CN103716896B - Method and device for frequency offset estimation and compensation - Google Patents
Method and device for frequency offset estimation and compensation Download PDFInfo
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- CN103716896B CN103716896B CN201210378006.3A CN201210378006A CN103716896B CN 103716896 B CN103716896 B CN 103716896B CN 201210378006 A CN201210378006 A CN 201210378006A CN 103716896 B CN103716896 B CN 103716896B
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Abstract
The invention discloses a method and device for frequency offset estimation and compensation. The method comprises the following steps: maximum diameter position information is determined according to leading information of a current random access channel (RACH); current frame message information corresponding to the leading information of the current RACH is received at a position corresponding to the determined maximum diameter position information; frequency offset estimation is carried out by utilizing control information contained by the current frame message information so as to obtain a frequency offset estimation value and frequency offset compensation is carried out. Because the frequency offset estimation is carried out by utilizing control information contained in the message information of the current RACH, a problem that the frequency offset estimation value obtained by calculation can not meet the requirement of the message information corresponding to the leading information due to the sudden change of the channel frequency offset when the frequency offset estimation is carried out by utilizing the leading information of the RACH and the practicability is reduced can be solved; the practicability of the frequency offset estimation value is enhanced; the operation is simplified; and the hardware resource consumption is reduced under the circumstances that the operation precision is ensured.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly, to a kind of offset estimation and the method and apparatus compensating.
Background technology
WCDMA（WCDMA）As one of three kinds of main flow 3G standards in the world, high-quality biography can not only be provided
The service of system speech business, additionally it is possible to provide the service of the multimedia service similar to fixed network, before providing service, determines industry
Business RACH is a very important step.
Described RACH（Random Access Channel, RACH）It is a kind of uplink transport channel, in business
Need before starting execution to first pass through RACH access, and communicated after setting up service link, be mainly used in starting up of terminal
During registration access to communication networks, position mobile after network location information when updating etc., for example：Mobile station needs to set up with network side
Communication, need to send a message by RACH to network side it is therefore an objective to one signaling channel of network side application, and network side is by root
To be determined as the channel type of mobile station distribution according to the channel request that RACH carries.
Wherein, RACH contains preface information and information, and wherein, preface information is effective by 16 bits randomly choosing
Signature sequence repeats 256 compositions；Time interval TTI of information transmission can be 10ms（Now, comprise a frame in RACH to disappear
Breath information）Or 20ms（Now, two frame message information are comprised in RACH）.As shown in figure 1, being RACH preface information and message letter
Breath transmits schematic diagram, and its operation principle is：Terminal persistently sends RACH preface information, until AICH（I.e. capture instruction）On obtain
The response confirming, starts the transmission of RACH information, wherein, between the preface information of a RACH and the information of this RACH
There is corresponding relation, when comprising a frame message information in RACH, the preface information of a RACH is to should the frame of RACH disappear
Breath information；When comprising two frame message information in RACH, the preface information of a RACH to should RACH two frame message information.
But under existing high ferro scene, mobile terminal is in the motion of high speed, base station sends in receiving terminal
During the preface information of RACH and information, the frequency of signal can change, and produces Doppler effect.But once
There is Doppler effect, then the frequency deviation producing can cause to have a strong impact on to the demodulation of the information of RACH.For example：With reference to 3GPP
Tissue T S25.104 agreement（I.e. R8）If the speed of train is 350 kilometers/hour, base station is receiving the upper of terminal transmission
The maximum Doppler frequency offset that row signal produces can reach 1340Hz.As shown in Fig. 2 showing for the change of high ferro scene lower channel frequency deviation
It is intended to, in fig. 2, at a time, the change of high ferro scene lower channel frequency deviation turns to 1150Hz ~ -1150Hz.
In order to solve to be accurately positioned the frequency deviation size of high ferro scene lower channel, there are following several sides in the prior art
Method：
First method：Increase the Detection task of RACH preface information, carry out offset estimation using RACH is leading, will obtain
Offset estimation value be used for the frequency deviation of RACH information is compensated.
Specific embodiment has two kinds：
1st, using default frequency deviation value method.Concrete mode is：When terminal prepares access network, different with default n
Frequency deviation offset carries out the leading demodulation of RACH, obtains leading amplitude when different frequency deviations compensate；According to the n obtaining a leading width
Degree, is calculated the ratio of n-1 leading amplitude；Using the ratio obtaining, the function of default frequency deviation difference and one of frequency
Difference is asked to obtain n-1 frequency deviation difference between offset compensation value；The frequency deviation obtaining difference is averaged and obtains offset estimation value, and profit
With the offset estimation value obtaining, frequency deviation compensation is carried out to the information of RACH.
2nd, adopt the leading difference method of correlation of RACH.Concrete mode is：First, using the maximum path position determining to leading
Information is made descrambling and de-spreading and is processed；Secondly, the result obtaining is divided into some segments, each segment is carried out at coherent integration
Reason, calculates the estimated value that between adjacent result, phase angle rotates；Finally, calculate frequency deviation according to phase contrast and time difference to estimate
Evaluation, and using the offset estimation value obtaining, frequency deviation compensation is carried out to the information of RACH.
Using default frequency deviation value method, the offset estimation value of determination is relatively coarse, goes back extra consumption hardware resource；Using
The leading difference method of correlation of RACH, when carrying out coherent integration computing, effect of noise is larger, and the offset estimation value of determination is accurate
Degree is relatively low, meanwhile, when determining offset estimation value, does not consider that channel frequency deviation is undergone mutation this factor, therefore, utilizes
First kind of way determines that the offset estimation value accuracy of RACH is relatively low, and practicality is poor.
Second method：Offset estimation is carried out to RACH preface information and information simultaneously.
Specific embodiment is：First, preface information is carried out with frequency deviation pre-estimation and multipath selects；Secondly, according to gained
Path position information descrambling and de-spreading process is carried out to RACH message control information, and carry out frequency deviation pre-compensation；3rd, through correlation
Remove some useless footpaths after computing and irrelevant computing, offset estimation and compensation are carried out to remaining footpath information.Although this mode
Fully utilize RACH preface information and information, and selected twice, twice offset estimation, but computing is multiple
Miscellaneous, carry out having little significance of multipath computing, cause the waste of hardware resource.
In sum, there is the offset estimation value poor accuracy of the RACH of determination in the prior art and practicality is not high
Problem.
Content of the invention
Embodiments provide a kind of method and apparatus determining offset estimation and compensating, for solving prior art
Middle there is a problem of determine the offset estimation value poor accuracy of RACH and practicality is not high.
A kind of method determining offset estimation, methods described includes：
Detect the preface information of current RACH RACH, and maximum path position letter is determined according to described preface information
Breath；
On the corresponding position of maximum diameter positional information determining, receive the corresponding present frame of preface information of described RACH
Information；
Offset estimation is carried out to the control information comprising in described present frame information, obtains present frame information
Offset estimation value.
A kind of equipment determining offset estimation, described equipment includes：
Determine location information module, for detecting the preface information of current RACH RACH, and according to before described
The information of leading determines maximum diameter positional information；
First receiver module, in the described corresponding position of maximum diameter positional information determining that location information module determines
On, receive the preface information corresponding present frame information of described RACH；
First offset estimation value computing module, wraps in the present frame information to described first receiver module reception
The control information containing carries out offset estimation, obtains the offset estimation value of present frame information.
The present invention has the beneficial effect that：
The embodiment of the present invention is to be estimated using the frequency deviation that the control information in the information of current RACH is carried out
Meter, this avoid and carry out after offset estimation using the preface information of RACH, the frequency deviation of channel undergo mutation so that
Calculated offset estimation value can not meet the needs of the corresponding information of preface information, the problem that practicality reduces, and increases
Add the practicality of offset estimation value, simplified operation, decrease the consumption of hardware resource in the case of ensureing operational precision.
Brief description
Fig. 1 is RACH preface information and information transmits schematic diagram；
Fig. 2 is the schematic diagram of high ferro scene lower channel frequency deviation change；
Fig. 3 is the flow chart of a kind of method of determination offset estimation of the embodiment of the present invention one；
Fig. 4 is the flow chart of a kind of method of determination offset estimation of the embodiment of the present invention two；
Fig. 5 is a kind of structural representation of the equipment of determination offset estimation of the embodiment of the present invention three.
Specific embodiment
In order to realize the purpose of the present invention, embodiments provide a kind of offset estimation and the method compensating and set
Standby, maximum diameter positional information is determined according to the preface information of the current RACH detecting, in the maximum diameter position determining
Confidence ceases the preface information corresponding present frame information receiving described RACH on corresponding position, and to described present frame
The control information comprising in information carries out offset estimation, obtains the offset estimation value of present frame information.
Compared with prior art, because the control information in the present frame information using current RACH is entered
The offset estimation of row, this avoid and carry out after offset estimation using the preface information of RACH, the frequency deviation of channel is sent out
So that calculated offset estimation value can not meet the needs of the corresponding information of preface information, practicality drops for raw mutation
Low problem, increased the practicality of offset estimation value, simplified operation, decreases hardware money in the case of ensureing operational precision
The consumption in source.
With reference to Figure of description, the embodiment of the present invention is described in detail.
Embodiment one：
As shown in figure 3, the flow chart of a kind of method of determination offset estimation for the embodiment of the present invention one, methods described bag
Include：
Step 101：Detect the preface information of current RACH RACH, and determined according to described preface information maximum
Path position information.
In this step 101, network side detects the preface information of current RACH RACH, leading by detect
The corresponding sequence of information and locally stored synchronizing sequence carry out related operation, obtain the channel response sequence of the multipath after computing
Row, wherein, in the channel response sequence after computing, each channel response sequence value corresponds to the position in a channel response sequence respectively
Confidence ceases, using the positional information corresponding to the channel response sequence value of maximum absolute value in channel response sequence as current RACH
Maximum diameter positional information.
When determining the maximum diameter positional information of RACH, in addition to using maximum value process, mean value method can also be adopted, that is,
Carry out addition using channel response sequence value each in the channel response sequence after computing to average, the meansigma methodss obtaining are corresponded to
Channel response sequence in positional information as current RACH maximum diameter positional information.
Step 102：On the corresponding position of maximum diameter positional information determining, the preface information receiving described RACH corresponds to
Present frame information.
Wherein, comprise control information data information in described present frame information.
In a step 102, first, according to the maximum diameter positional information determining in step 101, obtain described maximum path position
The corresponding position of information；
Secondly, from the corresponding position of described maximum diameter positional information, receive the corresponding bag of preface information of described RACH
Present frame information containing control information.
Step 103：Offset estimation is carried out to the control information comprising in described present frame information, obtains present frame and disappear
The offset estimation value of breath information.
In step 103, by the following method frequency deviation is carried out to the control information comprising in described present frame information
Estimate, obtain the offset estimation value of present frame information：
The first step：Decomposite the control information in present frame information.
Specifically, when receiving present frame information, the described information receiving is carried out at descrambling and de-spreading
Reason, present frame information is decomposed and obtains control information data information.
Second step：Enter row operation using the corresponding sequence of the control information decompositing and locally stored pilot frequency sequence, obtain
To X (n).
Specifically, first, corresponding for described control information sequence and locally stored pilot frequency sequence are carried out point multiplication operation,
The operation result obtaining is designated as x (n)；
When carrying out point multiplication operation, non-pilot information zero setting, because the length of pilot frequency information is 8 bits in each time slot,
The length of non-pilot information is 2 bits, and the impact to computing for the non-pilot information is less.
Secondly, the x (n) obtaining is carried out FFT（Fast Fourier Transformation, discrete fourier transform fast
The short-cut counting method）After integral transformation, obtain X (n).
3rd step：Determine the offset estimation value of present frame information using X (n).
Specifically, it is determined that parameter K that the satisfaction in X (n) imposes a condition0And K0+ r, and utilize described parameter K0And K0+ r counts
Calculation obtains the first offset estimation valueWherein：
Δ f represents frequency values, and Δ F represents frequency resolution, as X (K0+ 1) ＜ X (K0- 1) when, r=-1；As X (K0+1)≥
X(K0- 1) when, r=1.
Described satisfaction imposes a condition the condition referring to determine according to actual needs, can be in X (n) corresponding peak value and time
Peak value；Can also be corresponding other values in X (n)；
More preferably, using the offset estimation value method that X (n) determines present frame information it is：First, determine the peak of X (n)
The parameter information of value position, this parameter information is designated as K0；
Secondly, determine the parameter information of the minor peaks position of X (n), and this parameter information is designated as K0+ r, wherein：As X (K0
+ 1) ＜ X (K0- 1) when, r=-1；As X (K0+1)≥X(K0- 1) when, r=1,；
Finally, according to formulaCalculate offset estimation value, wherein Δ f
Represent frequency deviation value, Δ F represents frequency resolution.
It should be noted that the method that the control information in information in using RACH carries out offset estimation not only may be used
So that using above-mentioned Rife frequency excursion algorithm, other algorithms of the prior art can also be adopted, not limit here.
More preferably, after the offset estimation value obtaining present frame information, methods described also includes：Worked as using described
The offset estimation value of previous frame information carries out frequency deviation compensation to the data message comprising in present frame information.
Specifically, in the following manner frequency deviation compensation is carried out to described data message, specifically include：
By described data message and exp（-j2πΔft）Amass, the result that computing obtains is as new data message.
By the scheme of embodiment one, maximum diameter positional information is determined according to the preface information of current RACH；
Receive the present frame information of current RACH in the corresponding position of maximum diameter positional information determining；Using described
Control information in present frame information carries out offset estimation, obtains offset estimation value, due to using current Stochastic accessing letter
The offset estimation that control information in the information in road is carried out, be this avoid and entered using the preface information of RACH
After row offset estimation, the frequency deviation of channel is undergone mutation so that calculated offset estimation value can not meet is actually needed, practical
Property the problem that reduces, increased the practicality of offset estimation value, simplified operation, decrease hard in the case of ensureing operational precision
The consumption of part resource.
Embodiment two：
As shown in figure 4, the schematic flow sheet of a kind of method of determination offset estimation for the present embodiment two.The present invention is implemented
Example two is the detailed description of each step of the embodiment of the present invention one, and methods described includes：
Step 201：Detect the preface information of current RACH RACH, and determined according to described preface information maximum
Path position information.
Step 202：On the corresponding position of maximum diameter positional information determining, the preface information receiving described RACH corresponds to
Present frame information.
Step 203：Offset estimation is carried out to the control information comprising in described present frame information, obtains present frame and disappear
The offset estimation value of breath information.
Step 204：Using described present frame information offset estimation value to the number comprising in present frame information
It is believed that breath carries out frequency deviation compensation.
Step 205：Determine the retarding power matrix of the present frame information of current RACH.
Wherein, phase is done according to the data that known RACH message control information is declined after adopting with the different delayed time situation receiving
Close computing and obtain retarding power matrix.
Specifically, first, by the data of collection in the case of known RACH message control information and the different delayed time receiving
Carry out coherent accumulation, cumulative length is 1 time slot；Secondly, known RACH message control information is not co-extensive with receive
When in the case of the data of collection carry out noncoherent accumulation, cumulative length is 1 frame.Assume that search length is 64, considering to adopt
In the case of multiple, the retarding power matrix size finally calculating is 1*64.
Because the purpose of coherent accumulation and noncoherent accumulation is to reduce effect of noise, the therefore time-varying based on channel is special
Property, the length of coherent accumulation can not be long, in order to avoid making the energy value of estimation diminish.
Step 206：Described power matrix is entered with row operation, and using operation result as new maximum diameter positional information.
Specifically, when in local RACH message control information with the data receiving, control information is synchronous, retarding power square
Battle array occurs peak value, and corresponding for peak value positional information is now defined as the positional information of the maximum diameter of current RACH channel.
Step 207：On the described new corresponding position of maximum diameter positional information, receive the preface information pair of described RACH
The the second frame message information answered.
Step 208：Offset estimation is carried out to the control information comprising in described second frame message information, obtains the second frame and disappear
The offset estimation value of breath information.
Specifically, the step obtaining the offset estimation value of the second frame message information includes：
The first step：Decomposite the control information in the second frame message information.
Specifically, when receiving the second frame message information, the described second frame message information receiving is descrambled
Despreading is processed, and the second frame message information decomposition is obtained control information data information.
Second step：Enter row operation using the corresponding sequence of the control information decompositing and locally stored pilot frequency sequence, obtain
To X (n).
Specifically, first, corresponding for described control information sequence and locally stored pilot frequency sequence are carried out point multiplication operation,
The operation result obtaining is designated as x (n)；
Secondly, the x (n) obtaining is carried out, after FFT integral transformation, obtaining X (n).
3rd step：Determine parameter K that the satisfaction in X (n) imposes a condition0And K0+ r, and utilize described parameter K0And K0+ r counts
Calculation obtains the second offset estimation valueWherein：
Δ f represents frequency values, and Δ F represents frequency resolution, as X (K0+ 1) ＜ X (K0- 1) when, r=-1；As X (K0+1)≥
X(K0- 1) when, r=1.
Step 209：Using described second frame message information offset estimation value to the number comprising in the second frame message information
It is believed that breath carries out frequency deviation compensation, and current RACH message is demodulated decode.
Specifically, in the following manner frequency deviation compensation is carried out to described data message, specifically include：
By described data message and exp（-j2πΔft）Amass, the result that computing obtains is as new data message.
By the scheme of the embodiment of the present invention two, maximum diameter positional information is determined by the preface information of RACH, and
Obtain the information of RACH at the big corresponding position of path position information, entered using the control information in the information in RACH
Row offset estimation, and in real time frequency deviation compensation is carried out to described RACH using obtaining offset estimation value, before additionally not increasing RACH
Lead the Detection task of information, because the control information length in RACH information is much larger than the preface information length of RACH, lead to
Cross the control information in RACH information to carry out the offset estimation value that offset estimation obtains and more can meet being actually needed, practicality
Strengthen；Although this programme can also be compared and prior art using the operation method of offset estimation twice, complexity reduces, with
When reduce communication delay and save the computing resource of system.
Embodiment three：
As shown in figure 5, a kind of structural representation of the equipment of determination offset estimation for the present embodiment three.Described equipment bag
Include：Determine location information module 11, the first receiver module 12 and the first offset estimation value computing module 13, wherein：
Determine location information module 11, for detecting the preface information of current RACH, and according to described leading
Information determines maximum diameter positional information；
First receiver module 12, for corresponding in the described maximum diameter positional information determining that location information module 11 determines
On position, receive described preface information corresponding present frame information；
First offset estimation value computing module 13, for the present frame information that described first receiver module 12 is received
In the control information that comprises carry out offset estimation, obtain the offset estimation value of present frame information.
Specifically, described first offset estimation value computing module 13, specifically for by the following method to described present frame
The control information comprising in information carries out offset estimation, obtains the offset estimation value of present frame information：
Decomposite the control information in present frame information；
Enter row operation using the corresponding sequence of the control information decompositing and locally stored pilot frequency sequence, obtain X (n)；
Determine parameter K that the satisfaction in X (n) imposes a condition0And K0+ r, and utilize described parameter K0And K0+ r is calculated
Offset estimation value Wherein：
Δ f represents frequency, and Δ F represents frequency resolution, as X (K0+ 1) ＜ X (K0- 1) when, r=-1；As X (K0+1)≥X
(K0- 1) when, r=1.
Data message is comprised in described present frame information；
Described equipment also includes：First frequency offset compensation block 14, wherein：
First frequency offset compensation block 14, for after the offset estimation value obtaining present frame information, using described
Offset estimation value carries out frequency deviation compensation to the data message comprising in present frame information.
Specifically, described first frequency offset compensation block 14, specifically in the following manner in present frame information
The data message comprising carries out frequency deviation compensation, specifically includes：
By the data message comprising in present frame information and exp（-j2πΔft）Amass, the result obtaining is as frequency
Data message after offset compensation.
Described equipment also includes：Retarding power matrix deciding module 15, updating location information module 16, the second receiver module
17th, the second offset estimation value computing module 18 and the second frequency offset compensation block 19, wherein：
Retarding power matrix deciding module 15, for determining the retarding power square of the present frame information of current RACH
Battle array；
Updating location information module 16, the power matrix for determining to described retarding power matrix deciding module 15 is carried out
Computing, and using operation result as new maximum diameter positional information；
Second receiver module 17, for the new maximum diameter positional information pair determining in described updating location information module 16
On the position answered, receive the corresponding second frame message information of preface information of described RACH；
Second offset estimation value computing module 18, for the second frame message information that described second receiver module 17 is received
In the control information that comprises carry out offset estimation, obtain the offset estimation value of the second frame message information.
Second frequency offset compensation block 19, for after obtaining the offset estimation value of the second frame message information, using described
The offset estimation value of the second frame message information carries out frequency deviation compensation to the data message comprising in the second frame message information.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprise these changes and modification.
Claims (8)
1. a kind of method determining offset estimation value is it is characterised in that methods described includes：
Detect the preface information of current RACH RACH, and maximum diameter positional information is determined according to described preface information；
On the corresponding position of maximum diameter positional information determining, receive the corresponding current frame message of preface information of described RACH
Information；
Offset estimation is carried out to the control information comprising in described present frame information, obtains the frequency deviation of present frame information
Estimated value, specifically, carries out offset estimation to the control information comprising in described present frame information by the following method, obtains
Offset estimation value to present frame information：
Decomposite the control information comprising in present frame information；
Enter row operation using the corresponding sequence of the control information decompositing and locally stored pilot frequency sequence, obtain X (n)；
Determine parameter K that the satisfaction in X (n) imposes a condition0And K0+ r, and utilize described parameter K0And K0+ r is calculated the first frequency
Estimated value partiallyWherein：
Δ f represents frequency values, and Δ F represents frequency resolution, as X (K0+ 1) ＜ X (K0- 1) when, r=-1；As X (K0+1)≥X(K0-
1) when, r=1.
2. the method for claim 1 is it is characterised in that also comprise data message in described present frame information；
After obtaining the offset estimation value of present frame information, methods described also includes：
Using described offset estimation value, frequency deviation compensation is carried out to described data message.
3. method as claimed in claim 2 is it is characterised in that in the following manner to the number comprising in present frame information
It is believed that breath carries out frequency deviation compensation, specifically include：
The data message comprising in present frame information is amassed with exp (- j2 π Δ ft), the result that computing obtains is as new
Data message.
4. the method for claim 1 is it is characterised in that the information of described RACH also includes the second frame message letter
Breath；
After obtaining the offset estimation value of present frame information, methods described also includes：
Determine the retarding power matrix of the present frame information of current RACH；
Described power matrix is entered with row operation, and using operation result as new maximum diameter positional information；
On the described new corresponding position of maximum diameter positional information, corresponding second frame of preface information receiving described RACH disappears
Breath information；
Offset estimation is carried out to the control information comprising in described second frame message information, obtains the frequency deviation of the second frame message information
Estimated value；
Offset estimation value using described second frame message information enters line frequency to the data message comprising in the second frame message information
Offset compensation.
5. a kind of equipment determining offset estimation value is it is characterised in that described equipment includes：
Determine location information module, for detecting the preface information of current RACH RACH, and according to described leading letter
Breath determines maximum diameter positional information；
First receiver module, for the corresponding position of maximum diameter positional information determining in described determination location information module,
Receive the preface information corresponding present frame information of described RACH；
First offset estimation value computing module, for comprise in the present frame information to described first receiver module reception
Control information carries out offset estimation, obtains the offset estimation value of present frame information；
Described first offset estimation value computing module, specifically for comprising in described present frame information by the following method
Control information carry out offset estimation, obtain the offset estimation value of present frame information：
Decomposite the control information comprising in present frame information；
Enter row operation using the corresponding sequence of the control information decompositing and locally stored pilot frequency sequence, obtain X (n)；
Determine parameter K that the satisfaction in X (n) imposes a condition0And K0+ r, and utilize described parameter K0And K0+ r is calculated present frame
The offset estimation value of informationWherein：
Δ f represents frequency, and Δ F represents frequency resolution, as X (K0+ 1) ＜ X (K0- 1) when, r=-1；As X (K0+1)≥X(K0-1)
When, r=1.
6. equipment as claimed in claim 5 is it is characterised in that also comprise data message in described present frame information；
Described equipment also includes：
First frequency offset compensation block, for after the offset estimation value obtaining current frame message, using described offset estimation value
Frequency deviation compensation is carried out to described data message.
7. equipment as claimed in claim 6 it is characterised in that
Described first frequency offset compensation block, specifically in the following manner to the data message comprising in present frame information
Carry out frequency deviation compensation, specifically include：
The data message comprising in present frame information is amassed with exp (- j2 π Δ ft), the result obtaining is mended as frequency deviation
Data message after repaying.
8. equipment as claimed in claim 5 is it is characterised in that described equipment also includes：
Retarding power matrix deciding module, for determining the retarding power matrix of the present frame information of current RACH；
Updating location information module, the power matrix for determining to described retarding power matrix deciding module enters row operation, and
Using operation result as new maximum diameter positional information；
Second receiver module, for the new corresponding position of maximum diameter positional information determining in described updating location information module
On, receive the corresponding second frame message information comprising control information of preface information of described RACH；
Second offset estimation value computing module, for comprise in the second frame message information to described second receiver module reception
Control information carries out offset estimation, obtains the offset estimation value of the second frame message information；
Second frequency offset compensation block, for after obtaining the offset estimation value of the second frame message information, using described second frame
The offset estimation value of information carries out frequency deviation compensation to the data message comprising in the second frame message information.
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| CN104780126B (en) * | 2014-01-14 | 2018-09-21 | 华为技术有限公司 | A kind of method and device for eliminating frequency deviation kick |
| CN107211458B (en) | 2015-02-06 | 2021-01-29 | 瑞典爱立信有限公司 | Method and apparatus for random access preamble detection |
| CN107396454B (en) * | 2016-05-16 | 2022-11-01 | 中兴通讯股份有限公司 | Random access method, device and system |
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| CN1756411A (en) * | 2004-09-29 | 2006-04-05 | 中兴通讯股份有限公司 | WCDMA system access channel frequency deviation estimating method |
| CN101478328A (en) * | 2008-12-31 | 2009-07-08 | 中兴通讯股份有限公司 | Method and apparatus for frequency bias estimation and compensation |
| CN101808061A (en) * | 2010-03-12 | 2010-08-18 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
| WO2012092900A2 (en) * | 2012-02-13 | 2012-07-12 | 华为技术有限公司 | Channel frequency offset estimation method, device and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1756411A (en) * | 2004-09-29 | 2006-04-05 | 中兴通讯股份有限公司 | WCDMA system access channel frequency deviation estimating method |
| CN101478328A (en) * | 2008-12-31 | 2009-07-08 | 中兴通讯股份有限公司 | Method and apparatus for frequency bias estimation and compensation |
| CN101808061A (en) * | 2010-03-12 | 2010-08-18 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
| WO2012092900A2 (en) * | 2012-02-13 | 2012-07-12 | 华为技术有限公司 | Channel frequency offset estimation method, device and system |
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| LT E 上行链路高速铁路应用场景中的频偏估计方法;倪浩,任光亮,白云,常义林;《上海交通大学学报》;20100930;第44卷(第9期);全文 * |
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