CN104580049B - A kind of method of uplink frequency offset compensation - Google Patents
A kind of method of uplink frequency offset compensation Download PDFInfo
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- CN104580049B CN104580049B CN201310472816.XA CN201310472816A CN104580049B CN 104580049 B CN104580049 B CN 104580049B CN 201310472816 A CN201310472816 A CN 201310472816A CN 104580049 B CN104580049 B CN 104580049B
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Classifications
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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
Abstract
This application discloses a kind of method of uplink frequency offset compensation, including：A, the data division according to corresponding to the cyclic prefix CP of the sub-frame of uplink of reception and CP carries out phase difference estimation, and preserves the symbol of phase difference estimation；B, phase difference estimation, the phase difference estimated are carried out using the pilot tone in a sub-frame of uplink；If symbol C, using the phase difference of pilot tone estimation is consistent with the symbol of the phase difference estimation of preservation, keep phase difference value constant；If the symbol of the phase difference estimation preserved is just, φ values is negative, then φ are added into 2 π as revised offset estimation phase difference；If the symbol of the phase difference estimation preserved is negative, φ values are just, then φ values to be subtracted into 2 π as revised phase difference value；D, phase compensation is carried out to upstream data according to revised phase difference.Technical scheme can preferably solve the problems, such as data receiver poor-performing when uplink frequency offset is larger, improve the receiving efficiency of upstream data.
Description
Technical field
The application is related to mobile communication technology field, more particularly to a kind of method of uplink frequency offset compensation.
Background technology
In mobile communication system, the high-speed motion of user equipment can cause Doppler frequency shift, for example, if user equipment
Travelled with 300km/h speed, carrier frequency 2.6GHz, then caused maximum doppler frequency is about 722Hz.In up-link
In, the Doppler shift that the motion of user equipment is brought at most can be twice of maximum doppler frequency, that is to say, that Yong Hushe
The standby speed with 300km/h travels, and under conditions of not considering down-going synchronous error, uplink frequency offset can at most reach 1444Hz.
Under this Frequency Offset, if do not taken some measures, upstream data is unable to properly receive.
In existing frequency excursion algorithm, some carries out offset estimation using pilot tone.Such as using physically in LTE
Row shared channel（PUSCH）The phase differences of two row pilot tones in one subframe carries out offset estimation, and this method can be estimated
Maximum frequency deviation in 1071Hz or so, exceeded this scope if up frequency deviation, can not receiving for upward signal will have been caused.And
In the case of the high speeds such as high ferro, the speed of user equipment is possible to that 300km/h can be met or exceeded, if carrier frequency is
2.6GHz, it is contemplated that the error of down-going synchronous is 0.01ppm, and up frequency deviation is up to 1444+260=1704Hz, has exceeded profit
The maximum frequency deviation scope that can be estimated with pilot tone, at this moment data will be unable to receive.
The content of the invention
This application provides a kind of uplink frequency offset compensation method, can preferably solve uplink frequency offset it is larger when data connect
The problem of receiving poor-performing, improve the receiving efficiency of upstream data.
A kind of method for uplink frequency offset compensation that the embodiment of the present application provides, including：
A, the data division according to corresponding to the cyclic prefix CP of the sub-frame of uplink of reception and CP carries out phase difference estimation, and
Preserve the symbol of phase difference estimation；
B, phase difference estimation, the phase difference estimated are carried out using the pilot tone in a sub-frame of uplink；
If symbol C, using the phase difference of pilot tone estimation is consistent with the symbol of the phase difference estimation of preservation, keep
Phase difference value is constant；If the symbol of the phase difference estimation preserved is just, φ values is negative, then φ are added into 2 π as revised
Offset estimation phase difference；If the symbol of the phase difference estimation preserved is negative, φ values are just, then φ values to be subtracted into 2 π as amendment
Phase difference value afterwards；
D, phase compensation is carried out to upstream data according to revised phase difference.
It is preferred that step A includes：
One piece of data d1 and OFDM symbol rear portion in the sub-frame of uplink CP that A1, extraction receive correspond to CP data d2；
A2, Fast Fourier Transform (FFT) is carried out to d1 and d2, obtain frequency domain data D1 and D2；
A3, make related operation, each Physical Resource Block PRB all sub- loads to subcarrier corresponding to frequency domain data D1 and D2
The value of ripple related operation is added to obtain a complex values；
A3, each OFDM symbol for sub-frame of uplink perform step A1 to A3 respectively, then will correspond to same PRB
Complex values be added；
A5, phase is taken to these complex values, preserve each PRB phase symbol；
A6, the PRB positions according to occupied by user, corresponding value of symbol is added, if result is just, represents positive
Position, is negative indication minus phase.
It is preferred that A6 further comprises：If the PRB positional numbers occupied by user are L, if L>2, then by occupied by user
The symbol that PRB respectively again answers remaining PRB pair after 1 PRB is removed end to end is added, if L<=2, then do not remove PRB.
As can be seen from the above technical solutions, the data division according to corresponding to the CP and CP of the sub-frame of uplink of reception is carried out
Phase difference estimation, and the sign of estimation phase difference is preserved, using the phase difference between ascending pilot frequency estimate symbol, utilize preservation
The sign of offset estimation phase difference is corrected to the phase difference that pilot tone obtains, and obtains compensation phase value to the end.The application
Technical scheme can carry out larger range of offset estimation relative to prior art, higher suitable for user equipment movement velocity
Application scenarios, so as to preferably solve the problems, such as data receiver poor-performing when uplink frequency offset is larger, improve connecing for upstream data
Produce effects rate.
Brief description of the drawings
Fig. 1 is the schematic diagram that data division corresponding to CP and CP is extracted 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 user equipment movement velocity and frequency deviation；
Fig. 4 is a kind of method flow diagram for uplink frequency offset compensation that the embodiment of the present application provides.
Embodiment
The method for the uplink frequency offset compensation that the application provides, its basic thought is, first, according to the sub-frame of uplink of reception
Cyclic prefix（CP）With CP corresponding to data division carry out phase difference estimation, then preserve the sign of estimation phase difference；
Then, using the phase difference between ascending pilot frequency estimate symbol, the phase obtained using the sign of the phase difference of preservation to pilot tone
Difference is corrected, and obtains compensation phase value to the end.
To make the technical principle of technical scheme, feature and technique effect clearer, below in conjunction with specific reality
Example is applied technical scheme is described in detail.
Phase difference estimation is carried out using CP, is each OFDM for extracting a sub-frame of uplink（OFDM）Symbol
CP and CP corresponding to data division, as shown in figure 1, it considers channel multi-path delay, so being only extracted CP part
Data.
Assuming that with a width of 20M, 2048 points of FFT is carried out to the d1 and d2 of extraction, obtains frequency domain data D1 and D2.So
Related operation is carried out to D1 and D2 afterwards, the symbol of phase difference estimation is obtained, specifically includes：Extract useful in frequency domain data D1 and D2
1200 points of progress related operations, each OFDM symbol obtains 1200 complex values, corresponding 1200 subcarriers.To each physics
Resource block（PRB）The complex values of corresponding 12 subcarriers are added, and finally obtain 100 complex values, corresponding 100 PRB.Each
The complex values that 14 OFDM symbols of the sub-frame of uplink that PRB pair is answered obtain are added.These complex values are taken with phase, phase symbol
Number { -1,1 } is expressed as, represents minus phase, positive phase respectively.Preserve 100 PRB phase symbol value.According to occupied by user
PRB positions, corresponding value of symbol is added, if result for just, represents positive phase, is negative indication minus phase.
Estimate phase difference using pilot signal, realized using the phase difference of two row pilot tones in a up subframe.
When moving velocity of terminal is very fast, there is difference using the phase difference and actual phase difference of pilot tone estimation, as shown in Figure 2：
If carrier frequency is 2.6Hz, the pass of frequency deviation and terminal velocity caused by uplink receiving data when terminal high-speed moves
System is as shown in Figure 3.From figure 3, it can be seen that when user movement speed is 222.5km/h~445km/h, between two row pilot tones
The scope of phase difference be the π of π~2, but the value actually measured is-π~0.Similarly, when user movement speed is -222.5km/h
During~-445km/h, phase range between two row pilot tones is the π of-π~-2, but the scope of measurement result is 0~π.
According to above-mentioned characteristic, if the speed of user movement is less than 445km/h, the phase difference measured according to pilot tone is φ,
Then：
If φ is consistent with the phase difference symbol estimated, to φ values without amendment.
If φ and the phase difference symbol estimated are inconsistent, and 0 ＜ φ≤π, then correcting φ values is：φ=φ -2 π；Such as
Fruit-π ＜ φ≤0, then correcting φ values is：The π of φ=φ+2.
Later use φ values compensate to channel estimation value.
Assuming that base station is made up of BBU and RRU, then it is of the invention comprise the following steps that shown in：
RRU performs following operation：
Step 401：Extract the one piece of data d1 in the sub-frame of uplink CP received and OFDM symbol rear portion corresponds to CP data
d2；
Step 402：0 to 2048 points are mended to both afterbodys；
Step 403：2048 points of FFT operations are done to d1 and d2, respectively obtain D1 and D2；
Step 404：Take the D1 and D2 point data of centre 1200, corresponding 100 PRB, 1200 subcarriers；D1 and D2 is corresponding
Subcarrier carry out related calculation, the value of each PRB all subcarrier related operations is added to obtain a complex values, finally obtains
100 PRB result.
Step 405：Each OFDM symbol carries out operation of the step 401 to step 405, the results added of 14 symbols,
Obtain 100 final complex values.
Step 406：Phase is taken to 100 complex values, obtains 100 phase value K（n）, the symbol S (n) of phase value is taken, will
S (n) is transmitted to BBU.
BBU ends operate：
Step 407：The data k (m) according to corresponding to L PRB position of user occupancy is extracted from S (n).It is preferred that such as
Fruit L>2, then removing 1 PRB end to end respectively, if L<=2, then do not have to remove PRB.
For example, there is 100 PRB under 20M bandwidth, some user may only take up wherein 5 PRB, then only need to extract
This 5 PRB phase value symbol composition data k（m）.Under 20M bandwidth, n is 1~100, represents PRB sequence number, and m is user's
PRB sequence numbers, if some user is assigned with 5 PRB, m is 1~5.
Step 408：K (m) is added, obtains S.For example, 5 PRB of user occupancy, then k (m) value be possible to for [1 ,-
1,1,1, -1], S values are 1 after addition, represent end product as just, if k (m) value is [1, -1, -1, -1, -1], S after addition
It is worth for -3, represents that end product is negative.
Step 409：Phase difference is calculated according to pilot tone
Step 410：IfIt is consistent with S symbol, step 412 is performed, otherwise performs step 413.
Step 411：If S>0, thenOtherwise
Step 412：WithSubscriber channel estimate is compensated.
The foregoing is only the preferred embodiment of the application, not to limit the protection domain of the application, it is all
Within the spirit and principle of technical scheme, any modification, equivalent substitution and improvements done etc., this Shen should be included in
Within the scope of please protecting.
Claims (2)
- A kind of 1. method of uplink frequency offset compensation, it is characterised in that including：A, the data division according to corresponding to the cyclic prefix CP of the sub-frame of uplink of reception and CP carries out phase difference estimation, and preserves The symbol of phase difference estimation；B, phase difference estimation, the phase difference estimated are carried out using the pilot tone in a sub-frame of uplink；If symbol C, using the phase difference of pilot tone estimation is consistent with the symbol of the phase difference estimation of preservation, phase is kept Poor φ values are constant；If the symbol of the phase difference estimation preserved is just, φ values is negative, then φ are added into 2 π as revised frequency deviation Estimate phase difference；If the symbol of the phase difference estimation preserved is negative, φ values are just, then φ values to be subtracted into 2 π as revised Phase difference value；D, phase compensation is carried out to upstream data according to revised phase difference；Wherein, step A includes：One piece of data d1 and OFDM symbol rear portion in the sub-frame of uplink CP that A1, extraction receive correspond to CP data d2；A2, Fast Fourier Transform (FFT) is carried out to d1 and d2, obtain frequency domain data D1 and D2；A3, make related operation, each Physical Resource Block PRB all subcarrier phases to subcarrier corresponding to frequency domain data D1 and D2 The value for closing computing is added to obtain a complex values；A3, each OFDM symbol for sub-frame of uplink perform step A1 to A3 respectively, then by answering corresponding to same PRB Numerical value is added；A5, phase is taken to these complex values, preserve each PRB phase symbol；A6, the PRB positions according to occupied by user, corresponding value of symbol is added, if result is just, is represented positive phase, is Negative indication minus phase.
- 2. according to the method for claim 1, it is characterised in that A6 further comprises：If the PRB positional numbers occupied by user For L, if L>2, then the symbol remaining PRB pair answered to the PRB occupied by user again after 1 PRB is removed end to end respectively is added, If L<=2, then do not remove PRB.
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| CN107204946B (en) * | 2016-03-18 | 2021-05-04 | 中兴通讯股份有限公司 | Phase compensation method and device for PUSCH (physical uplink shared channel) |
| US9887869B2 (en) * | 2016-05-06 | 2018-02-06 | Samsung Electronics Co., Ltd. | Method of compensating carrier frequency offset in receivers |
| 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 |
| 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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