CN104580049A - An uplink frequency offset compensating method - Google Patents
An uplink frequency offset compensating method Download PDFInfo
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- CN104580049A CN104580049A CN201310472816.XA CN201310472816A CN104580049A CN 104580049 A CN104580049 A CN 104580049A CN 201310472816 A CN201310472816 A CN 201310472816A CN 104580049 A CN104580049 A CN 104580049A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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Abstract
The present application discloses an uplink frequency offset compensating method, which includes: A, performing a phase difference estimation according to a cyclic prefix CP of a received uplink subframe and a data portion corresponding to the CP, and storing a symbol of the phase difference estimation; B, performing a phase difference estimation using a pilot frequency of one uplink subframe, to obtain an estimated phase difference ; C, if the symbol of the phase difference estimated by using the pilot frequency is consistent with the stored symbol of the phase difference estimation, keeping a value of the phase difference unchanged; if the stored symbol of the phase difference estimation is positive, while the value of is negative, adding 2pai to to be as an amended phase difference of the frequency offset estimation; and if the stored symbol of the phase difference estimation is negative, while the value of is positive, subtracting 2pai from the value of to be as an amended phase difference value; and D, according to the amended phase difference , performing a phase compensation on uplink data. The technical solution of the present application can preferably solve the problem of bad data receptivity when the uplink frequency offset is large, and increase the reception efficiency of the uplink data.
Description
Technical field
The application relates to mobile communication technology field, particularly relates to a kind of method that uplink frequency offset compensates.
Background technology
In mobile communication system, the high-speed motion of subscriber equipment can cause Doppler frequency shift, if such as subscriber equipment is with the speeds of 300km/h, carrier frequency is 2.6GHz, then the maximum doppler frequency produced is about 722Hz.In the uplink, the Doppler shift that the motion of subscriber equipment brings can be at most the maximum doppler frequency of twice, and that is, subscriber equipment is with the speeds of 300km/h, under not considering the condition of down-going synchronous error, uplink frequency offset can reach 1444Hz at most.Under this Frequency Offset, if do not taken some measures, upstream data cannot correctly receive.
In existing frequency excursion algorithm, some employing pilot tones carry out frequency deviation estimation.Such as, utilize the phase difference of two row pilot tones in Physical Uplink Shared Channel (PUSCH) subframe to carry out frequency deviation estimation in LTE, the maximum frequency deviation that this method can be estimated is at about 1071Hz, if uplink frequency offset has exceeded this scope, can not receiving of upward signal will be caused.And under the high-speed case such as high ferro, the speed of subscriber equipment likely can meet or exceed 300km/h, if carrier frequency is 2.6GHz, consider that the error of down-going synchronous is 0.01ppm, up frequency deviation will reach 1444+260=1704Hz, exceeded the maximum frequency deviation scope utilizing pilot tone to estimate, at this moment data cannot receive.
Summary of the invention
This application provides a kind of method that uplink frequency offset compensates, can solve preferably uplink frequency offset larger time data receiver poor-performing problem, improve the receiving efficiency of upstream data.
The method that a kind of uplink frequency offset that the embodiment of the present application provides compensates, comprising:
A, assign to carry out phase difference estimation according to the cyclic prefix CP of sub-frame of uplink received and data portion corresponding to CP, and preserve the symbol of phase difference estimation;
B, utilize the pilot tone in a sub-frame of uplink to carry out phase difference estimation, obtain the phase difference estimated;
If the symbol of the phase difference that C utilizes pilot tone to estimate is consistent with the symbol of the phase difference estimation of preservation, then keep phase difference value constant; If the symbol of the phase difference estimation of preserving just is, φ value is negative, then φ is added 2 π and estimate phase difference as revised frequency deviation; If the symbol of the phase difference estimation of preserving is negative, φ value is just, then φ value is deducted 2 π as revised phase difference value;
D, according to revised phase difference, phase compensation is carried out to upstream data.
Preferably, steps A comprises:
The data d2 of the one piece of data d1 in the sub-frame of uplink CP that A1, extraction receive and the corresponding CP in OFDM symbol rear portion;
A2, fast Fourier transform is carried out to d1 and d2, obtain frequency domain data D1 and D2;
A3, the subcarrier corresponding to frequency domain data D1 and D2 make related operation, and the value of all subcarrier related operations of each Physical Resource Block PRB is added and obtains a complex values;
A3, steps A 1 to A3 is performed respectively for each OFDM symbol of sub-frame of uplink, then the complex values corresponding to same PRB is added;
A5, phase place is got to these complex values, preserve the phase symbol of each PRB;
A6, PRB position occupied by user, be added the value of symbol of correspondence, if result is just, representing positive phase, is negative indication minus phase.
Preferably, A6 comprises further: set PRB positional number occupied by user as L, if L>2, be then added by symbol corresponding for all the other PRB after removing 1 PRB end to end respectively by the PRB occupied by user again, if L<=2, then do not remove PRB.
As can be seen from the above technical solutions, the data portion corresponding according to CP and CP of the sub-frame of uplink received assigns to carry out phase difference estimation, and preserve the sign estimating phase difference, utilize the phase difference between ascending pilot frequency estimate symbol, utilize the frequency deviation of preserving to estimate that the sign of phase difference corrects the phase difference that pilot tone obtains, obtain last compensation of phase value.Technical scheme can be carried out wider frequency deviation relative to prior art and be estimated, be applicable to the application scenarios that subscriber equipment movement velocity is higher, thus solve preferably uplink frequency offset larger time data receiver poor-performing problem, improve the receiving efficiency of upstream data.
Accompanying drawing explanation
Fig. 1 is the schematic diagram extracting data division corresponding to CP and CP in the embodiment of the present application;
Fig. 2 is the actual phase difference of two row pilot tones and the relation schematic diagram of the phase difference estimated;
Fig. 3 is carrier frequency when being 2.6GHz, the relation schematic diagram of subscriber equipment movement velocity and frequency deviation;
The method flow diagram that a kind of uplink frequency offset that Fig. 4 provides for the embodiment of the present application compensates.
Embodiment
The method that uplink frequency offset that the application provides compensates, its basic thought is, first, assigns to carry out phase difference estimation, then preserve the sign of estimation phase difference according to the Cyclic Prefix (CP) of the sub-frame of uplink received and data portion corresponding to CP; Then, utilize the phase difference between ascending pilot frequency estimate symbol, utilize the sign of the phase difference preserved to correct the phase difference that pilot tone obtains, obtain last compensation of phase value.
For making the know-why of technical scheme, feature and technique effect clearly, below in conjunction with specific embodiment, technical scheme is described in detail.
Utilize CP to carry out phase difference estimation, be the data division that CP and CP of each OFDM (OFDM) symbol of an extraction sub-frame of uplink is corresponding, as shown in Figure 1, it considers channel multi-path time delay, so be only extracted the partial data of CP.
Suppose that bandwidth is 20M, to the FFT conversion that d1 and d2 extracted carries out at 2048, obtain frequency domain data D1 and D2.Then related operation is carried out to D1 and D2, obtain the symbol of phase difference estimation, specifically comprise: 1200 useful in extraction frequency domain data D1 and D2 are carried out related operation, and each OFDM symbol obtains 1200 complex values, corresponding 1200 subcarriers.The complex values of 12 subcarriers of each Physical Resource Block (PRB) correspondence is added, finally obtains 100 complex values, corresponding 100 PRB.The complex values that 14 OFDM symbol of the sub-frame of uplink that each PRB is corresponding obtain is added.Phase place is got to these complex values, phase symbol is expressed as-1,1}, represent minus phase respectively, positive phase.Preserve the phase symbol value of 100 PRB.PRB position occupied by user, is added the value of symbol of correspondence, if result is just, representing positive phase, is negative indication minus phase.
Utilizing pilot signal to estimate phase difference, is utilize the phase difference of two row pilot tones in a up subframe to realize.When moving velocity of terminal is very fast, the phase difference utilizing pilot tone to estimate and actual phase difference have difference, as shown in Figure 2:
If carrier frequency is 2.6Hz, then the frequency deviation that during terminal high-speed motion, uplink receiving data produce and the relation of terminal velocity are as shown in Figure 3.As can be seen from Figure 3, when user movement speed is 222.5km/h ~ 445km/h, the scope of the phase difference between two row pilot tones is π ~ 2 π, but the value of actual measurement is-π ~ 0.In like manner, when user movement speed is-222.5km/h ~-445km/h, the phase range between two row pilot tones is-π ~-2 π, but the scope of measurement result is 0 ~ π.
According to above-mentioned characteristic, if the speed of user movement is lower than 445km/h, be φ according to the phase difference that pilot tone records, then:
If φ is consistent with the phase difference symbol of estimation, then φ value is not revised.
If the phase difference symbol of φ and estimation is inconsistent, and 0 < φ≤π, then revising φ value is: φ=φ-2 π; If-π < φ≤0, then revising φ value is: φ=φ+2 π.
Later use φ value compensates channel estimation value.
Suppose that base station is made up of BBU and RRU, then concrete steps of the present invention are as follows:
RRU performs following operation:
Step 401: the data d2 of the one piece of data d1 in the sub-frame of uplink CP that extraction receives and the corresponding CP in OFDM symbol rear portion;
Step 402: 0 to 2048 points are mended to both afterbodys;
Step 403: the FFT operation doing at 2048 to d1 and d2, obtains D1 and D2 respectively;
Step 404: centre 1200 point data of getting D1 and D2, corresponding 100 PRB, 1200 subcarriers; The subcarrier that D1 and D2 is corresponding carries out related calculation, and the value of all subcarrier related operations of each PRB is added and obtains a complex values, finally obtains the result of 100 PRB.
Step 405: each OFDM symbol carries out the operation of step 401 to step 405, the results added of 14 symbols, obtains 100 final complex values.
Step 406: get phase place to 100 complex values, obtains 100 phase value K(n), get symbol S (n) of phase value, S (n) is passed to BBU.
BBU holds operation:
Step 407: extract corresponding data k (m) according to L PRB position of CU from S (n).Preferably, if L>2, then respectively removing 1 PRB end to end, if L<=2, then PRB need not be removed.
Such as, have 100 PRB under 20M bandwidth, certain user only may occupy wherein 5 PRB, then only need the phase value symbol composition data k(m extracting these 5 PRB).Under 20M bandwidth, n is 1 ~ 100, represents the sequence number of PRB, and m is the PRB sequence number of user, if certain user is assigned with 5 PRB, then m is 1 ~ 5.
Step 408: k (m) is added, obtains S.Such as, CU 5 PRB, then the value of k (m) is likely [1 ,-1,1,1,-1], after being added, S value is 1, represents that end product is just, if the value of k (m) is [1 ,-1,-1 ,-1 ,-1], after being added, S value is-3, represents that end product is negative.
Step 409: calculate phase difference according to pilot tone
Step 410: if
consistent with S symbol, perform step 412, otherwise perform step 413.
Step 411: if S>0, then
otherwise
Step 412: use
subscriber channel estimated value is compensated.
The foregoing is only the preferred embodiment of the application; not in order to limit the protection range of the application; within all spirit in technical scheme and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.
Claims (3)
1. a method for uplink frequency offset compensation, is characterized in that, comprising:
A, assign to carry out phase difference estimation according to the cyclic prefix CP of sub-frame of uplink received and data portion corresponding to CP, and preserve the symbol of phase difference estimation;
B, utilize the pilot tone in a sub-frame of uplink to carry out phase difference estimation, obtain the phase difference estimated;
If the symbol of the phase difference that C utilizes pilot tone to estimate is consistent with the symbol of the phase difference estimation of preservation, then keep phase difference value constant; If the symbol of the phase difference estimation of preserving just is, φ value is negative, then φ is added 2 π and estimate phase difference as revised frequency deviation; If the symbol of the phase difference estimation of preserving is negative, φ value is just, then φ value is deducted 2 π as revised phase difference value;
D, according to revised phase difference, phase compensation is carried out to upstream data.
2. method according to claim 1, is characterized in that, steps A comprises:
The data d2 of the one piece of data d1 in the sub-frame of uplink CP that A1, extraction receive and the corresponding CP in OFDM symbol rear portion;
A2, fast Fourier transform is carried out to d1 and d2, obtain frequency domain data D1 and D2;
A3, the subcarrier corresponding to frequency domain data D1 and D2 make related operation, and the value of all subcarrier related operations of each Physical Resource Block PRB is added and obtains a complex values;
A3, steps A 1 to A3 is performed respectively for each OFDM symbol of sub-frame of uplink, then the complex values corresponding to same PRB is added;
A5, phase place is got to these complex values, preserve the phase symbol of each PRB;
A6, PRB position occupied by user, be added the value of symbol of correspondence, if result is just, representing positive phase, is negative indication minus phase.
3. method according to claim 2, it is characterized in that, A6 comprises further: set PRB positional number occupied by user as L, if L>2, then symbol corresponding for all the other PRB is added by PRB occupied by user respectively after removing 1 PRB end to end again, if L<=2, then do not remove PRB.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017157122A1 (en) * | 2016-03-18 | 2017-09-21 | 中兴通讯股份有限公司 | Phase compensation method and apparatus for pusch channel |
| CN107347043A (en) * | 2016-05-06 | 2017-11-14 | 三星电子株式会社 | The method of receiver and in the receiver compensating carrier frequency offset |
| CN108282421A (en) * | 2017-01-05 | 2018-07-13 | 普天信息技术有限公司 | A kind of method of uplink control channel offset estimation |
| CN115333911A (en) * | 2022-08-15 | 2022-11-11 | 四川创智联恒科技有限公司 | Frequency offset estimation method based on pilot frequency in OFDM system |
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| US20080002564A1 (en) * | 2006-06-29 | 2008-01-03 | Motorola, Inc. | Orthogonal frequency division multiple access message processing method and apparatus |
| CN102137048A (en) * | 2010-01-22 | 2011-07-27 | 中兴通讯股份有限公司 | Method and system for frequency offset estimation |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080002564A1 (en) * | 2006-06-29 | 2008-01-03 | Motorola, Inc. | Orthogonal frequency division multiple access message processing method and apparatus |
| CN102137048A (en) * | 2010-01-22 | 2011-07-27 | 中兴通讯股份有限公司 | Method and system for frequency offset estimation |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017157122A1 (en) * | 2016-03-18 | 2017-09-21 | 中兴通讯股份有限公司 | Phase compensation method and apparatus for pusch channel |
| CN107347043A (en) * | 2016-05-06 | 2017-11-14 | 三星电子株式会社 | The method of receiver and in the receiver compensating carrier frequency offset |
| CN107347043B (en) * | 2016-05-06 | 2021-09-28 | 三星电子株式会社 | Receiver and method for compensating carrier frequency offset in receiver |
| CN108282421A (en) * | 2017-01-05 | 2018-07-13 | 普天信息技术有限公司 | A kind of method of uplink control channel offset estimation |
| CN108282421B (en) * | 2017-01-05 | 2020-11-27 | 普天信息技术有限公司 | Method for estimating frequency offset of uplink control channel |
| CN115333911A (en) * | 2022-08-15 | 2022-11-11 | 四川创智联恒科技有限公司 | Frequency offset estimation method based on pilot frequency in OFDM system |
| CN115333911B (en) * | 2022-08-15 | 2023-04-07 | 四川创智联恒科技有限公司 | Frequency offset estimation method based on pilot frequency in OFDM system |
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