CN104735002B - A kind of removing method and terminal of interference signal - Google Patents
A kind of removing method and terminal of interference signal Download PDFInfo
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- CN104735002B CN104735002B CN201310717929.1A CN201310717929A CN104735002B CN 104735002 B CN104735002 B CN 104735002B CN 201310717929 A CN201310717929 A CN 201310717929A CN 104735002 B CN104735002 B CN 104735002B
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Abstract
The present invention relates to the communications fields, disclose a kind of removing method and terminal of interference signal, can accurately restore and eliminate the interference of adjacent area PBCH.The removing method of the interference signal includes：When this cell and interfered cell are synchronous and the signal power of this cell is compared with the signal power of interfered cell, when described cell is not current signal power maximum cell, terminal passes through following steps and eliminates Physical Broadcast Channel PBCH interference：Generate the signal S of local Physical Broadcast Channel PBCHPBCH；According to the SPBCHPBCH channel estimations are carried out, the channel estimation value H of PBCH is obtainedPBCH；By the SPBCHWith the HPBCHDot product is carried out, the interference of the PBCH is restored；The interference of the PBCH is eliminated in the PBCH signals.The removing method and terminal of the interference signal eliminate the interference in LTE system in deterministic signal for user.
Description
Technical field
The present invention relates to the communications field, more particularly to the removing method and terminal of a kind of interference signal.
Background technology
LTE（Long Term Evolution, long term evolution）Technology has the energy for providing the user with high data rate
Power is considered the mainstream technology from 3G to 4G evolution.The technology has been obtained for developing rapidly at present, however as mobile communication
Development, frequency spectrum resource also seems more and more precious, and therefore, LTE uses identical networking.
Identical networking can boost the efficiency of frequency resources utilization, but the networking mode can bring it is mutual between co-frequency cell
Interference, and some co-channel interferences can seriously affect communication quality.Currently, solve co-channel interference method have network side coordinate and
FeICIC（Further enhanced inter-cell Interference Coordination, the cell further enhanced
Between interference coordination）, which is the operation for increasing user on the basis of original network side is coordinated, and user is adjacent by eliminating
Some deterministic signals of area, to achieve the purpose that eliminate interference.
In general, deterministic signal includes the CRS of adjacent area（Common Reference Signal, public reference signal）, it is adjacent
Area PBCH（Physical Broadcast Channel, Physical Broadcast Channel）, neighbor synchronization signal etc..Adjacent area CRS with it is synchronous
The interference elimination method of signal is fairly simple, and the CRS for restoring adjacent area by the channel estimation of adjacent area first is interfered and synchronous letter
Then number interference is eliminated the CRS of the adjacent area of recovery interference and synchronizing signal interference from receiving in data.
The interference elimination method of adjacent area PBCH is as shown in Figure 1, include the following steps：
Step 101 carries out channel estimation to multiple cells.
Channel estimation is the prior art, and this will not be repeated here.In addition it is also possible in conjunction with the CRS interference elimination methods of front
Obtain the channel estimation of the positions each cell CRS in adjacent area.Each cell can be the adjacent area configured by network side, can also be
The adjacent area that terminal oneself detects.
Step 102 carries out RSRP to multiple cells（Reference Signal Receiving Power, reference signal
Receive power）It measures and sorts.
The RSRP of multiple cell is measured using the channel estimation results at the positions CRS of multiple cells, the survey
Amount method is the prior art, and this will not be repeated here.The RSRP intensity of multiple cells to measuring is ranked up.
The RSRP intensity of multiple cells and this cell after sequence is compared, judges whether this cell is current most strong
Cell illustrates the interference very little of adjacent area, can be ignored, therefore need not be done if this cell is current most strong cell
Elimination is disturbed, demodulation decoding directly is carried out to PBCH signals.If this cell is not current most strong cell, need from adjacent area
The strongest cell of RSRP intensity starts, and following actions are executed to each cell in adjacent area：PBCH demodulation decodings are carried out, so
It recycles the data that demodulation and decoding obtain to generate local signal afterwards, carries out interference recovery using local signal, i.e., sequence executes
Step 103, step 104 and step 105 eliminate the interference of PBCH after restoring to obtain the interference of PBCH in receiving signal.
Step 103, the demodulation decoding for carrying out PBCH.
The prior art is decoded as to the demodulation of PBCH, this will not be repeated here.
Step 104, the interference for carrying out PBCH restore.
The PBCH channel estimations of the data and the cell that can be decoded using the PBCH of cell are encoded and are modulated,
The PBCH signals that local frequency domain generates are obtained, S can be expressed asPBCH, the specific method for encoding and modulating is the prior art, in detail
See 3GPP（3rd Generation Partnership Project, third generation partner program）Specification TS36.211 and
36.212, this will not be repeated here, and the channel of the PBCH corresponding positions then obtained using CRS channel estimation interpolation with the cell is estimated
It counts H and carries out dot product, obtain the interference of PBCH, i.e. P=SPBCH*H.Specific interpolation method can utilize the prior art, not do herein superfluous
It states.
Step 105, the interference for eliminating PBCH.
In the method, interference restores and the process of elimination can be the process of an iteration.
In addition, in the interference elimination method based on interfered cell and this cell synchronous, PBCH interference restores to be to utilize CRS
Channel estimation at position is restored, and is equivalent to and thinks that the power of CRS is equal with PBCH power, but the power of PBCH in practice
Might not be equal with the power of CRS, if simply thinking equal, it is possible to interfere elimination not exclusively, or excessively disappear
It removes, is equivalent to instead introduces extra interference in this way.
Further, since 3GPP is to carry out adjacent area interference based on heterogeneous network framework to eliminate, that is, it is based on this cell and interference
Carry out what adjacent area interference was eliminated on the basis of cell timing basic synchronization, it is therefore, adjacent when this cell is asynchronous with interfered cell
Area's interference can not be eliminated.
Therefore, interference elimination method in the prior art is not comprehensively also inaccurate.
Invention content
The purpose of the present invention is to provide a kind of removing method of interference signal and terminals, accurately can restore and eliminate
The interference of adjacent area PBCH.
In order to solve the above technical problems, embodiments of the present invention provide a kind of removing method of interference signal, including
Following steps：
When this cell and interfered cell are synchronous and the signal power of this cell is compared with the signal power of interfered cell, institute
When stating this cell not and be the maximum cell of current signal power, it is dry that terminal by following steps eliminates Physical Broadcast Channel PBCH
It disturbs：
Generate the signal S of local Physical Broadcast Channel PBCHPBCH；
According to the SPBCHPBCH channel estimations are carried out, the channel estimation value H of PBCH is obtainedPBCH；
By the SPBCHWith the HPBCHDot product is carried out, the interference of the PBCH is restored；
The interference of the PBCH is eliminated in the PBCH signals.
Embodiments of the present invention also provide a kind of terminal, and the terminal includes：
Generation unit, for when this cell and interfered cell synchronization and the signal power of this cell and the signal of interfered cell
Power compares, and when described cell is not current signal power maximum cell, generates local Physical Broadcast Channel PBCH's
Signal SPBCH；
Channel estimating unit, for according to the SPBCHPBCH channel estimations are carried out, the channel estimation value of PBCH is obtained
HPBCH；
First interference recovery unit, is used for the SPBCHWith the HPBCHDot product is carried out, the interference of the PBCH is restored；
First interference cancellation unit, the interference for eliminating the PBCH in the PBCH signals.
Embodiment of the present invention re-starts channel in terms of existing technologies, using the local PBCH signals of recovery and estimates
Meter, obtains the channel estimation at real PBCH, then restores the interference of PBCH again, and the final interference for eliminating PBCH avoids
The case where restoring not exclusively or excessively to restore using PBCH interference caused by the channel estimation of CRS in existing scheme.
Preferably, when described cell and the asynchronous interfered cell, the removing method of the interference signal also includes
Following steps：Interference signal is generated in frequency domain, and channel estimation is carried out to the interfered cell；According to the interference signal and institute
It states channel estimation and carries out interference recovery；The interference is eliminated in time domain to restore.
The interference signal includes：Public reference signal CRS, primary synchronization signal PSS, secondary synchronization signal SSS and physics are wide
Broadcast channel PBCH.
Interference signal is generated using in frequency domain, and channel estimation is carried out using interference signal, then in time domain or frequency domain profit
Interference recovery is carried out with channel estimation, finally interference is restored in time domain to carry out interference elimination method, solves network difference
The problem of eliminating is interfered under the scene of step.
Preferably, it is out-of-date once successfully to be read by terminal as the PBCH of the interfered cell, and the local physics of the generation is wide
Broadcast the signal S of channel PBCHPBCHIt specifically includes：Time of the PBCH is once read before obtaining, by current time and it is described before
The time work for once reading the PBCH is poor, obtains the time difference of current time and the preceding time for once reading the PBCH, institute
The information for stating PBCH carryings includes bandwidth of cell, physical mixed request automatic re-transmission indicating channel PHICH configuration informations and described
The corresponding System Frame Numbers of PBCH；The preceding corresponding System Frame Numbers of the PBCH once read are added with the time difference, are obtained
Current System Frame Number；According to the preceding bandwidth of cell once read, PHICH configuration informations and the current System Frame Number, life
At the SPBCH。
Bandwidth of cell, PHICH are configured in the information that the method for above-mentioned calculating local PBCH signals is carried using PBCH signals
Information will not change whithin a period of time, and only System Frame Number variation the characteristics of, by preceding described PBCH pairs once read
The method that the System Frame Number answered and current time are added with the time difference of the preceding primary time for reading PBCH current is to calculate
Uniting frame number should then further according to the local PBCH signals of bandwidth of cell, PHICH configuration informations and current System Frame Number production
Computational methods are quick and easy, can reduce the complexity of calculating.
Preferably, the channel estimation value H for obtaining PBCHPBCHFurther include：Extract the resource factor of the PBCH mappings
RE, by the SPBCHReference signal as the RE being drawn into carries out channel to the positions RE being drawn into and estimates
Meter, using the channel estimation value for being drawn into the positions RE as the channel estimation value of the PBCH；According to the letter of the PBCH
The performance number of PBCH is calculated in road estimated value；Calculate the average value of the performance number of all public reference signal CRS and described
The average value of the performance number of PBCH；Using the average value divided by all CRS of the performance number of the PBCH performance number it is flat
Mean value obtains the power ratio β of the PBCH and the CRS, extracts square root to obtain α to the β；The CRS that will be acquired in advance
Channel estimation value H at position is multiplied with the α, obtains the channel estimation value H of PBCHPBCH。
It will be understood to those skilled in the art that carrying out channel estimation using the resource factor for extracting the PBCH mappings
Method can reduce the complexity for calculating PBCH channel estimation values.
Description of the drawings
Fig. 1 is the method flow schematic diagram for eliminating PBCH interference in the prior art；
Fig. 2 is the method flow schematic diagram that first embodiment of the invention eliminates PBCH interference；
Fig. 3 is the method flow schematic diagram that second embodiment of the invention generates local PBCH signals；
Fig. 4 is the method flow schematic diagram that third embodiment of the invention obtains PBCH channel estimation values；
Fig. 5 is the method flow schematic diagram that four embodiment of the invention eliminates interference；
Fig. 6 is to carry out interference recovery, in time domain progress interference elimination method in frequency domain in four embodiment of the invention
Implementation process schematic diagram；
Fig. 7 is to carry out interference recovery, in time domain progress interference elimination method in time domain in four embodiment of the invention
Implementation process schematic diagram.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to each reality of the present invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention,
In order to make the reader understand this application better, many technical details are proposed.But even if without these technical details and base
In the various changes and modifications of following embodiment, each claim of the application technical side claimed can also be realized
Case.
First embodiment of the invention provides a kind of removing method of interference signal, is applied to this cell and interfered cell is same
When step, terminal eliminates the scene of PBCH interference, in the method, according to the local signal of the PBCH of generation and the letter of PBCH channels
Road estimated value restores the interference of PBCH, to finally eliminate the interference of PBCH.Specifically, as shown in Fig. 2, the removing method
Steps are as follows：
Step 201, multi-cell channel estimation.
Channel estimation is carried out using the CRS of cell in multiple adjacent areas measure or configuration, obtains each cell CRS
Channel estimation value at position.Channel estimation value at the positions each cell CRS can be denoted asWherein, n is more than 1
Integer.To nAverage the channel estimation value H that can be obtained at the positions CRS.
The method of channel estimation is the prior art, and therefore not to repeat here by the present invention.
Step 202, multiple cell RSRP are measured and sequence.
The RSRP of multiple cell is measured using the channel estimation results at the positions CRS of multiple cells, the survey
Amount method is the prior art, and this will not be repeated here.The RSRP intensity of multiple cells to measuring is ranked up.
The RSRP intensity of multiple cells after sequence is compared, when this cell RSRP and adjacent area RSRP ratios are respectively less than
Or when equal to preset thresholding, there is no need to carry out interference elimination, demodulation decoding directly is carried out to PBCH signals；When this cell
When RSRP and adjacent area RSRP ratios are all higher than preset thresholding, then need since the strongest cell of RSRP intensity in adjacent area,
Following actions are executed to each cell in adjacent area：PBCH demodulation decodings are carried out, demodulation and decoding is then recycled to obtain
Data generate local signal, carry out interference recovery using local signal, i.e., sequence executes step 203, step 204 and step
205, after restoring to obtain the interference of PBCH, PBCH interference is eliminated in receiving signal.
Step 203, PBCH demodulations decoding.
Demodulation method and interpretation method are the prior art, and therefore not to repeat here by the present invention.
Step 204, PBCH local signals generate.
If it is out-of-date that the PBCH of the strongest cell of current signal power was not read successfully once by terminal, step is utilized
Channel estimation value at the positions 203 data decoded out CRS corresponding with the cell is encoded, is modulated, and it is local to generate PBCH
Signal SPBCH, specific method is referring to 3GPP specifications TS36.211 and 36.212.
Step 205 carries out channel estimation according to PBCH local signals, obtains the channel estimation value H of PBCHPBCH。
Using PBCH carry out channel estimation method in the prior art using CRS progress the method for channel estimation it is identical,
Therefore not to repeat here by the present invention.
Step 206, by SPBCHWith HPBCHDot product is carried out, the interference of PBCH is restored.
The interference of the PBCH of recovery is denoted as p, then p=SPBCH·HPBCH。
Step 207, the interference that PBCH is eliminated in PBCH signals.
In the method, interference restores and the process of elimination can be the process of an iteration.
Embodiment of the present invention re-starts channel in terms of existing technologies, using the local PBCH signals of recovery and estimates
Meter, obtains the channel estimation at real PBCH, then restores the interference of PBCH again, and the final interference for eliminating PBCH avoids
The case where restoring not exclusively or excessively to restore using PBCH interference caused by the channel estimation of CRS in existing scheme.
Second embodiment of the invention provides a kind of removing method of interference signal, is applied to this cell and interfered cell is same
When step, the interference in PBCH signals is eliminated.Second embodiment makes certain improvements on the basis of first embodiment, the
Two embodiments include step 301 to step 307.Wherein step 301, step 302, step 303, step 305, step 306 and
Step 307 respectively with step 201, step 202, step 203, step 205, step 206 and the step 207 in first embodiment
Identical, step 304 is different from step 204, and step 304 is further improved on the basis of step 204, as shown in figure 3, main
It thes improvement is that：If it is out-of-date that the PBCH of current interfered cell was once successfully read by terminal, local physical broadcast is generated
The signal S of channel PBCHPBCHSpecifically include following steps：
Step 3041, the primary time for reading PBCH before obtaining make current time and the preceding primary time for reading PBCH
Difference obtains the time difference of current time and the preceding primary time for reading PBCH.
The information that PBCH is carried includes bandwidth of cell, PHICH configuration informations and the corresponding System Frame Numbers of PBCH.Due to
In the information that PBCH is carried, bandwidth of cell and PHICH configuration informations are as will not in broadcast message usual a period of time of cell
Change, always in the only System Frame Number of variation.So if once successfully reading the cell of PBCH for terminal, can be not required to
The PBCH demodulations decoding of the adjacent area is carried out, but according to current time and the time point for successfully reading cell PBCH before
The time difference of time extrapolates the System Frame Number of current time.Current System Frame Number, SFN_ can be indicated using SFN_now
Pre indicates that corresponding System Frame Number when preceding primary successfully reading PBCH, Delt_t indicate current time and successfully read before to be somebody's turn to do
Time difference between when cell PBCH, unit are millisecond（ms）.
The corresponding System Frame Numbers of the preceding PBCH once read are added by step 3042 with the time difference, obtain current system
Frame number.
Calculate that the formula of current System Frame Number is：SFN_now=(SFN_pre+Delt_t/10) %1024, wherein（Delt_
t/10）It indicates from SFN_Pre frame heads to the time difference of the current time of reception, unit ms, when by preceding primary successfully reading PBCH
Corresponding System Frame Number and current time and when successfully reading cell PBCH before between time difference summation after again with
1024 complementations indicate frame number from 0~1023 cycle.
Step 3043, according to the preceding bandwidth of cell once read, PHICH configuration informations and current System Frame Number, generate
SPBCH。
Then directly according to the preceding bandwidth of cell once read, PHICH information and the current System Frame Number being calculated
Generate local PBCH signals.Then step 305 is executed.
The method of above-mentioned calculating local PBCH signals utilizes bandwidth of cell, PHICH configuration informations in the information of PBCH carryings
It will not change whithin a period of time, and only System Frame Number is the characteristics of changing, the preceding PBCH once read is corresponding
Method that System Frame Number and current time are added with the time difference of the preceding primary time for reading PBCH calculates current system-frame
Number, then further according to the local PBCH signals of bandwidth of cell, PHICH configuration informations and current System Frame Number production, the calculating
Method is quick and easy, can reduce the complexity of calculating.
Third embodiment of the invention provides a kind of removing method of interference signal, is applied to this cell and interfered cell is same
When step, the interference in PBCH signals is eliminated.Third embodiment makes certain improvements on the basis of first embodiment, the
Three embodiments include step 401 to step 407.Wherein step 401, step 402, step 403, step 404, step 406 and
Step 407 respectively with step 201, step 202, step 203, step 204, step 206 and the step 207 in first embodiment
Identical, step 405 is different from step 205, as shown in figure 4, in step 405, using the mapping of PBCH channels resource unit into
Row channel estimation includes the following steps：
Step 4051, the RE for extracting PBCH mappings（Resource Element, resource factor）, by SPBCHAs being extracted
To the reference signal of RE channel estimation is carried out to the positions RE that are drawn into, by the channel estimation value for the positions RE being drawn into
Channel estimation value as PBCH.
In step 4051, n is the integer more than 1 and less than 6, and the channel of PBCH is calculated according to the RE being drawn into
Estimated value.Extract the part resource unit of PBCH mappings.In view of occupying 6 RB (Resource Block, money on PBCH frequency domains
Source block), it should be noted that each RB includes multiple RE, and 4 OFDM are occupied in time domain（Orthogonal Frequency
Division Multiplexing, orthogonal frequency division multiplexing）Symbol is converted into resource factor RE, there is 6*6*4=144 RE, extracts
It can be carried out in 144 RE.
Exemplary, extraction can respectively be carried out in two dimensions of time domain and frequency domain, and those skilled in the art hold very much
Readily understood, there are many modes of extraction, and the method for several extractions is feasible below：（1）N RB is extracted on frequency domain,
In 1≤n≤6；（2）M OFDM symbol is extracted in the time domain；（3）A subcarrier is extracted per N number of RE on frequency domain, in time domain
It is upper to extract one per M OFDM symbol, wherein N=6, M=2.
Step 4052, the performance number that PBCH is calculated according to the channel estimation value of PBCH.
Then the performance number of PBCH can be sought channel estimation results by carrying out channel estimation respectively to each positions RE
Mould square obtains.Specifically, by SPBCHAs the reference signal for the positions RE being drawn into, the positions RE being drawn into are carried out
Channel estimation will be drawn into channel estimation value of the channel estimation value as PBCH of the positions RE.By the channel estimation value of PBCH
It is denoted as HPBCH。
Assuming that the RE extracted is M, then the M performance number of PBCH can be calculated, M is greater than or equal to 2, this M work(
Rate value is：m=1,2…M。
Step 4053, the average value of performance number for calculating all public reference signal CRS and the performance number of PBCH are averaged
Value.
Channel estimation/channel power of CRS is come out in CRS location estimations, it is assumed that has T adjacent area, T to be greater than or equal to
2, the channel estimation value at the T position CRS can be obtained according to step 401The power for acquiring T CRS, by the T CRS
Power be denoted as：n=1,2…T。
Then it averages respectively to the performance number of the M performance number of PBCH and multiple CRS again, it will be to the M work(of PBCH
The average value that rate value acquires is denoted as：|mean|HPBCH|2, the average value acquired to the performance number of multiple CRS is denoted as：mean|HCRS
|2。
Step 4054, using PBCH performance number average value divided by all CRS performance number average value, obtain PBCH
With the power ratio β of CRS, β is extracted square root to obtain α.
I.e.α is the relationship between PBCH channel estimation values and CRS channel estimation values
Value.
Channel estimation value H at the positions CRS acquired in advance is multiplied by step 4055 with α, obtains the letter at the positions PBCH
Road estimated value HPBCH。
That is HPBCH=H·α。
The interference of the PBCH of recovery is denoted as p ', then p '=SPBCH*H·α.Wherein, H is at the positions CRS acquired in advance
Channel estimation value.
It will be understood to those skilled in the art that carrying out channel estimation using the resource factor for extracting the PBCH mappings
Method can reduce the complexity for calculating PBCH channel estimation values.
The 4th embodiment of the present invention is related to a kind of removing method of interference signal, is applied to this cell and interfered cell
When asynchronous, interference elimination is carried out by step as shown in Figure 5, is mainly included the following steps that：
Step 501, the interference signal that interfered cell is generated in frequency domain.
Step 502 carries out channel estimation to interfered cell.
Step 503 carries out interference recovery according to interference signal and channel estimation.
Step 504 eliminates interference recovery in time domain.
Wherein, interference signal includes：CRS、PSS（Primary Synchronization Signal, primary synchronization signal）、
SSS（Secondary synchronization signals, secondary synchronization signal）And PBCH.
In addition, in the step 502 of this method, carrying out channel estimation to interfered cell can carry out in time domain, can also be
Frequency domain carries out, and therefore, there may be the concrete methods of realizing that interference as shown in Figure 6 and Figure 7 is eliminated, as shown in fig. 6, when to dry
Disturb cell carry out channel estimation when frequency domain carries out, then can according to the interfered cell that frequency domain generates interference signal in frequency domain
Carry out interference recovery.Channel estimation in frequency domain can utilize existing OFDM (orthogonal frequency division multiple access, Orthogonal frequency-
Division multiplexing) the various known technologies of channel estimation in frequency domain realize that therefore not to repeat here by the present invention.
Furthermore, it is necessary to carry out FFT transform according to the selection data of the cell timing module timing of each cell, Fourier inversion is used for
Frequency domain data is transformed into time domain.Then interference elimination is carried out in time domain.The process that above-mentioned interference restores and eliminates can be one
The process of a iteration.
Interference shown in Fig. 7 is eliminated in implementation method, and carry out channel estimation to interfered cell carries out in time domain, to interference
Cell, which carries out time domain channel estimation, can also utilize the various known technologies of existing various time domain channel estimations, such as correlation etc.
It realizes, therefore not to repeat here by the present invention.The interference signal of interfered cell is generated in frequency domain, and then carrying out Fourier inversion will
Interference signal in the interfered cell that frequency domain generates is transformed into the interference signal of time domain, according to the interference signal and channel estimation
It obtains interference signal in the interference of time domain to restore, finally time domain carries out interference elimination again.With in interference elimination method shown in fig. 6
Identical to be, in interference elimination method shown in Fig. 7, the time domain data of each cell is also fixed according to the cell of each cell
When module timing choose, interference eliminate time domain carry out.Above-mentioned interference restores and the process of elimination can be the mistake of an iteration
Journey.
Interference signal is generated using in frequency domain, and channel estimation is carried out using interference signal, then in time domain or frequency domain profit
Interference recovery is carried out with channel estimation, finally interference is restored in time domain to carry out interference elimination method, solves network difference
The problem of eliminating is interfered under the scene of step.
Fifth embodiment of the invention provides a kind of terminal, which includes：
Generation unit, for when this cell and interfered cell synchronization and the signal power of this cell and the signal of interfered cell
Power compares, and when the signal power of this cell is not current signal power maximum cell, generates local Physical Broadcast Channel
The signal S of PBCHPBCH。
Channel estimating unit, for according to SPBCHPBCH channel estimations are carried out, the channel estimation value H of PBCH is obtainedPBCH。
First interference recovery unit, is used for SPBCHWith HPBCHDot product is carried out, the interference of PBCH is restored.
First interference cancellation unit, the interference for eliminating PBCH in PBCH signals.
Embodiment of the present invention in terms of existing technologies, the local that channel estimating unit is generated according to generation unit
PBCH signals re-start channel estimation, obtain the channel estimation at real PBCH, and then the first interference recovery unit restores
The interference of PBCH, the first interference cancellation unit finally eliminate the interference of PBCH, avoid in existing scheme and are estimated using the channel of CRS
The case where PBCH interference caused by meter restores not exclusively or excessively to restore.
Sixth embodiment of the invention provides a kind of terminal, when synchronous with interfered cell applied to this cell, eliminates PBCH
Interference in signal.Present embodiment and the 5th embodiment are essentially identical, and difference place is, if current signal power is most
It is out-of-date that the PBCH of strong cell was once successfully read by terminal, and the generation unit of the terminal includes following subelement：
Acquisition subelement, for the primary time for reading PBCH before obtaining, by current time with preceding primary reading PBCH's
It is poor that time is made, and obtains the time difference of current time and the preceding primary time for reading PBCH, the information that PBCH is carried includes cell band
Wide, PHICH configuration informations and the corresponding System Frame Numbers of PBCH.
Subelement is handled, for the corresponding System Frame Numbers of the preceding PBCH once read to be added with the time difference, is obtained current
System Frame Number.
Subelement is generated, for according to the preceding bandwidth of cell once read, PHICH configuration informations and current system-frame
Number, generate SPBCH。
Bandwidth of cell, PHICH configuration informations will not change whithin a period of time in the information carried using PBCH signals, and
For only System Frame Number the characteristics of changing, processing subelement will obtain the corresponding systems of PBCH once read before subelement obtains
Method that system frame number and current time is added with the time difference of the time of preceding primary reading PBCH calculates current System Frame Number,
Then PBCH signal of the subelement further according to bandwidth of cell, PHICH configuration informations and current System Frame Number production local is generated,
The computational methods are quick and easy, can reduce the complexity of calculating.
Seventh embodiment of the invention provides a kind of terminal, for when this cell is synchronous with interfered cell, obtaining PBCH
Channel estimation value, the 7th embodiment makes certain improvements on the basis of five embodiments, which includes：
Extracting unit, the resource factor RE for extracting PBCH mappings, by SPBCHReference as the RE being drawn into is believed
Number channel estimation is carried out to the positions RE that are drawn into, using the channel estimation value for the positions RE being drawn into as the channel of PBCH
Estimated value.
First computing unit, the performance number for PBCH to be calculated according to the channel estimation value of PBCH.
Second computing unit, the average value of the performance number for calculating all public reference signal CRS and the power of PBCH
The average value of value.
Be divided by unit, and the average value of the performance number of the average value divided by all CRS for the performance number using PBCH obtains
The power ratio β of PBCH and CRS extracts square root β to obtain α.
Multiplying unit, the channel estimation value H at the positions CRS for that will acquire in advance are multiplied with α, obtain the channel of PBCH
Estimated value HPBCH。
It will be understood to those skilled in the art that carrying out channel estimation using the resource factor for extracting the PBCH mappings
Method can reduce the complexity for calculating PBCH channel estimation values.
Eighth embodiment of the invention provides a kind of terminal, for when this cell and asynchronous interfered cell, eliminating interference
Interference in signal, the terminal include：
Processing unit for generating interference signal in frequency domain, and carries out channel estimation to interfered cell.
Second interference recovery unit, for carrying out interference recovery according to interference signal and channel estimation.
Second interference cancellation unit is restored for eliminating interference in time domain.
Wherein, interference signal includes：CRS, PSS, SSS and PBCH.
Processing unit generates interference signal in frequency domain, and carries out channel estimation using interference signal, and then the second interference is extensive
Multiple unit carries out interference recovery in time domain or frequency domain using channel estimation, and final second interference cancellation unit is extensive to interfering in time domain
Interference elimination is carried out again, is solved the problems, such as to interfere under the nonsynchronous scene of network and be eliminated.
It is noted that being logic module about each module involved in the embodiment of device, in reality
In, a logic unit can be a physical unit, can also be a part for a physical unit, can also be with more
The combination of a physical unit is realized.The operation principle of each physical unit can be with the narration in reference method embodiment, the present invention
Details are not described herein.In addition, in order to protrude the innovative part of the present invention, it will not be with solution institute of the present invention in present embodiment
The technical issues of proposition, the less close unit of relationship introduced, but this does not indicate that there is no other single in present embodiment
Member.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (8)
1. a kind of removing method of interference signal, which is characterized in that include the following steps：
When this cell and interfered cell are synchronous and the signal power of this cell is compared with the signal power of interfered cell, described
When cell is not current signal power maximum cell, terminal passes through following steps and eliminates Physical Broadcast Channel PBCH interference：
Generate the signal S of local Physical Broadcast Channel PBCHPBCH；
According to the SPBCHPBCH channel estimations are carried out, the channel estimation value H of PBCH is obtainedPBCH；
By the SPBCHWith the HPBCHDot product is carried out, the interference of the PBCH is restored；
The interference of the PBCH is eliminated in the PBCH signals；
When described cell and the asynchronous interfered cell, the removing method of the interference signal also comprises the steps of：
Interference signal is generated in frequency domain, and channel estimation is carried out to the interfered cell；
Interference recovery is carried out according to the interference signal and the channel estimation；
The interference is eliminated in time domain to restore.
2. the removing method of interference signal according to claim 1, which is characterized in that the interference signal includes：
Public reference signal CRS, primary synchronization signal PSS, secondary synchronization signal SSS and Physical Broadcast Channel PBCH.
3. the removing method of interference signal according to claim 1, which is characterized in that when the PBCH quilts of the interfered cell
It is out-of-date that terminal was once successfully read, the signal S for generating local Physical Broadcast Channel PBCHPBCHIt specifically includes：
The time that the PBCH is once read before obtaining makees current time and the preceding time for once reading the PBCH
Difference obtains the time difference of current time and the preceding time for once reading the PBCH, and the information that the PBCH is carried includes cell
Bandwidth, physical mixed request automatic re-transmission indicating channel PHICH configuration informations and the corresponding System Frame Numbers of the PBCH；
The preceding corresponding System Frame Numbers of the PBCH once read are added with the time difference, obtain current System Frame Number；
According to the preceding bandwidth of cell once read, PHICH configuration informations and the current System Frame Number, generate the SPBCH。
4. the removing method of interference signal according to claim 1, which is characterized in that described to obtain the channel estimation of PBCH
Value HPBCHFurther include：
The resource factor RE for extracting the PBCH mappings, by the SPBCHReference signal as the RE being drawn into is to institute
It states the positions RE being drawn into and carries out channel estimation, using the channel estimation value of the positions RE being drawn into as the PBCH
Channel estimation value；
The performance number of PBCH is calculated according to the channel estimation value of the PBCH；
Calculate the average value of the performance number of all public reference signal CRS and the average value of the performance number of the PBCH；
Using the average value of the performance number of the average value divided by all CRS of the performance number of the PBCH, the PBCH is obtained
With the power ratio β of the CRS, the β is extracted square root to obtain α；
Channel estimation value H at the positions CRS acquired in advance is multiplied with the α, obtains the channel estimation value of PBCH
HPBCH。
5. a kind of terminal of the elimination of interference signal, which is characterized in that the terminal includes：
Generation unit, for when this cell and interfered cell synchronization and the signal power of this cell and the signal power of interfered cell
It compares, when described cell is not current signal power maximum cell, generates the signal of local Physical Broadcast Channel PBCH
SPBCH；
Channel estimating unit, for according to the SPBCHPBCH channel estimations are carried out, the channel estimation value H of PBCH is obtainedPBCH；
First interference recovery unit, is used for the SPBCHWith the HPBCHDot product is carried out, the interference of the PBCH is restored；
First interference cancellation unit, the interference for eliminating the PBCH in the PBCH signals；
When described cell and the asynchronous interfered cell, the terminal further includes：
Processing unit for generating interference signal in frequency domain, and carries out channel estimation to the interfered cell；
Second interference recovery unit, for carrying out interference recovery according to the interference signal and the channel estimation；
Second interference cancellation unit is restored for eliminating the interference in time domain.
6. terminal according to claim 5, which is characterized in that the interference signal includes：
Public reference signal CRS, primary synchronization signal PSS, secondary synchronization signal SSS and Physical Broadcast Channel PBCH.
7. terminal according to claim 5, which is characterized in that the generation unit includes following subelement：
Subelement is obtained, was once successfully read out-of-date, primary reading before obtaining by terminal for the PBCH when the interfered cell
It is the time of the PBCH, current time and the preceding time work for once reading the PBCH is poor, current time is obtained with before
Once read the time difference of the time of the PBCH, the information that the PBCH is carried include bandwidth of cell, physical mixed request from
Dynamic retransmission indicating chanel PHICH configuration informations and the corresponding System Frame Numbers of the PBCH；
Processing subelement is obtained for the preceding corresponding System Frame Numbers of the PBCH once read to be added with the time difference
Current System Frame Number；
Subelement is generated, for according to the preceding bandwidth of cell once read, PHICH configuration informations and the current system-frame
Number, generate the SPBCH。
8. terminal according to claim 5, which is characterized in that the terminal further includes：
Extracting unit, the resource factor RE for extracting the PBCH mappings, by the SPBCHAs the RE's being drawn into
Reference signal carries out channel estimation to the positions RE being drawn into, by the channel estimation value of the positions RE being drawn into
Channel estimation value as the PBCH；
First computing unit, the performance number for PBCH to be calculated according to the channel estimation value of the PBCH；
Second computing unit, the average value of the performance number for calculating all public reference signal CRS and the power of the PBCH
The average value of value；
Be divided by unit, the average value of the performance number of the average value divided by all CRS for the performance number using the PBCH,
The power ratio β of the PBCH and the CRS are obtained, the β is extracted square root to obtain α；
Multiplying unit obtains PBCH's for the channel estimation value H at the positions CRS acquired in advance to be multiplied with the α
Channel estimation value HPBCH。
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| US20160380657A1 (en) * | 2015-06-26 | 2016-12-29 | Intel IP Corporation | Interference cancellation |
| CN109495413B (en) * | 2017-09-11 | 2022-04-01 | ***通信有限公司研究院 | Method for transmitting synchronization signal block, method for measuring cell quality, base station and terminal |
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