CN102957635B - Based on digital broadband communication means and the system of information block transmission - Google Patents
Based on digital broadband communication means and the system of information block transmission Download PDFInfo
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- CN102957635B CN102957635B CN201110237064.XA CN201110237064A CN102957635B CN 102957635 B CN102957635 B CN 102957635B CN 201110237064 A CN201110237064 A CN 201110237064A CN 102957635 B CN102957635 B CN 102957635B
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Abstract
The present invention relates to field of signal transmissions, disclose a kind of digital broadband communication means based on information block transmission and system.The present invention is that elementary cell is transmitted with signal frame, and signal frame is made up of signal frame head and body data two parts, and wherein frame head is one section of known training sequence.By carrying out time-frequency conversion to the training sequence generated, two groups of inter-related training sequences can be obtained, and two groups of training sequences are alternately inserted in adjacent signals frame as preamble sequence.Receiving terminal then can utilize the training sequence of adjacent signals frame to carry out channel estimating and equilibrium flexibly.The method can adapt to single carrier transmission mode or multicarrier transmission mode, can compatible with single custom system or multi-user system, effectively can improve the flexibility of system, improve precision and the adaptability of channel estimating and equilibrium, reduce the implementation complexity of system.
Description
Technical field
The present invention relates to field of signal transmissions, particularly relate to a kind of digital broadband communication means based on information block transmission and system.
Background technology
Along with growing to radio communication service demand of the develop rapidly of modern communication technology and people, user wishes to receive any interested various service anywhere or anytime, as Video service, audio service, data, services, etc.Therefore, various digital signal transmission all for can provide in effective bandwidth higher transmission rate, can under various complicated transmission environment reliably working, can adapt to various different business flexible demands and take various effective process means.Comprising list/multi-transceiver technology, coding modulation technique, simultaneous techniques and channel estimation and equalization technology etc.
Broad band wireless transmission, because the physical channel situation of its transmission information is complicated and changeable, therefore its greatest problem faced is, signal transmission is under multipath channel, meeting occurrence frequency selectivity and time selective fading, and cause serious intersymbol interference (InterSymbolInterference, ISI).In digital signal transmission system, employing balancing technique resists the non-ideal transmission factor that channel brings usually, such as traditional single carrier wave time domain equalizer, and the multicarrier frequency-domain equalization technology etc. be widely used at present.When carrying out channel equalization, receiving terminal needs effectively to estimate the characteristic information of transmission channel, thus directed equalizer compensates the characteristic of channel.Therefore, need to extract transmitting channel information from Received signal strength, help receiving terminal restoring signal.A kind of effective means introduce known auxiliary data in the transmission signal.Although adding of auxiliary data reduces efficiency of transmission, it directly determines the channel estimation ability that system is eliminated ISI and followed the tracks of the aspects such as dynamics of channels change.Simultaneously auxiliary data can also be used for comprising that signal is synchronous, transmission mode identification and follow the tracks of the functions such as phase noise.
Terrestrial wireless digital television transfer technology is the important component part in current Wideband Wireless Digital Communication field.In the terrestrial DTV transmission standard existed in the world, United States advanced television systems committee (AdvancedTelevisionSystemsCommittee, ATSC) digital television standard have employed single-carrier modulated; European terrestrial digital video broadcasting (DigitalVideoBroadcasting-Terrestrial, DVB-T) standard, Japanese Terrestrial Integrated Services Digital Broadcasting (IntegratedServiceDigitalBroadcasting-Terrestrial, ISDB-T), and China Digital TV national standard (DigitalTelevisionMultimediaBroadcast, DTMB) all have employed the multi-carrier modulation based on OFDM (OrthogonalFrequencyDivisionMultiplexing, OFDM) technology.The serial data stream of original high speed to be converted into the parallel data stream of low speed due to it by multi-transceiver technology, thus significantly improves the symbol period of signal, can contrary frequency Selective intensity effectively.As shown in Figure 1, each signal frame is divided the concept in order to field and section by ATSC single-carrier system, and 312 data segments and 1 field synchronization segments are contained in each field.Be illustrated in figure 2 the Multi-Carriers system configuration of DVB-T, wherein adopt the OFDM (CodedOrthogonalFrequencyDivisionMultiplexing of coding, COFDM) transmit, radom insertion pilot signal, mainly be divided into continuous pilot and scattered pilot two kinds, object transmits the parameter of transmitting terminal agreement or the characteristic of test channel by the data in pilot tone.
Different from the OFDM technology that DVB-T adopts, Chinese DTMB system have employed the time-domain synchronization OFDM technology (TimeDomainSynchronous-OrthogonalFrequencyDivisionMultipl exing, TDS-OFDM) of original creation.In TDS-OFDM system, known pseudo random sequence (Pseudo-randomNoise, PN) instead of Cyclic Prefix in OFDM and for time synchronized, Frequency Synchronization and channel estimating.Known training sequence playing protection interval action when resisting inter-block-interference while, can also assist and carry out synchronous, Timed Recovery, carrier auxiliary, channel estimating and noise estimation etc.
In existing TDS-OFDM system, interfere with each other owing to existing under multipath channel between training sequence and body data, therefore need to adopt complicated signal processing method to eliminate PN to the interference of data and data to the interference of PN, thus add the implementation complexity of system, and penalty can be brought when adopting the constellation mapping mode of more high-order.Therefore, how to design more efficiently frame structure, make system can meet the requirement of efficiency of transmission, can bring simple implementation efficiently for the signal transacting of receiving terminal again, the transmission performance of raising system becomes a key problem of system further simultaneously.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how to provide a kind of the digital broadband communication means and the system that are applicable to multicarrier transmission systems or single carrier transmitting system, to improve the availability of frequency spectrum of system, improves the transmission performance of system under multipath channel.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of digital broadband communication means based on information block transmission, the method comprising the steps of:
S1, generates known training sequence, as training sequence C
1;
S2, by training sequence C
1through time-frequency conversion, obtain training sequence C
2;
S3, modulates transmission information according to predetermined modulation system, then divides into groups according to the body data length preset, forms body data waiting for transmission;
S4, by obtained training sequence C
1with training sequence C
2carry out multiple connection according to predetermined rule and body data, form signal frame;
S5, by the signal frame obtained by sending after reprocessing.
Wherein, training sequence C is obtained by time-frequency conversion in step S2
2mode be: by training sequence C
1subsequence A and B of former and later two equal lengths is divided in time domain; Then the order of subsequence A and B exchanged in time domain, the new sequence obtained is training sequence C
2.
Wherein, the modulation system of described regulation is single-carrier modulated mode or multi-carrier modulation.
Wherein, carrying out the rule that multiple connection forms signal frame in step S4 with body data is: by the training sequence C obtained
1with training sequence C
2before being alternately inserted into described body data.
Wherein, described training sequence C
1and C
2for the one in time domain binary sequence, frequency domain binary sequence and time-frequency sequence of real numbers, or the distortion of these three kinds of sequences or combination.
Wherein, also comprise the step that receiving terminal carries out channel estimating after step s 5, specifically comprise step:
S61, isolates header signal and frame signal from the signal received;
S62, combines the latter half of training sequence in the latter half of training sequence in current demand signal frame and next signal frame, and reconstruct obtains new received training sequence;
S63, utilizes the header signal of current demand signal frame to estimate transmission channel characteristic;
S64, the new received training sequence utilizing reconstruct to obtain is estimated transmission channel characteristic;
S65, the channel estimation results utilizing frame signal and step S63 and S64 to export carries out channel compensation to the received signal;
S66, the modulation system according to presetting carries out demodulation to the signal obtained after channel compensation, recovers original transmission data.
Present invention also offers a kind of digital broadband communication system based on information block transmission, comprising:
Training sequence generation module, for generating known training sequence, as training sequence C
1;
Training sequence time frequency processing module, for by training sequence C
1through time-frequency conversion, obtain training sequence C
2;
Body data generation module, for being modulated according to predetermined modulation system by transmission information, then dividing into groups according to the body data length preset, forming body data waiting for transmission;
Signal frame generation module, for by obtained training sequence C
1with training sequence C
2carry out multiple connection according to predetermined rule and body data, form signal frame;
Post-processing module, for by the signal frame obtained by sending after reprocessing.
Wherein, described system also comprises receiving terminal, and receiving terminal specifically comprises:
Frame head and body data separation module, for isolating header signal and frame signal from the signal received;
Preamble sequence reconstructed module, for being combined by the latter half of training sequence in the latter half of training sequence in current demand signal frame and next signal frame, reconstruct obtains new received training sequence;
First channel estimation module, estimates transmission channel characteristic for utilizing the header signal of current demand signal frame;
Second channel estimation module, estimates transmission channel characteristic for the new received training sequence utilizing reconstruct to obtain;
Channel equalization module, carries out channel compensation to the received signal for the channel estimation results utilizing frame signal and the first channel estimation module and second channel estimation module to export;
Data demodulation module, for carrying out demodulation according to the modulation system preset to the signal that channel equalization module exports, recovers original transmission data.
(3) beneficial effect
The present invention adopts the known training sequence of compatible multiple sequence form to replace Cyclic Prefix, the expense of pilot tone can be saved while effectively avoiding intersymbol interference, improve the availability of frequency spectrum of system, improve the transmission performance of system under multipath channel.The present invention can adapt to single carrier transmission and multi-carrier transmission system, adds flexibility and the adaptability of system application.Insert rule by designed training sequence, system can compatible multiple channel estimating and equalization methods, can obtain the effective and reasonable distribution of performance and complexity under different transmission environment.
Accompanying drawing explanation
Fig. 1 is the digital signal transmission method schematic diagram of U.S. ATSC;
Fig. 2 is the digital signal transmission method schematic diagram of European DVB-T;
Fig. 3 is signal frame structure schematic diagram provided by the invention;
Fig. 4 is that training sequence provided by the invention inserts regular schematic diagram;
Fig. 5 is the flow chart of method for transmitting signals of the present invention;
Fig. 6 is the transmitting terminal system block diagram of the block transmission method of digital signal according to one embodiment of this invention;
Fig. 7 is according to a kind of receiving terminal channel estimation methods of the present invention;
Fig. 8 is the receiving terminal system block diagram of the block transmission method of digital signal according to one embodiment of this invention.
Embodiment
The block transmission method of the digital signal that the present invention proposes and system, be described as follows in conjunction with the accompanying drawings and embodiments.
With reference to figure 3 ~ Fig. 5, according to the block transmission method flow chart of the digital signal of one embodiment of this invention, the method take signal frame as Basic Transmission Unit, and signal frame is made up of frame head and frame two parts, and the method comprising the steps of:
S1. generate known training sequence, obtain training sequence C
1;
S2. by training sequence C
1through time-frequency conversion, obtain training sequence C
2; Training sequence C
1and C
2for the one in time domain binary sequence, frequency domain binary sequence and time-frequency sequence of real numbers, or the distortion of these three kinds of sequences or combination;
S3. transmission information is carried out modulating and dividing into groups according to the modulation system preset and body data length, form body data waiting for transmission; Described default modulation system is single-carrier modulated mode or multi-carrier modulation;
S4. by obtained training sequence C
1with training sequence C
2carry out multiple connection according to the rule preset and body data, form signal frame;
S5. by the signal frame obtained by sending after reprocessing.
The known training sequence C of above-mentioned length-specific
1and C
2composition frame head.Although present invention employs two groups of training sequences, be not have nothing to do each other between two groups of training sequences, but there are specific time-frequency mapping relations.As shown in Figure 5, the corresponding relation of two groups of training sequences in time domain is: by training sequence C
1subsequence A and B of former and later two equal lengths is divided in time domain; The order of A and B exchanged in time domain, the new sequence definition obtained is C
2.If C
1can be expressed as in time domain
wherein N is training sequence length, and T represents transposition, then C
1frequency domain representation be
and
can be obtained by corresponding relation above, sequence C
2frequency-region signal can be expressed as:
Above formula clearly reflects the corresponding relation at frequency domain between two groups of training sequences.
According to the present invention, comprising two kinds of preamble sequence in the signal frame transmitted, is training sequence C respectively
1with training sequence C
2, as shown in Figure 4, and before two groups of training sequences are alternately inserted into body data.Then, if the training sequence before l signal frame is C
i, i=1 or 2, then the training sequence before (l+1) individual frame is C
mod (i, 2)+1, wherein, mod (i, 2) expression carries out Modulo-two operation to i.Meanwhile, in order to channel estimating is easier, the length of frame can be selected further to be the integral multiple of frame head length.
Figure 6 shows that the transmitting terminal system block diagram according to the digital carrier system designed by the present invention.Comprise:
Training sequence generation module 101, for generating known training sequence, i.e. training sequence C
1;
Time frequency processing module 102, for by sequence C
1carry out time domain conversion and generate training sequence C
2;
Body data generation module 103, for transmission information modulation system according to the rules being modulated, and dividing into groups according to selected body data length, forming body data block waiting for transmission;
Signal frame generation module 104, for by obtained training sequence C
1with training sequence C
2carry out multiple connection according to predetermined rule and body data, form signal frame;
Post-processing module 105, for by the signal frame obtained by sending after the reprocessing such as shaping filter and quadrature up-conversion.
Figure 7 shows that according to a kind of receiving terminal channel estimation methods schematic diagram of the present invention.Shades different in figure represents the delay spread of different piece under multipath channel in signal frame respectively.Can clearly find out from Fig. 7, due to the relationship between frequency and time of training sequence between adjacent two signal frames, the latter half B of current training sequence and the latter half A of next training sequence is combined and just constitutes sequence C
2circular convolution form between (i.e. BA) and multipath channel impulse response.Therefore can utilize this feature of the present invention, utilize at receiving terminal the advantage that circular convolution precision of channel estimation is high, obtain channel estimation results more accurately, thus improve the receptivity of system.
According to digital data transmission mode provided by the present invention, Fig. 8 gives the system block diagram that receiving terminal carries out processing to received signal.Comprise:
Body data separation module 201, for being separated with frame signal by frame head in the signal received, is received header signal and frame signal accordingly;
Preamble sequence reconstructed module 202, for being combined by the latter half of preamble sequence in the latter half of preamble sequence in current demand signal frame and next signal frame, thus reconstructs the received training sequence made new advances; Preamble sequence before reconstruct, directly through the first channel estimation module 203, obtains one group of channel estimation results; Meanwhile, reconstruct the received training sequence obtained and obtain another group channel estimation results through second channel estimation module 204;
Channel equalization module 205, the frame signal obtained for utilizing separation and two groups of channel estimation results carry out channel compensation process, to received signal to eliminate the impact of multipath channel on signal transmission;
Data demodulation module 206, carries out demodulation for signal channel equalization module 205 exported, and obtains original transmission data, thus completes the recovery of transmission information.
Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (6)
1., based on a digital broadband communication means for information block transmission, it is characterized in that, the method comprising the steps of:
S1, generates known training sequence, as training sequence C
1;
S2, by training sequence C
1through time-frequency conversion, obtain training sequence C
2;
S3, modulates transmission information according to predetermined modulation system, then divides into groups according to the body data length preset, forms body data waiting for transmission;
S4, by obtained training sequence C
1with training sequence C
2carry out multiple connection according to predetermined rule and body data, form signal frame;
S5, by the signal frame obtained by sending after reprocessing;
Wherein, carrying out the rule that multiple connection forms signal frame in step S4 with body data is: by the training sequence C obtained
1with training sequence C
2before being alternately inserted into described body data;
Training sequence C is obtained by time-frequency conversion in step S2
2mode be: by training sequence C
1subsequence A and B of former and later two equal lengths is divided in time domain; Then the order of subsequence A and B exchanged in time domain, the new sequence obtained is training sequence C
2.
2. the method for claim 1, is characterized in that, the modulation system of described regulation is single-carrier modulated mode or multi-carrier modulation.
3. the method for claim 1, is characterized in that, described training sequence C
1and C
2for the one in time domain binary sequence, frequency domain binary sequence and time-frequency sequence of real numbers, or the distortion of these three kinds of sequences or combination.
4. the method for claim 1, is characterized in that, also comprises the step that receiving terminal carries out channel estimating after step s 5, specifically comprises step:
S61, isolates header signal and frame signal from the signal received;
S62, combines the latter half of training sequence in the latter half of training sequence in current demand signal frame and next signal frame, and reconstruct obtains new received training sequence;
S63, utilizes the header signal of current demand signal frame to estimate transmission channel characteristic;
S64, the new received training sequence utilizing reconstruct to obtain is estimated transmission channel characteristic;
S65, the channel estimation results utilizing frame signal and step S63 and S64 to export carries out channel compensation to the received signal;
S66, the modulation system according to presetting carries out demodulation to the signal obtained after channel compensation, recovers original transmission data.
5., based on a digital broadband communication system for information block transmission, it is characterized in that, comprising:
Training sequence generation module, for generating known training sequence, as training sequence C
1;
Training sequence time frequency processing module, for by training sequence C
1through time-frequency conversion, obtain training sequence C
2;
Body data generation module, for being modulated according to predetermined modulation system by transmission information, then dividing into groups according to the body data length preset, forming body data waiting for transmission;
Signal frame generation module, for by obtained training sequence C
1with training sequence C
2carry out multiple connection according to predetermined rule and body data, form signal frame;
Post-processing module, for by the signal frame obtained by sending after reprocessing;
Wherein, the rule forming signal frame in described signal frame generation module is: by the training sequence C obtained
1with training sequence C
2before being alternately inserted into described body data.
6. system as claimed in claim 5, it is characterized in that, described system also comprises receiving terminal, and receiving terminal specifically comprises:
Frame head and body data separation module, for isolating header signal and frame signal from the signal received;
Preamble sequence reconstructed module, for being combined by the latter half of training sequence in the latter half of training sequence in current demand signal frame and next signal frame, reconstruct obtains new received training sequence;
First channel estimation module, estimates transmission channel characteristic for utilizing the header signal of current demand signal frame;
Second channel estimation module, estimates transmission channel characteristic for the new received training sequence utilizing reconstruct to obtain;
Channel equalization module, carries out channel compensation to the received signal for the channel estimation results utilizing frame signal and the first channel estimation module and second channel estimation module to export;
Data demodulation module, for carrying out demodulation according to the modulation system preset to the signal that channel equalization module exports, recovers original transmission data.
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| CN103856422B (en) * | 2014-03-17 | 2017-10-17 | 清华大学 | A kind of method and apparatus of the transmission signal configuration and channel estimation of multicarrier Large Scale mimo systems |
| KR20220011135A (en) | 2019-05-22 | 2022-01-27 | 지티이 코포레이션 | Method and apparatus for dummy sequence insertion in data modulation |
| CN110830409B (en) * | 2019-11-15 | 2022-02-22 | 同方电子科技有限公司 | Exogenous radiation radar reference channel estimation and channel estimation model training method |
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| CN101359929A (en) * | 2007-07-30 | 2009-02-04 | 中兴通讯股份有限公司 | Data receiving method for TD-SCDMA system |
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| CN101931598A (en) * | 2009-06-25 | 2010-12-29 | 清华大学 | Self-adaptive digital signal transmission method and system |
| CN101997802A (en) * | 2009-08-19 | 2011-03-30 | 清华大学 | Transmission method of digital signal |
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| CN1780276A (en) * | 2004-11-25 | 2006-05-31 | 都科摩（北京）通信技术研究中心有限公司 | Combined time synchronizing and frequency bias evaluation and evaluating device for orthogonal frequency division duplex system |
| CN101359929A (en) * | 2007-07-30 | 2009-02-04 | 中兴通讯股份有限公司 | Data receiving method for TD-SCDMA system |
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