CN108282422A - A kind of orthogonal frequency division multiplexing (OFDM) system channel estimation method and terminal - Google Patents
A kind of orthogonal frequency division multiplexing (OFDM) system channel estimation method and terminal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
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Abstract
The present invention provides a kind of orthogonal frequency division multiplexing (OFDM) system channel estimation method and terminals, by obtaining the pilot signal for carrying out channel estimation, and are handled the pilot signal to obtain the channel estimation value of N number of subcarrier；The channel estimation value of edges at two ends subcarrier is selected from the channel estimation value of obtained N number of subcarrier, and the channel estimation value of credible subcarrier is selected from remaining channel estimation value.Processing is reconstructed to obtain the reconstruct channel estimation value of each edge subcarrier to the channel estimation value of each edge subcarrier in the channel estimation value of credible subcarrier based on selection, and the channel estimation value of each edge subcarrier is replaced with corresponding reconstruct channel estimation value.The reconstruct of the edge sub-carrier channels estimated value larger to error is realized using the channel estimation value of credible subcarrier in this way, the error of the edge sub-carrier channels estimated value effectively reduced, the performance for improving ofdm system, improves satisfaction of users.
Description
Technical field
The present invention relates to wireless communication technology field more particularly to a kind of orthogonal frequency division multiplexing (OFDM) system channel estimation method and
Terminal.
Background technology
With the continuous development of wireless communication technique, orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency
Division Multiplexing) systematic difference is also more and more universal, at the same time, for ofdm system
Performance requirement is also higher and higher.And in ofdm system, the precision of channel estimation will directly affect whole system
Performance.
Currently, the channel estimation methods of ofdm system are：The transmitting terminal of ofdm system can be at certain
Corresponding pilot signal is placed on a little carrier wave, and is sent to receiving terminal.Receiving terminal (such as channel estimation may be implemented in some
Terminal) receive corresponding pilot signal after, the frequency domain data of the pilot signal can be obtained, another mistake discrete Fourier transform transformation
To time domain, noise reduction process is done in time domain；Then discrete Fourier transform switches back to frequency domain, obtains the channel estimation value of frequency domain.
But by channel estimation value obtained by the above method, since the pilot signal that receiving terminal receives is from continuous
The both ends of the segment signal accordingly intercepted in frequency domain channel, frequency domain are discontinuous, are being discrete Fourier transform/inverse discrete Fu
In leaf transformation handle when, the channel estimation value of finally obtained edge subcarrier will appear larger error, to seriously affect
The performance of entire ofdm system, reduces the satisfaction of user experience.
Invention content
A kind of orthogonal frequency division multiplexing (OFDM) system channel estimation method provided in an embodiment of the present invention and terminal, the skill mainly solved
Art problem is：By the way that in the finally obtained channel estimation value of the channel estimation methods of current orthogonal Frequency Division Multiplexing system, edge is sub
The channel estimation value error of carrier wave is larger, seriously affects the performance of entire ofdm system, reduces user experience
The problem of satisfaction.
In order to solve the above technical problems, the embodiment of the present invention provides orthogonal frequency division multiplexing (OFDM) system channel estimation method, including：
Obtain the pilot signal for carrying out channel estimation；
The pilot signal is handled to obtain the channel estimation value of N number of subcarrier；
Select the channel estimation value of edges at two ends subcarrier from the channel estimation value of N number of subcarrier, and from surplus
The channel estimation value of credible subcarrier is selected in remaining channel estimation value；
The channel estimation value of credible subcarrier based on selection carries out weight to the channel estimation value of each edge subcarrier
Structure handles to obtain the reconstruct channel estimation value of each edge subcarrier；
The channel estimation value of each edge subcarrier is replaced with into corresponding reconstruct channel estimation value.
The embodiment of the present invention also provides a kind of terminal, including：
Signal acquisition module, for obtaining the pilot signal for carrying out channel estimation；
Processing module obtains the channel estimation value of N number of subcarrier for being handled the pilot signal；And it is used for
Select the channel estimation value of edges at two ends subcarrier from the channel estimation value of N number of subcarrier, and from remaining channel
The channel estimation value of credible subcarrier is selected in estimated value；
Channel estimation value reconstructed module, the channel estimation value of the credible subcarrier for being selected based on processing module is to described
The channel estimation value of each edge subcarrier is reconstructed processing and obtains the reconstruct channel estimation value of each edge subcarrier；
Channel estimation value replacement module, for the channel estimation value of each edge subcarrier to be replaced with corresponding reconstruct
Channel estimation value.
The embodiment of the present invention also provides a kind of computer storage media, and computer is stored in the computer storage media
Executable instruction, the computer executable instructions are used to execute service test method any one of above-mentioned.
The beneficial effects of the invention are as follows：
Orthogonal frequency division multiplexing (OFDM) system channel estimation method, terminal and the computer provided according to embodiments of the present invention is deposited
Storage media by obtaining the pilot signal for carrying out channel estimation, and handles the pilot signal to obtain N number of subcarrier
Channel estimation value；The channel estimation value of edges at two ends subcarrier is selected from the channel estimation value of obtained N number of subcarrier,
And the channel estimation value of credible subcarrier is selected from remaining channel estimation value.The channel of credible subcarrier based on selection is estimated
Processing is reconstructed to obtain the reconstruct channel of each edge subcarrier to the channel estimation value of each edge subcarrier in evaluation
The channel estimation value of each edge subcarrier is replaced with corresponding reconstruct channel estimation value by estimated value.It utilizes so credible
The channel estimation value of subcarrier realizes the reconstruct of the edge sub-carrier channels estimated value larger to error, the side effectively reduced
The error of edge sub-carrier channels estimated value, improves the performance of ofdm system, improves satisfaction of users.
Description of the drawings
Fig. 1 is the orthogonal frequency division multiplexing (OFDM) system channel estimation method flow diagram of the embodiment of the present invention one；
Fig. 2 is the detailed process schematic diagram that each edge sub-carrier channels estimated value of the embodiment of the present invention one reconstructs；
Fig. 3 is a kind of terminal knot that orthogonal frequency division multiplexing (OFDM) system channel estimation method may be implemented of the embodiment of the present invention two
Structure schematic diagram；
Fig. 4 is a kind of processing module structural schematic diagram of the embodiment of the present invention two；
Fig. 5 is another processing module structural schematic diagram of the embodiment of the present invention two.
Specific implementation mode
The embodiment of the present invention is described in further detail below by specific implementation mode combination attached drawing.
Embodiment one：
It is missed in order to avoid the channel estimation value of edge subcarrier in existing orthogonal frequency division multiplexing (OFDM) system channel estimation method
The larger problem of difference, promotes the performance of ofdm system, an embodiment of the present invention provides a kind of new orthogonal frequency division multiplexings
With system channel estimation method, Fig. 1 is referred to, test process includes：
S101:Obtain the pilot signal for carrying out channel estimation；
S102:Pilot signal is handled to obtain the channel estimation value of N number of subcarrier；
S103:The channel estimation value of edges at two ends subcarrier is selected from the channel estimation value of obtained N number of subcarrier,
And the channel estimation value of credible subcarrier is selected from remaining channel estimation value；
S104:The channel estimation value of credible subcarrier based on selection carries out weight to the channel estimation value of each edge subcarrier
Structure handles to obtain the reconstruct channel estimation value of each edge subcarrier；
S105:The channel estimation value of each edge subcarrier is replaced with into corresponding reconstruct channel estimation value.
It should be understood that the pilot signal in the present embodiment can be by the signal projector etc. of ofdm system
Sender unit is sent, and can include the channel information of N number of subcarrier in the pilot signal.
It specifically can be by existing orthogonal frequency division multiplexing it is worth noting that, being handled pilot signal in step S102
Handled with system channel estimation method, carry out successively pilot tone mother code elimination, inverse discrete Fourier transform, time domain noise reduction, from
The processing such as Fourier transformation are dissipated, to obtain the channel estimation value of N number of subcarrier, which is not described herein again for concrete processing procedure.
In the present embodiment, after handling pilot signal, the channel estimation value of obtained N number of subcarrier can be successively
It is denoted as H0, H1..., HN-1；If the edge subcarrier number per one end is k, then selected from the channel estimation value of this N number of subcarrier
The channel estimation value for the edges at two ends subcarrier selected out is：H0..., Hk-1；And HN-k..., HN-1.Wherein, the general values of N
It is 1024, i.e., after usually handling pilot signal, the channel estimation value of 1024 subcarriers can be obtained.For every one end
The selection of edge subcarrier number can then come flexibly to determine according to the quality of the actual performance of ofdm system, it is usual and
Speech, the actual performance of ofdm system is poorer, and the required edge subcarrier for carrying out channel estimation value reconstruct is more.
It is worth noting that, the edges at two ends subcarrier number selected can also be different, such as one end selects k edge
Son carries, and corresponding channel estimation value is H0..., Hk-1；The other end selects n edge to carry, and corresponding channel estimation value is
HN-n..., HN-1, wherein k ≠ n.
In the present embodiment, the subcarrier adjacent with edge subcarrier can be selected as credible subcarrier, the selection with
Channel estimation value of the channel estimation value of the adjacent subcarrier of edge subcarrier as credible subcarrier.It is worth noting that, institute
It should remove both ends remaining subcarrier after selected edge subcarrier to state the subcarrier adjacent with edge subcarrier,
Corresponding channel estimation value should be contained in remove edge subcarrier channel estimation value after remaining channel estimation value in.
It should be understood that the number for the credible subcarrier selected can be multiple, such as set the edge load at both ends
The channel estimation value of wave is respectively H0..., Hk-1And HN-k..., HN-1；If the number for the credible subcarrier selected is m,
Then edge sub-carrier channels estimated value H0..., Hk-1The channel estimation value of corresponding credible subcarrier is Hk..., Hk+m-1；Edge
The channel estimation value H of subcarrierN-k..., HN-1The channel estimation value of corresponding credible subcarrier is HN-k-m..., HN-k-1.Selection
The number of the credible subcarrier gone out should be selected according to actual demand, and typically, the number of credible subcarrier is generally selected
Being selected as 12 or 24 is advisable.
In the present embodiment, the channel estimation value of the credible subcarrier based on selection is to each edge subcarrier in step S104
The detailed process that channel estimation value is reconstructed may refer to Fig. 2, including：
S1041：To the channel estimation value of each edge subcarrier, by the channel estimation of its corresponding each credible subcarrier
Value carries out the first weighting processing；
S1042：The channel estimation value of the edge subcarrier is subjected to the second weighting processing；
S1043：The reconstruct channel of weighting treated each channel estimation value is added the to obtain edge subcarrier is estimated
Evaluation.
Specifically, the channel estimation value for setting the edge subcarrier at both ends is respectively H0..., Hk-1And HN-k..., HN-1；Choosing
The number for the credible subcarrier selected out is m；Then edge sub-carrier channels estimated value H0..., Hk-1Corresponding reconstruct channel estimation
Value is respectively：
Edge sub-carrier channels estimated value HN-k..., HN-1Corresponding reconstruct channel estimation value is respectively：
In the above formulas, it is seen that the channel estimation value of channel estimation value and the edge subcarrier to each credible subcarrier is all
It is weighted processing, with formula
For, Hk、Hk+1、…、Hk+m-1The channel estimation value of as each credible subcarrier, the channel estimation value pair of each credible subcarrier
The weighted value answered is followed successively by γ0*α0、γ0*α1、…、γ0*αm, the corresponding weighting of channel estimation value according to each credible subcarrier
Value carries out the first weighting processing to the channel estimation value of each credible subcarrier successively：γ0*[α0*Hk+α1*Hk+1+…+αm*
Hk+m-1]；H0For the channel estimation value of edge subcarrier, corresponding weighted value is β0, according to the weighted value to edge subcarrier
The second weighting of channel estimation value processing：β0*H0, finally handling result twice is added to have obtained final edge subcarrier weight
Structure channel estimation value
In the above formulas, the channel estimation value of each edge subcarrier is H0,……Hk-1When, the letter with each edge subcarrier
Road estimated value is HN-k,……HN-1When, channel estimation value reconstructs each credible sub- load when replacement module 33 reconstructs channel estimation value
The corresponding weighted value of channel estimation value of the channel estimation value and edge subcarrier of wave be it is symmetry equivalent, i.e.,：Edge subcarrier
Reconstruct channel estimation valueCalculating formula in each credible subcarrier channel estimation value and edge subcarrier channel estimation value pair
The weighted value answered reconstructs channel estimation value with edge subcarrierCorresponding weighted value is identical；……；Edge subcarrier weight
Structure channel estimation valueCalculating formula in each credible subcarrier channel estimation value and edge subcarrier channel estimation value pair
The weighted value answered reconstructs channel estimation value with edge subcarrierCorresponding weighted value is identical.
It is worth noting that, in the above formulas, α0、α1、…、αm, β0、β1、…、βmAnd γ0、γ1、…、γmValue
0 should all be more than or equal to and less than or equal to 1, specific value can flexibly be set according to actual demand.
Orthogonal frequency division multiplexing (OFDM) system channel estimation method provided in this embodiment specifically can be applied to each to be handed over
On the devices such as terminal, the signal receiver of Frequency Division Multiplexing system channel estimation.
Orthogonal frequency division multiplexing (OFDM) system channel estimation method provided in this embodiment, by obtaining for carrying out channel estimation
Pilot signal, and the pilot signal is handled to obtain the channel estimation value of N number of subcarrier；From obtained N number of subcarrier
The channel estimation value of edges at two ends subcarrier is selected in channel estimation value, and credible son is selected from remaining channel estimation value
The channel estimation value of carrier wave.The channel estimation value of credible subcarrier based on selection to the channel estimation value of each edge subcarrier into
Row reconstruction processing estimates the channel of each edge subcarrier to obtain the reconstruct channel estimation value of each edge subcarrier
Evaluation replaces with corresponding reconstruct channel estimation value.It is realized in this way using the channel estimation value of credible subcarrier larger to error
Edge sub-carrier channels estimated value reconstruct, the error of the edge sub-carrier channels estimated value effectively reduced improves just
The performance for handing over Frequency Division Multiplexing system, improves satisfaction of users.
Embodiment two：
Referring to Fig. 3, Fig. 3 is that the letter of ofdm system shown in embodiment one may be implemented in one kind provided in this embodiment
The terminal of channel estimation method, including：
Signal acquisition module 31, for obtaining the pilot signal for carrying out channel estimation.
Processing module 32 obtains the channel estimation value of N number of subcarrier for being handled pilot signal；And from obtaining
Select the channel estimation value of edges at two ends subcarrier in the channel estimation value of N number of subcarrier, and from remaining channel estimation
The channel estimation value of credible subcarrier is selected in value.
Channel estimation value reconstructs replacement module 33, the channel estimation of the credible subcarrier for being selected based on processing module 32
Value is reconstructed processing to the channel estimation value of each edge subcarrier and obtains the reconstruct channel estimation value of each edge subcarrier, and will
The channel estimation value of each edge subcarrier replaces with corresponding reconstruct channel estimation value.
It should be understood that the pilot signal in the present embodiment can be by the signal projector etc. of ofdm system
Sender unit is sent, and can include the channel information of N number of subcarrier in the pilot signal.
In the present embodiment, processing module 32 includes：Pilot signal processing unit 321 and edge sub-carrier selection unit 322,
Referring to Fig. 4.
Pilot signal processing unit 321 is followed successively by H for being handled to obtain to pilot signal0,H1,…,HN-1It is N number of
The channel estimation value of subcarrier.It should be understood that typically the number of subcarrier is generally 1024.
Edge sub-carrier selection unit 322 is carried for selecting edges at two ends from the channel estimation value of N number of subcarrier
The channel estimation value of wave.For example, set the edge subcarrier number of every one end as k, then the edges at two ends subcarrier selected
Channel estimation value be：H0,……Hk-1And HN-k,……HN-1.It is worth noting that, the edges at two ends subcarrier selected
Number can be different, but edges at two ends subcarrier number it is identical situation it is more common.
In the present embodiment, processing module 32 further includes credible sub-carrier selection unit 323, referring to Fig. 5, credible subcarrier choosing
Select unit 323 for select from remaining channel estimation value and the channel estimation value of the adjacent sub-carrier of edge subcarrier as
The channel estimation value of credible subcarrier.For example, channel estimation value H can be selectedk..., Hk+m-1Estimate as edge sub-carrier channels
Evaluation H0..., Hk-1Credible sub-carrier channels estimated value；Select channel estimation value HN-k-m..., HN-k-1As edge subcarrier
Channel estimation value HN-k..., HN-1Credible sub-carrier channels estimated value.It should be understood that m represents credible subcarrier in precedent
Number, wherein m values generally take 12 or 24.
In the present embodiment, channel estimation value reconstruct replacement module 33 based on credible sub-carrier selection unit 323 determine can
Believe subcarrier channel estimation value to the channel estimation value of each edge subcarrier be reconstructed including：
To the channel estimation value of each edge subcarrier, the channel estimation value of its corresponding each credible subcarrier is carried out
First weighting is handled, and the channel estimation value of the edge subcarrier is carried out the second weighting processing, and then by weighting, treated
Each channel estimation value is added to obtain the reconstruct channel estimation value of the edge subcarrier.
Specifically, the channel estimation value of each edge subcarrier is H0,……Hk-1When, channel estimation value reconstructs replacement module
33, which correspond to obtained reconstruct channel estimation value, is respectively：
In above formula, Hk、Hk+1、…、Hk+m-1The channel estimation value of as each credible subcarrier, the letter of each credible subcarrier
Estimated value corresponding weighted value in road is followed successively by γ0*α0、γ0*α1、…、γ0*αm, the channel estimation value according to each credible subcarrier
Corresponding weighted value carries out the first weighting processing to the channel estimation value of each credible subcarrier successively：γ0*[α0*Hk+α1*Hk+1
+…+αm*Hk+m-1]；H0For the channel estimation value of edge subcarrier, corresponding weighted value is β0, according to the weighted value to edge
The second weighting of channel estimation value of subcarrier is handled：β0*H0, finally handling result twice is added to have obtained final edge
Carrier wave reconstructs channel estimation valueVarious calculation is identical as this formula below, differs only in weighted value difference.
……
The channel estimation value of each edge subcarrier is HN-k,……HN-1When, channel estimation value reconstructs replacement module 33 and corresponds to
Obtained reconstruct channel estimation value is respectively：
In the above formulas, the channel estimation value of each edge subcarrier is H0,……Hk-1When, the letter with each edge subcarrier
Road estimated value is HN-k,……HN-1When, channel estimation value reconstructs each credible sub- load when replacement module 33 reconstructs channel estimation value
The corresponding weighted value of channel estimation value of the channel estimation value and edge subcarrier of wave is symmetry equivalent.
It is worth noting that, in the above formulas, α0、α1、…、αm, β0、β1、…、βmAnd γ0、γ1、…、γmValue
0 should all be more than or equal to and less than or equal to 1, specific value can flexibly be set according to actual demand.
Terminal provided in this embodiment obtains pilot signal by signal acquisition module 31, and right by processing module 32
The pilot signal is handled to obtain the channel estimation value of N number of subcarrier；It is selected from the channel estimation value of obtained N number of subcarrier
The channel estimation value of edges at two ends subcarrier is selected out, and selects the channel estimation of credible subcarrier from remaining channel estimation value
Value.Channel estimation value reconstructs letter of the channel estimation value to each edge subcarrier of credible subcarrier of the replacement module 33 based on selection
Processing is reconstructed to obtain the reconstruct channel estimation value of each edge subcarrier in road estimated value, and each edge is sub
The channel estimation value of carrier wave replaces with corresponding reconstruct channel estimation value.In this way with the edge sub-carrier channels estimated value after reconstruct
Instead of the edge sub-carrier channels estimated value that error before is larger, carrying for edge sub-carrier channels estimated value accuracy is realized
Height improves user experience to improve the performance of ofdm system.
Obviously, those skilled in the art should be understood that each module of the embodiments of the present invention or each step can be used
General computing device realizes that they can be concentrated on a single computing device, or be distributed in multiple computing device institutes
On the network of composition, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by them
It is stored in computer storage media (ROM/RAM, magnetic disc, CD) and is performed by computing device, and in some cases, it can
With the steps shown or described are performed in an order that is different from the one herein, or they are fabricated to each integrated circuit dies
Block, or by them multiple modules or step be fabricated to single integrated circuit module and realize.So the present invention does not limit
It is combined in any specific hardware and software.
It cannot recognize being further described made by the embodiment of the present invention the above content is specific embodiment is combined
The specific implementation of the fixed present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs,
Without departing from the inventive concept of the premise, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention
Protection domain.
Claims (10)
1. a kind of orthogonal frequency division multiplexing (OFDM) system channel estimation method, including：
Obtain the pilot signal for carrying out channel estimation；
The pilot signal is handled to obtain the channel estimation value of N number of subcarrier；
Select the channel estimation value of edges at two ends subcarrier from the channel estimation value of N number of subcarrier, and from remaining
The channel estimation value of credible subcarrier is selected in channel estimation value；
Place is reconstructed to the channel estimation value of each edge subcarrier in the channel estimation value of credible subcarrier based on selection
Reason obtains the reconstruct channel estimation value of each edge subcarrier；
The channel estimation value of each edge subcarrier is replaced with into corresponding reconstruct channel estimation value.
2. orthogonal frequency division multiplexing (OFDM) system channel estimation method as described in claim 1, which is characterized in that the pilot signal
The channel estimation value of the N number of subcarrier handled is followed successively by H0,H1,…,HN-1；
The channel estimation value that edges at two ends subcarrier is selected from the channel estimation value of N number of subcarrier includes：H0,……
Hk-1；And HN-k,……HN-1；The k is an end margin subcarrier number.
3. orthogonal frequency division multiplexing (OFDM) system channel estimation method as claimed in claim 2, which is characterized in that described from remaining letter
The channel estimation value of the credible subcarrier selected in road estimated value for the adjacent sub-carrier of the edge subcarrier channel estimation
Value, including：
With the H0,……Hk-1Corresponding Hk,……Hk+m-1；
And with the HN-k,……HN-1Corresponding HN-k-m,……HN-k-1；
The m is credible subcarrier number.
4. orthogonal frequency division multiplexing (OFDM) system channel estimation method as claimed in claim 3, which is characterized in that be based on the credible son
The channel estimation value of carrier wave to the channel estimation value of each edge subcarrier be reconstructed including：
To the channel estimation value of edge subcarrier described in each, the channel estimation value of its corresponding each credible subcarrier is carried out
First weighting is handled, and the channel estimation value of the edge subcarrier is carried out the second weighting processing, then handles the weighting
Each channel estimation value afterwards is added to obtain the reconstruct channel estimation value of the edge subcarrier.
5. orthogonal frequency division multiplexing (OFDM) system channel estimation method as claimed in claim 4, which is characterized in that the H0,……Hk-1
Corresponding reconstruct channel estimation value is respectively：
The HN-k,……HN-1Corresponding reconstruction channel estimation value is respectively：
The α0、α1、…、αm, β0、β1、…、βmAnd γ0、γ1、…、γmValue be more than or equal to 0 and be less than or equal to 1.
6. a kind of terminal, including：
Signal acquisition module, for obtaining the pilot signal for carrying out channel estimation；
Processing module obtains the channel estimation value of N number of subcarrier for being handled the pilot signal；And it is used for from institute
State the channel estimation value that edges at two ends subcarrier is selected in the channel estimation value of N number of subcarrier, and from remaining channel estimation
The channel estimation value of credible subcarrier is selected in value；
Channel estimation value reconstructs replacement module, and the channel estimation value of the credible subcarrier for being selected based on processing module is to described
The channel estimation value of each edge subcarrier is reconstructed processing and obtains the reconstruct channel estimation value of each edge subcarrier；And it will
The channel estimation value of each edge subcarrier replaces with corresponding reconstruct channel estimation value.
7. terminal as claimed in claim 6, which is characterized in that the processing module includes：
Pilot signal processing unit is followed successively by H for being handled to obtain to the pilot signal0,H1,…,HN-1N number of sub- load
The channel estimation value of wave；
Edge sub-carrier selection unit, for selecting edges at two ends subcarrier from the channel estimation value of N number of subcarrier
Channel estimation value；The channel estimation value of selected edges at two ends subcarrier includes：H0,……Hk-1；And
HN-k,……HN-1；The k is an end margin subcarrier number.
8. terminal as claimed in claim 7, which is characterized in that the processing module further includes credible sub-carrier selection unit；
The credible sub-carrier selection unit is used to select from remaining channel estimation value adjacent with the edge subcarrier
The channel estimation value of channel estimation value of the channel estimation value of subcarrier as credible subcarrier, the credible subcarrier includes：
With the H0,……Hk-1Corresponding Hk,……Hk+m-1；
And with the HN-k,……HN-1Corresponding HN-k-m,……HN-k-1；
The m is credible subcarrier number.
9. terminal as claimed in claim 8, which is characterized in that the channel estimation value reconstruct replacement module is based on described credible
The channel estimation value of subcarrier to the channel estimation value of each edge subcarrier be reconstructed including：
To the channel estimation value of edge subcarrier described in each, the channel estimation value of its corresponding each credible subcarrier is carried out
First weighting is handled, and the channel estimation value of the edge subcarrier is carried out the second weighting processing, then handles the weighting
Each channel estimation value afterwards is added to obtain the reconstruct channel estimation value of the edge subcarrier.
10. terminal as claimed in claim 9, which is characterized in that the channel estimation value of each edge subcarrier is H0,……
Hk-1When, the reconstruct channel estimation value that the channel estimation value reconstruct replacement module corresponds to is respectively：
The HN-k,……HN-1Corresponding reconstruction channel estimation value is respectively：
The α0、α1、…、αm, β0、β1、…、βmAnd γ0、γ1、…、γmValue be more than or equal to 0 and be less than or equal to 1.
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| CN201710011301.8A CN108282422A (en) | 2017-01-06 | 2017-01-06 | A kind of orthogonal frequency division multiplexing (OFDM) system channel estimation method and terminal |
| PCT/CN2017/115052 WO2018126842A1 (en) | 2017-01-06 | 2017-12-07 | Channel estimation method for orthogonal frequency division multiplexing system, and terminal |
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