CN108234376A - Radio data communication method and device - Google Patents
Radio data communication method and device Download PDFInfo
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- CN108234376A CN108234376A CN201711270239.0A CN201711270239A CN108234376A CN 108234376 A CN108234376 A CN 108234376A CN 201711270239 A CN201711270239 A CN 201711270239A CN 108234376 A CN108234376 A CN 108234376A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2665—Fine synchronisation, e.g. by positioning the FFT window
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The present invention is suitable for field of communication technology, provides a kind of radio data communication method and device, the method includes：The arrangement set of leading symbol is generated, wherein, leading symbol arrangement set includes thick synchronizing symbol and smart synchronizing symbol；The digital signal that needs are sent is modulated to generate modulated signal, and leading symbol arrangement set is inserted into form transmitting signal before modulated signal；The docking collection of letters number carries out thick synchronous and essence synchronization process, obtain timing offset, carrier frequency offset and the carrier phase for receiving signal, timing offset and carrier frequency offset the docking collection of letters number according to signal is received is timed restoration and compensation processing, and carry out carrier auxiliary to the reception signal after the Timed Recovery compensation deals according to carrier frequency offset and carrier phase.Slightly synchronous detection is first carried out to received signal the present invention is based on Chirp, the synchronous detection of essence is further carried out, so that this method can effectively capture signal under the operating condition of low SNR.
Description
Technical field
The invention belongs to field of communication technology more particularly to a kind of radio data communication methods and device.
Background technology
Wireless low-power consumption Wide Area Network is a kind of to meet the long range wireless communication skill that Internet of Things demand is come into being
Art, this communication technology requirement equipment has low receiving sensitivity and equipment can be in the state of low-power consumption, low cost
Work.
According to Shannon's theorems, it is to improve receiving sensitivity most direct effective means to reduce communication service rate, when not examining
Spread spectrum and FEC are considered when other expenses, and service rate, but excessively drop can while be effectively reduced by reducing physical layer symbol rate
Low physical layer symbol rate can bring the decline of signal effective bandwidth Bw, this may by application environment electromagnetic spectrum supervise with
And between transceiver carrier frequency offset limitation.In addition, system physical layer character rate can not reduced by spread spectrum
Under the conditions of, continue to reduce effective traffic rate；But spread spectrum can lead to the reduction of demodulation threshold SNR in receiver system bandwidth, and
Existing communication system under the operating condition of low SNR for cannot quickly and effectively capture signal.
Invention content
In view of this, an embodiment of the present invention provides radio data communication method and device, to solve to exist in the prior art
The problem of signal cannot be quickly and effectively captured under the operating condition of low SNR.
The first aspect of the embodiment of the present invention provides a kind of radio data communication method, including：Including signal send and
Signal receives；
The arrangement set of leading symbol is generated, wherein, leading symbol arrangement set includes thick synchronizing symbol symbol synchronous with essence
Number；
The digital signal sent to needs is modulated to generate modulated signal, and leading character is inserted into before modulated signal
Number arrangement set to form transmitting signal；
Transmitting signal is received, and thick synchronous and smart synchronization process is carried out to the reception signal, is connect described in acquisition
Timing offset, carrier frequency offset and the carrier phase of the collection of letters number；
Recovery is timed according to the timing offset for receiving signal and carrier frequency offset to the reception signal to mend
Processing is repaid, and the reception signal after the Timed Recovery compensation deals is carried out according to carrier frequency offset and carrier phase
Carrier auxiliary.
Optionally, the coarse synchronization signal includes one or more continuous positive chirp pulse signal and reverse linear
Chirp signal；The essence synchronizing signal includes the synchronizing signal with autocorrelation performance；
The docking collection of letters number carries out a thick synchronization process and includes：The chirp pulse signal received is referred to local
The conjugated signal of signal is multiplied, and calculates the power spectrum of the product signal after being multiplied, according to the peak-peak position of power spectrum to carrying
The timing of wave frequency rate deviation and leading symbol beginning boundary carries out rough estimate；
The docking collection of letters number carries out a smart synchronization process and includes：By signal to be detected carry out after thick synchronizing information compensation with essence
Synchronizing signal carries out related calculation, and when detecting effective energy, is determined to receive letter according to the time domain and the deviation of frequency domain that search
Number the deviation of carrier frequency and the timing of symbol, the phase information of the accumulative complex result corresponding according to effective energy output
Determine the carrier phase of reception signal.
Optionally, it is described according to carrier frequency offset and carrier phase to connecing after the Timed Recovery compensation deals
A number progress carrier auxiliary of collecting mail includes,
Integral Processing is carried out according to the carrier frequency offset and carrier phase received to loop filter output signal to obtain
Output phase；
Phase compensation is carried out according to the output phase docking collection of letters number, obtained phase compensation signal is exported, simultaneously
Phase demodulation processing is carried out to the phase deviation of signal after phase compensation, obtains the estimation of phase difference；
The estimated value of phase difference is filtered to obtain loop filter output signal.
Optionally, it before described pair needs the digital signal sent to be modulated, further includes：Pass through bit data redundancy
Mode spread processing is carried out to the digital signal that sends of needs；
After the reception signal is timed restoration and compensation processing, further include：Signal after compensating Timed Recovery
Carry out despreading processing.
Optionally, it before described pair needs the digital signal sent to be modulated, further includes：The number that needs are sent
Signal carries out FEC coded treatments；
After number progress carrier auxiliary compensation deals are collected mail in the docking, further include：After carrier auxiliary compensation deals
Signal carry out FEC decoding processing.
The second aspect of the embodiment of the present invention provides a kind of wireless data communication device, including：
Leading symbol generation module, for generating the arrangement set of leading symbol, wherein, leading symbol arrangement set includes
Thick synchronizing symbol and smart synchronizing symbol；
Modulation module, the digital signal for being sent to needs are modulated to generate modulated signal, and in modulated signal
It is inserted into leading symbol arrangement set before to form transmitting signal；
Synchronization module for being received to transmitting signal, and docks the collection of letters number and carries out thick synchronous and smart synchronization process, obtains
Take timing offset, carrier frequency offset and the carrier phase for receiving signal；
Carrier wave adjust module, for according to receive signal timing offset and carrier frequency offset to it is described reception signal into
Row Timed Recovery compensation deals, and according to carrier frequency offset and carrier phase to after the Timed Recovery compensation deals
It receives signal and carries out carrier auxiliary.
The third aspect of the embodiment of the present invention provides a kind of wireless data communication device, including：
Digital modulator, for generating the arrangement set of leading symbol, and the digital signal sent to needs is modulated
To generate modulated signal, and the arrangement set of leading symbol is inserted into form transmitting signal before modulated signal；Wherein, it is leading
Symbol sebolic addressing set includes thick synchronizing symbol and smart synchronizing symbol；
Digital demodulator receives transmitting signal, and docks the collection of letters number and carry out thick synchronous and smart synchronization process, obtains
It is described receive signal timing offset, carrier frequency offset and carrier phase, and according to it is described receive signal timing offset and
Carrier frequency offset is timed restoration and compensation processing and according to carrier frequency offset and carrier phase to the reception signal
Carrier auxiliary is carried out to the reception signal after the Timed Recovery compensation deals.
Optionally, the digital modulator includes：
Leading symbol generator, for generating the arrangement set of leading symbol, wherein, leading symbol arrangement set includes thick
Synchronizing symbol and smart synchronizing symbol；
Modulator, the digital signal for being sent to needs are modulated to generate modulated signal；
Framer, for being inserted into the arrangement set of leading symbol before modulated signal to form transmitting signal；
Digit emitter, for carrying out transmitting processing to the transmitting signal.
Optionally, the digital demodulator includes：
Digit receiver, for receiving the transmitting signal of the digit emitter transmitting；
Synchronizer, the reception signal for being received to the digit receiver carry out thick synchronous and smart synchronization process, obtain
Timing offset, carrier frequency offset and the carrier phase for receiving signal；
Timing recoverer, for the timing offset according to the reception signal and carrier frequency offset to the reception signal
It is timed restoration and compensation processing；
Carrier auxiliary device, for according to carrier frequency offset and carrier phase to after the Timed Recovery compensation deals
Reception signal carry out carrier auxiliary.
Optionally, the synchronizer includes：
Thick synchronization unit, for by the conjugated signal phase of the chirp pulse signal received and local reference signal
Multiply, calculate the power spectrum of the product signal after being multiplied, according to the peak-peak position of power spectrum to carrier frequency offset and leading
The timing of symbol beginning boundary carries out rough estimate；
Smart synchronization unit, for related fortune will to be done to smart synchronizing signal after the thick synchronizing information compensation of signal to be detected progress
It calculates, when detecting effective energy, is determined to receive the inclined of the carrier frequency of signal according to the time domain and the deviation of frequency domain that search
The timing of difference and symbol determines to receive the load of signal according to the phase information of the corresponding accumulative complex result of effective energy output
Wave phase.
Optionally, the carrier auxiliary device includes：
For carrying out phase compensation according to the output phase docking collection of letters number, obtained phase compensation is believed for phase compensator
It number is exported；
Phase discriminator for carrying out phase demodulation processing to the phase deviation of signal after phase compensation, obtains the estimated value of phase difference；
Loop filter is filtered to obtain loop filter output signal for the estimated value to phase difference；
Digital oscillator, for according to the carrier frequency offset and carrier phase, being carried out to loop filter output signal
Integral Processing obtains output phase.
Optionally, the wireless data communication device further includes frequency multiplier and despreader, the frequency multiplier and modulator phase
Even, the despreader is connected with timing recoverer；
The frequency multiplier, the digital signal for being sent by way of bit data redundancy to needs are carried out at spread spectrum
Reason, and it is sent to the modulator；
The modulator, for being modulated to the transmitting signal after the spread processing；
The despreader, for carrying out despreading processing to the reception signal after the Timed Recovery compensation deals.
Optionally, the wireless data communication device further includes encoder and decoder, the encoder and modulator phase
Even, the decoder is connected with carrier auxiliary device；
The encoder, the digital signal for being sent to needs carry out FEC coded treatments, and be sent to the modulation
Device；
The modulator, for being modulated to the transmitting signal after the coded treatment；
The decoder, for by the carrier auxiliary treated receive signal carry out FEC decoding processing, obtain
Demodulated signal.
Existing advantageous effect is the embodiment of the present invention compared with prior art：The embodiment of the present invention by signal send and
Signal receives two steps to complete the communication process of wireless data, first generates the arrangement set of leading symbol, wherein, leading character
Number arrangement set includes thick synchronizing symbol and smart synchronizing symbol；The digital signal that needs are sent is modulated to generate modulation letter
Number, and leading symbol arrangement set is inserted into form transmitting signal before modulated signal；Docking collect mail number carry out it is thick synchronous and
Smart synchronization process obtains timing offset, carrier frequency offset and the carrier phase for receiving signal, inclined according to the timing for receiving signal
Difference and the carrier frequency offset docking collection of letters number are timed restoration and compensation processing, and according to carrier frequency offset and carrier phase pair
It receives signal and carries out carrier auxiliary.Leading symbol is formed, while receiving by using thick synchronizing symbol and smart synchronizing symbol
It is inclined with the timing of correct detection reception signal, carrier frequency that thick synchronization process and smart synchronization process are carried out during signal respectively
Difference and carrier phase, so as to quickly and effectively capture signal under the operating condition of low SNR.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the flow chart of radio data communication method provided in an embodiment of the present invention；
Fig. 2 is the structure diagram of leading symbol sequence provided in an embodiment of the present invention；
Fig. 3 is the waveform diagram of coarse synchronization signal provided in an embodiment of the present invention；
Fig. 4 is the structure composition schematic diagram of transmitting signal provided in an embodiment of the present invention；
Fig. 5 is S provided in an embodiment of the present inventionupbasechirp(t) and Sdownbasechirp(t) structure diagram of signal；
Fig. 6 is the flow diagram of carrier auxiliary process provided in an embodiment of the present invention；
Fig. 7 is the structure diagram of wireless data communication device provided in an embodiment of the present invention；
Fig. 8 is the structure diagram of carrier auxiliary device provided in an embodiment of the present invention；
Fig. 9 is the structure diagram of another wireless data communication device provided in an embodiment of the present invention；
Figure 10 is the structure diagram of another wireless data communication device provided in an embodiment of the present invention；
Figure 11 is a kind of structure diagram of specific wireless data communication device provided in an embodiment of the present invention.
Specific embodiment
In being described below, in order to illustrate rather than in order to limit, it is proposed that such as tool of particular system structure, technology etc
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specifically
The present invention can also be realized in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
Road and the detailed description of method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
Embodiment one
Referring to Fig. 1, the flow diagram of radio data communication method of the present invention is shown, details are as follows：
Step S101 generates the arrangement set of leading symbol, wherein, leading symbol arrangement set include thick synchronizing symbol and
Smart synchronizing symbol.
Referring to Fig. 2, the composition of leading symbol sequence is shown.As seen from the figure, leading symbol includes thick 201 He of synchronizing symbol
Smart 202 two parts of synchronizing symbol are respectively used to the thick synchronizing process of subsequent received signals and smart synchronizing process.
Optionally, coarse synchronization signal 201 includes one or more continuous positive chirp pulse signal and reverse linear
Chirp signal, smart synchronizing signal include the synchronizing signal with autocorrelation performance.
Referring to Fig. 3, a coarse synchronization signal is shown, wherein, a coarse synchronization signal includes multiple positive linear frequency modulations
The number of pulse and multiple counter chirped pulses, positive chirp and reversed frequency modulation on pulse can be independently clever
Configuration living.Positive chirp pulse signal can be expressed as Up Chirp signals, Up Chirp signal frequencies line at any time
Property is incremented by；Counter chirped pulse signal can be expressed as Down Chirp signals, and the frequency of Down Chirp signals is at any time
Between linear decrease.Wherein, the part being made of Up Chirp signals is known as UpChirpPeriod, by Down Chirp signal structures
Into part be known as DownChirpPeriod.The length of the last one Up Chirp signal and the last one Down Chirp signal
Degree all can be score, such as 1/4 length is indicated as a complete Up Chirp signal or Down Chirp signal lengths
Preceding 1/4 blocks generation.
For smart synchronizing signal, it is the signal with autocorrelation performance to choose here.Auto-correlation is to signal correlation journey
Degree a kind of measurement, auto-correlation can regard as simultaneously signal is multiplied with the postpones signal of itself after product progress integration transport
It calculates, autocorrelation signal plays an important role in signal detection.Here standard m-sequences may be used by constellation mapping to produce
Raw, m-sequence is a kind of linear pseudo-random sequence, has good autocorrelation performance.In addition, the length of m-sequence can be according to being
The demand of system is flexibly configured.
Step S102, the digital signal sent to needs are modulated to generate modulated signal, and before modulated signal
The arrangement set of leading symbol is inserted into form transmitting signal.
Under normal circumstances, the digital signal to be sent is not suitable for carrying out the transmission of long range on transport channels, because
This, it is necessary to digital signal is modulated, signal is moved at low frequency to high frequency treatment, can just be transmitted in the channel.This
In digital modulation mode can select the various modulation systems such as BPSK, QPSK, QAM, (G) FSK.Referring to Fig. 4, modulation is believed
Number, need with leading symbol 401 it is combined with generate emit signal, here before modulated signal 403 be inserted into leading symbol 401
Arrangement set according to the demand of system, can also be believed in specific operating mode in 401 arrangement set of leading symbol and modulation
A packet header 402 is inserted between numbers 403, header part is used to carry the control information of some physical layers.
Transmitting signal after combination using transmitting is molded and signal could be launched after up-sampling treatment.Example
Such as, when using BPSK digital modulations transmitting molding filtration generally use root rise more than swirler blade angle device, impulse response function RC0
(t) it is as follows：
Wherein, roll-off factor α can flexibly match according to system application requirement；TsFor symbol durations.More than being risen using root
String wave filter can realize the effect of raised cosine filter, while eliminate intersymbol interference, ensure that sampled point is undistorted.
Since the data rate handled in signal modulation process is deposited with D/A conversions and the required data rate of radio-frequency transmissions
In certain difference, it is therefore desirable to up-sampling treatment is carried out to the data of transmission, so that data can be suitble in D/A moduluss of conversion
It is transmitted in block.
Signal after transmitting forming processes and up-sampling treatment by D/A is converted, realizes data by digital signal
To the transformation of analog signal, will be put by the transformed analog signals of D/A using up-conversion, radio frequency I/Q orthogonal modulations, power
Launched after the processing such as big by antenna.
Step S103 receives transmitting signal, and docks the collection of letters number and carry out thick synchronous and smart synchronization process, and acquisition connects
Timing offset, carrier frequency offset and the carrier phase of the collection of letters number.
Likewise, it is corresponding with signal transmission process, first antenna input signal is carried out in signal receive process needs
The processing such as analog filtering, I/Q quadrature frequency conversions, so as to export Low Medium Frequency or base-band analog signal.Low Medium Frequency or base band are obtained again
After analog signal, the docking collection of letters number is needed to be sampled, so as to fulfill the transformation from analog signal to digital signal.
It is corresponding with the transmitting forming processes in transmitting signal and up-sampling treatment, in one end needs pair for receiving signal
It receives signal and carries out the processing such as down-sampled processing and reception molding filtration.Wherein, input digital signal A/D is completed in down-sampled processing
Sample rate is to the conversion of digital baseband samples rate (such as 8 times of system symbol rates).When using BPSK digital modulations, molding is received
Wave filter uses swirler blade angle device more than the root liter consistent with transmitting molding.
After receiving terminal is completed to receive the down-sampled processing of signal and receive molding filtration processing, need using leading character
Number docking, which is collected mail, number carries out Acquisition Detection, a timing offset, the estimation of carrier frequency offset and phase, so as to complete to receive signal
Correct demodulation.Synchronous process is divided into two steps of thick synchronization process and smart synchronization process.
Optionally, the thick synchronization process of the docking collection of letters number progress includes：By the chirp pulse signal received and local
The conjugated signal of reference signal is multiplied, and the power spectrum of the product signal after being multiplied is calculated, according to the peak-peak position of power spectrum
Rough estimate is carried out to the timing of carrier frequency offset and leading symbol beginning boundary.
Illustratively, it is assumed that it is Δ τ, Chirp that the carrier frequency offset for receiving signal, which is Δ f, Chirp symbol time offset,
The slope that signal frequency changes linearly over time is μ.The docking collection of letters number successively carries out Up respectively as unit of Chirp symbols
Chirp is detected and Down Chirp detections.
Detection process firstly, for Up Chirp is：By signal r (t) to be detected and locally generated basic Down
Chirp signals Sdownbasechirp(t) it is multiplied, FFT operations are carried out to output signal after multiplication and obtains frequency domain power output pow_
Up=(abs (fft (r (t) * Sdownbasechirp)))2, it is an effective Up when adjudicating current demand signal according to pow_up peak-peaks
During Chirp signals, the estimation to Δ f+u Δs τ can be obtained by pow_up peak-peaks location index, wherein abs () is seeks width
Spend function.
Similar with the detection of Up Chirp, the detection process of Down Chirp signals is：By signal r (t) to be detected with
Locally generated basic Up Chirp signals Supbasechirp(t) it is multiplied, FFT operations are carried out to output signal after multiplication and obtains frequency
Domain power output pow_down=(abs (fft (r (t) * Supbasechirp)))2, it is current when being adjudicated according to pow_down peak-peaks
When signal is an effective Down Chirp signal, it can be obtained by pow_down peak-peaks location index and Δ f-u Δs τ is estimated
Meter.
Referring to Fig. 5, basic Up Chirp signals S is shownupbasechirp(t) and basic Down Chirp signals
Sdownbasechirp(t).By combining the testing result to Up Chirp and Down Chirp, can obtain estimating Δ f and Δ τ
Meter, so as to complete docking collect mail number in targeting signal Up Chirp and Down Chirp symbols beginning boundary timing and
The rough estimate of carrier frequency offset.
In addition, can emit multiple continuous Up Chirp signals in transmitting terminal, thus in above-mentioned Up Chirp detection process,
Pow_up can be exported to the frequency domain power of multiple continuous symbols and carries out intersymbol filtering to improve detection performance, intersymbol filtering can
It is handled using smooth or IIR iterative filterings.Likewise, can emit multiple continuous Down Chirp signals in transmitting terminal, so as to
In above-mentioned Down Chirp detection process, pow_down can be exported to the frequency domain power of multiple continuous symbols and carry out intersymbol filter
Wave is to improve detection performance.
It after the thick synchronization process for completing signal, needs on the basis of thick synchronization process, signal is carried out at smart synchronize
Reason.
Optionally, the smart synchronization process of the docking collection of letters number progress includes：After signal to be detected is carried out thick synchronizing information compensation
It carries out related calculation with smart synchronizing signal, when detecting effective energy, determines to connect according to the time domain and the deviation of frequency domain that search
The deviation of carrier frequency of the collection of letters number and the timing of symbol, the phase of the accumulative complex result corresponding according to effective energy output
Information determines to receive the carrier phase of signal.
Before smart synchronization process is carried out, need first to dock the carrier frequency offset obtained by thick synchronous detection and collect mail
Number carrier wave frequency deviation correction is carried out, and then the synchronous detection of essence is carried out to the signal after correction.
Illustratively, by taking Down Chirp signals as an example, illustrate the process of the smart synchronization process of signal.
Assuming that the DownChirpPeriod partial-lengths of leading symbol are Tdownchirp, a standard UpChirp or
DownChirp length is Tchirp, slightly synchronizing corresponding first DownChirp primary sign boundary when detecting successfully is periodically slightly
ts, maximum possible residual timing offset and carrier wave frequency deviation are respectively STO after slightly synchronizing successfullyErrAnd CFOErr。
When thick synchronization detects successfully, identified beginning character boundary is periodically slightly tsOn the basis of, withFor beginning point of reference, follow-upA integer
TchirpPeriod candidate's timing point (t0, t0+Tchirp, t0+2*Tchirp..., t0+(Nc-1)*Tchirp) the two of time-frequency domain is carried out successively
Dimension search, wherein floor are expressed as downward bracket function.
Wherein, in carrying out smart synchronization detection process can pair when domain search and frequency domain search concurrently carry out simultaneously, time domain
Searching for reference benchmark is slightly synchronous timing offset estimated result, ranging from-STOErrTo STOErr, timing search step-length precision takes
Can be four times of over-sampling rate (time step 1/4*t certainly in system performance requirementss)；Frequency domain search reference data is thick synchronous
Carrier frequency offset estimated result, ranging from-CFOErrTo CFOErr, frequency search precision step-length and smart synchronizing symbol length and
System performance requirements are related.
After the timing point and search range for determining search, start the docking collection of letters number and carry out a smart synchronization process,
It needs to carry out related calculation received signal and locally known smart synchronizing signal during processing, by correlated results accumulation and defeated
Go out its energy, once detecting that effective energy exports, then essence synchronization detects successfully, according to the time domain of current search and frequency domain deviation
The smart synchronizing symbol timing of update and the estimated result of carrier frequency offset, while utilize related progressive corresponding to effective energy output
The phase information of complex result obtains the estimated result of current carrier phase.
Step S104 determines the reception signal according to the timing offset for receiving signal and carrier frequency offset
When restoration and compensation handle, and according to carrier frequency offset and carrier phase to the reception after the Timed Recovery compensation deals
Signal carries out carrier auxiliary.
Wherein, Timed Recovery compensation deals receive signal in demodulating process by clock jitter institute for tracking and compensating
Lead to the drift of data sampling timing, to ensure the correct demodulation of data.Here restoration and compensation processing is being timed to signal
When required data include synchronization process it is obtained receive signal carrier frequency offset, pass through dock collect mail number carrier wave
Frequency departure can estimate transmitting-receiving sampling clock error, and then data to be demodulated are timed with precompensation processing.It is false
If carrier wave frequency deviation is Δ f, radio frequency carrier frequency fc, then receive and dispatch sampling clock deviation and be estimated as：Δf/fc.Obtaining, clock is inclined
The timing offset of detection is compensated after difference estimation.Alternatively, Timed Recovery compensation deals can also by delay phase-locked loop come
It realizes.
Optionally, referring to Fig. 6, according to carrier frequency offset and carrier phase to after the Timed Recovery compensation deals
Reception signal carry out carrier auxiliary include step S601 to step S603.
Step S601 integrates loop filter output signal according to the carrier frequency offset and carrier phase that receive
Processing obtains output phase.
Wherein, carrier frequency offset and carrier phase are identified carrier frequency offset f after synchronization process0With carrier wave phase
Position θ0, it is shown below, to the output f of loop filteri(t) frequency integrator processing is carried out, output phase is obtained and is transmitted to phase
Position compensating module carries out phase compensation.
Step S602 carries out phase compensation according to the output phase docking collection of letters number, obtained phase compensation signal is carried out
Output, while phase demodulation processing is carried out to the phase deviation of signal after the phase compensation, obtain the estimation of phase difference.
Wherein, received signal is compensated according to obtained phase compensation, the signal after compensation is exactly carrier auxiliary
Output.Meanwhile the signal after compensation also serves as the input signal of phase demodulation processing, is handled by phase demodulation and completes the docking collection of letters number
The estimation of phase difference.
Step S603 is filtered to obtain loop filter output signal to the estimated value of phase difference.
The phase difference of reception signal obtained after phase demodulation is filtered, obtains rate-adaptive pacemaker.Wherein, loop filtering
Device can select single order or multiple-rank arrangement.
By above-mentioned steps, it can realize the tracking to carrier wave frequency deviation and eliminate carrier wave frequency deviation and phase deviation docking
The influence of the collection of letters number, to guarantee to obtain demodulated signal that is correct and stablizing.
Optionally, it before described pair needs the digital signal sent to be modulated, further includes：Pass through bit data redundancy
Mode spread processing is carried out to the digital signal that sends of needs；
After the reception signal is timed restoration and compensation processing, further include：Signal after compensating Timed Recovery
Carry out despreading processing.
By analysis in the background technology, it is recognised that can by spread spectrum in the case where system symbol rate is certain
To effectively reduce service rate, meanwhile, higher antijamming capability can also be obtained, and improve band utilization by spread spectrum
Rate.Therefore, spread processing first is carried out to digital signal before the digital signal sent to needs is modulated.
When spreading factor is SF, then significant bit service rate is reduced to the 1/SF before spread spectrum after spreading.Spread spectrum can be with
It is realized, that is, as unit of each bit, input data is repeated SF times, and successively by the method for data bit redundancy
Output.When incoming bit stream is L, then the output bit flow after spreading is then L*SF.For spread spectrum, can also by puppet with
Machine sequence or orthogonal intersection realize that details are not described herein.
Likewise, it is corresponding with data sending terminal, despreading processing is carried out to the data of reception in the receiving terminal needs of data,
To restore transmitted data.
Here it can be dropped under conditions of phy symbol rate is not reduced by first carrying out spread processing to transmission signal
Low service rate, and then reduce receiving sensitivity performance boundary.
Optionally, it before the digital signal sent to needs is modulated processing, further includes：The number that needs are sent is believed
Number carry out FEC coded treatments.
After number progress carrier auxiliary compensation deals are collected mail in the docking, further include：After carrier auxiliary compensation deals
Signal carry out FEC decoding processing.
FEC is encoded to forward error correction coding, by redundant correcting code is added in being arranged in transmission code ensure signal it is long away from
From the transmitting in communication.Specifically, the signal to be transmitted is carried out FEC codings, data can be improved in crossing process
In by the error correcting capability after noise and environmental disturbances, so as to ensure the correct transmission of data.FEC codings can be divided into convolutional code
And block code, wherein, convolutional code not only has more excellent error correcting capability, and relatively common linear block codes has decoding
Postpone the advantages of smaller and implementation complexity is moderate, therefore use convolutional code here.
Illustratively, use convolutional code according to the process encoded for：(wherein, the K when convolutional code is (2,1, K)
Represent constraint length), since first input bit of upper-layer service data packet, serially by bits of encoded, each input bit
Corresponding 2 coded-bits output；In order to ensure the reliability of last several data bit decodings, usually in input data bit tail
K-1 tail bit 0 is filled in portion, after receiving terminal decodes, need to delete corresponding tail bit.
Likewise, it is corresponding with data sending terminal, it needs to carry out at FEC decodings the data of reception in the receiving terminal of data
Reason, to restore transmitted data.
It should be understood that the size of the serial number of each step is not meant to the priority of execution sequence, each process in above-described embodiment
Execution sequence should determine that the implementation process without coping with the embodiment of the present invention forms any limit with its function and internal logic
It is fixed.
Compared with prior art, the embodiment of the present invention is sent by signal and signal receives two steps to complete no line number
According to communication process, first generate leading symbol arrangement set, wherein, leading symbol arrangement set include thick synchronizing symbol and essence
Synchronizing symbol；The digital signal that sends of needs is modulated to generate modulated signal, and is inserted into before modulated signal leading
The arrangement set of symbol is to form transmitting signal；The docking collection of letters number carries out thick synchronous and essence synchronization process, obtains and receives signal
Timing offset, carrier frequency offset and carrier phase are collected mail according to timing offset and the carrier frequency offset docking for receiving signal
Restoration and compensation processing number is timed, and according to carrier frequency offset and carrier phase to after Timed Recovery compensation deals
It receives signal and carries out carrier auxiliary.Leading symbol is formed, while to receiving by using thick synchronizing symbol and smart synchronizing symbol
Signal carries out thick synchronization process and smart synchronization process receives timing, carrier frequency offset and the carrier phase of signal with correct detection
Accurate estimation, so as to quickly and effectively capture signal under the operating condition of low SNR.
Embodiment two
Corresponding to the radio data communication method described in foregoing embodiments one, a kind of no line number provided in an embodiment of the present invention
According to the structure diagram of communication device.
Leading symbol generation module, for generating the arrangement set of leading symbol, wherein, leading symbol arrangement set includes
Thick synchronizing symbol and smart synchronizing symbol.
Modulation module, the digital signal for being sent to needs are modulated to generate modulated signal, and in modulated signal
It is inserted into leading symbol arrangement set before to form transmitting signal.
Synchronization module for being received to transmitting signal, and docks the collection of letters number and carries out thick synchronous and smart synchronization process, obtains
Take timing offset, carrier frequency offset and the carrier phase for receiving signal.
Carrier wave adjusts module, and the reception signal is determined according to the timing offset and carrier frequency offset for receiving signal
When restoration and compensation handle, and according to carrier frequency offset and carrier phase to the reception after the Timed Recovery compensation deals
Signal carries out carrier auxiliary.
It is synchronous with essence that above-mentioned wireless data communication device generates thick synchronizing symbol by setting leading symbol generation module
Symbol in receiving terminal, carries out thick synchronization process and smart synchronization process to dock collection of letters priority by synchronization module, passes through docking
The thick synchronization process and smart synchronization process collected mail number are combined, come obtain the timing offset for receiving signal, carrier frequency offset and
Carrier phase, finally by carrier wave adjustment module according to timing offset, carrier frequency offset and carrier phase docking collect mail number into
Row carrier auxiliary.By the thick synchronous detection based on Chirp signals, with essence, synchronous detect is combined to happen suddenly under realizing to low SNR
The synchronization acquistion of signal.
Embodiment three
Corresponding to the radio data communication method described in foregoing embodiments one, Fig. 7 shows provided in an embodiment of the present invention
The structure diagram of wireless data communication device.For convenience of description, part related to the present embodiment is illustrated only.
Referring to Fig. 7, which includes digital modulator 70 and digital demodulator 71.
Digital modulator 70, for generating the arrangement set of leading symbol, and the digital signal sent to needs is adjusted
System is inserted into the arrangement set of leading symbol to form transmitting signal to generate modulated signal before modulated signal；Wherein, it is preceding
It leads symbol sebolic addressing set and includes thick synchronizing symbol and smart synchronizing symbol；
Digital demodulator 71 receives transmitting signal, and docks the collection of letters number and carry out thick synchronous and smart synchronization process, obtains
Timing offset, carrier frequency offset and the carrier phase for receiving signal is taken, and according to the timing offset for receiving signal
Restoration and compensation processing is timed and according to carrier frequency offset and carrier wave phase to the reception signal with carrier frequency offset
Position carries out carrier auxiliary to the reception signal after the Timed Recovery compensation deals.
Optionally, digital modulator 70 includes：Leading symbol generator 7001, for generating the sequence sets of leading symbol
It closes, wherein, leading symbol arrangement set includes thick synchronizing symbol and smart synchronizing symbol；Modulator 7002, for needing to send
Digital signal be modulated to generate modulated signal；Framer 7003, for being inserted into leading symbol before modulated signal
Arrangement set is to form transmitting signal；Digit emitter 7004, for carrying out transmitting processing to the transmitting signal.
Optionally, digital demodulator 71 includes：Digit receiver 7101, for receiving the hair of the digit emitter transmitting
Penetrate signal；Synchronizer 7102, the reception signal for being received to the digit receiver 7101 carry out thick synchronous place synchronous with essence
Reason obtains timing offset, carrier frequency offset and the carrier phase for receiving signal；Timing recoverer 7103, for basis
The timing offset for receiving signal and carrier frequency offset are timed restoration and compensation processing to the reception signal；Carrier wave is extensive
Multiple device 7104, for according to carrier frequency offset and carrier phase to the reception signal after the Timed Recovery compensation deals
Carry out carrier auxiliary.
Optionally, synchronizer 7102 includes thick synchronization unit and smart synchronization unit.
Thick synchronization unit, for by the conjugated signal phase of the chirp pulse signal received and local reference signal
Multiply, calculate the power spectrum of the product signal after being multiplied, according to the peak-peak position of power spectrum to carrier frequency offset and leading
The timing of symbol beginning boundary carries out rough estimate.
Smart synchronization unit, for related fortune will to be done to smart synchronizing signal after the thick synchronizing information compensation of signal to be detected progress
It calculates, when detecting effective energy, is determined to receive the inclined of the carrier frequency of signal according to the time domain and the deviation of frequency domain that search
The timing of difference and symbol determines to receive the load of signal according to the phase information of the corresponding accumulative complex result of effective energy output
Wave phase.
Optionally, referring to Fig. 8, carrier auxiliary device 7104 includes：Phase compensator 801, phase discriminator 802, loop filter
803 and digital oscillator 804.Phase compensator 801, for carrying out phase compensation to the reception signal according to output phase,
Obtained phase compensation signal is exported；Phase discriminator 802, for carrying out phase demodulation to the phase deviation of signal after phase compensation
Processing, obtains the estimated value of phase difference；Loop filter 803 is filtered to obtain ring for the estimated value to phase difference
Road filtered output signals；Digital oscillator 804, it is defeated to loop filtering for according to the carrier frequency offset and carrier phase
Go out signal progress Integral Processing and obtain output phase.
Optionally, referring to Fig. 9, wireless data communication device further includes frequency multiplier 7005 and despreader 7105, the spread spectrum
Device 7005 is connected with modulator 7002, and the despreader 7105 is connected with timing recoverer 7103；The frequency multiplier 7005, is used for
Spread processing is carried out, and be sent to the modulator to the digital signal that needs are sent by way of bit data redundancy
7002；The modulator 7002, for being modulated to the transmitting signal after the spread processing；The despreader
7105, for carrying out despreading processing to the reception signal after the Timed Recovery compensation deals.
Optionally, referring to Figure 10, wireless data communication device further includes encoder 7006 and decoder 7106, the coding
Device 7006 is connected with modulator 7002, and the decoder 7106 is connected with carrier auxiliary device 7104；The encoder 7006, is used for
FEC coded treatments are carried out, and be sent to the modulator 7002 to the digital signal that needs are sent；The modulator 7002 is used
It is modulated in the transmitting signal after the coded treatment；The decoder 7106, for extensive by the carrier wave
Treated again receives signal progress FEC decoding processing, obtains demodulated signal.
Compared with prior art, the embodiment of the present invention realizes no line number by setting digital modulator and digital demodulator
According to communication, the arrangement set of leading symbol is generated by leading symbol generator, wherein, leading symbol arrangement set includes thick
Synchronizing symbol and smart synchronizing symbol；The digital signal sent by modulator to needs is modulated to generate modulated signal, leads to
It crosses framer and leading symbol arrangement set is inserted into before modulated signal to form transmitting signal；By digit emitter to signal
Carry out transmitting processing；The data of transmitting are being received by digit receiver, number progress is collected mail slightly by synchronizer docking
Synchronous and smart synchronization process, obtains timing offset, carrier frequency offset and the carrier phase for receiving signal, passes through timing recoverer
Timing offset and carrier frequency offset the docking collection of letters number according to signal is received is timed restoration and compensation processing, extensive by carrier wave
Multiple device collects mail number progress carrier auxiliary to obtain accurately solving adjusting data according to carrier frequency offset and carrier phase docking.Pass through
Thick synchronization unit and the smart synchronization unit docking collection of letters number carry out thick synchronization process respectively and smart synchronization process is received with correct detection
The accurate estimation of the timing of signal, carrier frequency offset and carrier phase, so as to quickly have under the operating condition of low SNR
The capture signal of effect.
Example IV
In order to make it easy to understand, the structure diagram an embodiment of the present invention provides another wireless data communication device.In order to
Convenient for explanation, part related to the present embodiment is illustrated only.
Mainly include digital modulator, D/A converter, radiofrequency launcher, radio frequency typically for a digital communication system
The parts such as receiver, A/D converter, digital demodulator.For different digital modulation techniques, transmitter and reception in system
The modulation and demodulation specific implementation structure of machine can change.Referring to Figure 10, here using BPSK modulation techniques as reference, show
The composition structure of digital communication system, when using other modulation techniques, structure and Figure 11 of digital communication system have part
Difference.
Wherein, digital modulator 110 is inputted for completing conversion of the upper-layer service data to physical frame as the effective industry in upper strata
Business data bit, exports physics frame of digital signal.Digital modulator 110 mainly includes leading symbol generator 116, FEC is encoded
The submodules such as device 111, interleaver 112, frequency multiplier 113, scrambler 114, modulator 115, framer 117, digital transmission front end 118
Block is described as follows respectively：
For leading symbol generator 116 for generating leading symbol sequence, leading symbol sequence includes coarse synchronization signal and essence
Two parts of synchronizing signal, coarse synchronization signal include UpChirp signals and DownChirp signals, and signal can be divided into
UpChirpPeriod, DownChirpPeriod two parts.Smart synchronizing signal uses the synchronous letter with good correlation properties
Number.It has been situated between in detail in embodiment one for specific UpChirp signals, DownChirp signals and smart synchronizing signal
It continues, which is not described herein again.
For the data-signal that needs are sent, data-signal is encoded by FEC encoder 111 first, so as to increase
The antijamming capability that strong data are transmitted in the channel.Interleaver 112 will be passed through by the data of FEC encoder 111 with further
Improve the interference free performance of transmission data.Original data sequence can be upset by interleaver 112 so that data before and after intertexture
The correlation of sequence weakens, and the mode of intertexture can be selected flexibly, and the mode of fixed row, column displacement may be used here
To be interleaved processing to signal.
Signal after intertexture is handled by frequency multiplier 113 reduces effective service rate later, and spread processing simultaneously may be used
To enhance the antijamming capability of signal.Signal after spread spectrum using scrambler 114, so as to reduce since above-mentioned spread spectrum is grasped
Longer continuous 0 or 1 bit occurred in bit repetition caused by work and data.Specifically, m-sequence has preferable puppet
Random sequence characteristic can be used as scrambled scrambler sequence.By spread spectrum module output bit data flow and equal length scrambler sequence
Bit stream is exported as scrambling after carrying out binary logic xor operation by bit.It is complete by the signal after scrambling by modulator 115
The digital modulation of paired data binary bit stream.
The leading symbol that the modulated signal and leading symbol generator 116 that are exported by modulator 115 generate is input to
The modulated signal of output and leading symbol are combined to obtain a physics frame signal by framer 117, framer 117.Will
The physics frame signal arrived passes through digital transmission front end 118, and signal is carried out transmitting forming processes and up-sampling treatment, output signal
To D/A converter 130, conversion of the digital signal to analog signal is completed by D/A converter.It is transformed D/A will to be passed through again
Signal is exported to radiofrequency launcher 140, will be emitted by the signal of radiofrequency launcher 140 further across antenna.
In signal receiving end, completed by radio frequency receiver 160, A/D converter 150 and digital demodulator 120 to letter
Number demodulation.
The signal that transmitting terminal is sent is received by antenna in signal receiving end, then the signal of transmitting is passed through into radio frequency
Receiver 160 obtains Low Medium Frequency or baseband signal, and obtained low intermediate frequency signal is passed through A/D converter 150 complete pair signals
Sampling, the digital signal after being sampled.
Digital demodulator 120 is mainly used for completing the demodulation of A/D digits after conversion signals, reception processing, including receiving number
Word front end 121, synchronizer 122, timing recoverer 123, descrambler 124, despreader 125, carrier auxiliary device 126, de-mapping device
127th, the submodules such as deinterleaver 128, FEC decoders 129, are described as follows respectively：
By after the sampling that A/D converter 150 obtains digital signal through reception digital front-end 121, to signal into
Row is down-sampled and receives molding filtration processing.To through and reception treated the signal transmission of digital front-end 121 to 122 He of synchronizer
Timing recoverer 123 carries out Acquisition Detection and a physics frame timing by the thick synchronization unit docking collection of letters number in synchronizer 122
The rough estimate of deviation, carrier frequency offset and carrier phase；The smart synchronization unit then passed through in synchronizer 122 is synchronous by essence
The autocorrelation performance of signal is completed to the timing of smart synchronizing symbol and the accurate estimation of carrier frequency offset.Before it will receive number
While the data that end 121 generates are sent to synchronizer 122, the data and synchronizer that reception digital front-end 121 is generated are defeated
For the data transmission gone out to timing recoverer 123, it is inclined that timing recoverer 123 can provide transmitting-receiving carrier frequency according to synchronizer 122
Difference come obtain to receive and dispatch sampling clock error estimation, and then data to be demodulated are timed precompensation processing.
Treated the signal of timing recoverer 123 will be passed through and pass through descrambler 124 and despreader 125 successively.Pass through descrambling
Transmission data part signal is multiplied by device 124 symbol-by-symbol with the conjugation of locally generated known descramble signal, is added with eliminating
The influence to signal is disturbed, wherein, descramble signal does the signal after digital modulation for transmitting terminal scrambler sequence.Pass through despreader 125
Spread spectrum is removed in transmitting terminal to receiving the influences of data, when spreading factor is SF, before signal rate is spread spectrum after despreading
1/SF。
Data after despreading are sent to carrier auxiliary device 126, while it is extensive that the data of microsyn output are sent to carrier wave
Multiple device 126, using the data that despreader 125 is sent out as input signal, in the carrier frequency offset and phase of the offer of synchronizer 122
On the basis of information, carrier frequency and phase in residual carrier frequency deviation and demodulating process are removed by carrier auxiliary device 126
The influence of drift, to ensure to obtain demodulated signal that is correct and stablizing.Carrier auxiliary device 126 can be by digital phase-locked loop come complete
Influence into carrier wave frequency deviation and phase offset to signal.
By carrier auxiliary device 126, treated that signal also needs to successively by de-mapping device 127,128 and of deinterleaver
FEC decoders 129.It is readily comprehensible, it is corresponding with the interleaver 112 and FEC encoder 111 of communication system transmitting terminal,
Receiving terminal needs to set deinterleaver 128 and FEC decoders 129.Meanwhile transmitting terminal essence synchronizing signal generation process be by
M-sequence signal carries out constellation mapping to generate, and needs to eliminate the influence of the constellation mapping docking collection of letters number in output terminal.
Specifically, de-mapping device 127 under the pattern of FEC, exports the result of soft-decision；Under the pattern of non-FEC, output
The result that should be adjudicated.To be exported by the signal of de-mapping device 127 to deinterleaver 128, the concrete operations of deinterleaver 128 with
The processing procedure of interleaver 112 is related.The signal after deinterleaving is completed corresponding decoding by FEC decoders 129 to handle, it is defeated
Go out bit data information after decoding.For example, when FEC codings are using convolutional encoding, completed using Viterbi maximum likelihood algorithms
Entire decoding processing.
Above-mentioned wireless data communication system, by the way that leading symbol arrangement set is divided into coarse synchronization signal letter synchronous with essence
Number, and then thick synchronization process and smart synchronization process are carried out in the signal receiving end docking collection of letters number, receive determining for signal so as to obtain
When deviation, carrier frequency offset and carrier phase, and then collected mail and number be timed at restoration and compensation by timing recoverer docking
Reason carries out carrier auxiliary to obtain accurately according to carrier frequency offset and carrier phase by carrier auxiliary device to received signal
Solution adjusting data.In addition, service rate is reduced by carrying out spread processing to transmitting signal, so as to effectively reduce receiver
Receiving sensitivity performance boundary.Meanwhile it is translated by the carrier auxiliary demodulation of the synchronization acquistion of synchronizer, carrier auxiliary device, convolution
The processes such as code effectively reduce the synchronization of entire receiving terminal and demodulation process postpones introduced time overhead, and the system of ensure that has
Data throughout is imitated, can be adapted for various network environment applications.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each work(
Can unit, module division progress for example, in practical application, can be as needed and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device are divided into different functional units or module, more than completion
The all or part of function of description.Each functional unit, module in embodiment can be integrated in a processing unit, also may be used
To be that each unit is individually physically present, can also two or more units integrate in a unit, it is above-mentioned integrated
The form that hardware had both may be used in unit is realized, can also be realized in the form of SFU software functional unit.In addition, each function list
Member, the specific name of module are not limited to the protection domain of the application also only to facilitate mutually distinguish.Above system
The specific work process of middle unit, module can refer to the corresponding process in preceding method embodiment, and details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
In embodiment provided by the present invention, it should be understood that disclosed device/terminal device and method, it can be with
It realizes by another way.For example, device described above/terminal device embodiment is only schematical, for example, institute
The division of module or unit is stated, only a kind of division of logic function can have other dividing mode in actual implementation, such as
Multiple units or component may be combined or can be integrated into another system or some features can be ignored or does not perform.Separately
A bit, shown or discussed mutual coupling or direct-coupling or communication connection can be by some interfaces, device
Or the INDIRECT COUPLING of unit or communication connection, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical unit, you can be located at a place or can also be distributed to multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
That each unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although with reference to aforementioned reality
Example is applied the present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each
Technical solution recorded in embodiment modifies or carries out equivalent replacement to which part technical characteristic；And these are changed
Or replace, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (13)
1. a kind of radio data communication method, sends including signal and signal receives, which is characterized in that
The arrangement set of leading symbol is generated, wherein, leading symbol arrangement set includes thick synchronizing symbol and smart synchronizing symbol；
The digital signal that needs are sent is modulated to generate modulated signal, and leading symbol is inserted into before modulated signal
Arrangement set is to form transmitting signal；
Transmitting signal is received, and docks the collection of letters number and carries out slightly synchronous and smart synchronization process, obtains the reception signal
Timing offset, carrier frequency offset and carrier phase；
The reception signal is timed at restoration and compensation according to the timing offset for receiving signal and carrier frequency offset
Reason, and carrier wave is carried out to the reception signal after the Timed Recovery compensation deals according to carrier frequency offset and carrier phase
Restore.
2. radio data communication method as described in claim 1, which is characterized in that the coarse synchronization signal includes one or more
Continuous forward direction chirp pulse signal and counter chirped pulse signal；The essence synchronizing signal includes having auto-correlation
The synchronizing signal of characteristic；
The docking collection of letters number carries out a thick synchronization process and includes：By the chirp pulse signal received and local reference signal
Conjugated signal be multiplied, calculate be multiplied after product signal power spectrum, according to the peak-peak position of power spectrum to carrier frequency
The timing of rate deviation and leading symbol beginning boundary carries out rough estimate；
The docking collection of letters number carries out a smart synchronization process and includes：It will be synchronous with essence after the thick synchronizing information compensation of signal to be detected progress
Signal carries out related calculation, and when detecting effective energy, is determined to receive signal according to the time domain and the deviation of frequency domain that search
The deviation of carrier frequency and the timing of symbol are determined according to the phase information of the corresponding accumulative complex result of effective energy output
Receive the carrier phase of signal.
3. radio data communication method as described in claim 1, which is characterized in that described according to carrier frequency offset and carrier wave
Phase carries out carrier auxiliary to the reception signal after the Timed Recovery compensation deals and includes,
Integral Processing is carried out according to the carrier frequency offset and carrier phase received to loop filter output signal to be exported
Phase；
Phase compensation is carried out according to the output phase docking collection of letters number, obtained phase compensation signal is exported, while to phase
The phase deviation of signal carries out phase demodulation processing after the compensation of position, obtains the estimation of phase difference；
The estimated value of phase difference is filtered to obtain loop filter output signal.
4. radio data communication method as described in claim 1, which is characterized in that need the digital signal sent at described pair
Before being modulated, further include：Spread processing is carried out to the digital signal that needs are sent by way of bit data redundancy；
After the reception signal is timed restoration and compensation processing, further include：Signal after compensating Timed Recovery carries out
Despreading is handled.
5. radio data communication method as described in claim 1, which is characterized in that
Before described pair needs the digital signal sent to be modulated, further include：FEC is carried out to the digital signal that needs are sent
Coded treatment；
After number progress carrier auxiliary compensation deals are collected mail in the docking, further include：To the letter after carrier auxiliary compensation deals
Number carry out FEC decoding processing.
6. a kind of wireless data communication device, which is characterized in that including：
Leading symbol generation module, for generating the arrangement set of leading symbol, wherein, leading symbol arrangement set includes thick same
Walk symbol and smart synchronizing symbol；
Modulation module, the digital signal for being sent to needs are modulated to generate modulated signal, and before modulated signal
Leading symbol arrangement set is inserted into form transmitting signal；
Synchronization module for being received to transmitting signal, and docks the collection of letters number and carries out thick synchronous and smart synchronization process, obtains institute
State timing offset, carrier frequency offset and the carrier phase for receiving signal；
Carrier wave adjusts module, for being determined according to the timing offset and carrier frequency offset for receiving signal the reception signal
When restoration and compensation handle, and according to carrier frequency offset and carrier phase to the reception after the Timed Recovery compensation deals
Signal carries out carrier auxiliary.
7. a kind of wireless data communication device, which is characterized in that including：
Digital modulator, for generating the arrangement set of leading symbol, and the digital signal sent to needs is modulated to produce
Raw modulated signal, and the arrangement set of leading symbol is inserted into form transmitting signal before modulated signal；Wherein, leading symbol
Arrangement set includes thick synchronizing symbol and smart synchronizing symbol；
Digital demodulator receives transmitting signal, and docks the thick synchronous and smart synchronization process of the collection of letters number progress, described in acquisition
Timing offset, carrier frequency offset and the carrier phase of signal are received, and according to the timing offset and carrier wave for receiving signal
Frequency departure is timed restoration and compensation processing and according to carrier frequency offset and carrier phase to warp to the reception signal
It crosses the reception signal after the Timed Recovery compensation deals and carries out carrier auxiliary.
8. wireless data communication device as claimed in claim 7, which is characterized in that the digital modulator includes：
Leading symbol generator, for generating the arrangement set of leading symbol, wherein, leading symbol arrangement set includes thick synchronous
Symbol and smart synchronizing symbol；
Modulator, the digital signal for being sent to needs are modulated to generate modulated signal；
Framer, for being inserted into the arrangement set of leading symbol before modulated signal to form transmitting signal；
Digit emitter, for carrying out transmitting processing to the transmitting signal.
9. wireless data communication device as claimed in claim 8, which is characterized in that the digital demodulator includes：
Digit receiver, for receiving the transmitting signal of the digit emitter transmitting；
Synchronizer, the reception signal for being received to the digit receiver slightly synchronize and smart synchronization process, described in acquisition
Receive timing offset, carrier frequency offset and the carrier phase of signal；
Timing recoverer, for being carried out according to the timing offset for receiving signal and carrier frequency offset to the reception signal
Timed Recovery compensation deals；
Carrier auxiliary device, for according to carrier frequency offset and carrier phase to connecing after the Timed Recovery compensation deals
The collection of letters number carries out a carrier auxiliary.
10. wireless data communication device as claimed in claim 9, which is characterized in that the synchronizer includes：
Thick synchronization unit, for the chirp pulse signal received to be multiplied with the conjugated signal of local reference signal, meter
The power spectrum of the product signal after being multiplied is calculated, carrier frequency offset and leading symbol are risen according to the peak-peak position of power spectrum
The timing of initial line circle carries out rough estimate；
Smart synchronization unit, for will carry out related calculation after the thick synchronizing information compensation of signal to be detected progress with smart synchronizing signal,
When detecting effective energy, determined to receive the deviation and symbol of the carrier frequency of signal according to the time domain and the deviation of frequency domain that search
Number timing, the phase information of the accumulative complex result corresponding according to effective energy output determines to receive the carrier wave phase of signal
Position.
11. wireless data communication device as claimed in claim 9, which is characterized in that the carrier auxiliary device includes：
Phase compensator, for according to output phase docking collect mail number carry out phase compensation, by obtained phase compensation signal into
Row output；
Phase discriminator for carrying out phase demodulation processing to the phase deviation of signal after phase compensation, obtains the estimated value of phase difference；
Loop filter is filtered to obtain loop filter output signal for the estimated value to phase difference；
Digital oscillator, for according to the carrier frequency offset and carrier phase, being integrated to loop filter output signal
Processing obtains output phase.
12. wireless data communication device as claimed in claim 9, which is characterized in that the wireless data communication device also wraps
Frequency multiplier and despreader are included, the frequency multiplier is connected with modulator, and the despreader is connected with timing recoverer；
The frequency multiplier, for carrying out spread processing to the digital signal that needs are sent by way of bit data redundancy, and
It is sent to the modulator；
The modulator, for being modulated to the transmitting signal after the spread processing；
The despreader, for carrying out despreading processing to the reception signal after the Timed Recovery compensation deals.
13. wireless data communication device as claimed in claim 9, which is characterized in that the wireless data communication device also wraps
Encoder and decoder are included, the encoder is connected with modulator, and the decoder is connected with carrier auxiliary device；
The encoder, the digital signal for being sent to needs carry out FEC coded treatments, and be sent to the modulator；
The modulator, for being modulated to the transmitting signal after the coded treatment；
The decoder, for by the carrier auxiliary treated receive signal carry out FEC decoding processing, demodulated
Signal.
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