CN101778085B - Method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network - Google Patents
Method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network Download PDFInfo
- Publication number
- CN101778085B CN101778085B CN 201010116900 CN201010116900A CN101778085B CN 101778085 B CN101778085 B CN 101778085B CN 201010116900 CN201010116900 CN 201010116900 CN 201010116900 A CN201010116900 A CN 201010116900A CN 101778085 B CN101778085 B CN 101778085B
- Authority
- CN
- China
- Prior art keywords
- sfn
- sequence
- broadcast transmitter
- signal
- time domain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
The invention discloses a method for transmitting an anti-interference wireless multi-media broadcast signal in a single frequency network. In the method, the wireless multi-media broadcast signal is transmitted to an air wireless channel by a wireless multi-media broadcast transmitter in the single frequency network through the following steps: the multimedia data streams are processed by a central data manager; a network data manager carries out multi-rate punctured convolution coding, bit interleaving, code element modulating and constellation rotation on bit streams; space-frequency coding modulation is carried out; discrete data sample value blocks in the time domain and embedded discrete sample value blocks of training sequences in the time domain are superposed to form frames; pulse shaping is carried out; up-conversion is carried out on a baseband signal to a carrier wave to form a radio-frequency signal to be transmitted to the air wireless channel; and a receiver terminal receives and processes the signal transmitted by the wireless multi-media broadcast transmitter in the single frequency network. The method has the advantages of short synchronous receipt time, environmental background interference resistance, large-range controllable multiple services in the single frequency network, etc.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network.
Background technology
At present, wireless videocast develops to the digitlization direction from simulation gradually.DTV radio transmission system, as the important component part of DTV radio broadcasting, its development of technologies, closely bound up with people's quality of life, and therefore received people's extensive concern especially.DTV 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 DTV radio broadcasting correlation technique, the emphasis of various countries' concern at present is that the DTV radio broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.DTV radio transmission technology is the key technology of DTV 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 is high, plurality of advantages such as becomes in the time of can resisting frequency selectivity and channel 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 practical communication environment, DTV wireless broadcast communication systematic function receives the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.DTV radio broadcasting signal transmission method is the key technology that realizes the broadcasting of reliable digit tv wireless.
Chnnel coding is the important component part of digital communication system.Along with the develop rapidly of modern information technologies, channel coding technology has become the indispensable technology in modern communications field.In information sequence, embed redundancy symbol, the effect of channel coding technology through redundancy symbol reduces signal and in transmission course, makes a mistake, thereby improves the reliability of communication system.
Under multidiameter fading channel, can be through coding, interweave and the optimal design of modulation scheme reaches big as far as possible signal diversifying exponent number, so that in equaling or exceeding the symbol sebolic addressing of minimum free distance, obtain independent decline.BICM technology (Bit Interleave coded modulation; Bit Interleaved Coded Modulation; BICM) adopt bit interleaver and feasible coding and modulated process relatively independent; Thereby make and to expand diversity order to different binary bits number from different multi-system symbolic numbers, that is to say that its diversity order L is the smallest hamming distance between the binary code word sequence.Because the BICM technology makes diversity order be improved significantly, therefore, make communication system under multidiameter fading channel, have good bit error performance.
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 through with N
tIndividual transmitting antenna sends different data and improves system throughput or improve the reliability of communication through send data redundantly.Transmit diversity is utilized in the redundant transmission of the enterprising line data of combination of space, frequency, time or these dimensions; Simple transmit diversity through at the transmitter and receiver place is handled, thereby the reliability that can improve the communication system data transmission makes communication system obtain stronger performance.Simultaneously, the networking model of employing SFN (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 radio multimedium broadcast transmission system greatly.
Utilizing DTV 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 DTV 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 method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network, can satisfy the needs of SFN High Data Rate may command multi-service DTV radio transmission.
Desire is done more deep understanding to the patent background can be with reference to following documents and materials:
L.J.Cimini，“Analysis?and?simulation?of?a?digital?mobile?channel?usingorthogonal?frequency?division?multiplexing，”IEEE?Trans.Commun.，vol.COM-33，pp.665-675，July?1985.
R.V.Nee，R.Prasad.“OFDM?for?wireless?mul?timedia?communications”.Boston：Artech?House，2000.
A.R.S.Bahai?and?B.R.Saltzberg.“Multi-Carrier?Digital?Communications：Theory?and?Applications?of?OFDM”.Kluwer?Academic/Plenum，1999.
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.
G.Caire，G.Taricco，E.Bigl?ieri，“Bit-interleaved?coded?modulation，”IEEE?Trans.Information?Theory，vol.44，no.3，pp.927-946，May?1998.
X.Li，A.Chindapol?and?J.A.Ritchey，“Bit-interleaved?coded?modulationwith?iterative?decoding?and?8PSK?signaling，”IEEE?Trans.Commun.，vol.50，pp.1250-1257，2002.
J.Hagenauer，“Rate-compatible?punctured?convolutional?codes?and?theirapplications，”IEEE?Trans.Commun.，vol.36，no.4，pp.389-400，April1988.
X.Li?and?J.A.Ritcey，“Bit-interleaved?coded?modulation?with?iterativedecoding，”IEEE?Commun.Lett.，vol.1，pp.169-171，Nov.1997.
A.Chindapol?and?J.A.Ritcey，“Design，analysis，and?performanceevaluation?for?BICM-ID?with?square?QAM?constellations?in?Rayleigh?fadingchannels，”IEEE?J.Select.Areas?Commun.，vol.19，no.5，pp.944-957，May?2001.
U.Wachsmann，R.Fischer，and?J.Huber，“Multilevel?codes：theoreticalconcepts?and?practical?design?rules，”IEEE?Trans.Inform.Theory，vol.45，no.5，pp.1361-1391，July?1999.
S.Benedetto，D.Divsalar，G.Montorsi，and?F.Pollara，“Serialconcatenation?of interleaved?codes：performance?analysis，design，anditerative?decoding，”IEEE?Trans.Inform.Theory，vol.44，no.3，pp.909-925，May?1998.
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 the High Data Rate may command multi-service DTV radio transmission problem in the SFN, proposed a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network.
A kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network 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 the radio multimedium broadcast transmitter of SFN:
1) the centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow;
2) the network data management device of SFN will be imported data bit and flow through and further on frequency domain, form FFT Bit Interleave coding modulation data piece (length (symbol numbers) of FFT Bit Interleave coding modulation data piece is K) after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation, constellation rotation;
3) to adopt code check be that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each radio multimedium broadcast transmitter branch road in the SFN and emptyly frequently modulates FFT Bit Interleave coding modulation data piece (empty length (symbol numbers) of modulating FFT Bit Interleave coding modulation data piece frequently is K) to the network data management device of SFN, and the time synchronized of adjusting each radio multimedium broadcast transmitter branch road is all modulated FFT Bit Interleave coding modulation data piece frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each radio multimedium broadcast transmitter in the SFN adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated FFT Bit Interleave coding modulation data piece frequently and is transformed to the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating;
5) each radio multimedium broadcast transmitter in the SFN 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;
6) each radio multimedium broadcast transmitter in the SFN 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;
7) each radio multimedium broadcast transmitter in the SFN is modulated time domain discrete Bit Interleave coding modulation data sample value piece, 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 training sequence bit interweaving encoding modulated data blocks, as frame;
8) each radio multimedium broadcast transmitter in the SFN inserts the empty time domain of frequently modulating with Cyclic Prefix (length of Cyclic Prefix is C) as protection interval (frame head) and embeds training sequence bit interweaving encoding modulated data blocks (frame), with the formation signal frame;
9) each radio multimedium broadcast transmitter in the SFN adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) each radio multimedium broadcast transmitter in the SFN is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel;
11) receiver end in the SFN receives and handles the signal that each radio multimedium broadcast transmitter in the SFN is sent.
A kind of anti-interference single frequency network wireless multimedia broadcast signal transmission method according to above-mentioned is characterized in that: the centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow; The network data management device of SFN will be imported data bit and flow through and further on frequency domain, form FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation, constellation rotation; The network data management device of SFN carries out multi code Rate of Chinese character to the input data bit flow, and to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8; The data bit of the network data management device of the SFN Bit Interleave that multi code Rate of Chinese character deletes after the surplus convolutional encoding of flowing through adopts the random interleaving mode; The data bit of the network data management device of the SFN multi code Rate of Chinese character of flowing through is deleted code element behind surplus convolutional encoding, the Bit Interleave and 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; It is that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each radio multimedium broadcast transmitter branch road in the SFN and emptyly frequently modulates FFT Bit Interleave coding modulation data piece (empty length (symbol numbers) of modulating FFT Bit Interleave coding modulation data piece frequently is K) that the network data management device of SFN adopts code check, and the time synchronized of adjusting each radio multimedium broadcast transmitter branch road is all modulated FFT Bit Interleave coding modulation data piece frequently to sky at one time and handled to guarantee all transmitters in the network; Have periodic time domain in the signal frame of each radio multimedium broadcast transmitter end in the SFN and embed training sequence discrete sample block; The length X of the training sequence of each radio multimedium broadcast transmitter end in the SFN is in 512,1024,2048; The length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece 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 Bit Interleave coding modulation data block length K size; Training sequence, the operational indicator sequence of each radio multimedium broadcast transmitter end in the SFN are formed by a series of 1 or 1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of each radio multimedium broadcast transmitter end in the SFN have orthogonality each other; Each different service index series of each radio multimedium broadcast transmitter end in the SFN is comprising and unique each system parameters and business model information of expressing the radio multimedium broadcast transmitter; The SFN receiver end receives handles the signal that each radio multimedium broadcast transmitter in the SFN is sent.
Characteristics of the present invention:
The present invention is the anti-interference signal diversifying transmission plan of SFN that a kind of spatial domain time-domain and frequency-domain mixes.The centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow; The network data management device of SFN will be imported data bit and flow through and further on frequency domain, form FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation, constellation rotation; The network data management device of SFN adopts Bit Interleave coded modulation and constellation rotation processing to improve diversity order to the input data bit flow, makes communication system under the interference environment background, have good bit error performance.It is that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each radio multimedium broadcast transmitter branch road in the SFN and emptyly frequently modulates FFT Bit Interleave coding modulation data piece (empty length (symbol numbers) of modulating FFT Bit Interleave coding modulation data piece frequently is K) that the network data management device of SFN adopts code check, and the time synchronized of adjusting each radio multimedium broadcast transmitter branch road is all modulated FFT Bit Interleave coding modulation data piece frequently to sky at one time and handled to guarantee all transmitters in the network.Have periodic time domain in the signal frame of each radio multimedium broadcast transmitter end in the SFN and embed training sequence discrete sample block; Training sequence, the operational indicator sequence of each radio multimedium broadcast transmitter end in the SFN have pseudo-random characteristics; Training sequence, the operational indicator sequence of each radio multimedium broadcast transmitter end in the SFN have orthogonality each other; It is that discrete bits interweaving encoding modulating data sample value piece, time domain by time domain embeds directly stack and forming of training sequence discrete sample block that the time domain of each radio multimedium broadcast transmitter end in the SFN embeds training sequence bit interweaving encoding modulated data blocks, and these have guaranteed that the radio multimedium broadcasting receiver end in the SFN can realize fast and accurately frame synchronization, Frequency Synchronization, time synchronized, channel transfer characteristic estimation and phase noise and channel transfer characteristic are reliably followed the tracks of.Each radio multimedium broadcast transmitter end in the SFN inserts time domain with Cyclic Prefix at interval as protection and embeds training sequence bit interweaving encoding modulated data blocks to form signal frame, can reduce the interference effect between the adjacent signals frame.Each different service index series of each radio multimedium broadcast transmitter end in the SFN is comprising and unique each system parameters and business model information of expressing the single frequency network wireless multimedia 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.The SFN receiver end receives handles the signal that each radio multimedium broadcast transmitter in the SFN is sent.A kind of anti-interference single frequency network wireless multimedia broadcast signal transmission method of the present invention have receive lock in time short, clock jitter is little, anti-single frequency network wireless multimedia broadcast transmitted environmental background disturbs, plurality of advantages such as large-scale SFN High Data Rate may command multi-service DTV radio transmission can be provided.
Description of drawings
Fig. 1 is the embodiment sketch map according to signal transmission between the transmitter and receiver of a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network of the present invention.
Fig. 2 is the embodiment sketch map that forms according to signal frame in the signals transmission between the transmitter and receiver of a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network of the present invention.
Fig. 3 is the embodiment sketch map according to the constellation rotation method that the QPSK code element is modulated, the 16QAM code element is modulated of the radio multimedium broadcast transmitter end of a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network of the present invention.
Embodiment
To combine accompanying drawing that specific embodiment of the present invention is described in detail below.
The embodiment of signal transmission (supposing has N transmitter in the SFN) between the transmitter and receiver of a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network 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 the radio multimedium broadcast transmitter end of SFN:
1) the centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow;
2) the network data management device of SFN will be imported the data bit multi code Rate of Chinese character of flowing through and delete surplus convolutional encoding (the network data management device of SFN carries out multi code Rate of Chinese character to the input data bit flow, and to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8), Bit Interleave (data bit of the network data management device of SFN flow through the Bit Interleave that multi code Rate of Chinese character deletes after the surplus convolutional encoding adopt the random interleaving mode), code element modulation (data bit of the network data management device of the SFN multi code Rate of Chinese character of flowing through is deleted code element behind surplus convolutional encoding, the Bit Interleave and is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM; The mapping of symbol constellations figure mapping mode employing Gray code), (the constellation rotation angle of QPSK symbol constellations is 22.5 degree to constellation rotation; The constellation rotation angle of 16QAM symbol constellations is 11.25 degree; 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) after further on frequency domain, form FFT Bit Interleave coding modulation data piece (length (symbol numbers) of FFT Bit Interleave coding modulation data piece be K; When X got 512, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 8192, and the frequency interval of corresponding subcarrier is got 1KHz);
3) to adopt code check be that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each radio multimedium broadcast transmitter branch road in the SFN and emptyly frequently modulates FFT Bit Interleave coding modulation data piece (empty length (symbol numbers) of modulating FFT Bit Interleave coding modulation data piece frequently is K) to the network data management device of SFN, and the time synchronized of adjusting each radio multimedium broadcast transmitter branch road is all modulated FFT Bit Interleave coding modulation data piece frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each radio multimedium broadcast transmitter in the SFN adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated FFT Bit Interleave coding modulation data piece frequently and is transformed to the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating;
5) each radio multimedium broadcast transmitter in the SFN 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;
6) each radio multimedium broadcast transmitter in the SFN 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;
7) each radio multimedium broadcast transmitter in the SFN is modulated time domain discrete Bit Interleave coding modulation data sample value piece, 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 training sequence bit interweaving encoding modulated data blocks, as frame;
8) (length of Cyclic Prefix is C to each radio multimedium broadcast transmitter in the SFN with Cyclic Prefix; When X got 512, corresponding C got 1/4 of FFT Bit Interleave coding modulation data block length K size; When X got 1024, corresponding C got 1/8 of FFT Bit Interleave coding modulation data block length K size; When X gets 2048, corresponding C get FFT Bit Interleave coding modulation 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 bit interweaving encoding modulated data blocks (frame), to form signal frame;
9) each radio multimedium broadcast transmitter in the SFN adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) each radio multimedium broadcast transmitter in the SFN is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel;
11) receiver end in the SFN receives and handles the signal that each radio multimedium broadcast transmitter in the SFN is sent.
According to the embodiment of signal frame formation (supposing has N transmitter in the SFN) in the signals transmission between the transmitter and receiver of a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network of the present invention, as shown in Figure 2, practical implementation is following:
The centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow.
The network data management device of SFN will be imported data bit and flow through and further on frequency domain, form FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation, constellation rotation.
The FFT Bit Interleave coding modulation data piece of each radio multimedium broadcast transmitter in the SFN is made up of subcarrier.The length (symbol numbers) of FFT Bit Interleave coding modulation data piece is K; When X got 512, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X got 1024, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X got 2048, the length K (sub-carrier number) of corresponding FFT Bit Interleave coding modulation data piece got 8192, and the frequency interval of corresponding subcarrier is got 1KHz.
It is that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each radio multimedium broadcast transmitter branch road in the SFN and emptyly frequently modulates FFT Bit Interleave coding modulation data piece that the network data management device of SFN adopts code check, and the time synchronized of adjusting each radio multimedium broadcast transmitter branch road is all modulated FFT Bit Interleave coding modulation data piece frequently to sky at one time and handled to guarantee all transmitters in the network.
Each radio multimedium broadcast transmitter in the SFN adopts IFFT (fast discrete Fourier inverse transformation) that sky is modulated FFT Bit Interleave coding modulation data piece frequently and is transformed to the empty time domain discrete Bit Interleave coding modulation data sample value piece of frequently modulating.
Each radio multimedium broadcast transmitter in the SFN 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 the training sequence of each radio multimedium broadcast transmitter in the SFN, operational indicator sequence, sequence of plural training all is X; X gets in 512,1024,2048; The length that time domain embeds training sequence discrete sample block is K, K=4 * X.
Training sequence, operational indicator sequence as each radio multimedium broadcast transmitter in the SFN 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 characteristic 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 service index series of each radio multimedium broadcast transmitter in the SFN is comprising and unique each system parameters and business model information of expressing each radio multimedium broadcast transmitter in the SFN.
Each radio multimedium broadcast transmitter in the SFN is modulated time domain discrete Bit Interleave coding modulation data sample value piece, 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 training sequence bit interweaving encoding modulated data blocks, as frame; Frequently modulate time domain at sky and embed in the training sequence bit interweaving encoding modulated data blocks and insert Cyclic Prefix at interval, form signal frame as protection.
The length of the conduct protection Cyclic Prefix at interval of each radio multimedium broadcast transmitter in the SFN is C; When X got 512, corresponding C got 1/4 of FFT Bit Interleave coding modulation data block length K size; When X got 1024, corresponding C got 1/8 of FFT Bit Interleave coding modulation data block length K size; When X got 2048, corresponding C got 1/16 of FFT Bit Interleave coding modulation data block length K size.
Each radio multimedium broadcast transmitter in the SFN 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.
Each radio multimedium broadcast transmitter in the SFN is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel.
Receiver end in the SFN receives handles the signal that each radio multimedium broadcast transmitter in the SFN is sent.
The embodiment of the QPSK code element modulation of the radio multimedium broadcast transmitter end of a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network that proposes according to the present invention, the constellation rotation method of 16QAM code element modulation; As shown in Figure 3, the QPSK code element modulation of radio multimedium broadcast transmitter end, the symbol constellations figure mapping mode of 16QAM code element modulation adopt 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.
Combine accompanying drawing that specific embodiment of the present invention is specified 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 (4)
1. method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network 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 the radio multimedium broadcast transmitter of SFN to handle the signal that radio multimedium broadcast transmitter end is sent:
1) the centre data manager of SFN converts the multi-medium data media data processor of flowing through to data bit flow;
2) the network data management device of SFN will be imported data bit and flow through and further on frequency domain, form FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation, constellation rotation; Code element is modulated to a kind of among QPSK, 16QAM, 64QAM, the 256QAM; The symbol constellations figure mapping mode of code element modulation adopts the Gray code mapping; The constellation rotation angle of QPSK symbol constellations is 22.5 degree; 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; FFT representes the fast discrete Fourier conversion, and the length of FFT Bit Interleave coding modulation data piece is K;
3) to adopt code check be that FFT Bit Interleave coding modulation data piece that 1 space-frequency coding device will form on frequency domain is modulated to form on each radio multimedium broadcast transmitter branch road in the SFN and emptyly frequently modulates FFT Bit Interleave coding modulation data piece to the network data management device of SFN, and the time synchronized of adjusting each radio multimedium broadcast transmitter branch road is all modulated FFT Bit Interleave coding modulation data piece frequently to sky at one time and handled to guarantee all transmitters in the network;
4) each radio multimedium broadcast transmitter in the SFN adopts IFFT that sky is modulated FFT Bit Interleave coding modulation data piece frequently to be transformed to and emptyly frequently to modulate time domain discrete Bit Interleave coding modulation data sample value piece, and IFFT representes the fast discrete Fourier inverse transformation;
5) each radio multimedium broadcast transmitter in the SFN 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;
6) each radio multimedium broadcast transmitter in the SFN 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, and the length that time domain embeds training sequence discrete sample block is 4 * X;
7) each radio multimedium broadcast transmitter in the SFN is modulated time domain discrete Bit Interleave coding modulation data sample value piece, 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 training sequence bit interweaving encoding modulated data blocks, as frame;
8) each radio multimedium broadcast transmitter in the SFN at interval is that frame head inserts and emptyly frequently modulates time domain to embed training sequence bit interweaving encoding modulated data blocks be frame with Cyclic Prefix as protection, and to form signal frame, the length of Cyclic Prefix is C;
9) each radio multimedium broadcast transmitter in the SFN adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
10) each radio multimedium broadcast transmitter in the SFN is with forming emission of radio frequency signals on baseband signal up-conversion to the carrier wave to the on-air radio channel;
11) receiver end in the SFN receives and handles the signal that each radio multimedium broadcast transmitter in the SFN is sent.
2. by a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network of claim 1, it is characterized in that: the network data management device of said SFN carries out multi code Rate of Chinese character to the input data bit flow, and to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8.
3. by a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network of claim 1, it is characterized in that: the data bit of the network data management device of the said SFN Bit Interleave that multi code Rate of Chinese character deletes after the surplus convolutional encoding of flowing through adopts the random interleaving mode
4. press a kind of method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network of claim 1; It is characterized in that: training sequence, the operational indicator sequence of each radio multimedium broadcast transmitter in the said SFN have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010116900 CN101778085B (en) | 2010-03-03 | 2010-03-03 | Method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010116900 CN101778085B (en) | 2010-03-03 | 2010-03-03 | Method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101778085A CN101778085A (en) | 2010-07-14 |
| CN101778085B true CN101778085B (en) | 2012-10-03 |
Family
ID=42514416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010116900 Expired - Fee Related CN101778085B (en) | 2010-03-03 | 2010-03-03 | Method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101778085B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263743B (en) * | 2011-08-22 | 2013-11-06 | 宁波大学 | Anti-interference mobile multimedia broadcast signal framing modulation method for single-frequency network |
| CN102281235B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Anti-interference method for modulating mobile multimedia broadcast signal by framing |
| CN102307169B (en) * | 2011-08-22 | 2013-09-25 | 宁波大学 | Multimedia broadcast wireless signal noise-immune framing modulation method |
| CN102307170B (en) * | 2011-08-22 | 2013-09-25 | 宁波大学 | Anti-interference wireless multimedia mobile broadcast signal framing modulation method |
| CN102281241B (en) * | 2011-08-22 | 2014-03-26 | 宁波大学 | Multimedia mobile broadcast signal framing modulation method |
| CN102307171B (en) * | 2011-08-22 | 2013-10-16 | 宁波大学 | Anti-interference wireless multimedia broadcast signal framing modulation method |
| CN102244638A (en) * | 2011-08-22 | 2011-11-16 | 宁波大学 | Anti-interference wireless multimedia broadcast signal framing modulation method for single frequency network |
| CN102281244B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Anti-interference wireless digital broadcast signal transmission method for single frequency network |
| CN102281239B (en) * | 2011-08-22 | 2014-03-26 | 宁波大学 | Anti-interference multimedia mobile broadcast signal framing modulation method |
| CN103780537A (en) * | 2014-01-13 | 2014-05-07 | 宁波大学 | Wireless signal anti-noise framing modulation method in multimedia broadcasting |
| CN103780546A (en) * | 2014-01-13 | 2014-05-07 | 宁波大学 | Single-frequency network anti-fading wireless multimedia broadcasting signal framing modulation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383809A (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 and BICM |
| CN101394392A (en) * | 2008-11-12 | 2009-03-25 | 北京邮电大学 | Signal diversifying method for OFDM system |
-
2010
- 2010-03-03 CN CN 201010116900 patent/CN101778085B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383809A (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 and BICM |
| CN101394392A (en) * | 2008-11-12 | 2009-03-25 | 北京邮电大学 | Signal diversifying method for OFDM system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101778085A (en) | 2010-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101778084B (en) | Method for transmitting anti-fading wireless multi-media broadcast signal in single frequency network | |
| CN101778085B (en) | Method for transmitting anti-interference wireless multi-media broadcast signal in single frequency network | |
| CN101778078B (en) | Anti-jamming wireless multimedia broadcasting signal transmission method | |
| CN101778073B (en) | Multimedia broadcast wireless signal single-frequency network anti-fading transmission method | |
| CN101420410B (en) | Interference resistant modulation method for digital television terrestrial broadcast transmitter | |
| CN101815050B (en) | Multimedia broadcasting wireless signal single-frequency network anti-jamming transmission method | |
| CN101431503B (en) | Space-frequency modulation method for digital television ground broadcasting transmitter | |
| CN101778087B (en) | Method for transmitting robust wireless multi-media broadcast signal in single frequency network | |
| CN101778079B (en) | Multimedia broadcast wireless signal anti-jamming transmission method | |
| CN101383804B (en) | Digital television ground broadcast transmitter modulation method having time-domain training sequence and BICM | |
| CN101778081B (en) | Single frequency network wireless multimedia broadcast signal transmission method | |
| CN101383809B (en) | Digital television ground broadcast transmitter space-frequency modulation method based on embedded training sequence and BICM | |
| CN101345733B (en) | Multi-user OFDM Modulation Method Based on Embedded Training Sequence and BICM | |
| CN101383808B (en) | Digital television ground broadcast transmitter modulation method based on embedded training sequence and BICM | |
| CN102255699A (en) | Method for framing and modulating anti-fading wireless multimedia broadcast signals | |
| CN102271116A (en) | Anti-fading multimedia wireless broadcast signal framing modulation method | |
| CN101431504B (en) | Space-frequency modulation method for high-performance digital television ground broadcast transmitter | |
| CN102271117B (en) | Anti-interference multimedia wireless broadcast signal framing modulation method | |
| CN102271111B (en) | Anti-fading mobile multimedia broadcasting signal framing modulation method | |
| CN102394852A (en) | Single-frequency network anti-fading wireless multimedia broadcasting signal framing modulation method | |
| CN102281246B (en) | Anti-fading method for transmitting wireless digital broadcast signal in single frequency network | |
| CN102255860B (en) | Anti-interference digital mobile broadcasting signal transmission method | |
| CN102263741B (en) | Method for framing and modulating anti-fading mobile multimedia broadcasting signal of single frequency network | |
| CN102281239B (en) | Anti-interference multimedia mobile broadcast signal framing modulation method | |
| CN101815052B (en) | Multimedia broadcast wireless signal single frequency network transmission method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20150303 |
|
| EXPY | Termination of patent right or utility model |