CN102571647A - Frequency offset estimation method and device - Google Patents
Frequency offset estimation method and device Download PDFInfo
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- CN102571647A CN102571647A CN2010106081589A CN201010608158A CN102571647A CN 102571647 A CN102571647 A CN 102571647A CN 2010106081589 A CN2010106081589 A CN 2010106081589A CN 201010608158 A CN201010608158 A CN 201010608158A CN 102571647 A CN102571647 A CN 102571647A
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Abstract
The invention discloses a frequency offset estimation method and device, which are used for estimating a larger frequency offset. The frequency offset estimation method comprises the steps of: calculating a single-pilot frequency offset estimation value on the basis of two pilot frequency sequences included in the received current subframe, determining a preset frequency offset initial value corresponding to the single-pilot frequency offset estimation value, calculating dual-pilot frequency offset estimation values on the basis of the two pilot frequency sequences included in the received current subframe, and calculating a frequency offset estimation value of the current subframe on the basis of the frequency offset initial value and the dual-pilot frequency offset estimation values. Therefore, the large frequency offset can be estimated, the realization complexity is reduced while the frequency offset estimation accuracy is ensured, and the cost is saved. The invention also discloses a frequency offset estimation device.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of frequency deviation estimating method and device.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing; OFDM) a kind of mutually orthogonal multi-carrier transmission technology of subcarrier that the requires time, a plurality of subcarriers that its transmission bandwidth with a broad is divided into mutually orthogonal are used for the parallel transmission data.OFDM have the decline of availability of frequency spectrum height, anti-multipath, multiple-input, multiple-output (Multiple Input Multiple Output, MIMO), advantage such as technology is simple.But,, therefore very responsive to frequency shift (FS) because OFDM requires subcarrier mutually orthogonal.For example, synchronous error appears in frequency between the transmitter and receiver, and perhaps the Doppler effect (Doppler) that in the high-speed mobile process, produces of travelling carriage all possibly cause carrier frequency shift (hereinafter to be referred as frequency deviation).The frequency deviation problem has become one of key problem of OFDM technology.
Existing method mainly is to be used for the less situation of frequency deviation, and when frequency deviation was big, the precision of estimation was relatively low.In the prior art, can adopt repeatedly the method for frequency offset estimating and compensation to realize estimation,, increase complexity simultaneously and realize cost though can improve the precision of frequency offset estimating to a certain extent to big frequency deviation.
Summary of the invention
The present invention provides a kind of frequency deviation estimating method and device, can estimate big frequency deviation, in the accuracy that guarantees frequency offset estimating, has reduced the complexity that realizes, has practiced thrift cost.
The concrete technical scheme that the embodiment of the invention provides is following:
A kind of frequency deviation estimating method comprises:
Two pilot frequency sequences that comprise based on the current subframe that receives calculate single pilot tone frequency deviation estimated value;
Confirm the preset frequency deviation initial value of corresponding said single pilot tone frequency deviation estimated value;
Two pilot frequency sequences that comprise based on the current subframe that receives calculate double pilot frequency offset estimating value;
Based on said frequency deviation initial value and said double pilot frequency offset estimating value, calculate the frequency offset estimating value of said present frame.
A kind of frequency deviation estimation device comprises:
First processing unit is used for calculating single pilot tone frequency deviation estimated value based on two pilot frequency sequences that the current subframe that receives comprises;
Second processing unit is used for confirming the preset frequency deviation initial value of corresponding said single pilot tone frequency deviation estimated value;
The 3rd processing unit is used for calculating double pilot frequency offset estimating value based on two pilot frequency sequences that the current subframe that receives comprises;
Manages the unit everywhere, is used for based on said frequency deviation initial value and said double pilot frequency offset estimating value, calculates the frequency offset estimating value of said current subframe.
Based on technique scheme; In the embodiment of the invention; Two pilot frequency sequences that at first comprise based on the current subframe that receives calculate single pilot tone frequency deviation estimated value, confirm the frequency deviation initial value that corresponding single pilot tone frequency deviation estimated value is preset, and two pilot frequency sequences that comprise based on the current subframe that receives then calculate double pilot frequency offset estimating value; Calculate the frequency offset estimating value of current subframe based on frequency deviation initial value and double pilot frequency offset estimating value; Thereby with single pilot tone frequency offset estimating and double pilot frequency offset estimating realization combining frequency offset estimating, thereby realize estimation effectively, when guaranteeing the frequency offset estimating accuracy to big frequency deviation to current subframe; Reduce the complexity that realizes, practiced thrift cost.
Description of drawings
Fig. 1 is an embodiment of the invention frequency deviation estimation device structure chart;
Fig. 2 is the detail flowchart of embodiment of the invention frequency deviation estimating method;
Fig. 3 is the position view of embodiment of the invention pilot tone in subframe.
Embodiment
In order to realize estimation, and when guaranteeing the frequency offset estimating accuracy, reduce implementation complexity to big frequency deviation; Practice thrift cost; The invention provides a kind of frequency deviation estimating method and device, can estimate big frequency deviation, when guaranteeing the frequency offset estimating accuracy; Reduce implementation complexity, practice thrift cost.This method is: two pilot frequency sequences that comprise based on the current subframe that receives calculate single pilot tone frequency deviation estimated value; Confirm should the preset frequency deviation initial value of single pilot tone frequency deviation estimated value; Two pilot frequency sequences that comprise based on the current subframe that receives calculate double pilot frequency offset estimating value; Based on above-mentioned frequency deviation initial value and above-mentioned double pilot frequency offset estimating value, calculate the frequency offset estimating value of current subframe.
Below in conjunction with accompanying drawing the preferred embodiment of the invention is elaborated.
Consult shown in the accompanying drawing 1, in the embodiment of the invention, frequency deviation estimation device mainly is made up of following processing unit:
The 3rd processing unit 103 is used for calculating double pilot frequency offset estimating value based on two pilot frequency sequences that the current subframe that receives comprises;
Manages unit 104 everywhere, is used for based on above-mentioned frequency deviation initial value and above-mentioned double pilot frequency offset estimating value, calculates the frequency offset estimating value of current subframe.
Based on the said system framework, to consult shown in the accompanying drawing 2, in the embodiment of the invention, the detailed method flow process of frequency offset estimating is following:
Step 201: two pilot frequency sequences that comprise based on the current subframe that receives calculate single pilot tone frequency deviation estimated value.
Adopt the frequency pilot sign of base station side and end side agreement, in each subframe, insert pilot tone, consult shown in the accompanying drawing 3, insert a frequency pilot sign in the centre position of each time slot of subframe.The subframe (each time slot that is subframe comprises 7 symbols) that accompanying drawing 3 is depicted as with general cyclic prefix is an example.
Wherein, when two pilot frequency sequences that comprise based on the current subframe that receives calculated single pilot tone frequency deviation estimated value, any pilot frequency sequence in two pilot frequency sequences that comprise based on the current subframe that receives calculated single pilot tone frequency deviation estimated value; Perhaps, each pilot frequency sequence in two pilot frequency sequences that comprise based on the current subframe that receives respectively calculates corresponding single pilot tone frequency deviation estimated value, gets its mean value again.
In the embodiment of the invention; When any pilot frequency sequence that comprises based on the current subframe that receives calculates corresponding single pilot tone frequency deviation estimated value; Calculate corresponding channel estimation value based on above-mentioned any pilot frequency sequence; After adopting this channel estimation value that above-mentioned any pilot frequency sequence is revised, adopt revised pilot frequency sequence to carry out time-domain related calculation again, and calculate single pilot tone frequency deviation estimated value based on the time-domain related calculation result with corresponding local pilot frequency sequence.
Preferably; When any pilot frequency sequence and local pilot frequency sequence calculate single pilot tone frequency deviation estimated value in two pilot frequency sequences that comprise based on the current subframe that receives; Partial sequence that can the above-mentioned any pilot frequency sequence of intercepting; And the sequence of corresponding position equal length in local pilot frequency sequence of intercepting and the channel estimating value sequence, the above-mentioned any pilot frequency sequence that adopts the channel estimation value of intercepting that intercepting is obtained is again revised and is carried out follow-up computing.
Preferably, when any pilot frequency sequence in two pilot frequency sequences that the current subframe that intercepting receives comprises, local pilot frequency sequence and channel estimating value sequence, the minimum approximate number of intercepted length has only 2,3 or 5, the best be 2 index doubly.In the embodiment of the invention, the sequence of intercepting equal length respectively from the two ends of pilot frequency sequence is reconstructed into the sequence of 2 index double-length degree, to carry out frequency offset estimating.
Wherein, Adopt after any pilot frequency sequence is revised in two pilot frequency sequences that this channel estimation value comprises the current subframe that receives; Adopt revised pilot frequency sequence and local pilot frequency sequence to carry out time-domain related calculation again; Be specially: after calculating the inverse discrete Fourier transform of revised pilot frequency sequence, multiply by the conjugation of the inverse discrete Fourier transform of local pilot frequency sequence, promptly obtain both time-domain related calculation results.Concrete formulate is following:
w(k)＝IDFT(partofRxP(k)/partofH(k))×(IDFT(partofX(k)))
*
Wherein, 0≤k≤2
n-1,2
nPilot sequence length for intercepting; W (n) expression time-domain related calculation result; Any pilot frequency sequence in two pilot frequency sequences that the above-mentioned current subframe of partofRxP (k) expression intercepting comprises; The corresponding channel estimating value sequence of pilot frequency sequence of the reception of partofH (k) expression and intercepting, the local pilot frequency sequence of the corresponding intercepting of partofX (k) expression.
When calculating single pilot tone frequency deviation estimated value based on the time-domain related calculation result; Be specially: the sequence that obtains based on time-domain related calculation; Phase difference between the sub-carrier positions of pilot tone place in any pilot frequency sequence in two pilot frequency sequences that the current subframe that calculating receives comprises; And, calculate single pilot tone frequency deviation estimated value according to the subcarrier spacing of this phase difference and prevision.In the embodiment of the invention; When calculating the phase difference between the sub-carrier positions of pilot tone place; Can calculate the mean value of time domain correlated series first half and the mean value of latter half respectively, further calculate the phase difference between this two parts place, pilot tone front and back sub-carrier positions again.Concrete computing formula is following:
Preferably, can adopt single pilot tone frequency deviation estimated value of former frame that single pilot tone frequency deviation estimated value of present frame is carried out filtering, concrete formula is:
P wherein
1Be filtering factor, and satisfy 0≤p
1≤1,
Frequency offset estimating value for last subframe.
Step 202: confirm the preset frequency deviation initial value of corresponding above-mentioned single pilot tone frequency deviation estimated value.
Be specially: in each preset scope, select and the corresponding scope of single pilot tone frequency deviation estimated value, again based on confirming the frequency deviation initial value with the corresponding scope of single pilot tone frequency deviation estimated value.
In the embodiment of the invention; According to the maximum frequency deviation value that possibly occur; Set different scopes; Confirm the scope that above-mentioned single pilot tone frequency deviation estimated value is affiliated; And selection related offset initial value; The value range of selection of initial value and double pilot frequency offset estimating is related, and promptly
or
and T are the maximum magnitude value of double pilot frequency offset estimating, and n is an integer.For example; Suppose that the double pilot frequency offset estimation range is-1000～1000 hertz; Set different scopes according to the maximum frequency deviation value that possibly occur; Be respectively-1000～1000 hertz, 1000～2000 hertz ,-2000～-1000 hertz, 2000～3000 hertz, less than-3000～-2000 hertz, belong to-1000～1000 hertz if judge single pilot tone frequency deviation estimated value, then with zero as the frequency deviation initial value; And for example the fruit judge that single pilot tone frequency deviation estimated value belongs to 1000～2000 hertz, then with 1000 as the frequency deviation initial value; And for example fruit judges that single pilot tone frequency deviation estimated value belongs to-2000～-1000 hertz, then-1000 hertz as the frequency deviation initial value; And for example the fruit judge that single pilot tone frequency deviation estimated value is in 2000～3000 hertz, then with 2000 hertz as the frequency deviation initial value; And for example fruit judges that single pilot tone frequency deviation estimated value is in-3000～-2000 hertz, then-2000 hertz as the frequency deviation initial value.
Step 203: two pilot frequency sequences that comprise based on the current subframe that receives calculate double pilot frequency offset estimating value.
In the embodiment of the invention, two pilot frequency sequences that comprise based on the current subframe that receives calculate the phase difference of two pilot frequency locations, and in frequency deviation initial value restricted portion, according to the phase difference calculating double pilot frequency offset estimating value of above-mentioned two pilot frequency locations.Concrete computing formula is:
Step 204:, calculate the frequency offset estimating value of current subframe based on above-mentioned frequency deviation initial value and above-mentioned double pilot frequency offset estimating value.
With above-mentioned frequency deviation initial value and above-mentioned double pilot frequency offset estimating value with, as the frequency offset estimating value of current subframe, concrete formula is:
Wherein Δ f ' is the frequency offset estimating value of current subframe, Δ Δ f
2Be double pilot frequency offset estimating value,
Be the frequency deviation initial value.
Preferably, adopt the frequency offset estimating value of last subframe that the frequency offset estimating value of above-mentioned current subframe is carried out filtering, concrete formula is:
Wherein,
For the frequency deviation assessed value of current subframe is carried out filtered frequency offset estimating value, p
2The expression filtering factor, and satisfy 0≤p
2≤1,
The frequency offset estimating value of representing last subframe, the frequency offset estimating value of the current subframe of Δ f ' expression.
At last, adopt filtered frequency offset estimating value that current subframe is carried out frequency compensation.
Based on technique scheme; In the embodiment of the invention; Two pilot frequency sequences that at first comprise based on the current subframe that receives calculate single pilot tone frequency deviation estimated value, confirm the frequency deviation initial value that corresponding single pilot tone frequency deviation estimated value is preset, then in according to frequency deviation initial value restricted portion; Two pilot frequency sequences that comprise based on the current subframe that receives calculate double pilot frequency offset estimating value; Calculate the frequency offset estimating value of current subframe based on frequency deviation initial value and double pilot frequency offset estimating value, thus with single pilot tone frequency offset estimating and double pilot frequency offset estimating realization combining to the estimation of frequency deviation by a relatively large margin of current subframe, thereby when guaranteeing the frequency offset estimating accuracy; Reduce the complexity that realizes, practiced thrift cost.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. a frequency deviation estimating method is characterized in that, comprising:
Two pilot frequency sequences that comprise based on the current subframe that receives calculate single pilot tone frequency deviation estimated value;
Confirm the preset frequency deviation initial value of corresponding said single pilot tone frequency deviation estimated value;
Two pilot frequency sequences that comprise based on the current subframe that receives calculate double pilot frequency offset estimating value;
Based on said frequency deviation initial value and said double pilot frequency offset estimating value, calculate the frequency offset estimating value of said current subframe.
2. the method for claim 1 is characterized in that, two pilot frequency sequences that comprise based on the current subframe that receives calculate single pilot tone frequency deviation estimated value, comprising:
Any pilot frequency sequence in two pilot frequency sequences that comprise based on the current subframe that receives calculates single pilot tone frequency deviation estimated value;
Perhaps,
Each pilot frequency sequence in two pilot frequency sequences that comprise based on the current subframe that receives respectively calculates corresponding single pilot tone frequency deviation estimated value, gets its mean value again.
3. method as claimed in claim 2 is characterized in that, when calculating corresponding single pilot tone frequency deviation estimated value based on any pilot frequency sequence, comprising:
Calculate corresponding channel estimation value based on said any pilot frequency sequence;
After adopting said channel estimation value that the said any pilot frequency sequence that receives is revised, adopt revised pilot frequency sequence to carry out time-domain related calculation, and calculate single pilot tone frequency deviation estimated value based on the time-domain related calculation result with corresponding local pilot frequency sequence.
4. like claim 1,2 or 3 described methods, it is characterized in that, confirm the preset frequency deviation initial value of corresponding said single pilot tone frequency deviation estimated value, comprising:
In each preset scope, select and the corresponding scope of said single pilot tone frequency deviation estimated value;
Based on confirming the frequency deviation initial value with the corresponding scope of said single pilot tone frequency deviation estimated value.
5. method as claimed in claim 4 is characterized in that, two pilot frequency sequences that comprise based on the current subframe that receives calculate double pilot frequency offset estimating value, comprising:
Two pilot frequency sequences that comprise based on the current subframe that receives calculate the phase difference of adjacent pilot frequencies position;
In said frequency deviation initial value restricted portion, according to the phase difference calculating double pilot frequency offset estimating value of said adjacent pilot frequencies position.
6. method as claimed in claim 5 is characterized in that, based on said frequency deviation initial value and said double pilot frequency offset estimating value, calculates the frequency offset estimating value of said current subframe, comprising:
Calculate said frequency deviation initial value and said double pilot frequency deviation initial value with, with the frequency offset estimating value of result of calculation as said current subframe.
7. a frequency deviation estimation device is characterized in that, comprising:
First processing unit is used for calculating single pilot tone frequency deviation estimated value based on two pilot frequency sequences that the current subframe that receives comprises;
Second processing unit is used for confirming the preset frequency deviation initial value of corresponding said single pilot tone frequency deviation estimated value;
The 3rd processing unit is used for calculating double pilot frequency offset estimating value based on two pilot frequency sequences that the current subframe that receives comprises;
Manages the unit everywhere, is used for based on said frequency deviation initial value and said double pilot frequency offset estimating value, calculates the frequency offset estimating value of said current subframe.
8. like the said device of claim 7; It is characterized in that; When two pilot frequency sequences that said first processing unit comprises based on the current subframe that receives calculated single pilot tone frequency deviation estimated value, any pilot frequency sequence in two pilot frequency sequences that comprise based on the current subframe that receives calculated single pilot tone frequency deviation estimated value;
Perhaps,
Each pilot frequency sequence in two pilot frequency sequences that comprise based on the current subframe that receives respectively calculates corresponding single pilot tone frequency deviation estimated value, gets its mean value again.
9. device as claimed in claim 8 is characterized in that, said first processing unit calculates corresponding single pilot tone frequency deviation estimated value based on any pilot frequency sequence, is specially:
Calculate corresponding channel estimation value based on said any pilot frequency sequence;
After adopting said channel estimation value that the said any pilot frequency sequence that receives is revised, adopt revised pilot frequency sequence to carry out time-domain related calculation, and calculate single pilot tone frequency deviation estimated value based on the time-domain related calculation result with corresponding local pilot frequency sequence.
10. like claim 7,8 or 9 described devices; It is characterized in that; When said second processing unit is confirmed the preset frequency deviation initial value of corresponding said single pilot tone frequency deviation estimated value; In each preset scope, select and the corresponding scope of said single pilot tone frequency deviation estimated value, based on confirming the frequency deviation initial value with the corresponding scope of said single pilot tone frequency deviation estimated value.
11. device as claimed in claim 10 is characterized in that, two pilot frequency sequences that said the 3rd processing unit comprises based on the current subframe that receives calculate double pilot frequency offset estimating value, are specially:
Two pilot frequency sequences that comprise based on the current subframe that receives calculate the phase difference of adjacent pilot frequencies position;
In said frequency deviation initial value restricted portion, according to the phase difference calculating double pilot frequency offset estimating value of said adjacent pilot frequencies position.
12. device as claimed in claim 11 is characterized in that, said manages the unit everywhere based on said frequency deviation initial value and said double pilot frequency offset estimating value, calculates the frequency offset estimating value of said current subframe, is specially:
Calculate said frequency deviation initial value and said double pilot frequency deviation initial value with, with the frequency offset estimating value of result of calculation as said current subframe.
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| CN107135182A (en) * | 2017-04-10 | 2017-09-05 | 上海顺久电子科技有限公司 | The frequency offset calculation method and device of FM signal |
| CN110191074A (en) * | 2018-02-23 | 2019-08-30 | 中兴通讯股份有限公司 | A kind of method and device of data demodulation |
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| CN117527497A (en) * | 2024-01-05 | 2024-02-06 | 中国电力科学研究院有限公司 | Frequency offset calibration method, device, electronic equipment and storage medium |
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