CN103873415A - Frequency offset estimation method, device and receiver - Google Patents
Frequency offset estimation method, device and receiver Download PDFInfo
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- CN103873415A CN103873415A CN201410088706.8A CN201410088706A CN103873415A CN 103873415 A CN103873415 A CN 103873415A CN 201410088706 A CN201410088706 A CN 201410088706A CN 103873415 A CN103873415 A CN 103873415A
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Abstract
The invention discloses a frequency offset estimation method, device and receiver and belongs to the technical field of communication. The method comprises the steps of performing frequency offset estimation according to a received synchronous signal and a known time domain sequence and obtaining a first frequency offset estimation value; determining the time information of the synchronous signal according to the first frequency offset estimation value; obtaining the phase difference between the known time domain sequence and the synchronous signal according to the time information, the phase information of the known time domain sequence and the phase information of the synchronous signal; obtaining a second frequency offset estimation value according to the obtained phase difference; judging whether the second frequency offset estimation value is effective or not; when the second frequency offset estimation value is not effective, taking the first frequency offset estimation value as the frequency offset estimation value; when the second frequency offset value is effective, obtaining the frequency offset estimation value according to the second frequency offset estimation value. The frequency offset estimation is performed by the synchronous signal and the known time domain, so the signal received by a received end can be normally demodulated.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of frequency deviation estimating method, device and receiver.
Background technology
OFDM(Orthogonal Frequency Division Multiplexing, OFDM) technology is a kind of special Multicarrier Transmission Technology, utilize multiple subcarrier pair user profile to transmit, and OFDM technology has adopted orthogonal sub-carriers to carry out beared information and has distinguished subchannel.Mutually orthogonal just because of each subcarrier of OFDM technical requirement, therefore, communication system based on OFDM technology requires the signal frequency of receiving terminal and transmitting terminal synchronous, so just need to carry out frequency deviation estimation to signal, so that estimate to reach the synchronous object of signal frequency of receiving terminal and transmitting terminal by frequency deviation.
Usually, it can be based on leading (Preamble that frequency deviation is estimated, known periods sequence), the known time domain sequences such as pilot tone (Pilot), known pseudo-random signal sequence aperiodic (Sounding) carries out, in the time that transmitting terminal sends for the synchronous synchronizing signal of signal, in synchronizing signal, add this known time domain sequences, in the time that receiving terminal receives this synchronizing signal, from this synchronizing signal, obtain this known time domain sequences, carry out frequency deviation estimation, thereby obtain frequency deviation estimated value.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
In the process of estimating in frequency deviation, generally can pre-determine the target zone of signal frequency deviation, in the time that accessed frequency deviation estimated value falls within this target zone, could carry out demodulation accurately to receiving signal according to this frequency deviation estimated value, estimate that the frequency deviation estimated value obtaining is difficult in this target zone and carry out a frequency deviation by above-mentioned frequency deviation algorithm for estimating, thereby make transmitting terminal and receiving terminal cannot reach the synchronous object of signal frequency, affect receiving terminal normal demodulation to the received signal, cause the performance of communication system sharply to decline.
Summary of the invention
In order to solve the problem of prior art, the embodiment of the present invention provides a kind of frequency deviation estimating method, device and receiver.Described technical scheme is as follows:
First aspect, provides a kind of frequency deviation estimating method, and described method comprises:
According to the synchronizing signal receiving and known time domain sequences, carry out frequency deviation estimation, obtain the first frequency deviation estimated value;
According to described the first frequency deviation estimated value, determine the temporal information of described synchronizing signal, described temporal information at least comprises the time of reception of described synchronizing signal at receiving terminal;
According to the phase information of the phase information of described temporal information, known time domain sequences and described synchronizing signal, obtain the phase difference between known time domain sequences and described synchronizing signal;
According to the phase difference obtaining, obtain the second frequency deviation estimated value;
Judge whether described the second frequency deviation estimated value is effective value;
In the time that described the second frequency deviation estimated value is not effective value, described the first frequency deviation estimated value is retrieved as to frequency deviation estimated value;
In the time that described the second frequency deviation estimated value is effective value, according to described the second frequency deviation estimated value, obtain frequency deviation estimated value.
In conjunction with first aspect, in the possible execution mode of the first of first aspect, according to described the second frequency deviation estimated value, obtain frequency deviation estimated value and comprise:
Described synchronizing signal is carried out to frequency shift (FS), the synchronizing signal after being offset according to the part beyond the integer frequency bias of described the second frequency deviation estimated value;
According to the synchronizing signal after described skew and described known time domain sequences, obtain the 3rd frequency deviation estimated value;
Using the integer frequency bias of described the second frequency deviation estimated value and described the 3rd frequency deviation estimated value and as frequency deviation estimated value.
In conjunction with first aspect, in the possible execution mode of the second of first aspect, judge whether described the second frequency deviation estimated value is that effective value comprises:
In the time that the difference of the second frequency deviation estimated value of present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is less than predetermined threshold value, determine that the second frequency deviation estimated value of described present frame synchronizing signal is effective value;
In the time that the difference of the second frequency deviation estimated value of described present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is not less than described predetermined threshold value, determine that the second frequency deviation estimated value of described present frame synchronizing signal is invalid value.
In conjunction with first aspect, in the third possible execution mode of first aspect, judge that whether described the second frequency deviation estimated value is after effective value, described method also comprises:
For n frame synchronizing signal, in the time that described the second frequency deviation estimated value is not effective value, the second frequency deviation estimated value of described n frame synchronizing signal is postponed, make the second frequency deviation estimated value of described n frame synchronizing signal be deferred to the output stage of the second frequency deviation estimated value of n+1 frame synchronizing signal;
In the time obtaining the second frequency deviation estimated value of described n+1 frame synchronizing signal, according to the second frequency deviation estimated value of described n frame synchronizing signal and the second frequency deviation estimated value of n+1 frame synchronizing signal, judge whether the second frequency deviation estimated value of described n+1 frame synchronizing signal is effective value.
In conjunction with the third possible execution mode of first aspect, in the 4th kind of possible execution mode of first aspect, according to the second frequency deviation estimated value of described n frame synchronizing signal and the second frequency deviation estimated value of n+1 frame synchronizing signal, judge whether the second frequency deviation estimated value of described n+1 frame synchronizing signal is that effective value comprises:
The second frequency deviation estimated value of described n+1 frame synchronizing signal and the second frequency deviation estimated value of described n frame synchronizing signal are subtracted each other, and the frequency deviation that obtains n+1 frame synchronizing signal is estimated difference;
Estimate difference according to the frequency deviation of described n+1 frame synchronizing signal, described n+1 frame synchronizing signal is adjusted to the described n+1 frame synchronizing signal after being adjusted;
N+1 frame synchronizing signal after described adjustment is carried out to filtering adjustment, obtain filtered n+1 frame synchronizing signal;
According to described filtered n+1 frame synchronizing signal and described n+1 frame synchronizing signal, carry out frequency deviation estimation, obtain the frequency deviation estimated value of described filtered n+1 frame synchronizing signal;
By the second frequency deviation estimated value frequency deviation estimated value of the frequency deviation estimated value of described filtered n+1 frame synchronizing signal and described n frame synchronizing signal and that be retrieved as described n+1 frame synchronizing signal;
Whether the second frequency deviation estimated value that judges described n+1 frame synchronizing signal is effective value.
Second aspect, provides a kind of frequency deviation estimation device, and described device comprises:
The first frequency deviation estimated value acquisition module, for according to the synchronizing signal and the known time domain sequences that receive, carries out frequency deviation estimation, obtains the first frequency deviation estimated value;
Temporal information acquisition module, for according to described the first frequency deviation estimated value, determines the temporal information of described synchronizing signal, and described temporal information at least comprises the time of reception of described synchronizing signal at receiving terminal;
Phase difference acquisition module, for according to the phase information of the phase information of described temporal information, known time domain sequences and described synchronizing signal, obtains the phase difference between known time domain sequences and described synchronizing signal;
The second frequency deviation estimated value module, for according to the phase difference obtaining, obtains the second frequency deviation estimated value;
Judge module, for judging whether described the second frequency deviation estimated value is effective value;
Frequency deviation estimated value acquisition module, in the time that described the second frequency deviation estimated value is not effective value, is retrieved as frequency deviation estimated value by described the first frequency deviation estimated value;
Described frequency deviation estimated value acquisition module also, in the time that described the second frequency deviation estimated value is effective value, according to described the second frequency deviation estimated value, obtains frequency deviation estimated value.
In conjunction with second aspect, in the possible execution mode of the first of second aspect, described frequency deviation estimated value acquisition module is also for carrying out frequency shift (FS) to described synchronizing signal, the synchronizing signal after being offset according to the part beyond the integer frequency bias of described the second frequency deviation estimated value; According to the synchronizing signal after described skew and described known time domain sequences, obtain the 3rd frequency deviation estimated value; Using the integer frequency bias of described the second frequency deviation estimated value and described the 3rd frequency deviation estimated value and as frequency deviation estimated value.
In conjunction with second aspect, in the possible execution mode of the second of second aspect, described judge module also, in the time that the difference of the second frequency deviation estimated value of present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is less than predetermined threshold value, determines that the second frequency deviation estimated value of described present frame synchronizing signal is effective value; In the time that the difference of the second frequency deviation estimated value of described present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is not less than described predetermined threshold value, the second frequency deviation estimated value of determining described present frame synchronizing signal is not invalid value.
In conjunction with second aspect, in the third possible execution mode of second aspect, described device also comprises:
Postponement module, be used for for n frame synchronizing signal, in the time that described the second frequency deviation estimated value is not effective value, the second frequency deviation estimated value of described n frame synchronizing signal is postponed, make the second frequency deviation estimated value of described n frame synchronizing signal be deferred to the output stage of the second frequency deviation estimated value of n+1 frame synchronizing signal;
Described judge module is also in the time obtaining the second frequency deviation estimated value of described n+1 frame synchronizing signal, according to the second frequency deviation estimated value of described n frame synchronizing signal and the second frequency deviation estimated value of n+1 frame synchronizing signal, judge whether the second frequency deviation estimated value of described n+1 frame synchronizing signal is effective value.
In conjunction with the third possible execution mode of second aspect, in the 4th kind of possible execution mode of second aspect, described judge module is also for subtracting each other the second frequency deviation estimated value of described n+1 frame synchronizing signal and the second frequency deviation estimated value of described n frame synchronizing signal, and the frequency deviation that obtains n+1 frame synchronizing signal is estimated difference; Estimate difference according to the frequency deviation of described n+1 frame synchronizing signal, described n+1 frame synchronizing signal is adjusted to the described n+1 frame synchronizing signal after being adjusted; N+1 frame synchronizing signal after described adjustment is carried out to filtering adjustment, obtain filtered n+1 frame synchronizing signal; According to described filtered n+1 frame synchronizing signal and described n+1 frame synchronizing signal, carry out frequency deviation estimation, obtain the frequency deviation estimated value of described filtered n+1 frame synchronizing signal; By the second frequency deviation estimated value frequency deviation estimated value of the frequency deviation estimated value of described filtered n+1 frame synchronizing signal and described n frame synchronizing signal and that be retrieved as described n+1 frame synchronizing signal; Whether the second frequency deviation estimated value that judges described n+1 frame synchronizing signal is effective value.
The third aspect, provides a kind of receiver, and described receiver comprises: processor, memory, and described processor is connected with described memory,
Described processor, for according to the synchronizing signal and the known time domain sequences that receive, carries out frequency deviation estimation, obtains the first frequency deviation estimated value;
Described processor also, for according to described the first frequency deviation estimated value, is determined the temporal information of described synchronizing signal, and described temporal information at least comprises the time of reception of described synchronizing signal at receiving terminal;
Described processor also, for according to the phase information of the phase information of described temporal information, known time domain sequences and described synchronizing signal, obtains the phase difference between known time domain sequences and described synchronizing signal;
Described processor also, for according to the phase difference obtaining, obtains the second frequency deviation estimated value;
Described processor is also for judging whether described the second frequency deviation estimated value is effective value;
Described processor also, in the time that described the second frequency deviation estimated value is not effective value, is retrieved as frequency deviation estimated value by described the first frequency deviation estimated value;
Described processor also, in the time that described the second frequency deviation estimated value is effective value, according to described the second frequency deviation estimated value, obtains frequency deviation estimated value.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
Carry out frequency deviation estimation by synchronizing signal and known time domain sequences, obtain the first frequency deviation estimated value, thereby parse the frame head position of this synchronizing signal according to this first frequency deviation estimated value, and according to the temporal information of this frame head position, further carry out smart frequency deviation estimation, obtain the second frequency deviation estimated value, in the time that in communication system, signal to noise ratio is lower, utilize this frequency deviation estimating method from the lower communication system of signal to noise ratio, to obtain synchronizing signal, the line frequency of going forward side by side is estimated partially, obtain frequency deviation estimated value, thereby make transmitting terminal and receiving terminal can reach the synchronous object of signal frequency, make receiving terminal normally demodulation to the received signal, strengthen the performance of communication system.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of frequency deviation estimating method flow chart that the embodiment of the present invention provides;
Fig. 2 is a kind of frequency deviation estimating method flow chart that the embodiment of the present invention provides;
Fig. 3 is the signal that the synchronizing signal that sends of a kind of transmitting terminal that the embodiment of the present invention provides and receiving terminal receive;
Fig. 4 is a kind of frequency deviation estimating method flow chart that the embodiment of the present invention provides;
Fig. 5 is a kind of frequency deviation estimation device structural representation that the embodiment of the present invention provides;
Fig. 6 is a kind of receiver structure schematic diagram that the embodiment of the present invention provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Fig. 1 is a kind of frequency deviation estimating method flow chart that the embodiment of the present invention provides.Referring to Fig. 1, the executive agent of this embodiment is receiver, and the method comprises:
101, receiver, according to the synchronizing signal and the known time domain sequences that receive, carries out frequency deviation estimation, obtains the first frequency deviation estimated value.
102, receiver, according to this first frequency deviation estimated value, is determined the temporal information of this synchronizing signal, and this temporal information at least comprises the time of reception of this synchronizing signal at receiving terminal.
103, receiver, according to the phase information of the phase information of this temporal information, known time domain sequences and this synchronizing signal, obtains the phase difference between known time domain sequences and this synchronizing signal.
104, receiver, according to the phase difference obtaining, obtains the second frequency deviation estimated value.
105, receiver judges whether this second frequency deviation estimated value is effective value; In the time that this second frequency deviation estimated value is not effective value, execution step 106; In the time that this second frequency deviation estimated value is effective value, execution step 107.
106,, in the time that this second frequency deviation estimated value is not effective value, this first frequency deviation estimated value is retrieved as frequency deviation estimated value by receiver.
107,, in the time that this second frequency deviation estimated value is effective value, receiver, according to this second frequency deviation estimated value, obtains frequency deviation estimated value.
The method that the embodiment of the present invention provides, carry out frequency deviation estimation by synchronizing signal and known time domain sequences, obtain the first frequency deviation estimated value, thereby parse the frame head position of this synchronizing signal according to this first frequency deviation estimated value, and according to the temporal information of this frame head position, further carry out smart frequency deviation estimation, obtain the second frequency deviation estimated value, in the time that in communication system, signal to noise ratio is lower, utilize this frequency deviation estimating method from the lower communication system of signal to noise ratio, to obtain synchronizing signal, the line frequency of going forward side by side is estimated partially, obtain frequency deviation estimated value, thereby make transmitting terminal and receiving terminal can reach the synchronous object of signal frequency, make receiving terminal normally demodulation to the received signal, strengthen the performance of communication system.
Fig. 2 is a kind of frequency deviation estimating method flow chart that the embodiment of the present invention provides.Referring to Fig. 2, the executive agent of this embodiment is receiver, and the method comprises:
201, receiver, according to the synchronizing signal and the known time domain sequences that receive, carries out frequency deviation estimation, obtains the first frequency deviation estimated value.
Orthogonal frequency division multiplex OFDM technology is a kind of wider frequency band to be divided into multiple narrower subcarriers, and utilizes the plurality of narrower subcarrier carrying transmission information to realize the technology of wideband transmit.Due to deviation, the Doppler frequency shift of channel etc. between the local carrier frequency of receiving terminal and transmitting terminal can make to receive signal and transmit between produce very large frequency deviation, can cause the interference between subcarrier to the communication system based on OFDM technology like this, therefore, in the time that receiving terminal receives signal, need to the frequency deviation of signal be caught and be followed the tracks of.Wherein, the acquisition phase that frequency deviation is estimated is generally thick frequency deviation estimation stages, and the tracking phase that frequency deviation is estimated is generally smart frequency deviation estimation stages.
This step 201 is specially: between every two OFDM symbols of the synchronizing signal of transmitting terminal, insert known time domain sequences, receiver receives the synchronizing signal with known time domain sequences at receiving terminal, the moment that sends this synchronizing signal from transmitting terminal, according to the length of the synchronizing signal prestoring in this receiver, obtain the signal of the synchronizing signal length that receiving terminal receives, and the signal of the synchronizing signal length receiving according to this synchronizing signal and receiving terminal, carry out correlation computations, obtain correlation.Receiver is determined current in the capturing frequency deviation stage, and according to this capturing frequency deviation stage, obtain filter, model selection parameter etc. and control parameter, now, receiver carries out filtering according to the filter parameter obtaining to the synchronizing signal receiving, and this correlation is exported under the model selection parameter providing, using the correlation of output as the first frequency deviation estimated value.
Wherein, controlling parameter can comprise: digital phase-locked filtering loop parameter, infinite impulse response digital filter parameter, model selection parameter, fault parameter etc.Wherein, model selection parameter comprises two kinds of selectable parameters, be model selection parameter be 0 or model selection parameter be 1, in the time that model selection parameter is 0, the frequency deviation estimated value obtaining is the frequency deviation estimated value obtaining by above-mentioned steps 201, and the outgoing route that is 0 correspondence by this model selection parameter by this frequency deviation estimated value output; In the time that model selection parameter is 1, the frequency deviation estimated value obtaining is the frequency deviation estimated value obtaining by other frequency deviation estimating method except frequency deviation estimating method described in step 201, and the outgoing route that is 1 correspondence by this model selection parameter by this frequency deviation estimated value output.
In the embodiment of the present invention, the filter that the synchronizing signal receiving is carried out to use in the process of filtering according to the filter parameter obtaining is specifically as follows single order or the phase-locked filtering loop of second order numeral.
Synchronizing signal is used for the signal of transmitting terminal and receiving terminal to carry out synchronously, and carries out Cell searching etc.
Known time domain sequences can be leading (Preamble, known periods sequence), the sequence such as pilot tone (Pilot), known pseudo-random signal sequence aperiodic (Sounding), the embodiment of the present invention is that above-mentioned three kinds any do not limit to being inserted into known time domain sequences in synchronizing signal.
202, receiver, according to this first frequency deviation estimated value, is determined the temporal information of this synchronizing signal, and this temporal information at least comprises the time of reception of this synchronizing signal at receiving terminal.
Particularly, the receiving terminal of receiver receives the signal that transmitting terminal sends in real time, and the time of record reception, in the time that receiver obtains the first frequency deviation estimated value, send the time of this synchronizing signal according to the definite frequency shift (FS) of this first frequency deviation estimated value size and transmitting terminal, determine this time of reception corresponding to synchronizing signal frame head position of reception.
For example, Fig. 3 is the signal that the synchronizing signal that sends of a kind of transmitting terminal that the embodiment of the present invention provides and receiving terminal receive.Fig. 3 (a), for the synchronizing signal that transmitting terminal sends, wherein, marks hypographous part and represents known time domain sequences.In the time that receiver receives synchronizing signal, according to the length of this synchronizing signal of storing in this receiver, if the length of this synchronizing signal is L, from the synchronizing signal receiving, send the moment of this synchronizing signal with transmitting terminal, obtain the synchronizing signal that length is L, as Fig. 3 (b).Can find out that by Fig. 3 (a) and Fig. 3 (b) the known time domain sequences in two row synchronizing signals exists certain skew, receiver sends the moment of this synchronizing signal according to the first frequency deviation estimated value obtaining and transmitting terminal, determines the time of reception of the synchronizing signal frame head position that in Fig. 3 (b), transmitting terminal sends.Wherein, the original position that this synchronizing signal frame head position is this frame synchronizing signal.
203, receiver, according to the phase information of the phase information of this temporal information, known time domain sequences and this synchronizing signal, obtains the phase difference between known time domain sequences and this synchronizing signal.
In the situation that ignoring noise effect, can there is a fixing phase difference at transmitting terminal and receiving terminal in the subcarrier that can be identified for synchronous signal transmission.This step 203 is specially: receiver is according to the synchronizing signal receiving and the local known time domain sequences prestoring, obtain respectively the phase information of the synchronizing signal receiving and the phase information of the synchronizing signal that transmitting terminal sends, two phase informations that receiver utilization obtains are done subtraction calculations, the phase difference of the synchronizing signal that the synchronizing signal that obtains receiving and transmitting terminal send.
204, receiver, according to the phase difference obtaining, obtains the second frequency deviation estimated value.
Particularly, receiver is according to the synchronizing signal of the synchronizing signal receiving and the local transmitting terminal transmission prestoring, obtain the cross-correlation energy of corresponding known time domain sequences, and definite phase place corresponding to this cross-correlation energy, there is a fixing phase difference in the synchronizing signal obtaining due to transmitting terminal and receiving terminal, therefore, receiver is according to this cross-correlation energy and this fixing phase difference, obtain the relation between phase place that this fixing phase difference and this cross-correlation energy are corresponding, thereby receiver is according to the relation between phase difference and frequency shift (FS), be φ=π ν, wherein, φ is phase difference, ν is frequency shift (FS), obtain frequency offseting value.Owing to now calculating for the first time the second frequency deviation estimated value for receiver, therefore, the frequency deviation of controlling in parameter estimates that initial value is 0, receiver is input to this synchronizing signal in infinite impulse response digital filter, to carry out filtering, to make the frequency characteristic of this synchronizing signal clear and definite, and this frequency offseting value is retrieved as to the second frequency deviation estimated value.
It should be noted that, this second frequency deviation estimated value comprises integer frequency bias and decimal frequency bias.Wherein, integer frequency bias can not destroy the orthogonality between subcarrier, thereby just can not cause the interference between subcarrier yet, but this integer frequency bias can cause cyclic shift and the phase rotating of the synchronizing signal that receiver receives, and has a strong impact on systematic function; And decimal frequency bias has destroyed the orthogonality between subcarrier, cause between subcarrier and disturbed thus.
205, receiver judges whether this second frequency deviation estimated value is effective value.
In the time that receiver is determined this second frequency deviation estimated value not for effective value, execution step 206;
In the time that receiver determines that this second frequency deviation estimated value is effective value, execution step 207.
Wherein, receiver judges that whether this second frequency deviation estimated value is that the process of effective value can be carried out in the following manner: if when the difference of the frequency deviation estimated value of the second frequency deviation estimated value of present frame synchronizing signal and former frame synchronizing signal is less than predetermined threshold value, determine that this second frequency deviation estimated value is effective value; If when the difference of the frequency deviation estimated value of the second frequency deviation estimated value of present frame synchronizing signal and former frame synchronizing signal is not less than this predetermined threshold value, the second frequency deviation estimated value of determining present frame synchronizing signal is not invalid value.Particularly, receiver is when calculating the frequency deviation estimated value of former frame synchronizing signal, the frequency deviation estimated value of this former frame synchronizing signal can be preserved, in the time that this receiver obtains the second frequency deviation estimated value of present frame synchronizing signal by the step of step 202～204, frequency deviation estimated value comparison with this former frame synchronizing signal, calculate the difference of the second frequency deviation estimated value of present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal, and by this difference and predetermined threshold value comparison, by both magnitude relationship, whether the second frequency deviation estimated value of determining present frame synchronizing signal is effective value.
Wherein, predetermined threshold value can be arranged by technical staff in the time developing, and also can in the process using, be adjusted by user, and the embodiment of the present invention does not limit this.
206,, in the time that this second frequency deviation estimated value is not effective value, this first frequency deviation estimated value is retrieved as frequency deviation estimated value by receiver.
It should be noted that, for n frame synchronizing signal, in the time that this second frequency deviation estimated value is not effective value, receiver postpones the second frequency deviation estimated value of this n frame synchronizing signal, makes the second frequency deviation estimated value of this n frame synchronizing signal be deferred to the output stage of the second frequency deviation estimated value of n+1 frame synchronizing signal, in the time obtaining the second frequency deviation estimated value of this n+1 frame synchronizing signal, according to the second frequency deviation estimated value of this n frame synchronizing signal and the second frequency deviation estimated value of n+1 frame synchronizing signal, whether the second frequency deviation estimated value that judges this n+1 frame synchronizing signal is effective value, this judges that whether the second frequency deviation estimated value of n+1 frame synchronizing signal is that the process of effective value can comprise: the second frequency deviation estimated value of this n+1 frame synchronizing signal and the second frequency deviation estimated value of described n frame synchronizing signal are subtracted each other, the frequency deviation that obtains n+1 frame synchronizing signal is estimated difference, estimate difference according to the frequency deviation of this n+1 frame synchronizing signal, this n+1 frame synchronizing signal is adjusted, this after being adjusted n+1 frame synchronizing signal, n+1 frame synchronizing signal after this adjustment is carried out to filtering adjustment, obtain filtered n+1 frame synchronizing signal, according to this filtered n+1 frame synchronizing signal and this n+1 frame synchronizing signal, carry out frequency deviation estimation, obtain the frequency deviation estimated value of this filtered n+1 frame synchronizing signal, by the second frequency deviation estimated value frequency deviation estimated value of the frequency deviation estimated value of this filtered n+1 frame synchronizing signal and this n frame synchronizing signal and that be retrieved as this n+1 frame synchronizing signal, whether the second frequency deviation estimated value that judges this n+1 frame synchronizing signal is effective value.
Above-mentioned whole process is specifically as follows: in the time that the second frequency deviation estimated value of this n frame synchronizing signal is not effective value, receiver postpones this n frame synchronizing signal, the second frequency deviation estimated value of this n frame synchronizing signal is deferred to n+1 frame synchronizing signal place, in the time that receiver obtains the second frequency deviation estimated value of n+1 frame synchronizing signal, subtract each other with the second frequency deviation estimated value of this n frame synchronizing signal, the frequency deviation that obtains n+1 frame synchronizing signal is estimated difference, receiver is estimated difference according to the frequency deviation of this n+1 frame synchronizing signal, adjust the frequency shift (FS) of n+1 frame synchronizing signal, and utilize infinite impulse response digital filter to carry out filtering to the n+1 frame synchronizing signal of above-mentioned adjustment, after removing unwanted signal, obtain filtered stable n+1 frame synchronizing signal.Receiver utilizes this filtered stable n+1 frame synchronizing signal and n+1 frame synchronizing signal, carry out estimating as the frequency deviation of step 202～204, obtain the frequency deviation estimated value of filtered n+1 frame synchronizing signal, the frequency deviation estimated value of the frequency deviation estimated value of this filtered n+1 frame synchronizing signal and n frame synchronizing signal is carried out read group total by receiver, and the result of read group total is defined as to the second frequency deviation estimated value of this n+1 frame synchronizing signal, receiver judges whether the second frequency deviation estimated value of this n+1 frame synchronizing signal is effective value, carry out the process as step 205, in the time that this second frequency deviation estimated value is not effective value, receiver is proceeded said process according to this n+1 frame synchronizing signal, obtain the second frequency deviation estimated value of n+2 frame synchronizing signal, calculate according to this, until the second frequency deviation estimated value obtaining is effective value, execution step 207.
207,, in the time that this second frequency deviation estimated value is effective value, receiver carries out frequency shift (FS) to this synchronizing signal, the synchronizing signal after being offset according to the part beyond the integer frequency bias of this second frequency deviation estimated value.
Particularly, in the time that receiver determines that the difference of the frequency deviation estimated value of this second frequency deviation estimated value and former frame synchronizing signal is less than predetermined threshold value, the acquisition phase redirect that this receiver is estimated by frequency deviation is the tracking phase that frequency deviation is estimated, and the model selection parameter of controlling in this receiver in parameter is 1, this receiver is the outgoing route output of 1 correspondence by model selection parameter by the effective value of this second frequency deviation estimated value.Now, this receiver utilizes the synchronizing signal with known time domain sequences that the decimal frequency bias of this second frequency deviation estimated value obtains receiving terminal to carry out frequency shift (FS), synchronizing signal after being offset, thereby eliminate decimal frequency bias to this impact with the synchronizing signal of known time domain sequences, make this with only there being integer frequency bias in the synchronizing signal of known time domain sequences.
208, receiver, according to the synchronizing signal after this skew and this known time domain sequences, obtains the 3rd frequency deviation estimated value.
Particularly, receiver, according to the synchronizing signal with known time domain sequences of the synchronizing signal after skew and the local transmitting terminal transmission prestoring, carries out correlation computations, obtains correlation, and this correlation is retrieved as to the 3rd frequency deviation estimated value.
209, receiver using the integer frequency bias of this second frequency deviation estimated value and the 3rd frequency deviation estimated value and as frequency deviation estimated value.
Particularly, receiver obtains the integer frequency bias of the second frequency deviation estimated value, and this integer frequency bias and the 3rd frequency deviation estimated value is added to the frequency deviation estimated value after being added.Now, receiver is deposited module according to the effective value of the second frequency deviation estimated value obtaining to the delay in digital phase-locking phase filtering loop and is upgraded, the acquisition phase that this receiver is estimated by frequency deviation jumps to the slow tracking phase that frequency deviation is estimated, synchronizing signal corresponding frequency deviation estimated value after being added is removed to unwanted signal through digital phase-locked filtering loop, obtain stable synchronizing signal, now, the model selection parameter of controlling in parameter is 0, this receiver is exported the frequency deviation estimated value after this addition according to outgoing route corresponding to this model selection parameter, and using the frequency deviation estimated value after this addition as frequency deviation estimated value.
It should be noted that, receiver carries out correspondence output to frequency deviation estimated value respectively according to the model selection parameter of controlling in parameter, referring to process in step 201～209, thereby obtains according to the frequency deviation estimated value of each frequency deviation estimating method output.
For implementation procedure of the present invention is better described, Fig. 4 is a kind of frequency deviation estimating method flow chart that the embodiment of the present invention provides.Referring to Fig. 4, when the process through step 201, carrying out frequency deviation by synchronizing signal and known time domain sequences estimates while obtaining the first frequency deviation estimated value, now receiver estimates that according to frequency deviation residing acquisition phase obtains digital phase-locked filtering loop parameter and model selection parameter etc. and controls parameter, the synchronizing signal that receiver receives is through digital phase-locked filtering loop filtering, and be the outgoing route output of 0 correspondence in model selection parameter by the first frequency deviation estimated value of this synchronizing signal, receiver is determined after the temporal information of frame head position of synchronizing signal according to this first frequency deviation estimated value, carry out estimating based on the frequency deviation of time synchronized, obtain the second frequency deviation estimated value, and utilize infinite impulse response digital filter to carry out filtering this synchronizing signal, and the outgoing route that is 1 correspondence in model selection parameter sends this second frequency deviation estimated value, now receiver judges whether this second frequency deviation estimated value is effective value, in the time that this second frequency deviation estimated value is effective value, receiver is proceeded to estimate based on the frequency deviation of known time domain sequences, obtain the 3rd frequency deviation estimated value, and the outgoing route that is 0 correspondence by model selection parameter is exported the 3rd frequency deviation estimated value.And in the time that this second frequency deviation estimated value is not effective value, this the second frequency deviation estimated value is delayed to next frame synchronizing signal time of reception by receiver, by working as preamble and next frame synchronizing signal, and utilize the second frequency deviation estimated value of present frame synchronizing signal and the second frequency deviation estimated value of next frame synchronizing signal, carrying out the plus-minus shown in Fig. 4 calculates, further obtain the second frequency deviation estimated value of next frame synchronizing signal, and whether the second frequency deviation estimated value that judges this next frame synchronizing signal is effective value, calculate according to this until finally get the effective value of the second frequency deviation estimated value.
The method that the embodiment of the present invention provides, carry out frequency deviation estimation by synchronizing signal and known time domain sequences, obtain the first frequency deviation estimated value, thereby parse the frame head position of this synchronizing signal according to this first frequency deviation estimated value, and according to the temporal information of this frame head position, further carry out smart frequency deviation estimation, obtain the second frequency deviation estimated value, in the time that in communication system, signal to noise ratio is lower, utilize this frequency deviation estimating method from the lower communication system of signal to noise ratio, to obtain synchronizing signal, the line frequency of going forward side by side is estimated partially, obtain frequency deviation estimated value, thereby make transmitting terminal and receiving terminal can reach the synchronous object of signal frequency, make receiving terminal normally demodulation to the received signal, strengthen the performance of communication system.Further, the effective value of estimating by the second frequency deviation is adjusted the 3rd frequency deviation estimated value, make this frequency deviation estimated value can be in a short period of time in target zone, reduce the time of waiting for, and utilize time domain sequences and timing frequency deviation to estimate the method combining, can guarantee, under very low signal to noise ratio environment, can obtain fast the frequency deviation estimated value in target zone, and guarantee that frequency deviation residual in communication system is in 1ppm.
Fig. 5 is a kind of frequency deviation estimation device structural representation that the embodiment of the present invention provides.Referring to Fig. 5, this device comprises: the first frequency deviation estimated value acquisition module 501, temporal information acquisition module 502, phase difference acquisition module 503, the second frequency deviation estimated value module 504, judge module 505, frequency deviation estimated value acquisition module 506.Wherein, the first frequency deviation estimated value acquisition module 501, for according to the synchronizing signal and the known time domain sequences that receive, carries out frequency deviation estimation, obtains the first frequency deviation estimated value; The first frequency deviation estimated value acquisition module 501 is connected with temporal information acquisition module 502, temporal information acquisition module 502, for according to this first frequency deviation estimated value, determine the temporal information of this synchronizing signal, this temporal information at least comprises the time of reception of this synchronizing signal at receiving terminal; Temporal information acquisition module 502 is connected with phase difference acquisition module 503, phase difference acquisition module 503, for according to the phase information of the phase information of this temporal information, known time domain sequences and this synchronizing signal, obtain the phase difference between known time domain sequences and this synchronizing signal; Phase difference acquisition module 503 is connected with the second frequency deviation estimated value module 504, and the second frequency deviation estimated value module 504, for according to the phase difference obtaining, is obtained the second frequency deviation estimated value; The second frequency deviation estimated value module 504 is connected with judge module 505, and judge module 505, for judging whether this second frequency deviation estimated value is effective value; Judge module 505 is connected with frequency deviation estimated value acquisition module 506, and frequency deviation estimated value acquisition module 506, in the time that this second frequency deviation estimated value is not effective value, is retrieved as frequency deviation estimated value by this first frequency deviation estimated value; This frequency deviation estimated value acquisition module 506 also, in the time that this second frequency deviation estimated value is effective value, according to this second frequency deviation estimated value, obtains frequency deviation estimated value.
Preferably, this frequency deviation estimated value acquisition module 506 is also for carrying out frequency shift (FS) to this synchronizing signal, the synchronizing signal after being offset according to the part beyond the integer frequency bias of this second frequency deviation estimated value; According to the synchronizing signal after this skew and this known time domain sequences, obtain the 3rd frequency deviation estimated value; Using the integer frequency bias of this second frequency deviation estimated value and the 3rd frequency deviation estimated value and as frequency deviation estimated value.
Preferably, this judge module 505 also, in the time that the difference of the second frequency deviation estimated value of present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is less than predetermined threshold value, determines that the second frequency deviation estimated value of this current frame synchronizing signal is effective value; In the time that the difference of the second frequency deviation estimated value of this current frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is not less than this predetermined threshold value, the second frequency deviation estimated value of determining this current frame synchronizing signal is not invalid value.
Preferably, this device also comprises:
Postponement module, be used for for n frame synchronizing signal, in the time that this second frequency deviation estimated value is not effective value, the second frequency deviation estimated value of this n frame synchronizing signal is postponed, make the second frequency deviation estimated value of this n frame synchronizing signal be deferred to the output stage of the second frequency deviation estimated value of n+1 frame synchronizing signal;
This judge module 505 is also in the time obtaining the second frequency deviation estimated value of this n+1 frame synchronizing signal, according to the second frequency deviation estimated value of this n frame synchronizing signal and the second frequency deviation estimated value of n+1 frame synchronizing signal, judge whether the second frequency deviation estimated value of this n+1 frame synchronizing signal is effective value.
Preferably, this judge module 505 is also for subtracting each other the second frequency deviation estimated value of this n+1 frame synchronizing signal and the second frequency deviation estimated value of this n frame synchronizing signal, and the frequency deviation that obtains n+1 frame synchronizing signal is estimated difference; Estimate difference according to the frequency deviation of this n+1 frame synchronizing signal, this n+1 frame synchronizing signal is adjusted to this n+1 frame synchronizing signal after being adjusted; N+1 frame synchronizing signal after this adjustment is carried out to filtering adjustment, obtain filtered n+1 frame synchronizing signal; According to this filtered n+1 frame synchronizing signal and this n+1 frame synchronizing signal, carry out frequency deviation estimation, obtain the frequency deviation estimated value of this filtered n+1 frame synchronizing signal; By the second frequency deviation estimated value frequency deviation estimated value of the frequency deviation estimated value of this filtered n+1 frame synchronizing signal and this n frame synchronizing signal and that be retrieved as this n+1 frame synchronizing signal; Whether the second frequency deviation estimated value that judges this n+1 frame synchronizing signal is effective value.
In sum, the device that the embodiment of the present invention provides, carry out frequency deviation estimation by synchronizing signal and known time domain sequences, obtain the first frequency deviation estimated value, thereby parse the frame head position of this synchronizing signal according to this first frequency deviation estimated value, and according to the temporal information of this frame head position, further carry out smart frequency deviation estimation, obtain the second frequency deviation estimated value, in the time that in communication system, signal to noise ratio is lower, utilize this frequency deviation estimating method from the lower communication system of signal to noise ratio, to obtain synchronizing signal, the line frequency of going forward side by side is estimated partially, obtain frequency deviation estimated value, thereby make transmitting terminal and receiving terminal can reach the synchronous object of signal frequency, make receiving terminal normally demodulation to the received signal, strengthen the performance of communication system.
It should be noted that: the frequency deviation estimation device that above-described embodiment provides is in the time that frequency deviation is estimated, only be illustrated with the division of above-mentioned each functional module, in practical application, can above-mentioned functions be distributed and completed by different functional modules as required, be divided into different functional modules by the internal structure of receiver, to complete all or part of function described above.In addition, the frequency deviation estimation device that above-described embodiment provides and frequency deviation estimating method embodiment belong to same design, and its specific implementation process refers to embodiment of the method, repeats no more here.
Fig. 6 is a kind of receiver structure schematic diagram that the embodiment of the present invention provides.Referring to Fig. 6, this receiver comprises: processor 601, memory 602, and this processor 601 is connected with this memory 602,
This processor 601, for according to the synchronizing signal and the known time domain sequences that receive, carries out frequency deviation estimation, obtains the first frequency deviation estimated value;
This processor 601 also, for according to this first frequency deviation estimated value, is determined the temporal information of this synchronizing signal, and this temporal information at least comprises the time of reception of this synchronizing signal at receiving terminal;
This processor 601 also, for according to the phase information of the phase information of this temporal information, known time domain sequences and this synchronizing signal, obtains the phase difference between known time domain sequences and this synchronizing signal;
This processor 601 also, for according to the phase difference obtaining, obtains the second frequency deviation estimated value;
This processor 601 is also for judging whether this second frequency deviation estimated value is effective value;
This processor 601 also, in the time that this second frequency deviation estimated value is not effective value, is retrieved as frequency deviation estimated value by this first frequency deviation estimated value;
This processor 601 also, in the time that this second frequency deviation estimated value is effective value, according to this second frequency deviation estimated value, obtains frequency deviation estimated value.
Preferably, this processor 601 is also for carrying out frequency shift (FS) to this synchronizing signal, the synchronizing signal after being offset according to the part beyond the integer frequency bias of this second frequency deviation estimated value; According to the synchronizing signal after this skew and this known time domain sequences, obtain the 3rd frequency deviation estimated value; Using the integer frequency bias of this second frequency deviation estimated value and the 3rd frequency deviation estimated value and as frequency deviation estimated value.
Preferably, this processor 601 also, in the time that the difference of the second frequency deviation estimated value of present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is less than predetermined threshold value, determines that the second frequency deviation estimated value of this current frame synchronizing signal is effective value; In the time that the difference of the second frequency deviation estimated value of this current frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is not less than this predetermined threshold value, the second frequency deviation estimated value of determining this current frame synchronizing signal is not invalid value.
Preferably, this processor 601 is also for for n frame synchronizing signal, in the time that this second frequency deviation estimated value is not effective value, the second frequency deviation estimated value of this n frame synchronizing signal is postponed, make the second frequency deviation estimated value of this n frame synchronizing signal be deferred to the output stage of the second frequency deviation estimated value of n+1 frame synchronizing signal; In the time obtaining the second frequency deviation estimated value of this n+1 frame synchronizing signal, according to the second frequency deviation estimated value of this n frame synchronizing signal and the second frequency deviation estimated value of n+1 frame synchronizing signal, judge whether the second frequency deviation estimated value of this n+1 frame synchronizing signal is effective value.
Preferably, this processor 601 is also for subtracting each other the second frequency deviation estimated value of this n+1 frame synchronizing signal and the second frequency deviation estimated value of this n frame synchronizing signal, and the frequency deviation that obtains n+1 frame synchronizing signal is estimated difference; Estimate difference according to the frequency deviation of this n+1 frame synchronizing signal, this n+1 frame synchronizing signal is adjusted to this n+1 frame synchronizing signal after being adjusted; N+1 frame synchronizing signal after this adjustment is carried out to filtering adjustment, obtain filtered n+1 frame synchronizing signal; According to this filtered n+1 frame synchronizing signal and this n+1 frame synchronizing signal, carry out frequency deviation estimation, obtain the frequency deviation estimated value of this filtered n+1 frame synchronizing signal; By the second frequency deviation estimated value frequency deviation estimated value of the frequency deviation estimated value of this filtered n+1 frame synchronizing signal and this n frame synchronizing signal and that be retrieved as this n+1 frame synchronizing signal; Whether the second frequency deviation estimated value that judges this n+1 frame synchronizing signal is effective value.
One of ordinary skill in the art will appreciate that all or part of step that realizes above-described embodiment can complete by hardware, also can carry out the hardware that instruction is relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. a frequency deviation estimating method, is characterized in that, described method comprises:
According to the synchronizing signal receiving and known time domain sequences, carry out frequency deviation estimation, obtain the first frequency deviation estimated value;
According to described the first frequency deviation estimated value, determine the temporal information of described synchronizing signal, described temporal information at least comprises the time of reception of described synchronizing signal at receiving terminal;
According to the phase information of the phase information of described temporal information, known time domain sequences and described synchronizing signal, obtain the phase difference between known time domain sequences and described synchronizing signal;
According to the phase difference obtaining, obtain the second frequency deviation estimated value;
Judge whether described the second frequency deviation estimated value is effective value;
In the time that described the second frequency deviation estimated value is not effective value, described the first frequency deviation estimated value is retrieved as to frequency deviation estimated value;
In the time that described the second frequency deviation estimated value is effective value, according to described the second frequency deviation estimated value, obtain frequency deviation estimated value.
2. method according to claim 1, is characterized in that, according to described the second frequency deviation estimated value, obtains frequency deviation estimated value and comprises:
Described synchronizing signal is carried out to frequency shift (FS), the synchronizing signal after being offset according to the part beyond the integer frequency bias of described the second frequency deviation estimated value;
According to the synchronizing signal after described skew and described known time domain sequences, obtain the 3rd frequency deviation estimated value;
Using the integer frequency bias of described the second frequency deviation estimated value and described the 3rd frequency deviation estimated value and as frequency deviation estimated value.
3. method according to claim 1, is characterized in that, judges whether described the second frequency deviation estimated value is that effective value comprises:
In the time that the difference of the second frequency deviation estimated value of present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is less than predetermined threshold value, determine that the second frequency deviation estimated value of described present frame synchronizing signal is effective value;
In the time that the difference of the second frequency deviation estimated value of described present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is not less than described predetermined threshold value, the second frequency deviation estimated value of determining described present frame synchronizing signal is not invalid value.
4. method according to claim 1, is characterized in that, judges that whether described the second frequency deviation estimated value is after effective value, and described method also comprises:
For n frame synchronizing signal, in the time that described the second frequency deviation estimated value is not effective value, the second frequency deviation estimated value of described n frame synchronizing signal is postponed, make the second frequency deviation estimated value of described n frame synchronizing signal be deferred to the output stage of the second frequency deviation estimated value of n+1 frame synchronizing signal;
In the time obtaining the second frequency deviation estimated value of described n+1 frame synchronizing signal, according to the second frequency deviation estimated value of described n frame synchronizing signal and the second frequency deviation estimated value of n+1 frame synchronizing signal, judge whether the second frequency deviation estimated value of described n+1 frame synchronizing signal is effective value.
5. method according to claim 4, it is characterized in that, according to the second frequency deviation estimated value of described n frame synchronizing signal and the second frequency deviation estimated value of n+1 frame synchronizing signal, judge whether the second frequency deviation estimated value of described n+1 frame synchronizing signal is that effective value comprises:
The second frequency deviation estimated value of described n+1 frame synchronizing signal and the second frequency deviation estimated value of described n frame synchronizing signal are subtracted each other, and the frequency deviation that obtains n+1 frame synchronizing signal is estimated difference;
Estimate difference according to the frequency deviation of described n+1 frame synchronizing signal, described n+1 frame synchronizing signal is adjusted to the described n+1 frame synchronizing signal after being adjusted;
N+1 frame synchronizing signal after described adjustment is carried out to filtering adjustment, obtain filtered n+1 frame synchronizing signal;
According to described filtered n+1 frame synchronizing signal and described n+1 frame synchronizing signal, carry out frequency deviation estimation, obtain the frequency deviation estimated value of described filtered n+1 frame synchronizing signal;
By the second frequency deviation estimated value frequency deviation estimated value of the frequency deviation estimated value of described filtered n+1 frame synchronizing signal and described n frame synchronizing signal and that be retrieved as described n+1 frame synchronizing signal;
Whether the second frequency deviation estimated value that judges described n+1 frame synchronizing signal is effective value.
6. a frequency deviation estimation device, is characterized in that, described device comprises:
The first frequency deviation estimated value acquisition module, for according to the synchronizing signal and the known time domain sequences that receive, carries out frequency deviation estimation, obtains the first frequency deviation estimated value;
Temporal information acquisition module, for according to described the first frequency deviation estimated value, determines the temporal information of described synchronizing signal, and described temporal information at least comprises the time of reception of described synchronizing signal at receiving terminal;
Phase difference acquisition module, for according to the phase information of the phase information of described temporal information, known time domain sequences and described synchronizing signal, obtains the phase difference between known time domain sequences and described synchronizing signal;
The second frequency deviation estimated value module, for according to the phase difference obtaining, obtains the second frequency deviation estimated value;
Judge module, for judging whether described the second frequency deviation estimated value is effective value;
Frequency deviation estimated value acquisition module, in the time that described the second frequency deviation estimated value is not effective value, is retrieved as frequency deviation estimated value by described the first frequency deviation estimated value;
Described frequency deviation estimated value acquisition module also, in the time that described the second frequency deviation estimated value is effective value, according to described the second frequency deviation estimated value, obtains frequency deviation estimated value.
7. device according to claim 6, is characterized in that, described frequency deviation estimated value acquisition module is also for carrying out frequency shift (FS) to described synchronizing signal, the synchronizing signal after being offset according to the part beyond the integer frequency bias of described the second frequency deviation estimated value; According to the synchronizing signal after described skew and described known time domain sequences, obtain the 3rd frequency deviation estimated value; Using the integer frequency bias of described the second frequency deviation estimated value and described the 3rd frequency deviation estimated value and as frequency deviation estimated value.
8. device according to claim 6, it is characterized in that, described judge module also, in the time that the difference of the second frequency deviation estimated value of present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is less than predetermined threshold value, determines that the second frequency deviation estimated value of described present frame synchronizing signal is effective value; In the time that the difference of the second frequency deviation estimated value of described present frame synchronizing signal and the frequency deviation estimated value of former frame synchronizing signal is not less than described predetermined threshold value, the second frequency deviation estimated value of determining described present frame synchronizing signal is not invalid value.
9. device according to claim 6, is characterized in that, described device also comprises:
Postponement module, be used for for n frame synchronizing signal, in the time that described the second frequency deviation estimated value is not effective value, the second frequency deviation estimated value of described n frame synchronizing signal is postponed, make the second frequency deviation estimated value of described n frame synchronizing signal be deferred to the output stage of the second frequency deviation estimated value of n+1 frame synchronizing signal;
Described judge module is also in the time obtaining the second frequency deviation estimated value of described n+1 frame synchronizing signal, according to the second frequency deviation estimated value of described n frame synchronizing signal and the second frequency deviation estimated value of n+1 frame synchronizing signal, judge whether the second frequency deviation estimated value of described n+1 frame synchronizing signal is effective value.
10. device according to claim 9, it is characterized in that, described judge module is also for subtracting each other the second frequency deviation estimated value of described n+1 frame synchronizing signal and the second frequency deviation estimated value of described n frame synchronizing signal, and the frequency deviation that obtains n+1 frame synchronizing signal is estimated difference; Estimate difference according to the frequency deviation of described n+1 frame synchronizing signal, described n+1 frame synchronizing signal is adjusted to the described n+1 frame synchronizing signal after being adjusted; N+1 frame synchronizing signal after described adjustment is carried out to filtering adjustment, obtain filtered n+1 frame synchronizing signal; According to described filtered n+1 frame synchronizing signal and described n+1 frame synchronizing signal, carry out frequency deviation estimation, obtain the frequency deviation estimated value of described filtered n+1 frame synchronizing signal; By the second frequency deviation estimated value frequency deviation estimated value of the frequency deviation estimated value of described filtered n+1 frame synchronizing signal and described n frame synchronizing signal and that be retrieved as described n+1 frame synchronizing signal; Whether the second frequency deviation estimated value that judges described n+1 frame synchronizing signal is effective value.
11. 1 kinds of receivers, is characterized in that, described receiver comprises: processor, memory, and described processor is connected with described memory,
Described processor, for according to the synchronizing signal and the known time domain sequences that receive, carries out frequency deviation estimation, obtains the first frequency deviation estimated value;
Described processor also, for according to described the first frequency deviation estimated value, is determined the temporal information of described synchronizing signal, and described temporal information at least comprises the time of reception of described synchronizing signal at receiving terminal;
Described processor also, for according to the phase information of the phase information of described temporal information, known time domain sequences and described synchronizing signal, obtains the phase difference between known time domain sequences and described synchronizing signal;
Described processor also, for according to the phase difference obtaining, obtains the second frequency deviation estimated value;
Described processor is also for judging whether described the second frequency deviation estimated value is effective value;
Described processor also, in the time that described the second frequency deviation estimated value is not effective value, is retrieved as frequency deviation estimated value by described the first frequency deviation estimated value;
Described processor also, in the time that described the second frequency deviation estimated value is effective value, according to described the second frequency deviation estimated value, obtains frequency deviation estimated value.
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