CN103873415B - Frequency deviation estimating method, device and receiver - Google Patents
Frequency deviation estimating method, device and receiver Download PDFInfo
- Publication number
- CN103873415B CN103873415B CN201410088706.8A CN201410088706A CN103873415B CN 103873415 B CN103873415 B CN 103873415B CN 201410088706 A CN201410088706 A CN 201410088706A CN 103873415 B CN103873415 B CN 103873415B
- Authority
- CN
- China
- Prior art keywords
- offset estimation
- synchronizing signal
- estimation value
- value
- frame synchronizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention discloses a kind of frequency deviation estimating method, device and receiver, belong to communication technical field.Methods described includes：According to the synchronizing signal for receiving and known time domain sequences, offset estimation is carried out, obtain the first offset estimation value；According to the first offset estimation value, the temporal information of the synchronizing signal is determined；According to the phase information of the temporal information, the phase information of known time domain sequences and the synchronizing signal, known phase difference between time domain sequences and the synchronizing signal is obtained；According to the phase difference for obtaining, the second offset estimation value is obtained；Judge whether the second offset estimation value is virtual value；When the second offset estimation value is not virtual value, the first offset estimation value is retrieved as offset estimation value；When the second offset estimation value is virtual value, according to the second offset estimation value, offset estimation value is obtained.The present invention carries out offset estimation by synchronizing signal and known time domain sequences so that receiving terminal can be demodulated normally to the signal for receiving.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of frequency deviation estimating method, device and receiver.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology is one
Special Multicarrier Transmission Technology is planted, i.e., user profile is transmitted using multiple subcarriers, and OFDM technology is employed
Orthogonal sub-carriers carry out carrying information and distinguish subchannel.Require that each subcarrier is mutually orthogonal just because of OFDM technology, therefore,
The signal frequency synchronization of communication system requirements receiving terminal and transmitting terminal based on OFDM technology, is so accomplished by entering line frequency to signal
Estimate partially, the synchronous purpose of the signal frequency in order to reach receiving terminal and transmitting terminal by offset estimation.
Usually, offset estimation can be based on leading (Preamble, it is known that periodic sequence), pilot tone (Pilot), known
The known time domain sequences such as aperiodic pseudo-random signal sequences (Sounding) are carried out, i.e., sent for signal synchronization in transmitting terminal
During synchronizing signal, the known time domain sequences are added in synchronizing signal, when receiving terminal receives the synchronizing signal, from the synchronization
The known time domain sequences are obtained in signal, offset estimation is carried out, so as to obtain offset estimation value.
Realize it is of the invention during, inventor find prior art at least there is problems with：
During offset estimation, the target zone of signal frequency deviation can be typically predefined, when accessed frequency deviation
Estimate is fallen within when in the target zone, could accurately be demodulated to receiving signal according to the offset estimation value, and is led to
Cross above-mentioned frequency excursion algorithm and carry out the offset estimation value that offset estimation obtains and be difficult in the target zone, so that
Obtain transmitting terminal and receiving terminal is unable to reach the synchronous purpose of signal frequency, the proper solution of signal of the influence receiving terminal to receiving
Adjust, cause the performance of communication system drastically to decline.
The content of the invention
In order to solve problem of the prior art, a kind of frequency deviation estimating method, device and reception are the embodiment of the invention provides
Machine.The technical scheme is as follows：
First aspect, there is provided a kind of frequency deviation estimating method, methods described includes：
According to the synchronizing signal for receiving and known time domain sequences, offset estimation is carried out, obtain the first offset estimation value；
According to the first offset estimation value, the temporal information of the synchronizing signal is determined, the temporal information is at least wrapped
Include reception time of the synchronizing signal in receiving terminal；
According to the phase information of the temporal information, the phase information of known time domain sequences and the synchronizing signal, obtain
Phase difference between known time domain sequences and the synchronizing signal；
According to the phase difference for obtaining, the second offset estimation value is obtained；
Judge whether the second offset estimation value is virtual value；
When the second offset estimation value is not virtual value, the first offset estimation value is retrieved as offset estimation
Value；
When the second offset estimation value is virtual value, according to the second offset estimation value, offset estimation value is obtained.
With reference in a first aspect, in the first possible implementation method of first aspect, according to second offset estimation
Value, obtaining offset estimation value includes：
The part beyond integer frequency bias according to the second offset estimation value carries out frequency shift (FS) to the synchronizing signal,
Synchronizing signal after being offset；
According to the synchronizing signal after the skew and the known time domain sequences, the 3rd offset estimation value is obtained；
Using the integer frequency bias of the second offset estimation value and the 3rd offset estimation value and as offset estimation value.
With reference in a first aspect, in second possible implementation method of first aspect, judging second offset estimation
Whether value is that virtual value includes：
When the second offset estimation value of current frame synchronizing signal is small with the difference of the offset estimation value of previous frame synchronizing signal
When predetermined threshold value, the second offset estimation value for determining the current frame synchronizing signal is virtual value；
When the difference of the second offset estimation value and the offset estimation value of previous frame synchronizing signal of the current frame synchronizing signal
When value is not less than the predetermined threshold value, the second offset estimation value for determining the current frame synchronizing signal is invalid value.
With reference in a first aspect, in the third possible implementation method of first aspect, judging second offset estimation
After whether value is virtual value, methods described also includes：
For n-th frame synchronizing signal, when the second offset estimation value is not virtual value, the n-th frame is synchronously believed
Number the second offset estimation value postponed so that the second offset estimation value of the n-th frame synchronizing signal is deferred to the (n+1)th frame
The output stage of the second offset estimation value of synchronizing signal；
When the second offset estimation value of (n+1)th frame synchronizing signal is obtained, according to the of the n-th frame synchronizing signal
Second offset estimation value of two offset estimation values and the (n+1)th frame synchronizing signal, judges the second frequency of (n+1)th frame synchronizing signal
Whether inclined estimate is virtual value.
With reference to the third possible implementation method of first aspect, in the 4th kind of possible implementation method of first aspect
In, the second offset estimation value of the second offset estimation value and the (n+1)th frame synchronizing signal according to the n-th frame synchronizing signal is sentenced
Whether the second offset estimation value of (n+1)th frame synchronizing signal of breaking is that virtual value includes：
Second offset estimation value of (n+1)th frame synchronizing signal and the second frequency deviation of the n-th frame synchronizing signal are estimated
Evaluation subtracts each other, and obtains the offset estimation difference of the (n+1)th frame synchronizing signal；
According to the offset estimation difference of (n+1)th frame synchronizing signal, (n+1)th frame synchronizing signal is adjusted,
(n+1)th frame synchronizing signal after being adjusted；
The (n+1)th frame synchronizing signal after the adjustment is filtered adjustment, filtered (n+1)th frame synchronization letter is obtained
Number；
According to filtered (n+1)th frame synchronizing signal and (n+1)th frame synchronizing signal, offset estimation is carried out, obtained
To the offset estimation value of filtered (n+1)th frame synchronizing signal；
The frequency deviation of the offset estimation value of filtered (n+1)th frame synchronizing signal and the n-th frame synchronizing signal is estimated
The second offset estimation value that is evaluation and being retrieved as (n+1)th frame synchronizing signal；
Whether the second offset estimation value for judging (n+1)th frame synchronizing signal is virtual value.
Second aspect, there is provided a kind of frequency deviation estimation device, described device includes：
First offset estimation value acquisition module, for according to the synchronizing signal and known time domain sequences for receiving, entering line frequency
Estimate partially, obtain the first offset estimation value；
Temporal information acquisition module, for according to the first offset estimation value, determining the time letter of the synchronizing signal
Breath, the temporal information at least includes reception time of the synchronizing signal in receiving terminal；
Phase difference acquisition module, for according to the temporal information, the phase information of known time domain sequences and the synchronization
The phase information of signal, obtains known phase difference between time domain sequences and the synchronizing signal；
Second offset estimation value module, for according to the phase difference for obtaining, obtaining the second offset estimation value；
Judge module, for judging whether the second offset estimation value is virtual value；
Offset estimation value acquisition module, for when the second offset estimation value is not virtual value, by the described first frequency
Inclined estimate is retrieved as offset estimation value；
The offset estimation value acquisition module is additionally operable to when the second offset estimation value is virtual value, according to described the
Two offset estimation values, obtain offset estimation value.
With reference to second aspect, in the first possible implementation method of second aspect, the offset estimation value obtains mould
The part that block is additionally operable to beyond the integer frequency bias according to the second offset estimation value carries out frequency shift (FS) to the synchronizing signal,
Synchronizing signal after being offset；According to the synchronizing signal after the skew and the known time domain sequences, the 3rd frequency deviation is obtained
Estimate；Using the integer frequency bias of the second offset estimation value and the 3rd offset estimation value and as offset estimation value.
With reference to second aspect, in second possible implementation method of second aspect, the judge module is additionally operable to work as
Second offset estimation value of current frame synchronizing signal is less than predetermined threshold value with the difference of the offset estimation value of previous frame synchronizing signal
When, the second offset estimation value for determining the current frame synchronizing signal is virtual value；When the second of the current frame synchronizing signal
When offset estimation value is not less than the predetermined threshold value with the difference of the offset estimation value of previous frame synchronizing signal, determine described current
Second offset estimation value of frame synchronizing signal is not virtual value.
With reference to second aspect, in the third possible implementation method of second aspect, described device also includes：
Postponement module, for for n-th frame synchronizing signal, when the second offset estimation value is not virtual value, by institute
The the second offset estimation value for stating n-th frame synchronizing signal is postponed so that the second offset estimation value of the n-th frame synchronizing signal
It is deferred to the output stage of the second offset estimation value of the (n+1)th frame synchronizing signal；
The judge module is additionally operable to when the second offset estimation value of (n+1)th frame synchronizing signal is obtained, according to institute
The second offset estimation value of n-th frame synchronizing signal and the second offset estimation value of the (n+1)th frame synchronizing signal are stated, judge described n-th+
Whether the second offset estimation value of 1 frame synchronizing signal is virtual value.
With reference to the third possible implementation method of second aspect, in the 4th kind of possible implementation method of second aspect
In, the judge module is additionally operable to the second offset estimation value of (n+1)th frame synchronizing signal and the n-th frame synchronizing signal
The second offset estimation value subtract each other, obtain the offset estimation difference of the (n+1)th frame synchronizing signal；Believed according to (n+1)th frame synchronization
Number offset estimation difference, (n+1)th frame synchronizing signal is adjusted, (n+1)th frame synchronization after being adjusted letter
Number；The (n+1)th frame synchronizing signal after the adjustment is filtered adjustment, filtered (n+1)th frame synchronizing signal is obtained；According to
Filtered (n+1)th frame synchronizing signal and (n+1)th frame synchronizing signal, carry out offset estimation, after obtaining the filtering
The (n+1)th frame synchronizing signal offset estimation value；By the offset estimation value of filtered (n+1)th frame synchronizing signal and described
The second offset estimation value that the is offset estimation value of n-th frame synchronizing signal and being retrieved as (n+1)th frame synchronizing signal；Judge institute
Whether the second offset estimation value for stating the (n+1)th frame synchronizing signal is virtual value.
The third aspect, there is provided a kind of receiver, the receiver includes：Processor, memory, the processor and institute
Memory is stated to be connected,
The processor, for according to the synchronizing signal and known time domain sequences that receive, carrying out offset estimation, obtains the
One offset estimation value；
The processor is additionally operable to, according to the first offset estimation value, determine the temporal information of the synchronizing signal, institute
Stating temporal information at least includes reception time of the synchronizing signal in receiving terminal；
The processor is additionally operable to according to the temporal information, the phase information of known time domain sequences and the synchronizing signal
Phase information, obtain known phase difference between time domain sequences and the synchronizing signal；
The processor is additionally operable to, according to the phase difference for obtaining, obtain the second offset estimation value；
The processor is additionally operable to judge whether the second offset estimation value is virtual value；
The processor is additionally operable to when the second offset estimation value is not virtual value, by the first offset estimation value
It is retrieved as offset estimation value；
The processor is additionally operable to when the second offset estimation value is virtual value, according to second offset estimation
Value, obtains offset estimation value.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
Offset estimation is carried out by synchronizing signal and known time domain sequences, the first offset estimation value is obtained, so that according to this
First offset estimation value parses the frame header position of the synchronizing signal, and according to the temporal information of the frame header position, further enters
Row essence offset estimation, obtains the second offset estimation value, when signal to noise ratio is relatively low in communication system, can using the frequency deviation estimating method
To obtain synchronizing signal from the relatively low communication system of signal to noise ratio, and offset estimation is carried out, obtain offset estimation value, so that
Transmitting terminal and receiving terminal can reach the synchronous purpose of signal frequency so that receiving terminal can be with proper solution to the signal for receiving
Adjust, enhance the performance of communication system.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of frequency deviation estimating method flow chart provided in an embodiment of the present invention；
Fig. 2 is a kind of frequency deviation estimating method flow chart provided in an embodiment of the present invention；
Fig. 3 is the signal that the synchronizing signal that a kind of transmitting terminal provided in an embodiment of the present invention sends and receiving terminal are received；
Fig. 4 is a kind of frequency deviation estimating method flow chart provided in an embodiment of the present invention；
Fig. 5 is a kind of frequency deviation estimation device structural representation provided in an embodiment of the present invention；
Fig. 6 is a kind of receiver structure schematic diagram provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is a kind of frequency deviation estimating method flow chart provided in an embodiment of the present invention.Referring to Fig. 1, the execution of the embodiment
Main body is receiver, and the method includes：
101st, receiver carries out offset estimation according to the synchronizing signal for receiving and known time domain sequences, obtains the first frequency
Inclined estimate.
102nd, receiver determines the temporal information of the synchronizing signal according to the first offset estimation value, and the temporal information is extremely
Include reception time of the synchronizing signal in receiving terminal less.
103rd, receiver is believed according to the phase of the temporal information, the phase information of known time domain sequences and the synchronizing signal
Breath, obtains known phase difference between time domain sequences and the synchronizing signal.
104th, receiver obtains the second offset estimation value according to the phase difference for obtaining.
105th, receiver judges whether the second offset estimation value is virtual value；When the second offset estimation value is not effective
During value, step 106 is performed；When the second offset estimation value is virtual value, step 107 is performed.
106th, when the second offset estimation value is not virtual value, the first offset estimation value is retrieved as frequency deviation by receiver
Estimate.
107th, when the second offset estimation value is virtual value, receiver obtains frequency deviation according to the second offset estimation value
Estimate.
Method provided in an embodiment of the present invention, offset estimation is carried out by synchronizing signal and known time domain sequences, obtains
One offset estimation value, so as to parse the frame header position of the synchronizing signal according to the first offset estimation value, and according to the frame head
The temporal information of position, further carries out smart offset estimation, obtains the second offset estimation value, when signal to noise ratio is relatively low in communication system
When, synchronizing signal can be obtained from the relatively low communication system of signal to noise ratio using the frequency deviation estimating method, and offset estimation is carried out,
Offset estimation value is obtained, so that transmitting terminal and receiving terminal can reach the synchronous purpose of signal frequency so that receiving terminal pair
The signal for receiving can be demodulated normally, enhance the performance of communication system.
Fig. 2 is a kind of frequency deviation estimating method flow chart provided in an embodiment of the present invention.Referring to Fig. 2, the execution of the embodiment
Main body is receiver, and the method includes：
201st, receiver carries out offset estimation according to the synchronizing signal for receiving and known time domain sequences, obtains the first frequency
Inclined estimate.
Orthogonal frequency division multiplex OFDM technology be it is a kind of frequency band wider is divided into multiple narrower subcarriers, it is and many using this
Individual narrower subcarrier carries the technology that transmission information realizes broadband transmission.Due between receiving terminal and the local carrier frequency of transmitting terminal
Deviation, the Doppler frequency shift of channel etc. can cause to receive between signal and transmission signal and produce very big frequency deviation, so can be right
Communication system based on OFDM technology causes the interference between subcarrier, therefore, when receiving terminal receives signal, it is necessary to letter
Number frequency deviation captured and tracked.Wherein, the acquisition phase of offset estimation is generally the coarse frequency offset stage, offset estimation
Tracking phase is generally the smart offset estimation stage.
The step 201 is specially：Known time domain sequence is inserted between each two OFDM symbol of the synchronizing signal of transmitting terminal
Row, receiver receives the synchronizing signal with known time domain sequences in receiving terminal, and the moment of the synchronizing signal is sent from transmitting terminal
Start, according to the length of the synchronizing signal prestored in the receiver, obtain the signal of the synchronizing signal length that receiving terminal is received,
And the signal of the synchronizing signal length received according to the synchronizing signal and receiving terminal, correlation computations are carried out, obtain correlation.Connect
Receipts machine determines to be currently at the capturing frequency deviation stage, and according to the capturing frequency deviation stage, obtains the control such as wave filter, mode selection parameter
Parameter processed, now, receiver is filtered according to the filter parameter for obtaining to the synchronizing signal for receiving, and by the correlation
Exported under the mode selection parameter for providing, the correlation that will be exported is used as the first offset estimation value.
Wherein, control parameter can include：Digital servo-control filtering loop parameter, infinite impulse response digital filter ginseng
Number, mode selection parameter, fault parameter etc..Wherein, mode selection parameter includes two kinds of selectable parameters, i.e. model selection ginseng
Number is 0 or mode selection parameter is 1, and when mode selection parameter is 0, the offset estimation value for obtaining is by above-mentioned steps 201
The offset estimation value for obtaining, and it is that 0 corresponding outgoing route is exported that the offset estimation value is passed through into the mode selection parameter；Work as mould
When formula selection parameter is 1, the offset estimation value for obtaining is to be estimated by other frequency deviations in addition to frequency deviation estimating method described in step 201
The offset estimation value that meter method is obtained, and it is that 1 corresponding outgoing route is defeated that the offset estimation value is passed through into the mode selection parameter
Go out.
In the embodiment of the present invention, during being filtered to the synchronizing signal for receiving according to the filter parameter for obtaining
The wave filter for being used is specifically as follows single order or second order digital lock phase filtering loop.
Synchronizing signal is used to synchronize the signal of transmitting terminal and receiving terminal, and carries out cell searching etc..
Known time domain sequences can be leading (Preamble, it is known that periodic sequence), pilot tone (Pilot), known aperiodic
The sequences such as pseudo-random signal sequences (Sounding), the embodiment of the present invention is to the known time domain sequences being inserted into synchronizing signal
Above-mentioned three kinds any does not limit.
202nd, receiver determines the temporal information of the synchronizing signal according to the first offset estimation value, and the temporal information is extremely
Include reception time of the synchronizing signal in receiving terminal less.
Specifically, the signal that the receiving terminal real-time reception transmitting terminal of receiver sends, and the time of reception is recorded, work as reception
When machine obtains the first offset estimation value, it is same that the frequency shift (FS) size and transmitting terminal determined according to the first offset estimation value send this
The time of signal is walked, it is determined that receiving the synchronizing signal frame header position corresponding reception time.
For example, Fig. 3 is the synchronizing signal that a kind of transmitting terminal provided in an embodiment of the present invention sends and receiving terminal receiving
Signal.Fig. 3 (a) is the synchronizing signal that transmitting terminal sends, wherein, mark hypographous part and represent known time domain sequences.Work as reception
When machine receives synchronizing signal, according to the length of the synchronizing signal stored in the receiver, if the length of the synchronizing signal is
L, then from the synchronizing signal for receiving, the moment of the synchronizing signal is sent with transmitting terminal, and it is the synchronous letter of L to obtain length
Number, such as Fig. 3 (b).Can be seen that the known time domain sequences in two row synchronizing signals are present by Fig. 3 (a) and Fig. 3 (b) certain
Skew, then receiver sends the moment of the synchronizing signal according to the first offset estimation value and transmitting terminal that obtain, determines Fig. 3 (b)
The reception time of the synchronizing signal frame header position that middle transmitting terminal sends.Wherein, the synchronizing signal frame header position is frame synchronization letter
Number original position.
203rd, receiver is believed according to the phase of the temporal information, the phase information of known time domain sequences and the synchronizing signal
Breath, obtains known phase difference between time domain sequences and the synchronizing signal.
In the case where influence of noise is ignored, it may be determined that for synchronous signal transmission subcarrier in transmitting terminal and reception
Can there is a fixed phase difference in end.The step 203 is specially：Receiver is according to the synchronizing signal for receiving and locally prestores
Known time domain sequences, obtain respectively the synchronizing signal for receiving phase information and transmitting terminal send synchronizing signal phase
Information, receiver does subtraction calculations using two phase informations for obtaining, and the synchronizing signal and transmitting terminal for being received send
Synchronizing signal phase difference.
204th, receiver obtains the second offset estimation value according to the phase difference for obtaining.
Specifically, the synchronizing signal that receiver sends according to the synchronizing signal for receiving and the transmitting terminal for locally prestoring, obtains
To the cross-correlation energy of the known time domain sequences of correspondence, and the corresponding phase of cross-correlation energy is determined, due to transmitting terminal and reception
There is a fixed phase difference in the synchronizing signal that end obtains, therefore, receiver is according to the cross-correlation energy and the phase of the fixation
Potential difference, obtains the relation between the phase difference phase corresponding with the cross-correlation energy of the fixation, so that receiver is according to phase
Relation between difference and frequency shift (FS), i.e. φ=π ν, wherein, φ is phase difference, and ν is frequency shift (FS), obtains frequency offseting value.By
It is that receiver is calculated the second offset estimation value for the first time in now, therefore, the offset estimation initial value in control parameter is 0,
Then be input to the synchronizing signal in infinite impulse response digital filter and be filtered by receiver, to cause the synchronizing signal
The frequency offseting value clearly, and is retrieved as the second offset estimation value by frequency characteristic.
It should be noted that the second offset estimation value includes integer frequency bias and decimal frequency bias.Wherein, integer frequency bias will not
Orthogonality between destruction subcarrier, so that would not also cause the interference between subcarrier, but the integer frequency bias can cause
The cyclic shift and phase place of the synchronizing signal that receiver is received, have a strong impact on systematic function；And decimal frequency bias are destroyed
Orthogonality between subcarrier, thus causes inter-sub-carrier interference.
205th, receiver judges whether the second offset estimation value is virtual value.
When it is not virtual value that receiver determines the second offset estimation value, step 206 is performed；
When it is virtual value that receiver determines the second offset estimation value, step 207 is performed.
Wherein, receiver judges whether the second offset estimation value is that the process of virtual value can be entered in the following manner
OK：If the second offset estimation value of current frame synchronizing signal is less than pre- with the difference of the offset estimation value of previous frame synchronizing signal
If during threshold value, determining that the second offset estimation value is virtual value；If the second offset estimation value of current frame synchronizing signal with it is preceding
When the difference of the offset estimation value of one frame synchronizing signal is not less than the predetermined threshold value, it is determined that the second frequency deviation of current frame synchronizing signal
Estimate is not virtual value.Specifically, when receiver is by the offset estimation value that is calculated previous frame synchronizing signal, can be by
The offset estimation value of the previous frame synchronizing signal is preserved, and it is same to obtain present frame the step of the receiver is by step 202~204
When walking the second offset estimation value of signal, compare with the offset estimation value of the previous frame synchronizing signal, calculate current frame synchronization letter
Number the second offset estimation value and the offset estimation value of previous frame synchronizing signal difference, and by the difference and predetermined threshold value ratio
Compared with by both magnitude relationships, it is determined that whether the second offset estimation value of current frame synchronizing signal is virtual value.
Wherein, predetermined threshold value can be set by technical staff in exploitation, it is also possible to be adjusted during use by user
Whole, the embodiment of the present invention is not limited this.
206th, when the second offset estimation value is not virtual value, the first offset estimation value is retrieved as frequency deviation by receiver
Estimate.
It should be noted that n-th frame synchronizing signal is directed to, and when the second offset estimation value is not virtual value, receiver
Second offset estimation value of the n-th frame synchronizing signal is postponed so that the second offset estimation value of the n-th frame synchronizing signal
It is deferred to the output stage of the second offset estimation value of the (n+1)th frame synchronizing signal；When obtaining the second of (n+1)th frame synchronizing signal
During offset estimation value, the second frequency deviation of the second offset estimation value and the (n+1)th frame synchronizing signal according to the n-th frame synchronizing signal is estimated
Evaluation, whether the second offset estimation value for judging (n+1)th frame synchronizing signal is virtual value, the frame synchronizing signal of judgement (n+1)th
The second offset estimation value whether be that the process of virtual value can include：By the second offset estimation of (n+1)th frame synchronizing signal
Value is subtracted each other with the second offset estimation value of the n-th frame synchronizing signal, obtains the offset estimation difference of the (n+1)th frame synchronizing signal,
Offset estimation difference according to (n+1)th frame synchronizing signal, is adjusted, after being adjusted to (n+1)th frame synchronizing signal
(n+1)th frame synchronizing signal；The (n+1)th frame synchronizing signal after this is adjusted is filtered adjustment, obtains filtered (n+1)th frame
Synchronizing signal；According to filtered (n+1)th frame synchronizing signal and (n+1)th frame synchronizing signal, offset estimation is carried out, be somebody's turn to do
The offset estimation value of filtered (n+1)th frame synchronizing signal；By the offset estimation value of filtered (n+1)th frame synchronizing signal and
The second offset estimation value that the is offset estimation value of the n-th frame synchronizing signal and being retrieved as (n+1)th frame synchronizing signal；Judging should
Whether the second offset estimation value of the (n+1)th frame synchronizing signal is virtual value.
Above-mentioned whole process is specifically as follows：When the second offset estimation value of the n-th frame synchronizing signal is not virtual value,
Receiver is postponed the n-th frame synchronizing signal, and the second offset estimation value of the n-th frame synchronizing signal is deferred into (n+1)th
At frame synchronizing signal, when receiver obtains the second offset estimation value of the (n+1)th frame synchronizing signal, with the n-th frame synchronizing signal
The second offset estimation value subtract each other, obtain the offset estimation difference of the (n+1)th frame synchronizing signal, receiver is same according to (n+1)th frame
The offset estimation difference of signal is walked, the frequency shift (FS) of the (n+1)th frame synchronizing signal is adjusted, and to the (n+1)th frame synchronization of above-mentioned adjustment
Signal is filtered using infinite impulse response digital filter, is removed after garbage signal, obtains the n-th of filtered stabilization
+ 1 frame synchronizing signal.Receiver is carried out using (n+1)th frame synchronizing signal and the (n+1)th frame synchronizing signal of the filtered stabilization
Such as the offset estimation of step 202~204, the offset estimation value of filtered (n+1)th frame synchronizing signal is obtained, receiver filters this
The offset estimation value of the (n+1)th frame synchronizing signal after ripple and the offset estimation value of n-th frame synchronizing signal carry out read group total, and will
The result of read group total is defined as the second offset estimation value of (n+1)th frame synchronizing signal, and receiver judges (n+1)th frame synchronization
Whether the second offset estimation value of signal is virtual value, that is, carry out the process such as step 205, when the second offset estimation value is not
During virtual value, receiver proceeds said process according to (n+1)th frame synchronizing signal, obtains the of the n-th+2 frame synchronizing signal
Two offset estimation values, are calculated according to this, until the second offset estimation value for obtaining is virtual value, perform step 207.
207th, when the second offset estimation value is virtual value, integer frequency bias of the receiver according to the second offset estimation value
Part in addition carries out frequency shift (FS) to the synchronizing signal, the synchronizing signal after being offset.
Specifically, when receiver determines the difference of the second offset estimation value and the offset estimation value of previous frame synchronizing signal
During less than predetermined threshold value, the receiver is redirected the tracking phase for offset estimation by the acquisition phase of offset estimation, and this connects
Mode selection parameter in receipts machine in control parameter is 1, then the virtual value of the second offset estimation value is passed through mould by the receiver
Formula selection parameter is 1 corresponding outgoing route output.Now, the receiver utilizes the decimal frequency bias pair of the second offset estimation value
The synchronizing signal with known time domain sequences that receiving terminal is obtained carries out frequency shift (FS), the synchronizing signal after being offset, so that
Eliminate influence of the decimal frequency bias to the synchronizing signal with known time domain sequences so that the synchronization of known time domain sequences should be carried
Integer frequency bias are only existed in signal.
208th, receiver obtains the 3rd offset estimation value according to the synchronizing signal after the skew and the known time domain sequences.
Specifically, receiver according to the synchronizing signal after skew and the transmitting terminal for locally prestoring send with known time domain
The synchronizing signal of sequence, carries out correlation computations, obtains correlation, and the correlation is retrieved as into the 3rd offset estimation value.
209th, receiver using the integer frequency bias of the second offset estimation value and the 3rd offset estimation value and as frequency deviation
Estimate.
Specifically, receiver obtains the integer frequency bias of the second offset estimation value, and by the integer frequency bias and the 3rd frequency deviation
Estimate is added, the offset estimation value after being added.Now, virtual value of the receiver according to the second offset estimation value for obtaining
Delay registration module in digital servo-control filtering loop is updated so that the receiver is jumped by the acquisition phase of offset estimation
The slow tracking phase of offset estimation is gone to, the corresponding synchronizing signal of offset estimation value after will add up filters ring by digital servo-control
Road removal garbage signal, the synchronizing signal stablized, now, the mode selection parameter in control parameter is 0, the receiver root
The offset estimation value after the addition is exported according to the corresponding outgoing route of the mode selection parameter, and by the offset estimation after being added
Value is used as offset estimation value.
It should be noted that mode selection parameter of the receiver in control parameter offset estimation value is carried out respectively it is right
Should export, referring to process in step 201~209, so as to the offset estimation value for obtaining being exported according to each frequency deviation estimating method.
In order to better illustrate implementation process of the invention, Fig. 4 is a kind of offset estimation side provided in an embodiment of the present invention
Method flow chart.Referring to Fig. 4, when the process by step 201, i.e., offset estimation is carried out by synchronizing signal and known time domain sequences
When obtaining the first offset estimation value, now acquisition phase of the receiver according to residing for offset estimation obtains digital servo-control filtering loop
The control parameter such as parameter and mode selection parameter, the synchronizing signal that receiver is received is filtered by digital servo-control filtering loop,
And by the first offset estimation value of the synchronizing signal in mode selection parameter be 0 corresponding outgoing route output, receiver according to
After the first offset estimation value determines the temporal information of frame header position of synchronizing signal, carry out the frequency deviation based on time synchronized and estimate
Meter, obtains the second offset estimation value, and the synchronizing signal is filtered using infinite impulse response digital filter, and in mould
Formula selection parameter sends the second offset estimation value for 1 corresponding outgoing route, and now receiver judges second offset estimation
Whether value is virtual value, and when the second offset estimation value is virtual value, receiver proceeds based on known time domain sequences
Offset estimation, obtains the 3rd offset estimation value, and estimated for 0 corresponding outgoing route exports the 3rd frequency deviation by mode selection parameter
Evaluation.And when the second offset estimation value is not virtual value, it is same that the second offset estimation value is delayed to next frame by receiver
The step signal time of reception, by current synchronizing signal and next frame synchronizing signal, and using the second frequency of current frame synchronizing signal
Second offset estimation value of inclined estimate and next frame synchronizing signal, carries out the plus-minus shown in Fig. 4 and calculates, and further obtains next
Second offset estimation value of frame synchronizing signal, and judge whether the second offset estimation value of next frame synchronizing signal is effective
Value, is calculated the virtual value until finally getting the second offset estimation value according to this.
Method provided in an embodiment of the present invention, offset estimation is carried out by synchronizing signal and known time domain sequences, obtains
One offset estimation value, so as to parse the frame header position of the synchronizing signal according to the first offset estimation value, and according to the frame head
The temporal information of position, further carries out smart offset estimation, obtains the second offset estimation value, when signal to noise ratio is relatively low in communication system
When, synchronizing signal can be obtained from the relatively low communication system of signal to noise ratio using the frequency deviation estimating method, and offset estimation is carried out,
Offset estimation value is obtained, so that transmitting terminal and receiving terminal can reach the synchronous purpose of signal frequency so that receiving terminal pair
The signal for receiving can be demodulated normally, enhance the performance of communication system.Further, by the effective of the second offset estimation
Value is adjusted to the 3rd offset estimation value so that the offset estimation value can be in target zone in a short period of time,
The time of wait is reduced, and the method for estimating to be combined using time domain sequences and timing frequency deviation, ensure that very
Under low signal to noise ratio environment, the offset estimation value in target zone can be quickly obtained, and ensure to be remained in communication system
Frequency deviation within 1ppm.
Fig. 5 is a kind of frequency deviation estimation device structural representation provided in an embodiment of the present invention.Referring to Fig. 5, the device includes：
First offset estimation value acquisition module 501, temporal information acquisition module 502, phase difference acquisition module 503, the second offset estimation
Value module 504, judge module 505, offset estimation value acquisition module 506.Wherein, the first offset estimation value acquisition module 501, uses
According to the synchronizing signal and known time domain sequences for receiving, offset estimation is carried out, obtain the first offset estimation value；First frequency deviation
Estimate acquisition module 501 is connected with temporal information acquisition module 502, temporal information acquisition module 502, for according to this
One offset estimation value, determines the temporal information of the synchronizing signal, and the temporal information at least includes the synchronizing signal in receiving terminal
The reception time；Temporal information acquisition module 502 is connected with phase difference acquisition module 503, phase difference acquisition module 503, is used for
According to the phase information of the temporal information, the phase information of known time domain sequences and the synchronizing signal, known time domain sequences are obtained
With the phase difference between the synchronizing signal；Phase difference acquisition module 503 is connected with the second offset estimation value module 504, and second
Offset estimation value module 504, for according to the phase difference for obtaining, obtaining the second offset estimation value；Second offset estimation value module
504 are connected with judge module 505, judge module 505, for judging whether the second offset estimation value is virtual value；Judge
Module 505 is connected with offset estimation value acquisition module 506, offset estimation value acquisition module 506, for estimating when second frequency deviation
When evaluation is not virtual value, the first offset estimation value is retrieved as offset estimation value；The offset estimation value acquisition module 506 is also
For when the second offset estimation value is virtual value, according to the second offset estimation value, offset estimation value is obtained.
Preferably, the offset estimation value acquisition module 506 be additionally operable to according to the integer frequency bias of the second offset estimation value with
Outer part carries out frequency shift (FS) to the synchronizing signal, the synchronizing signal after being offset；According to the synchronizing signal after the skew
With the known time domain sequences, the 3rd offset estimation value is obtained；By the integer frequency bias of the second offset estimation value and the 3rd frequency deviation
Estimate and as offset estimation value.
Preferably, the judge module 505 is additionally operable to when the second offset estimation value of current frame synchronizing signal is same with former frame
When the difference for walking the offset estimation value of signal is less than predetermined threshold value, the second offset estimation value for determining the present frame synchronizing signal is
Virtual value；When the present frame synchronizing signal the second offset estimation value and the offset estimation value of previous frame synchronizing signal difference not
During less than the predetermined threshold value, the second offset estimation value for determining the present frame synchronizing signal is not virtual value.
Preferably, the device also includes：
Postponement module, for for n-th frame synchronizing signal, when the second offset estimation value is not virtual value, by this n-th
Second offset estimation value of frame synchronizing signal is postponed so that the second offset estimation value of the n-th frame synchronizing signal is deferred to
The output stage of the second offset estimation value of the (n+1)th frame synchronizing signal；
The judge module 505 is additionally operable to when the second offset estimation value of (n+1)th frame synchronizing signal is obtained, according to this
Second offset estimation value of n frame synchronizing signals and the second offset estimation value of the (n+1)th frame synchronizing signal, judge that (n+1)th frame is same
Whether the second offset estimation value for walking signal is virtual value.
Preferably, the judge module 505 be additionally operable to by the second offset estimation value of (n+1)th frame synchronizing signal and this n-th
Second offset estimation value of frame synchronizing signal is subtracted each other, and obtains the offset estimation difference of the (n+1)th frame synchronizing signal；According to this (n+1)th
The offset estimation difference of frame synchronizing signal, is adjusted to (n+1)th frame synchronizing signal, and (n+1)th frame after being adjusted is same
Step signal；The (n+1)th frame synchronizing signal after this is adjusted is filtered adjustment, obtains filtered (n+1)th frame synchronizing signal；Root
According to filtered (n+1)th frame synchronizing signal and (n+1)th frame synchronizing signal, carry out offset estimation, obtain this filtered n-th
The offset estimation value of+1 frame synchronizing signal；By the offset estimation value of filtered (n+1)th frame synchronizing signal and the n-th frame synchronization
The second offset estimation value that the is offset estimation value of signal and being retrieved as (n+1)th frame synchronizing signal；Judge (n+1)th frame synchronization
Whether the second offset estimation value of signal is virtual value.
In sum, device provided in an embodiment of the present invention, carries out frequency deviation and estimates by synchronizing signal and known time domain sequences
Meter, obtains the first offset estimation value, so as to parse the frame header position of the synchronizing signal, and root according to the first offset estimation value
According to the temporal information of the frame header position, smart offset estimation is further carried out, obtain the second offset estimation value, when letter in communication system
Make an uproar than it is relatively low when, synchronizing signal can be obtained from the relatively low communication system of signal to noise ratio using the frequency deviation estimating method, and carry out
Offset estimation, obtains offset estimation value, so that transmitting terminal and receiving terminal can reach the synchronous purpose of signal frequency so that
Receiving terminal can be demodulated normally to the signal for receiving, and enhance the performance of communication system.
It should be noted that：Above-described embodiment provide frequency deviation estimation device in offset estimation, only with above-mentioned each function
The division of module is carried out for example, in practical application, as needed can distribute by different function moulds above-mentioned functions
Block is completed, will the internal structure of receiver be divided into different functional modules, it is described above all or part of to complete
Function.In addition, the frequency deviation estimation device that above-described embodiment is provided belongs to same design with frequency deviation estimating method embodiment, its is specific
Implementation process refers to embodiment of the method, repeats no more here.
Fig. 6 is a kind of receiver structure schematic diagram provided in an embodiment of the present invention.Referring to Fig. 6, the receiver includes：Treatment
Device 601, memory 602, the processor 601 are connected with the memory 602,
The processor 601, for according to the synchronizing signal and known time domain sequences for receiving, carrying out offset estimation, obtains
First offset estimation value；
The processor 601 is additionally operable to, according to the first offset estimation value, determine the temporal information of the synchronizing signal, the time
Information at least includes reception time of the synchronizing signal in receiving terminal；
The processor 601 is additionally operable to according to the temporal information, the phase information of known time domain sequences and the synchronizing signal
Phase information, obtains known phase difference between time domain sequences and the synchronizing signal；
The processor 601 is additionally operable to, according to the phase difference for obtaining, obtain the second offset estimation value；
The processor 601 is additionally operable to judge whether the second offset estimation value is virtual value；
The processor 601 is additionally operable to, when the second offset estimation value is not virtual value, the first offset estimation value be obtained
It is taken as offset estimation value；
The processor 601 is additionally operable to, when the second offset estimation value is virtual value, according to the second offset estimation value, obtain
Take offset estimation value.
Preferably, the processor 601 is additionally operable to part beyond the integer frequency bias according to the second offset estimation value to this
Synchronizing signal carries out frequency shift (FS), the synchronizing signal after being offset；According to the synchronizing signal after the skew and the known time domain
Sequence, obtains the 3rd offset estimation value；By the integer frequency bias of the second offset estimation value and the 3rd offset estimation value and make
It is offset estimation value.
Preferably, the processor 601 is additionally operable to the second offset estimation value and previous frame synchronization when current frame synchronizing signal
When the difference of the offset estimation value of signal is less than predetermined threshold value, determine the second offset estimation value of the present frame synchronizing signal to have
Valid value；When the second offset estimation value of the present frame synchronizing signal is not small with the difference of the offset estimation value of previous frame synchronizing signal
When the predetermined threshold value, the second offset estimation value for determining the present frame synchronizing signal is not virtual value.
Preferably, the processor 601 is additionally operable to for n-th frame synchronizing signal, when the second offset estimation value is not effective
During value, the second offset estimation value of the n-th frame synchronizing signal is postponed so that the second frequency deviation of the n-th frame synchronizing signal
Estimate is deferred to the output stage of the second offset estimation value of the (n+1)th frame synchronizing signal；When obtaining (n+1)th frame synchronizing signal
The second offset estimation value when, second of the second offset estimation value and the (n+1)th frame synchronizing signal according to the n-th frame synchronizing signal
Offset estimation value, whether the second offset estimation value for judging (n+1)th frame synchronizing signal is virtual value.
Preferably, the processor 601 is additionally operable to the second offset estimation value of (n+1)th frame synchronizing signal and the n-th frame
Second offset estimation value of synchronizing signal is subtracted each other, and obtains the offset estimation difference of the (n+1)th frame synchronizing signal；According to (n+1)th frame
The offset estimation difference of synchronizing signal, is adjusted to (n+1)th frame synchronizing signal, (n+1)th frame synchronization after being adjusted
Signal；The (n+1)th frame synchronizing signal after this is adjusted is filtered adjustment, obtains filtered (n+1)th frame synchronizing signal；According to
Filtered (n+1)th frame synchronizing signal and (n+1)th frame synchronizing signal, carry out offset estimation, obtain this filtered (n+1)th
The offset estimation value of frame synchronizing signal；The offset estimation value of filtered (n+1)th frame synchronizing signal and the n-th frame are synchronously believed
Number it is offset estimation value and be retrieved as the second offset estimation value of (n+1)th frame synchronizing signal；Judge that (n+1)th frame synchronization is believed
Number the second offset estimation value whether be virtual value.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can be by hardware
To complete, it is also possible to instruct the hardware of correlation to complete by program, described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (11)
1. a kind of frequency deviation estimating method, it is characterised in that methods described includes：
According to the synchronizing signal for receiving and known time domain sequences, offset estimation is carried out, obtain the first offset estimation value；
According to the first offset estimation value, the temporal information of the synchronizing signal is determined, the temporal information at least includes institute
State reception time of the synchronizing signal in receiving terminal；
According to the phase information of the temporal information, the phase information of known time domain sequences and the synchronizing signal, obtain known
Phase difference between time domain sequences and the synchronizing signal；
According to the phase difference for obtaining, the second offset estimation value is obtained；
Judge whether the second offset estimation value is virtual value；
When the second offset estimation value is not virtual value, the first offset estimation value is retrieved as offset estimation value；
When the second offset estimation value is virtual value, according to the second offset estimation value, offset estimation value is obtained.
2. method according to claim 1, it is characterised in that according to the second offset estimation value, obtains offset estimation
Value includes：
The part beyond integer frequency bias according to the second offset estimation value carries out frequency shift (FS) to the synchronizing signal, obtains
Synchronizing signal after skew；
According to the synchronizing signal after the skew and the known time domain sequences, the 3rd offset estimation value is obtained；
Using the integer frequency bias of the second offset estimation value and the 3rd offset estimation value and as offset estimation value.
3. method according to claim 1, it is characterised in that judge whether the second offset estimation value is virtual value bag
Include：
When the second offset estimation value of current frame synchronizing signal with the difference of the offset estimation value of previous frame synchronizing signal less than pre-
If during threshold value, the second offset estimation value for determining the current frame synchronizing signal is virtual value；
When the current frame synchronizing signal the second offset estimation value and the offset estimation value of previous frame synchronizing signal difference not
During less than the predetermined threshold value, the second offset estimation value for determining the current frame synchronizing signal is not virtual value.
4. method according to claim 1, it is characterised in that judge the second offset estimation value whether be virtual value it
Afterwards, methods described also includes：
For n-th frame synchronizing signal, when the second offset estimation value is not virtual value, by the n-th frame synchronizing signal
Second offset estimation value is postponed so that the second offset estimation value of the n-th frame synchronizing signal is deferred to the (n+1)th frame synchronization
The output stage of the second offset estimation value of signal；
When the second offset estimation value of (n+1)th frame synchronizing signal is obtained, the second frequency according to the n-th frame synchronizing signal
Second offset estimation value of inclined estimate and the (n+1)th frame synchronizing signal, judges that the second frequency deviation of (n+1)th frame synchronizing signal is estimated
Whether evaluation is virtual value.
5. method according to claim 4, it is characterised in that according to the second offset estimation of the n-th frame synchronizing signal
Second offset estimation value of value and the (n+1)th frame synchronizing signal, judging the second offset estimation value of (n+1)th frame synchronizing signal is
It is no for virtual value includes：
By the second offset estimation value of the second offset estimation value of (n+1)th frame synchronizing signal and the n-th frame synchronizing signal
Subtract each other, obtain the offset estimation difference of the (n+1)th frame synchronizing signal；
According to the offset estimation difference of (n+1)th frame synchronizing signal, (n+1)th frame synchronizing signal is adjusted, obtained
(n+1)th frame synchronizing signal after adjustment；
The (n+1)th frame synchronizing signal after the adjustment is filtered adjustment, filtered (n+1)th frame synchronizing signal is obtained；
According to filtered (n+1)th frame synchronizing signal and (n+1)th frame synchronizing signal, offset estimation is carried out, obtain institute
State the offset estimation value of filtered (n+1)th frame synchronizing signal；
By the offset estimation value of filtered (n+1)th frame synchronizing signal and the offset estimation value of the n-th frame synchronizing signal
And be retrieved as the second offset estimation value of (n+1)th frame synchronizing signal；
Whether the second offset estimation value for judging (n+1)th frame synchronizing signal is virtual value.
6. a kind of frequency deviation estimation device, it is characterised in that described device includes：
First offset estimation value acquisition module, for according to the synchronizing signal and known time domain sequences for receiving, carrying out frequency deviation and estimating
Meter, obtains the first offset estimation value；
Temporal information acquisition module, for according to the first offset estimation value, determining the temporal information of the synchronizing signal, institute
Stating temporal information at least includes reception time of the synchronizing signal in receiving terminal；
Phase difference acquisition module, for according to the temporal information, the phase information of known time domain sequences and the synchronizing signal
Phase information, obtain known phase difference between time domain sequences and the synchronizing signal；
Second offset estimation value module, for according to the phase difference for obtaining, obtaining the second offset estimation value；
Judge module, for judging whether the second offset estimation value is virtual value；
Offset estimation value acquisition module, for when the second offset estimation value is not virtual value, first frequency deviation being estimated
Evaluation is retrieved as offset estimation value；
The offset estimation value acquisition module is additionally operable to when the second offset estimation value is virtual value, according to the described second frequency
Inclined estimate, obtains offset estimation value.
7. device according to claim 6, it is characterised in that the offset estimation value acquisition module is additionally operable to according to described
Part beyond the integer frequency bias of the second offset estimation value carries out frequency shift (FS) to the synchronizing signal, the synchronization after being offset
Signal；According to the synchronizing signal after the skew and the known time domain sequences, the 3rd offset estimation value is obtained；By described second
The integer frequency bias of offset estimation value and the 3rd offset estimation value and as offset estimation value.
8. device according to claim 6, it is characterised in that the judge module is additionally operable to when current frame synchronizing signal
When second offset estimation value is less than predetermined threshold value with the difference of the offset estimation value of previous frame synchronizing signal, the present frame is determined
Second offset estimation value of synchronizing signal is virtual value；When the second offset estimation value and former frame of the current frame synchronizing signal
When the difference of the offset estimation value of synchronizing signal is not less than the predetermined threshold value, the second frequency of the current frame synchronizing signal is determined
Inclined estimate is not virtual value.
9. device according to claim 6, it is characterised in that described device also includes：
Postponement module, for for n-th frame synchronizing signal, when the second offset estimation value is not virtual value, by described n-th
Second offset estimation value of frame synchronizing signal is postponed so that the second offset estimation value of the n-th frame synchronizing signal postpones
To the output stage of the second offset estimation value of the (n+1)th frame synchronizing signal；
The judge module is additionally operable to when the second offset estimation value of (n+1)th frame synchronizing signal is obtained, according to described n-th
Second offset estimation value of frame synchronizing signal and the second offset estimation value of the (n+1)th frame synchronizing signal, judge that (n+1)th frame is same
Whether the second offset estimation value for walking signal is virtual value.
10. device according to claim 9, it is characterised in that the judge module is additionally operable to (n+1)th frame synchronization
Second offset estimation value of signal is subtracted each other with the second offset estimation value of the n-th frame synchronizing signal, obtains the (n+1)th frame synchronization letter
Number offset estimation difference；According to the offset estimation difference of (n+1)th frame synchronizing signal, to (n+1)th frame synchronizing signal
It is adjusted, (n+1)th frame synchronizing signal after being adjusted；The (n+1)th frame synchronizing signal after the adjustment is filtered
Ripple is adjusted, and obtains filtered (n+1)th frame synchronizing signal；According to filtered (n+1)th frame synchronizing signal and described (n+1)th
Frame synchronizing signal, carries out offset estimation, obtains the offset estimation value of filtered (n+1)th frame synchronizing signal；By the filter
The offset estimation value of the offset estimation value of the (n+1)th frame synchronizing signal after ripple and the n-th frame synchronizing signal and be retrieved as institute
State the second offset estimation value of the (n+1)th frame synchronizing signal；Judge (n+1)th frame synchronizing signal the second offset estimation value whether
It is virtual value.
11. a kind of receivers, it is characterised in that the receiver includes：Processor, memory, the processor are deposited with described
Reservoir is connected,
The processor, for according to the synchronizing signal and known time domain sequences for receiving, carrying out offset estimation, obtains the first frequency
Inclined estimate；
The processor is additionally operable to, according to the first offset estimation value, the temporal information of the synchronizing signal be determined, when described
Between information at least include the synchronizing signal receiving terminal the reception time；
The processor is additionally operable to the phase according to the temporal information, the phase information of known time domain sequences and the synchronizing signal
Position information, obtains known phase difference between time domain sequences and the synchronizing signal；
The processor is additionally operable to, according to the phase difference for obtaining, obtain the second offset estimation value；
The processor is additionally operable to judge whether the second offset estimation value is virtual value；
The processor is additionally operable to, when the second offset estimation value is not virtual value, the first offset estimation value be obtained
It is offset estimation value；
The processor is additionally operable to, when the second offset estimation value is virtual value, according to the second offset estimation value, obtain
Take offset estimation value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410088706.8A CN103873415B (en) | 2014-03-11 | 2014-03-11 | Frequency deviation estimating method, device and receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410088706.8A CN103873415B (en) | 2014-03-11 | 2014-03-11 | Frequency deviation estimating method, device and receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103873415A CN103873415A (en) | 2014-06-18 |
| CN103873415B true CN103873415B (en) | 2017-07-07 |
Family
ID=50911548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410088706.8A Active CN103873415B (en) | 2014-03-11 | 2014-03-11 | Frequency deviation estimating method, device and receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103873415B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106464644B (en) * | 2016-03-07 | 2019-11-19 | 香港应用科技研究院有限公司 | In communication system between transmitter and receiver Frequency Synchronization system and method |
| US9912512B2 (en) | 2016-03-07 | 2018-03-06 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Systems and methods for frequency synchronization between transmitters and receivers in a communication system |
| US9912511B2 (en) | 2016-03-07 | 2018-03-06 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Systems and methods for time synchronization between transmitters and receivers in a communication system |
| CN107872868B (en) * | 2016-09-26 | 2020-04-03 | 华为技术有限公司 | Method, device and system for signal processing |
| CN112217757B (en) * | 2020-09-30 | 2023-06-27 | 北京升哲科技有限公司 | Self-adaptive frequency offset tracking device and receiver |
| CN113315728B (en) * | 2021-04-21 | 2022-09-23 | 展讯通信（上海）有限公司 | Frequency offset estimation method, terminal equipment, medium and chip system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101047680A (en) * | 2006-03-29 | 2007-10-03 | 上海原动力通信科技有限公司 | Frequency offset estimation method in orthogonal frequency division multiplex OFDM system |
| WO2007117525A2 (en) * | 2006-04-03 | 2007-10-18 | Wionics Research | Frequency offset correction for an ultrawideband communication system |
| CN102480443A (en) * | 2010-11-26 | 2012-05-30 | 普天信息技术研究院有限公司 | Carrier frequency offset estimation method and device for mobile communication system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001086904A1 (en) * | 2000-05-05 | 2001-11-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus to estimate frequency offset in a receiver |
-
2014
- 2014-03-11 CN CN201410088706.8A patent/CN103873415B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101047680A (en) * | 2006-03-29 | 2007-10-03 | 上海原动力通信科技有限公司 | Frequency offset estimation method in orthogonal frequency division multiplex OFDM system |
| WO2007117525A2 (en) * | 2006-04-03 | 2007-10-18 | Wionics Research | Frequency offset correction for an ultrawideband communication system |
| CN102480443A (en) * | 2010-11-26 | 2012-05-30 | 普天信息技术研究院有限公司 | Carrier frequency offset estimation method and device for mobile communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103873415A (en) | 2014-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103873415B (en) | Frequency deviation estimating method, device and receiver | |
| KR102062221B1 (en) | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses | |
| EP0730357B1 (en) | Frequency and frame synchronisation for OFDM | |
| CN105830375B (en) | Long Term Evolution frame synchronization detection method and device, the relay using it | |
| JP5453704B2 (en) | Physical layer preamble format for wireless communication systems | |
| KR100996764B1 (en) | Frequency tracking which adapts to timing synchronization | |
| CN102130883A (en) | Time frequency synchronization method for time division long-term evolution (TD-LTE) system | |
| CN101534280B (en) | Timing synchronous receiving method and device thereof | |
| KR20110099050A (en) | Methods and systems for timing acquisition robust to channel fading | |
| EP1441463A1 (en) | A method and device for carrier frequency synchronization | |
| CN102340796B (en) | Secondary synchronization channel detection method and device | |
| CN105991502A (en) | Method and device for receiving preambles | |
| CN107070833B (en) | Detection method and synchronization method for synchronization signal with symmetry and terminal | |
| CN106230758B (en) | A kind of lte-a system integer frequency offset estimation method | |
| CN108429712A (en) | OFDM-based wireless communication time-frequency synchronization method | |
| JPH11308187A (en) | Method and system for recovering joining timing to dmt modem and for evaluating channel | |
| TWI256790B (en) | Process of synchronization in the time and frequency domain of multiple modems in a transmission system with OFDM modulation | |
| CN107911328B (en) | Frame synchronization judging device and judging method | |
| CN101141135B (en) | Method to eliminate inter-subcarrier interference caused by phase noise in OFDM receiver | |
| CN108736931A (en) | A kind of signal synchronizing method and device | |
| CN106342412B (en) | A kind of frequency domain synchronizing signal of ofdm system sends and detection method | |
| CN103959693B (en) | Receive apparatus and method | |
| KR19980035453A (en) | Carrier Frequency Synchronizer of OFDM System | |
| CN104283628B (en) | A kind of method of cell searching in communication system | |
| CN103368881B (en) | Signal of communication frequency deviation adjusts system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |