CN102006116A - Frequency offset precompensation method and device - Google Patents
Frequency offset precompensation method and device Download PDFInfo
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- CN102006116A CN102006116A CN2009100919852A CN200910091985A CN102006116A CN 102006116 A CN102006116 A CN 102006116A CN 2009100919852 A CN2009100919852 A CN 2009100919852A CN 200910091985 A CN200910091985 A CN 200910091985A CN 102006116 A CN102006116 A CN 102006116A
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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
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0018—Arrangements at the transmitter end
- H04L2027/002—Arrangements at the transmitter end using feedback from a remote receiver
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Abstract
The invention discloses a frequency offset precompensation method which comprises the following steps: a base station estimates the frequency offset according to an uplink signal of a user terminal, and compensates the frequency offset of the downlink signal transmitted to the user terminal according to the estimated value of the frequency offset. The invention also discloses a frequency offset precompensation device which comprises a frequency offset estimation unit and a first frequency offset compensation unit, wherein the frequency offset estimation unit is used for estimating the frequency offset according to the uplink signal of the user terminal; and the first frequency offset compensation unit is used for compensating the frequency offset of the downlink signal transmitted to the user terminal according to the estimated value of the frequency offset. The invention is used for compensating the frequency offset for a user terminal in high-speed movement, especially for the user terminal in high-speed movement in the switching process, thereby ensuring the communication quality of the user terminal.
Description
Technical field
The present invention relates to the frequency deviation pre-compensation technology, relate in particular to the method and apparatus that in a kind of wireless communication system the user terminal of high-speed mobile is carried out frequency deviation pre-compensation.
Background technology
Because user terminal is mobile in the wireless communication system, the adverse effect that user terminal is produced when receiving wireless signal is mainly reflected in aspect multipath effect and the Doppler frequency deviation two.Especially user terminal is in the scene of fast moving, move on high-speed railway or highway such as user terminal, its suffered Doppler frequency deviation is just quite serious, the adverse effect concrete manifestation that it brings is 2 points below: 1) when user terminal is positioned at inside, sub-district, the signal frequency that signal frequency that user terminal receives and base station send is owing to the influence of Doppler effect exists frequency departure.The frequency of supposing the signal that the base station sends is F, and the frequency deviation that Doppler effect caused is x, and the received signal frequency of user terminal is F-x so.If user terminal is that F carries out demodulation according to signal frequency also, certainly will cause error.2) if the UE operating frequency is locked in F-x, and send upward signal with this frequency, that base station has just become F-2x in the up signal frequency that receives, and frequency error further enlarges, and produces more adverse influence for the correct demodulation in base station.3) when user terminal is positioned at the intersection of two sub-districts, because the descending frequency deviation of two sub-districts is opposite fully, so user terminal meets with the frequency deviation of twice when switching.Promptly when former sub-district A, the signal frequency that user terminal receives is F-x; When switching to new sub-district B, the signal frequency that user terminal receives becomes F+x, during produced 2x the frequency deviation saltus step.
More than some problems be under the low-speed motion state equally at user terminal and exist, but because the translational speed of user terminal is lower, the Doppler frequency deviation that is produced is in tolerable scope.But the translational speed of user terminal increases under high-speed motion state, and Doppler frequency deviation value x also direct proportion ground increases, and is 250km/h such as the speed of a motor vehicle of present motor train unit, and the Doppler frequency deviation value x of subscriber terminal side reaches about 460Hz; Under magnetic suspension train scene more at a high speed, the speed of a motor vehicle is 430km/h, and the Doppler frequency deviation value x of subscriber terminal side approximates 800Hz, and the frequency deviation saltus step when switch the sub-district is more up to about 1600Hz.Yet present most user terminal does not possess the correction capability of big frequency deviation, under this kind scene, often causes call drop, causes the service quality of communication system not high.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and apparatus of frequency deviation pre-compensation, can carry out compensate of frequency deviation to downstream signal when the user terminal high-speed motion, guarantees that the quality of service of user terminal is not affected substantially.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of frequency deviation pre-compensation comprises:
Frequency offset estimating is carried out according to the upward signal of user terminal in the base station, and according to the frequency offset estimating value downstream signal that sends to described user terminal is carried out compensate of frequency deviation.
Preferably, frequency offset estimating is carried out according to the upward signal of user terminal in described base station, comprising:
The frequency of the upward signal of the described user terminal that receives is detected in described base station, and the difference between the upward signal frequency of the frequency of the upward signal that receives that estimation is detected and the emission of described user terminal is as the frequency offset estimating value.
Preferably, the difference between the upward signal frequency of the frequency of the upward signal that receives that the estimation of described base station is detected and the emission of described user terminal specifically comprises:
Receive the upward signal of described user terminal by the remote radio unit (RRU) RRU in the described base station, after down-converted, send to the baseband processing unit BBU in the described base station, by described BBU the upward signal that RRU sends is estimated, determined the frequency offset estimating value of this upward signal.
Preferably, the frequency values f of described frequency deviation pre-compensation
PreIt is the function of frequency offset estimating value x.
Preferably, the frequency values of described frequency deviation pre-compensation is the function of frequency offset estimating value, comprising: f
Pre=X, perhaps f
Pre=-X, perhaps f
Pre=2X, perhaps f
Pre=-2X.
Preferably, described BBU is the frequency values that described user terminal is determined the frequency deviation pre-compensation of downstream signal according to the frequency deviation value of the upward signal that estimates, and controls described RRU and by the frequency values of determined frequency deviation pre-compensation the downstream signal of emission is carried out precompensation; And described RRU sends to described user terminal after downstream signal is carried out precompensation.
Preferably, under the scene of minizone switching, described method also comprises for user terminal:
The base station of switching preceding sub-district sends to radio network controller (RNC) with the frequency offset estimating value of the upward signal of described user terminal, RNC is transmitted to this frequency offset estimating value the base station of target switching cell then, the base station of described target switching cell is the frequency values that described user terminal is determined the frequency deviation pre-compensation of downstream signal according to received frequency offset estimating value, after by the frequency values of determined frequency deviation pre-compensation downstream signal being carried out precompensation, send to described user terminal.
Preferably, described method also comprises:
Described BBU determines that described user terminal is when switching among the target RRU among the RRU before switching, determine the frequency values of the frequency deviation pre-compensation of the downstream signal that is transmitted to described user terminal among the described target RRU according to the upward signal frequency offset estimating value of user terminal described in the RRU before described switching, described target RRU sends to described user terminal after by the frequency values of determined frequency deviation pre-compensation downstream signal being carried out precompensation.
A kind of device of frequency deviation pre-compensation comprises:
Frequency deviation estimating unit is used for carrying out frequency offset estimating according to the upward signal of user terminal; And
First frequency offset compensation element is used for according to the frequency offset estimating value of described frequency deviation estimating unit the downstream signal that sends to described user terminal being carried out compensate of frequency deviation.
Preferably, described frequency deviation estimating unit comprises:
Receiving element is used to receive the upward signal of described user terminal;
Detecting unit is used to detect the frequency of the upward signal of described user terminal; And
Determining unit is used to determine the difference between the upward signal tranmitting frequency of the upward signal frequency that detected and the emission of described user terminal, as the frequency offset estimating value.
Preferably, described device also comprises:
Notification unit is used for and will switches the frequency offset estimating value of the upward signal of user terminal described in the base station of preceding sub-district by radio network controller (RNC) notification target base station;
Second frequency offset compensation element, be arranged in described target BS, the frequency offset estimating value that is used for notifying according to described notification unit is the frequency values that described user terminal is determined the frequency deviation pre-compensation of downstream signal, by the frequency values of determined frequency deviation pre-compensation downstream signal is carried out precompensation; And
Transmitting element is used for the downstream signal behind the frequency deviation pre-compensation is sent to described user terminal.
Preferably, described frequency deviation estimating unit is arranged in the BBU of base station; Described first frequency offset compensation element and described second frequency offset compensation element are arranged in the RRU of base station.
The present invention is when user terminal is mobile in single subdistrict, for it carries out frequency offset estimating and the downstream signal of user terminal is carried out frequency deviation pre-compensation, and when user terminal relates to switching two moving between cells, the present invention can carry out the frequency deviation pre-compensation of downstream signal equally in time to the user terminal after switching, thereby can guarantee the correct demodulation of user terminal downstream signal, guarantee the downlink business quality of user terminal.The present invention by to the user terminal of high-speed mobile particularly the user terminal of the high-speed mobile in the handoff procedure carry out good frequency deviation pre-compensation, thereby guaranteed the communication quality of user terminal.
Description of drawings
Fig. 1 is the flow chart of method of the frequency deviation pre-compensation of the embodiment of the invention one;
Fig. 2 is the flow chart of method of the frequency deviation pre-compensation of the embodiment of the invention two;
Fig. 3 is the flow chart of method of the frequency deviation pre-compensation of the embodiment of the invention three;
Fig. 4 is the composition structural representation of the device of frequency deviation pre-compensation of the present invention;
Fig. 5 is the composition structural representation of frequency deviation estimating unit of the present invention.
Embodiment
Basic thought of the present invention is: when user terminal is mobile in single subdistrict, for it carries out frequency offset estimating and the downstream signal of user terminal is carried out compensate of frequency deviation, and when user terminal relates to switching two moving between cells, the present invention can carry out the compensate of frequency deviation of downstream signal to the user terminal after switching equally in time, thereby can guarantee the correct demodulation of user terminal upward signal.
In addition, for the situation of user terminal two minizones switchings, before switching, the base station A of former sub-district is to radio network controller (RNC, Radio Network Controller) report the Doppler frequency deviation of its estimated user terminal, RNC issues the Doppler frequency deviation of this user terminal to the base station of new sub-district B.Base station A and the affiliated base station B in new sub-district signal down to each user terminal respectively and carry out positive and negative opposite frequency deviation pre-compensation under the former sub-district, wherein, base station A carries out positive compensate of frequency deviation, and base station B carries out the negative frequency deviation compensation, makes terminal descending frequency deviation of actual reception in handoff procedure seamlessly transit as far as possible.
The present invention by to the user terminal of high-speed mobile particularly the user terminal of the high-speed mobile in the handoff procedure carry out good compensate of frequency deviation, thereby guaranteed the communication quality of user terminal.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Between user terminal and the base station when setting up Radio Link, can arrange a frequency F who sends signal mutually, but because the Doppler effect that produced at the volley of user terminal, make the base station send to the signal frequency F of user terminal and this user terminal actual reception to frequency between exist frequency departure x.X is exactly a Doppler frequency deviation.Its value is directly proportional with the speed of user terminal.
Wherein, v represents the translational speed of user terminal, and c represents the light velocity, is 3 * 10
8M/s, θ represent the wireless signal of user terminal and the angle between its direction of motion, f
RFThe frequency of expression carrier wave, the frequency F of the mutual transmission signal of promptly arranging between base station and the user terminal.
Because the existence of Doppler frequency deviation makes the demodulation of user terminal produce difficulty, if and user terminal sends upward signal by the frequency F-x that receives, arrived the frequency departure that base station side has more x again so, make up base station receive signal frequency and become F-2x, again the correct demodulation of base station has been produced influence conversely.
In addition, when user terminal when a sub-district switches to another sub-district, the angle between it and the former cell base station is 180 degree, and the angle between the new cell base station is negative 180 degree, so from formula (1) as can be known, this user terminal has produced 2 times frequency deviation saltus step when switching.This correct receiving demodulation to user terminal is especially disadvantageous.
The rough sledding that Doppler frequency deviation brought of the user terminal under the high-speed mobile, Doppler frequency deviation compensation method of the present invention can make that up base station received signal is inclined to one side near zero-frequency, and can eliminate the twice frequency deviation saltus step problem of user terminal when cell boarder moves and switches.
Embodiment one
Fig. 1 is the flow chart of method of the frequency deviation pre-compensation of the embodiment of the invention one, and as shown in Figure 1, the method for the frequency deviation pre-compensation of this example may further comprise the steps:
Step 101: when the base station receives upward signal, the upward signal of the user terminal that receives is carried out frequency offset estimating, the frequency deviation value x of the upward signal of this user terminal that obtains.When concrete realization, be that the remote radio unit (RRU) RRU by the base station receives up radiofrequency signal, and carry out down-converted receiving radiofrequency signal, obtain baseband signal, be delivered to the baseband processing unit BBU of base station; BBU estimates its frequency deviation value to this baseband signal.BBU estimates that the Doppler frequency deviation value of baseband signal has multiple implementation, disclose the technical scheme of the method and apparatus of a kind of frequency offset estimating and compensation such as the Chinese patent application that on March 16th, 2005, disclosed publication number was CN1595829A, the Doppler frequency deviation value among the present invention can be carried out frequency offset estimating with reference to the mode of the record of this application file.Also have multiple disclosed method in addition, repeat no more herein.
Step 102: when the base station downstream signal, according to the frequency deviation value of the upward signal of estimated this user terminal that goes out in the previous step downstream signal of this user terminal is carried out frequency deviation pre-compensation, the frequency values of frequency deviation pre-compensation is f
PreIts value is the function of upward signal frequency offset estimating value x, such as f
Pre=2X, promptly the descending transmission signal frequency of real base station is F+2X; Perhaps, f
Pre=X, promptly the descending transmission signal frequency of real base station is F+X.
When specific implementation, by the BBU of base station the frequency values of the frequency deviation pre-compensation of downstream signal is calculated, and, come actual the transmission by RRU then by the descending transmission radiofrequency signal that the RRU that BBU controls the base station generates precompensation.
Step 103: user terminal receives downstream signal, during the actual downstream signal of receiving of user's this moment the band frequency deviation pre-compensation and be subjected to the Doppler effect influence, so the actual downstream signal frequencies of receiving of user terminal is F+f
Pre-X is to work as f in the preferred case
Pre=2X, the actual downstream signal frequencies of receiving of user terminal is F+2X-X=F+X so; Perhaps, f
Pre=X, the actual downstream signal frequencies of receiving of user terminal is F+f
Pre-X=F+X-X=F.
Step 104: the user terminal frequency locking is on this frequency, and to up transmission signal.Work as f
Pre=2X, the signal frequency that this moment, base station side received is F+f
PreTherefore-2X=F has solved the inclined to one side problem of up 2 frequencys multiplication of base station side; Work as f
Pre=X, the downstream signal frequencies that this moment, subscriber terminal side received is F+f
Pre-X=F like this, has offset the Doppler frequency deviation adverse effect that correct demodulation produces to user terminal.
Embodiment two
Fig. 2 is the flow chart of method of the frequency deviation pre-compensation of the embodiment of the invention two, and as shown in Figure 2, when switching between two base stations for user terminal, the method for the frequency deviation pre-compensation of this example may further comprise the steps:
Step 201: the base station A of former sub-district (switching preceding sub-district) carries out frequency offset estimating to the upward signal of the up user terminal that receives, the frequency deviation value x of the upward signal of this user terminal that obtains.
Step 202: base station A carries out frequency deviation pre-compensation according to the uplink frequency offset estimated value of this user terminal to armed downstream signal to this user terminal transmitting downstream signal the time, the frequency values of frequency deviation pre-compensation is f
Pref
PreValue be the function of uplink frequency offset estimated value x, such as f
Pre=X.Make that so the descending frequency deviation of user terminal actual reception is 0 substantially.
When this user terminal moves to cell edge (before switching to the sub-district under the B of base station), base station A is according to the measure strength of user terminal i, the judgement user terminal switches and former sub-district, the Doppler frequency deviation x of this user terminal that while base station A is estimated with it reports RNC, and RNC sends the Doppler frequency deviation estimated value x of this user terminal to the base station of new sub-district B.
Step 203: user terminal receives the downstream signal of base station A before switching, and frequency locking is to the frequency f of this downstream signal
Ue=F+f
PreOn-the X=F.Like this, the descending frequency deviation of this user terminal actual reception is 0 substantially.
Step 204: base station B is to this user terminal transmitting downstream signal the time, and the Doppler frequency deviation estimated value of this user terminal that passes over according to RNC is carried out the negative frequency deviation precompensation to the downstream signal of emission, and promptly the frequency values of frequency deviation pre-compensation is f
Pre=-X.Because after user terminal switched to sub-district on the B of base station, the down-Doplet frequency deviation that it suffered had also changed symbol, so behind the B precompensation of base station, user terminal is f in the descending frequency deviation of sub-district B actual reception
Ue=F+f
Pre+ X=F, descending frequency deviation is 0 substantially still, this user has kept seamlessly transitting of frequency deviation in handoff procedure like this.
Embodiment three
Along the line at high-speed railway, highway, because the linear characteristics of its road often adopt a plurality of remote radio unit (RRU)s (RRU, Remote Radio Unit) to merge and cover circuit when arranging net.When specifically arranging net, the big capacity baseband processing unit in the base station (BBU, Baseband Unit) is concentrated and is placed in the central machine room, adopts optical fiber to connect and moves many RRU to RRU; These RRU unit have identical or different type antenna and cover continuously that railway is along the line piecemeal, make the coverage of single subdistrict increase, and be configured to a logic district in the base band side, also be about to a plurality of physical location differences, the different RRU of type is included into a logic district by the mode of Base-Band Processing.
Fig. 3 is the flow chart of method of the frequency deviation pre-compensation of the embodiment of the invention three, as shown in Figure 3, introduce a plurality of RRU unit after, the method for the frequency deviation pre-compensation of this example may further comprise the steps:
Step 301: the RRU unit of base station receives the up radiofrequency signal of user terminal, to send to BBU after its down-conversion, the baseband signal of BBU after to down-conversion estimated the frequency deviation value of the upward signal of this user terminal, and BBU calculates the frequency values of the frequency deviation pre-compensation of the downstream signal that sends to this user terminal, and control RRU carries out precompensation to downstream signal.
Step 302: before user terminal is striden the RRU switching, former RRU unit is when this user terminal transmitting downstream signal, BBU carries out frequency deviation pre-compensation according to the uplink frequency offset estimated value control RRU of this user terminal to the downlink signal, and the frequency values of frequency deviation pre-compensation is f
Pref
PreValue be uplink frequency offset estimated value f
dFunction, such as f
Pre=X; Make the descending frequency deviation of user terminal actual reception approach 0.
Step 303: after user terminal was striden the RRU switching, BBU controlled new RRU unit to this user terminal transmitting downstream signal, the downstream signal of launching was carried out the negative frequency deviation precompensation, i.e. the frequency values f of frequency deviation pre-compensation
Pre=-X.Like this, user terminal is f from the downstream signal frequencies of new RRU unit actual reception after switching
Ue=F+f
Pre+ X=F, frequency deviation also is close to 0.
Fig. 4 is the composition structural representation of the device of frequency deviation pre-compensation of the present invention, as shown in Figure 4, the device of frequency deviation pre-compensation of the present invention comprises the frequency deviation estimating unit 40 and first frequency offset compensation element 41, and wherein, frequency deviation estimating unit 40 is used for carrying out frequency offset estimating according to the upward signal of user terminal.First frequency offset compensation element 41 is used for according to the frequency offset estimating value of frequency deviation estimating unit 40 downstream signal that sends to described user terminal being carried out frequency deviation pre-compensation.
As shown in Figure 4, the device of frequency deviation pre-compensation of the present invention also comprises notification unit 42, second frequency offset compensation element 43 and transmitting element 44, wherein, notification unit 42 is used for and will switches the frequency offset estimating value of the upward signal of user terminal described in the base station of preceding sub-district by RNC notification target base station; Second frequency offset compensation element 43, be arranged in described target BS, being used for according to the frequency offset estimating value that notification unit 42 is notified is the frequency values that described user terminal is determined the frequency deviation pre-compensation of downstream signal, by the frequency values of determined frequency deviation pre-compensation downstream signal is carried out precompensation; Transmitting element 44 is used for the downstream signal behind the frequency deviation pre-compensation is sent to described user terminal.
Frequency deviation estimating unit 40 is arranged in the BBU of base station; First frequency offset compensation element 41 and second frequency offset compensation element 43 are arranged in the RRU of base station.
Fig. 5 is the composition structural representation of frequency deviation estimating unit of the present invention, as shown in Figure 5, frequency deviation estimating unit 40 of the present invention comprises receiving element 401, detecting unit 402 and determining unit 403, and wherein, receiving element 401 is used to receive the upward signal of described user terminal; Detecting unit 402 is used to detect the frequency of the upward signal of described user terminal; Determining unit 403 is used to determine the difference between the upward signal tranmitting frequency of the upward signal frequency that detected and the emission of described user terminal, as the frequency offset estimating value.
Those skilled in the art are to be understood that, the device of frequency deviation pre-compensation shown in Figure 4 is to be provided with for the method that realizes aforesaid frequency deviation pre-compensation, each processing unit can be understood with reference to the associated description in the earlier figures 1 to Fig. 3 in the device shown in Figure 4, its function can realize by the program that runs on the processor, also can realize by concrete logical circuit.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (12)
1. the method for a frequency deviation pre-compensation is characterized in that, comprising:
Frequency offset estimating is carried out according to the upward signal of user terminal in the base station, and according to the frequency offset estimating value downstream signal that sends to described user terminal is carried out compensate of frequency deviation.
2. method according to claim 1 is characterized in that, frequency offset estimating is carried out according to the upward signal of user terminal in described base station, comprising:
The frequency of the upward signal of the described user terminal that receives is detected in described base station, and the difference between the upward signal frequency of the frequency of the upward signal that receives that estimation is detected and the emission of described user terminal is as the frequency offset estimating value.
3. method according to claim 2 is characterized in that, the difference between the upward signal frequency of the frequency of the upward signal that receives that the estimation of described base station is detected and the emission of described user terminal specifically comprises:
Receive the upward signal of described user terminal by the remote radio unit (RRU) RRU in the described base station, after down-converted, send to the baseband processing unit BBU in the described base station, by described BBU the upward signal that RRU sends is estimated, determined the frequency offset estimating value of this upward signal.
4. according to each described method in the claim 1 to 3, it is characterized in that the frequency values f of described frequency deviation pre-compensation
PreIt is the function of frequency offset estimating value x.
5. method according to claim 4 is characterized in that the frequency values of described frequency deviation pre-compensation is the function of frequency offset estimating value, comprising: f
Pre=X, perhaps f
Pre=-X, perhaps f
Pre=2X, perhaps f
Pre=-2X.
6. method according to claim 4, it is characterized in that, described BBU is the frequency values that described user terminal is determined the frequency deviation pre-compensation of downstream signal according to the frequency deviation value of the upward signal that estimates, and controls described RRU and by the frequency values of determined frequency deviation pre-compensation the downstream signal of emission is carried out precompensation; And described RRU sends to described user terminal after downstream signal is carried out precompensation.
7. method according to claim 1 is characterized in that, under the scene of minizone switching, described method also comprises for user terminal:
The base station of switching preceding sub-district sends to radio network controller (RNC) with the frequency offset estimating value of the upward signal of described user terminal, RNC is transmitted to this frequency offset estimating value the base station of target switching cell then, the base station of described target switching cell is the frequency values that described user terminal is determined the frequency deviation pre-compensation of downstream signal according to received frequency offset estimating value, after by the frequency values of determined frequency deviation pre-compensation downstream signal being carried out precompensation, send to described user terminal.
8. method according to claim 3 is characterized in that, described method also comprises:
Described BBU determines that described user terminal is when switching among the target RRU among the RRU before switching, determine the frequency values of the frequency deviation pre-compensation of the downstream signal that is transmitted to described user terminal among the described target RRU according to the upward signal frequency offset estimating value of user terminal described in the RRU before described switching, described target RRU sends to described user terminal after by the frequency values of determined frequency deviation pre-compensation downstream signal being carried out precompensation.
9. the device of a frequency deviation pre-compensation is characterized in that, comprising:
Frequency deviation estimating unit is used for carrying out frequency offset estimating according to the upward signal of user terminal; And
First frequency offset compensation element is used for according to the frequency offset estimating value of described frequency deviation estimating unit the downstream signal that sends to described user terminal being carried out compensate of frequency deviation.
10. device according to claim 9 is characterized in that, described frequency deviation estimating unit comprises:
Receiving element is used to receive the upward signal of described user terminal;
Detecting unit is used to detect the frequency of the upward signal of described user terminal; And
Determining unit is used to determine the difference between the upward signal tranmitting frequency of the upward signal frequency that detected and the emission of described user terminal, as the frequency offset estimating value.
11. device according to claim 9 is characterized in that, described device also comprises:
Notification unit is used for and will switches the frequency offset estimating value of the upward signal of user terminal described in the base station of preceding sub-district by radio network controller (RNC) notification target base station;
Second frequency offset compensation element, be arranged in described target BS, the frequency offset estimating value that is used for notifying according to described notification unit is the frequency values that described user terminal is determined the frequency deviation pre-compensation of downstream signal, by the frequency values of determined frequency deviation pre-compensation downstream signal is carried out precompensation; And
Transmitting element is used for the downstream signal behind the frequency deviation pre-compensation is sent to described user terminal.
12., it is characterized in that described frequency deviation estimating unit is arranged in the BBU of base station according to each described device in the claim 9 to 11; Described first frequency offset compensation element and described second frequency offset compensation element are arranged in the RRU of base station.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100919852A CN102006116A (en) | 2009-09-03 | 2009-09-03 | Frequency offset precompensation method and device |
| PCT/CN2010/074647 WO2011026372A1 (en) | 2009-09-03 | 2010-06-28 | Method and device for frequency offset precompensation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100919852A CN102006116A (en) | 2009-09-03 | 2009-09-03 | Frequency offset precompensation method and device |
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| CN102006116A true CN102006116A (en) | 2011-04-06 |
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| CN2009100919852A Pending CN102006116A (en) | 2009-09-03 | 2009-09-03 | Frequency offset precompensation method and device |
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| CN102710270B (en) * | 2012-06-15 | 2014-04-30 | 深圳国人通信有限公司 | Radio remote unit and automatic frequency pre-controlling method and device thereof |
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| US7027815B2 (en) * | 2002-09-05 | 2006-04-11 | Qualcomm, Incorporated | Compensating for frequency shift and timing shift in frequency and time tracking loops based on mobile unit velocity |
| US20040248519A1 (en) * | 2003-05-19 | 2004-12-09 | Kari Niemela | Data transmission method, system and network element |
| CN100493061C (en) * | 2005-05-31 | 2009-05-27 | 北京交通大学 | Method of detecting signal by combining compensate of frequency deviation for orthogonal packet in MC-CDMA downlink chain |
| CN101184075B (en) * | 2007-12-13 | 2012-01-04 | 华为技术有限公司 | Frequency deviation compensation method and device |
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2009
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