CN103716896A - 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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- CN103716896A CN103716896A CN201210378006.3A CN201210378006A CN103716896A CN 103716896 A CN103716896 A CN 103716896A CN 201210378006 A CN201210378006 A CN 201210378006A CN 103716896 A CN103716896 A CN 103716896A
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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, relate in particular to the method and apparatus that a kind of frequency deviation is estimated and compensated.
Background technology
Wideband Code Division Multiple Access (WCDMA) (WCDMA) is as one of three kinds of main flow 3G standards in the world, the service of high-quality traditional voice service not only can be provided, the service of the multimedia service that is similar to fixed network can also be provided, before service is provided, determine that business Random Access Channel is a very important step.
Described Random Access Channel (Random Access Channel, RACH) be a kind of uplink transport channel, before starting to carry out, business needs first through RACH access, and communicate after setting up service link, while being mainly used in starting up of terminal registration access communications network, when rear network location information renewal is moved in position etc., for example: travelling carriage need to be set up communication with network side, need to network side, send a message by RACH, object is to signaling channel of network side application, network side decides the channel type into mobile assignment by the channel request of carrying according to RACH.
Wherein, RACH has comprised preface information and information, and wherein, preface information is repeated to form for 256 times by the effective signature sequence of 16 bit of selecting at random; The time interval TTI of information transmission can be 10ms(now, comprises a frame message information in RACH) or 20ms(is now, comprises two frame message information in RACH).As shown in Figure 1, for RACH preface information and information transmission schematic diagram, its operation principle is: terminal continues to send RACH preface information, until AICH(catches indication) on the response that is confirmed, start the transmission of RACH information, wherein, between the preface information of a RACH and the information of this RACH, have corresponding relation, while comprising a frame message information in RACH, the preface information of a RACH is to a frame message information that should RACH; While comprising two frame message information in RACH, the preface information of a RACH is to two frame message information that should RACH.
Yet under existing high ferro scene, mobile terminal is in motion at a high speed, and in the preface information of RACH and the process of information that base station sends at receiving terminal, the frequency of signal can change, and produces Doppler effect.Once yet there is Doppler effect, the frequency deviation producing can cause and have a strong impact on the demodulation of the information of RACH.For example: with reference to 3GPP tissue T S25.104 agreement (being R8), if the speed of train is 350 kilometers/hour, the maximum Doppler frequency offset that base station produces at the upward signal that receives terminal transmission can reach 1340Hz.As shown in Figure 2, the schematic diagram changing for high ferro scene lower channel frequency deviation, in Fig. 2, at a time, high ferro scene lower channel frequency deviation be changed to 1150Hz ~-1150Hz.
In order to solve the frequency deviation size of accurate location high ferro scene lower channel, there is in the prior art following several method:
First method: increase the Detection task of RACH preface information, utilize that RACH is leading carries out frequency deviation estimation, by the frequency deviation estimated value obtaining for the compensate of frequency deviation to RACH information.
Embodiment has two kinds:
1, adopt default frequency deviation value method.Concrete mode is: when terminal is prepared access network, by default n different compensate of frequency deviation value, carry out the leading demodulation of RACH, the leading amplitude while obtaining different compensate of frequency deviation; According to the n obtaining a leading amplitude, calculate the ratio of n-1 leading amplitude; Between the function that the ratio that utilization obtains, default frequency deviation are poor and one of them compensate of frequency deviation value, ask poor n-1 the frequency deviation difference that obtain; The frequency deviation difference obtaining is averaged and obtained frequency deviation estimated value, and utilize the frequency deviation estimated value obtaining to carry out compensate of frequency deviation to the information of RACH.
2, adopt the leading difference correlation method of RACH.Concrete mode is: first, utilize definite maximum diameter position to make descrambling and de-spreading to preface information and process; Secondly, the result obtaining is divided into some segments, each segment is carried out to coherent integration processing, calculate the estimated value that between adjacent result, phase angle rotates; Finally, according to phase difference and time difference, calculate frequency deviation estimated value, and utilize the frequency deviation estimated value obtaining to carry out compensate of frequency deviation to the information of RACH.
Adopt default frequency deviation value method, definite frequency deviation estimated value is relatively coarse, also additionally expends hardware resource; Adopt the leading difference correlation method of RACH, when carrying out coherent integration computing, the impact of noise is larger, definite frequency deviation estimated value accuracy is lower, simultaneously, when definite frequency deviation estimated value, do not consider channel frequency deviation this factor of undergoing mutation, therefore, utilize first kind of way to determine that the frequency deviation estimated value accuracy of RACH is lower, practicality is poor.
Second method: simultaneously RACH preface information and information are carried out to frequency deviation estimation.
Embodiment is: first, preface information is carried out to frequency deviation and estimate and take into account multipath and select; Secondly, according to the path position information of gained, RACH message control information is carried out to descrambling and de-spreading processing, and carry out frequency deviation pre-compensation; The 3rd, after related operation and irrelevant computing, remove some useless footpaths, residue footpath information is carried out to frequency deviation estimation and compensation.Although this mode has fully utilized RACH preface information and information, and carried out twice selection, twice frequency deviation estimation, computing is complicated, carries out having little significance of multipath computing, causes the waste of hardware resource.
In sum, there is in the prior art frequency deviation estimated value poor accuracy and the not high problem of practicality of definite RACH.
Summary of the invention
The embodiment of the present invention provides the method and apparatus of a kind of definite frequency deviation estimation and compensation, has frequency deviation estimated value poor accuracy and the not high problem of practicality of definite RACH for solving prior art.
The method that definite frequency deviation is estimated, described method comprises:
Detect the preface information of current Random Access Channel RACH, and determine maximum diameter positional information according to described preface information;
On position corresponding to definite maximum diameter positional information, receive present frame information corresponding to preface information of described RACH;
The control information comprising in described present frame information is carried out to frequency deviation estimation, obtain the frequency deviation estimated value of present frame information.
The equipment that definite frequency deviation is estimated, described equipment comprises:
Determine positional information module, for detection of the preface information of current Random Access Channel RACH, and determine maximum diameter positional information according to described preface information;
The first receiver module, in definite position corresponding to maximum diameter positional information of described definite positional information module, receives present frame information corresponding to preface information of described RACH;
The first frequency deviation estimated value computing module, frequency deviation estimation is carried out in the control information comprising for the present frame information that described the first receiver module is received, and obtains the frequency deviation estimated value of present frame information.
Beneficial effect of the present invention is as follows:
The embodiment of the present invention is to utilize the frequency deviation that the control information in the information of current Random Access Channel is carried out to estimate, avoided like this utilizing the preface information of Random Access Channel to carry out after frequency deviation estimation, the frequency deviation of channel is undergone mutation, the frequency deviation estimated value that makes to calculate can not meet the needs of information corresponding to preface information, the problem that practicality reduces, increased the practicality of frequency deviation estimated value, simplified operation has reduced the consumption of hardware resource in the situation that guaranteeing operational precision.
Accompanying drawing explanation
Fig. 1 is RACH preface information and information transmission schematic diagram;
Fig. 2 is the schematic diagram that high ferro scene lower channel frequency deviation changes;
Fig. 3 is the flow chart of the method estimated of a kind of definite frequency deviation of the embodiment of the present invention one;
Fig. 4 is the flow chart of the method estimated of a kind of definite frequency deviation of the embodiment of the present invention two;
Fig. 5 is the structural representation of the equipment estimated of a kind of definite frequency deviation of the embodiment of the present invention three.
Embodiment
In order to realize object of the present invention, the method and apparatus that the embodiment of the present invention provides a kind of frequency deviation to estimate and compensate, according to the preface information of the current Random Access Channel detecting, determine maximum diameter positional information, on position corresponding to definite maximum diameter positional information, receive present frame information corresponding to preface information of described RACH, and the control information comprising in described present frame information is carried out to frequency deviation estimation, obtain the frequency deviation estimated value of present frame information.
Compared with prior art, because the frequency deviation that the control information utilizing in the present frame information of current Random Access Channel is carried out is estimated, avoided like this utilizing the preface information of Random Access Channel to carry out after frequency deviation estimation, the frequency deviation of channel is undergone mutation, the frequency deviation estimated value that makes to calculate can not meet the needs of information corresponding to preface information, the problem that practicality reduces, increased the practicality of frequency deviation estimated value, simplified operation has reduced the consumption of hardware resource in the situation that guaranteeing operational precision.
Below in conjunction with Figure of description, the embodiment of the present invention is described in detail.
Embodiment mono-:
As shown in Figure 3, the flow chart of the method for estimating for a kind of definite frequency deviation of the embodiment of the present invention one, described method comprises:
Step 101: detect the preface information of current Random Access Channel RACH, and determine maximum diameter positional information according to described preface information.
In this step 101, network side detects the preface information of current Random Access Channel RACH, the sequence that the preface information detecting is corresponding is carried out to related operation with the synchronizing sequence of local storage, obtain the channel response sequence of the multipath after computing, wherein, positional information in channel response sequence after computing in the respectively corresponding channel response sequence of each channel response sequence value, the maximum diameter positional information using the corresponding positional information of channel response sequence value of absolute value maximum in channel response sequence as current RACH.
When determining the maximum diameter positional information of RACH, except adopting maximum value process, can also adopt mean value method, utilize in the channel response sequence after computing each channel response sequence value to be added and average, the maximum diameter positional information using the positional information in channel response sequence corresponding to the mean value obtaining as current RACH.
Step 102: on position corresponding to definite maximum diameter positional information, receive present frame information corresponding to preface information of described RACH.
Wherein, in described present frame information, comprise control information and data message.
In step 102, first, according to maximum diameter positional information definite in step 101, obtain position corresponding to described maximum diameter positional information;
Secondly, from position corresponding to described maximum diameter positional information, receive the present frame information that comprises control information corresponding to preface information of described RACH.
Step 103: the control information comprising in described present frame information is carried out to frequency deviation estimation, obtain the frequency deviation estimated value of present frame information.
In step 103, by the following method the control information comprising in described present frame information is carried out to frequency deviation estimation, obtain the frequency deviation estimated value of present frame information:
The first step: decomposite the control information in present frame information.
Particularly, when receiving present frame information, the described information receiving is carried out to descrambling and de-spreading processing, present frame information is decomposed to controlled information and data message.
Second step: utilize sequence corresponding to control information decompositing to carry out computing with the pilot frequency sequence of local storage, obtain X (n).
Particularly, first, the sequence that described control information is corresponding is carried out to point multiplication operation with the pilot frequency sequence of local storage, the operation result obtaining is designated as x (n);
When carrying out point multiplication operation, non-pilot frequency information zero setting, because the length of pilot frequency information is 8 bits in each time slot, the length of non-pilot frequency information is 2 bits, non-pilot frequency information is less on the impact of computing.
Secondly, the x obtaining (n) is carried out to FFT(Fast Fourier Transformation, the fast algorithm of discrete fourier transform) after integral transformation, obtain X (n).
The 3rd step: utilize X (n) to determine the frequency deviation estimated value of present frame information.
Particularly, determine the satisfied parameter K imposing a condition in X (n)
0and K
0+ r, and utilize described parameter K
0and K
0+ r calculates the first frequency deviation estimated value
wherein:
Δ f represents frequency values, and Δ F represents frequency resolution, as X (K
0+ 1) < X (K
0-1) time, r=-1; As X (K
0+ 1)>=X (K
0-1) time, r=1.
Described satisfied imposing a condition refers to definite according to actual needs condition, can be peak value and minor peaks corresponding in X (n); Also can be other values corresponding in X (n);
More preferably, utilize X (n) to determine that the frequency deviation estimated value method of present frame information is: first, to determine the parameter information of the peak of X (n), this parameter information is designated as to K
0;
Secondly, determine the parameter information of the minor peaks position of X (n), and this parameter information is designated as to K
0+ r, wherein: as X (K
0+ 1) < X (K
0-1) time, r=-1; As X (K
0+ 1)>=X (K
0-1) time, r=1;
Finally, according to formula
calculate frequency deviation estimated value, wherein Δ f represents frequency deviation value, and Δ F represents frequency resolution.
It should be noted that, the method that frequency deviation estimation is carried out in the control information in utilizing RACH in information not only can adopt above-mentioned Rife frequency deviation algorithm for estimating, can also adopt other algorithms of the prior art, does not limit here.
More preferably, after obtaining the frequency deviation estimated value of present frame information, described method also comprises: utilize the frequency deviation estimated value of described present frame information to carry out compensate of frequency deviation to the data message comprising in present frame information.
Particularly, in the following manner described data message is carried out to compensate of frequency deviation, specifically comprises:
By described data message and exp(-j2 π Δ ft) to amass, the result that computing obtains is as new data message.
By the scheme of embodiment mono-, according to the preface information of current Random Access Channel, determine maximum diameter positional information; In position corresponding to definite maximum diameter positional information, receive the present frame information of current Random Access Channel; Utilize the control information in described present frame information to carry out frequency deviation estimation, obtain frequency deviation estimated value, because the frequency deviation that the control information utilizing in the information of current Random Access Channel is carried out is estimated, avoided like this utilizing the preface information of Random Access Channel to carry out after frequency deviation estimation, the frequency deviation of channel is undergone mutation, make the frequency deviation estimated value calculating can not meet actual needs, the problem that practicality reduces, increased the practicality of frequency deviation estimated value, simplified operation has reduced the consumption of hardware resource in the situation that guaranteeing operational precision.
Embodiment bis-:
The schematic flow sheet of the method for estimating for a kind of definite frequency deviation of the present embodiment two as shown in Figure 4.The embodiment of the present invention two is detailed descriptions of each step of the embodiment of the present invention one, and described method comprises:
Step 201: detect the preface information of current Random Access Channel RACH, and determine maximum diameter positional information according to described preface information.
Step 202: on position corresponding to definite maximum diameter positional information, receive present frame information corresponding to preface information of described RACH.
Step 203: the control information comprising in described present frame information is carried out to frequency deviation estimation, obtain the frequency deviation estimated value of present frame information.
Step 204: utilize the frequency deviation estimated value of described present frame information to carry out compensate of frequency deviation to the data message comprising in present frame information.
Step 205: the retarding power matrix of determining the present frame information of current Random Access Channel.
Wherein, the data that decline after adopting according to known RACH message control information and the different delayed time situation of receiving carry out related calculation and obtain retarding power matrix.
Particularly, first, the data that gather in known RACH message control information and the different delayed time situation received are carried out to coherent accumulation, cumulative length is 1 time slot; Secondly, the data that gather in known RACH message control information and the different delayed time situation of receiving are carried out to noncoherent accumulation, cumulative length is 1 frame.Suppose that search length is 64, in the situation that considering to adopt multiple, the retarding power matrix size finally calculating is 1*64.
Because the object of coherent accumulation and noncoherent accumulation is to reduce the impact of noise, therefore time-varying characteristics based on channel, the length of coherent accumulation can not be long, in order to avoid the energy value of estimating is diminished.
Step 206: described power matrix is carried out to computing, and using operation result as new maximum diameter positional information.
Particularly, when local RACH message control information is synchronizeed with control information in the data of receiving, retarding power matrix there will be peak value, now positional information corresponding to peak value is defined as to the positional information of the maximum diameter of current RACH channel.
Step 207: on position corresponding to described new maximum diameter positional information, receive the second frame message information corresponding to preface information of described RACH.
Step 208: the control information comprising in described the second frame message information is carried out to frequency deviation estimation, obtain the frequency deviation estimated value of the second frame message information.
Particularly, the step that obtains the frequency deviation estimated value of the second frame message information comprises:
The first step: decomposite the control information in the second frame message information.
Particularly, when receiving the second frame message information, described the second frame message information receiving is carried out to descrambling and de-spreading processing, by the controlled information of the second frame message information decomposition and data message.
Second step: utilize sequence corresponding to control information decompositing to carry out computing with the pilot frequency sequence of local storage, obtain X (n).
Particularly, first, the sequence that described control information is corresponding is carried out to point multiplication operation with the pilot frequency sequence of local storage, the operation result obtaining is designated as x (n);
Secondly, the x obtaining (n) is carried out after FFT integral transformation, obtain X (n).
The 3rd step: determine the satisfied parameter K imposing a condition in X (n)
0and K
0+ r, and utilize described parameter K
0and K
0+ r calculates the second frequency deviation estimated value
wherein:
Δ f represents frequency values, and Δ F represents frequency resolution, as X (K
0+ 1) < X (K
0-1) time, r=-1; As X (K
0+ 1)>=X (K
0-1) time, r=1.
Step 209: utilize the frequency deviation estimated value of described the second frame message information to carry out compensate of frequency deviation to the data message comprising in the second frame message information, and current RACH message is carried out to demodulation coding.
Particularly, in the following manner described data message is carried out to compensate of frequency deviation, specifically comprises:
By described data message and exp(-j2 π Δ ft) to amass, the result that computing obtains is as new data message.
By the scheme of the embodiment of the present invention two, by the preface information of RACH, determine maximum diameter positional information, and in position corresponding to maximum diameter positional information, obtain the information of RACH, utilize the control information in the information in RACH to carry out frequency deviation estimation, and utilize and to obtain frequency deviation estimated value and in real time described RACH is carried out to compensate of frequency deviation, there is no additionally to increase the Detection task of RACH preface information, due to the preface information length of the control information length in RACH information much larger than RACH, by the control information in RACH information, carry out frequency deviation and estimate that the frequency deviation estimated value obtaining more can meet actual needs, practicality strengthens, although this programme also can adopt the operation method of twice frequency deviation estimation, compares and prior art, reduced complexity, reduces communication delay simultaneously and has saved the computational resource of system.
Embodiment tri-:
The structural representation of the equipment of estimating for a kind of definite frequency deviation of the present embodiment three as shown in Figure 5.Described equipment comprises: determine positional information module 11, the first receiver module 12 and the first frequency deviation estimated value computing module 13, wherein:
Determine positional information module 11, for detection of the preface information of current Random Access Channel, and determine maximum diameter positional information according to described preface information;
The first receiver module 12, in definite position corresponding to maximum diameter positional information of described definite positional information module 11, receives present frame information corresponding to described preface information;
The first frequency deviation estimated value computing module 13, frequency deviation estimation is carried out in the control information comprising for the present frame information that described the first receiver module 12 is received, and obtains the frequency deviation estimated value of present frame information.
Particularly, described the first frequency deviation estimated value computing module 13, specifically for by the following method the control information comprising in described present frame information being carried out to frequency deviation estimation, obtains the frequency deviation estimated value of present frame information:
Decomposite the control information in present frame information;
Sequence corresponding to control information that utilization decomposites carried out computing with the pilot frequency sequence of local storage, obtains X (n);
Determine the satisfied parameter K imposing a condition in X (n)
0and K
0+ r, and utilize described parameter K
0and K
0+ r calculates frequency deviation estimated value
Wherein:
Δ f represents frequency, and Δ F represents frequency resolution, as X (K
0+ 1) < X (K
0-1) time, r=-1; As X (K
0+ 1)>=X (K
0-1) time, r=1.
In described present frame information, comprise data message;
Described equipment also comprises: the first compensate of frequency deviation module 14, wherein:
The first compensate of frequency deviation module 14, for after obtaining the frequency deviation estimated value of present frame information, utilizes described frequency deviation estimated value to carry out compensate of frequency deviation to the data message comprising in present frame information.
Particularly, described the first compensate of frequency deviation module 14, specifically in the following manner the data message comprising in present frame information being carried out to compensate of frequency deviation, specifically comprises:
By the data message comprising in present frame information and exp(-j2 π Δ ft) amass the data message of the result obtaining after as compensate of frequency deviation.
Described equipment also comprises: retarding power matrix determination module 15, updating location information module 16, the second receiver module 17, the second frequency deviation estimated value computing module 18 and the second compensate of frequency deviation module 19, wherein:
Retarding power matrix determination module 15, for determining the retarding power matrix of the present frame information of current RACH;
Updating location information module 16, for the definite power matrix of described retarding power matrix determination module 15 is carried out to computing, and using operation result as new maximum diameter positional information;
The second receiver module 17, for new position corresponding to maximum diameter positional information of determining in described updating location information module 16, receives the second frame message information corresponding to preface information of described RACH;
The second frequency deviation estimated value computing module 18, frequency deviation estimation is carried out in the control information comprising for the second frame message information that described the second receiver module 17 is received, and obtains the frequency deviation estimated value of the second frame message information.
The second compensate of frequency deviation module 19, for after obtaining the frequency deviation estimated value of the second frame message information, utilizes the frequency deviation estimated value of described the second frame message information to carry out compensate of frequency deviation to the data message comprising in the second frame message information.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. a method for definite frequency deviation estimated value, is characterized in that, described method comprises:
Detect the preface information of current Random Access Channel RACH, and determine maximum diameter positional information according to described preface information;
On position corresponding to definite maximum diameter positional information, receive present frame information corresponding to preface information of described RACH;
The control information comprising in described present frame information is carried out to frequency deviation estimation, obtain the frequency deviation estimated value of present frame information.
2. the method for claim 1, is characterized in that, by the following method the control information comprising in described present frame information is carried out to frequency deviation estimation, obtains the frequency deviation estimated value of present frame information:
Decomposite the control information comprising in present frame information;
Sequence corresponding to control information that utilization decomposites carried out computing with the pilot frequency sequence of local storage, obtains X (n);
Determine the satisfied parameter K imposing a condition in X (n)
0and K
0+ r, and utilize described parameter K
0and K
0+ r calculates the first frequency deviation estimated value
Wherein:
Δ f represents frequency values, and Δ F represents frequency resolution, as X (K
0+ 1) < X (K
0-1) time, r=-1; As X (K
0+ 1)>=X (K
0-1) time, r=1.
3. method as claimed in claim 1 or 2, is characterized in that, in described present frame information, also comprises data message;
After obtaining the frequency deviation estimated value of present frame information, described method also comprises:
Utilize described frequency deviation estimated value to carry out compensate of frequency deviation to described data message.
4. method as claimed in claim 3, is characterized in that, in the following manner the data message comprising in present frame information is carried out to compensate of frequency deviation, specifically comprises:
By the data message comprising in present frame information and exp(-j2 π Δ ft) to amass, the result that computing obtains is as new data message.
5. method as claimed in claim 1 or 2, is characterized in that, the information of described RACH also comprises the second frame message information;
After obtaining the frequency deviation estimated value of present frame information, described method also comprises:
Determine the retarding power matrix of the present frame information of current RACH;
Described power matrix is carried out to computing, and using operation result as new maximum diameter positional information;
On position corresponding to described new maximum diameter positional information, receive the second frame message information corresponding to preface information of described RACH;
The control information comprising in described the second frame message information is carried out to frequency deviation estimation, obtain the frequency deviation estimated value of the second frame message information;
Utilize the frequency deviation estimated value of described the second frame message information to carry out compensate of frequency deviation to the data message comprising in the second frame message information.
6. an equipment for definite frequency deviation estimated value, is characterized in that, described equipment comprises:
Determine positional information module, for detection of the preface information of current Random Access Channel RACH, and determine maximum diameter positional information according to described preface information;
The first receiver module, in definite position corresponding to maximum diameter positional information of described definite positional information module, receives present frame information corresponding to preface information of described RACH;
The first frequency deviation estimated value computing module, frequency deviation estimation is carried out in the control information comprising for the present frame information that described the first receiver module is received, and obtains the frequency deviation estimated value of present frame information.
7. equipment as claimed in claim 6, is characterized in that,
Described the first frequency deviation estimated value computing module, specifically for by the following method the control information comprising in described present frame information being carried out to frequency deviation estimation, obtains the frequency deviation estimated value of present frame information:
Decomposite the control information comprising in present frame information;
Sequence corresponding to control information that utilization decomposites carried out computing with the pilot frequency sequence of local storage, obtains X (n);
Determine the satisfied parameter K imposing a condition in X (n)
0and K
0+ r, and utilize described parameter K
0and K
0+ r calculates the frequency deviation estimated value of present frame information
wherein: Δ f represents frequency, Δ F represents frequency resolution, as X (K
0+ 1) < X (K
0-1) time, r=-1; As X (K
0+ 1)>=X (K
0-1) time, r=1.
8. the equipment as described in claim 6 or 7, is characterized in that, in described present frame information, also comprises data message;
Described equipment also comprises:
The first compensate of frequency deviation module, for after obtaining the frequency deviation estimated value of present frame message, utilizes described frequency deviation estimated value to carry out compensate of frequency deviation to described data message.
9. equipment as claimed in claim 8, is characterized in that,
Described the first compensate of frequency deviation module, specifically in the following manner the data message comprising in present frame information being carried out to compensate of frequency deviation, specifically comprises:
By the data message comprising in present frame information and exp(-j2 π Δ ft) amass the data message of the result obtaining after as compensate of frequency deviation.
10. the equipment as described in claim 6 or 7, is characterized in that, described equipment also comprises:
Retarding power matrix determination module, for determining the retarding power matrix of the present frame information of current RACH;
Updating location information module, for the definite power matrix of described retarding power matrix determination module is carried out to computing, and using operation result as new maximum diameter positional information;
The second receiver module, for new position corresponding to maximum diameter positional information of determining in described updating location information module, receives the second frame message information that comprises control information corresponding to preface information of described RACH;
The second frequency deviation estimated value computing module, frequency deviation estimation is carried out in the control information comprising for the second frame message information that described the second receiver module is received, and obtains the frequency deviation estimated value of the second frame message information;
The second compensate of frequency deviation module, for after obtaining the frequency deviation estimated value of the second frame message information, utilizes the frequency deviation estimated value of described the second frame message information to carry out compensate of frequency deviation to the data message comprising in the second frame message information.
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| CN104780126A (en) * | 2014-01-14 | 2015-07-15 | 华为技术有限公司 | Method and device for eliminating frequency offset jump |
| WO2016123790A1 (en) * | 2015-02-06 | 2016-08-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for random access preamble detection |
| CN107396454A (en) * | 2016-05-16 | 2017-11-24 | 中兴通讯股份有限公司 | A kind of accidental access method, apparatus and system |
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| CN104780126A (en) * | 2014-01-14 | 2015-07-15 | 华为技术有限公司 | Method and device for eliminating frequency offset jump |
| 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 |
| WO2016123790A1 (en) * | 2015-02-06 | 2016-08-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for random access preamble detection |
| US10420149B2 (en) | 2015-02-06 | 2019-09-17 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for random access preamble detection |
| CN107396454A (en) * | 2016-05-16 | 2017-11-24 | 中兴通讯股份有限公司 | A kind of accidental access method, apparatus and system |
| 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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| CN103716896B (en) | 2017-02-08 |
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