedium broadcast transmitter end is sent by receiver end through following steps at radio multimedium broadcast transmitter end:
1) this certain radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow;
2) this certain radio multimedium broadcast transmitter end will be imported data bit and flow through and further form the FFT data block after code element modulation and the constellation rotation on frequency domain (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);
3) this certain radio multimedium broadcast transmitter end adopts IFFT (fast discrete Fourier inverse transformation) the FFT data block to be transformed to the discrete data sample block of time domain;
4) this certain radio multimedium broadcast transmitter end 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 (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) of sequence of plural training;
5) this certain radio multimedium broadcast transmitter end 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) this certain radio multimedium broadcast transmitter end embeds training sequence discrete sample block with the discrete data sample block of time domain, time domain and directly superposes and form time domain and embed the training sequence data piece, as frame;
7) (length of Cyclic Prefix is C to this certain radio multimedium broadcast transmitter end 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 time domain and embed training sequence data piece (frame), to form signal frame;
8) this certain radio multimedium broadcast transmitter end adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
9) this certain radio multimedium broadcast transmitter end forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
10) this certain receiver end receives and handles the signal that radio multimedium broadcast transmitter end is sent.
Embodiment according to signal frame in the signals transmission between certain transmitter and receiver of wireless multi-media broadcast signal transmission method of the present invention forms, as shown in Figure 2, specifically implement as follows:
This certain radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow.
This certain radio multimedium broadcast transmitter end forms the FFT data block with the input data bit flow of oneself on frequency domain, through IFFT it is transformed to the discrete data sample block of time domain again.
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.
This certain radio multimedium broadcast transmitter end 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 radio multimedium broadcast transmitter end 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 radio multimedium broadcast transmitter end.
This certain radio multimedium broadcast transmitter end embeds training sequence discrete sample block with the discrete data sample block of time domain, time domain and directly superposes and form time domain and embed the training sequence data piece, as frame; In time domain embedding training sequence data piece, insert Cyclic Prefix 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.
This certain radio multimedium broadcast transmitter end 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 radio multimedium broadcast transmitter end forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave.
This certain receiver end receives handles the signal that radio multimedium broadcast transmitter end is sent.
The embodiment of the QPSK code element modulation of certain radio multimedium broadcast transmitter end of the wireless multi-media broadcast signal transmission method that proposes according to the present invention, the constellation rotation method of 16QAM code element modulation, the symbol constellations figure mapping mode of the QPSK code element of this certain radio multimedium broadcast transmitter end modulation as shown in Figure 3,, the modulation of 16QAM code element adopts the Gray code mapping; The constellation rotation angle of QPSK symbol constellations is 22.5 degree, and the constellation rotation angle of 16QAM symbol constellations is 11.25 degree.
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 (11)
1. wireless multi-media broadcast signal transmission method is characterized in that wireless multi-media broadcast signal is sent to the on-air radio channel and is received by receiver end through following steps at radio multimedium broadcast transmitter end to handle the signal that radio multimedium broadcast transmitter end is sent:
1) radio multimedium broadcast transmitter end converts the multi-medium data media data processor of flowing through to data bit flow;
2) radio multimedium broadcast transmitter end will be imported data bit and flow through and further form FFT data block (length of FFT data block (symbol numbers) is K) after code element modulation and the constellation rotation on frequency domain;
3) radio multimedium broadcast transmitter end adopts IFFT (fast discrete Fourier inverse transformation) the FFT data block to be transformed to the discrete data sample block of time domain;
4) radio multimedium broadcast transmitter end as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitutes the discrete sample block (length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X) of sequence of plural training with training sequence on time domain;
5) radio multimedium broadcast transmitter end 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) radio multimedium broadcast transmitter end embeds training sequence discrete sample block with the discrete data sample block of time domain, time domain and directly superposes and form time domain and embed the training sequence data piece, as frame;
7) radio multimedium broadcast transmitter end inserts time domain with Cyclic Prefix (length of Cyclic Prefix is C) as protection interval (frame head) and embeds training sequence data piece (frame), to form signal frame;
8) radio multimedium broadcast transmitter end adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
9) radio multimedium broadcast transmitter end forms emission of radio frequency signals to the on-air radio channel with the baseband signal up-conversion to carrier wave;
10) receiver end receives and handles the signal that radio multimedium broadcast transmitter end is sent.
2. by the wireless multi-media broadcast signal transmission method of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described radio multimedium broadcast transmitter end, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the wireless multi-media broadcast signal transmission method of claim 2, it is characterized in that: training sequence, the operational indicator sequence of described radio multimedium broadcast transmitter end have pseudo-random characteristics.
4. by the wireless multi-media broadcast signal transmission method of claim 2, it is characterized in that: training sequence, the operational indicator sequence of described radio multimedium broadcast transmitter end have orthogonality each other.
5. by the wireless multi-media broadcast signal transmission method of claim 1, it is characterized in that: the FFT data block of described radio multimedium broadcast transmitter end 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 wireless multi-media broadcast signal transmission method of claim 1, it is characterized in that: the FFT data block of described radio multimedium broadcast transmitter end 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 wireless multi-media broadcast signal transmission method of claim 1, it is characterized in that: the signal frame of described radio multimedium broadcast transmitter end is inserted into time domain embedding training sequence data piece by Cyclic Prefix at interval as protection and forms.
8. by the wireless multi-media broadcast signal transmission method of claim 1, it is characterized in that: described radio multimedium broadcast transmitter end adopts square root raised cosine filter that the signal pulse of signal frame is shaped.
9. by the wireless multi-media broadcast signal transmission method of claim 1, it is characterized in that: the length of the Cyclic Prefix of described radio multimedium broadcast transmitter end 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. by the wireless multi-media broadcast signal transmission method of claim 1, it is characterized in that: the code element of described radio multimedium broadcast transmitter end is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM.
11. the wireless multi-media broadcast signal transmission method by claim 10 is characterized in that: the symbol constellations figure mapping mode of the code element modulation of described radio multimedium broadcast transmitter end adopts the Gray code mapping; The constellation rotation angle of QPSK symbol constellations is 22.5 degree, and the constellation rotation angle of 16QAM symbol constellations is 11.25 degree, and the constellation rotation angle of 64QAM symbol constellations is 5.626 degree, and the constellation rotation angle of 256QAM symbol constellations is 2.8125 degree.
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| CN102255857A (en) * | 2011-08-22 | 2011-11-23 | 宁波大学 | Multimedia broadcast single-frequency network anti-fading mobile signal framing modulation method |
| CN102255863A (en) * | 2011-08-22 | 2011-11-23 | 宁波大学 | Anti-noise digital mobile broadcast signal transmitting method |
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| CN101383803A (en) * | 2008-10-27 | 2009-03-11 | 宁波大学 | Digital television ground broadcast transmitter space-frequency modulation method based on embedded training sequence |
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| US20080219379A1 (en) * | 2007-03-09 | 2008-09-11 | Rabih Chrabieh | Quadrature imbalance mitigation using unbiased training sequences |
| CN101383807A (en) * | 2008-10-27 | 2009-03-11 | 宁波大学 | Digital television ground broadcast transmitter modulation method based on embedded training sequence |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102255857A (en) * | 2011-08-22 | 2011-11-23 | 宁波大学 | Multimedia broadcast single-frequency network anti-fading mobile signal framing modulation method |
| CN102255863A (en) * | 2011-08-22 | 2011-11-23 | 宁波大学 | Anti-noise digital mobile broadcast signal transmitting method |
| CN102255857B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Multimedia broadcast single-frequency network anti-fading mobile signal framing modulation method |
| CN102255863B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Anti-noise digital mobile broadcast signal transmitting method |
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Application publication date: 20100714 |