CN106656877A

CN106656877A - Interference cancellation method and apparatus

Info

Publication number: CN106656877A
Application number: CN201510714087.3A
Authority: CN
Inventors: 刘庆伟; 储建栋; 苏威
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-10-28
Filing date: 2015-10-28
Publication date: 2017-05-10
Anticipated expiration: 2035-10-28
Also published as: CN106656877B

Abstract

An embodiment of the invention provides an interference cancellation method and apparatus, which relate to the field of communication, for reducing the interference in a first communication system under a shared spectrum scene, thereby increasing the throughput of the first communication system. The interference cancellation method is applied to a first cell having a neighboring second cell. The first cell belongs to the first communication system, the second cell belongs to a second communication system, and the first cell and the second cell have a shared spectrum. The method comprises the steps of carrying out, by a base station of the first cell, interference pre-cancellation for a received uplink signal based on a preset strategy to obtain an interference pre-cancellation signal, the uplink signal including a first uplink signal transmitted by user equipment in the first cell and a second uplink signal transmitted by user equipment in the second cell; and eliminating an interference signal in the interference pre-cancellation signal based on a channel response estimated value of the interference pre-cancellation signal. The embodiment of the invention is applied between heterogeneous systems where the shared spectrum is present.

Description

A kind of interference elimination method and device

Technical field

The present embodiments relate to the communications field, more particularly to a kind of interference elimination method and device.

Background technology

With the fast development of mobile industry, LTE (Long Term Evolution, Long Term Evolution) System deployment is into the gesture in the whole world.And 1800MHz frequency spectrums rely on outstanding covering power, into For the first-selection of LTE system deployment.It is but 1800MHz frequency spectrum resources are rare and big at present multiplex In GSM (Global System for Mobile Communication, global system for mobile communications) System deployment.Because at this stage also there are a considerable amount of focuses in gsm system in many regions, The 1800MHz frequency spectrums of all gsm systems directly cannot be again formulated for LTE systems by operator The 1800MHz frequency spectrums of system carry out the whole network deployment.In addition, the 1800M of 50% operator is with a width of 10M～25M, it is impossible to while meet the big bandwidth demand of gsm system and LTE system, allows GSM The frequency spectrum resource of system and LTE system is no longer limited by fixed configurations, but realizes frequency spectrum resource Distribution according to need, can exclusively enjoy shared frequency spectrum, in GSM in gsm system traffic idle LTE system Traffic busy GSM can exclusively enjoy shared frequency spectrum；I.e. the frequency spectrum of gsm system and LTE system is moved State is shared.The frequency spectrum dynamic of gsm system and LTE system is shared as shown in Figure 1.

Built together due to gsm system and LTE system and belong to identical networking on 1800MHz frequency spectrums, The carrier energy of gsm system can be leaked in the frequency spectrum of LTE system in shared frequency spectrum, to LTE The Sideband Spectrum of system can produce strong jamming, cause LTE system demodulation performance to decline, the bit error rate Increase, so, LTE system is needed badly and the interference that gsm system is produced is suppressed or eliminated.

In prior art, a kind of common suppression or elimination interference method are IRC (Interference Rejection Combining, AF panel merges) technology, such as LTE system minizone suppression System or the main method for eliminating are IRC technologies, as shown in Fig. 2 IRC technologies are by connecing The collection of letters number or the reception signal of change after pilot tone go out the covariance of interference signal and white noise Matrix, using the covariance matrix docking collection of letters number of interference signal and white noise AF panel is carried out Merge, so as to play the diversity and combining techniques of inhibitory action to interference signal.

Because gsm system is narrow band signal, under the conditions of peer-level, the signal of gsm system The signal power of power ratio LTE system is strong, because the power of interfering signal power is to disturbing association side The accuracy of difference matrix affects larger, therefore there is shared frequency spectrum in gsm system and LTE system Under scene, when using IRC technologies the interference that gsm system is produced being suppressed or eliminated, no Can effectively eliminate or suppress interference signal, may result in eNodeB in LTE system (envoled NobeB, evolved base station) bit error rate lifting, throughput declines.

The content of the invention

Embodiments of the invention provide a kind of interference elimination method and device, are total to reduce frequency spectrum The interference in the first communication system under scene is enjoyed, so as to improve the throughput of the first communication system.

To reach above-mentioned purpose, embodiments of the invention are adopted the following technical scheme that：

In a first aspect, the embodiment of the present invention provides a kind of interference elimination method, methods described application In first community, the first community has adjacent area second community, wherein, the first community Belong to the first communication system, the second community belongs to the second communication system, the first community There is shared frequency spectrum with the second community, methods described includes：

The upward signal for receiving is disturbed the base station of the first community according to preset strategy It is pre- to eliminate, obtain disturbing pre- elimination signal；Wherein, the upward signal includes that described first is little User equipment sends in first upward signal and the second community of user equipment transmission in area The second upward signal；

It is pre- to the interference to eliminate according to the pre- channel response estimate for eliminating signal of the interference Signal carries out interference elimination.

With reference in a first aspect, in the first possible embodiment of first aspect, described The base station of first community carries out disturbing pre- elimination to the upward signal for receiving according to preset strategy, Obtain disturbing before pre- elimination signal, methods described also includes：

Obtain the energy value of second upward signal；

If the energy value of second upward signal is more than the first thresholding, the first community Base station, carries out disturbing pre- elimination according to preset strategy to the upward signal for receiving.

With reference to the first possible implementation of first aspect, second in first aspect can In the implementation of energy, the energy value for obtaining second upward signal includes：

Obtain the frequency of the second community；

The energy value of the M subcarrier comprising the second community frequency is calculated, institute is obtained The energy value of the second upward signal is stated, wherein, 12≤M≤60.

With reference to second possible implementation of first aspect, the third in first aspect can In the implementation of energy, the M subcarrier includes and is with the frequency of second communication system 12 subcarriers that center is chosen.

With reference to second possible implementation or the third possibility of first aspect of first aspect Implementation, in the 4th kind of possible implementation of first aspect, described in the acquisition The frequency of second community, including：

The first community receives the frequency of the second community that telegon sends.

With reference to the first possible implementation of first aspect, the 5th kind in first aspect can In the implementation of energy, the preset strategy includes：First preset strategy or the second preset strategy, Wherein,

First preset strategy includes：The described up letter that the base station of the first community is received Interference signal in number is configured to statistical model, and to the statistical model interference reconstruct is carried out； The interference signal after reconstruct is offseted in frequency domain；

Second preset strategy includes：The base station of the first community receives the base of the second community Stand the soft bit after the demodulation for sending or the original bit stream after decoding, it is and little according to described first It is soft after the channel information of interference signal is to demodulation in the upward signal that the base station in area receives Original bit stream after bit or decoding carries out interference reconstruct；To the interference after reconstruct in frequency domain Signal is offseted.

With reference to the 5th kind of possible implementation of first aspect, the 6th kind in first aspect can Can implementation in, the base station of the first community to the upward signal that receives, according to default Strategy carries out disturbing pre- elimination, obtains disturbing pre- elimination signal, including：

If the energy value of the M subcarrier is more than the first thresholding and less than the second thresholding；Then root Carry out disturbing pre- elimination according to first preset strategy, obtain disturbing pre- elimination signal；

If the energy value of the M subcarrier is more than second thresholding, according to described second Preset strategy carries out disturbing pre- elimination, obtains disturbing pre- elimination signal.

With reference to the 5th kind of possible implementation or the 6th kind of possibility of first aspect of first aspect Implementation, it is described by described in the 7th kind of possible implementation of first aspect Interference signal in the upward signal that the base station of one cell receives is configured to statistical model, Interference reconstruct is carried out to the statistical model, including：

According to the institute that the spectral characteristic of the second community receives the base station of the first community The interference signal stated in upward signal is configured to statistical model：

Weight is carried out to the interference signal according to the statistical model and reconstruct expression formula Y=H*X Structure, obtains Y₁=[y (0), y (1) ..., y (K-1)]^T, wherein, K is the quantity of the subcarrier for needing to offset, H is K*M rank interference coefficient matrixes；

Wherein, n_cFor the index that the second community carrier wave is mapped to the first community subcarrier.

With reference to the 5th kind of possible implementation or the 6th kind of possibility of first aspect of first aspect Implementation, in the 8th kind of possible implementation of first aspect, described in the basis The channel information of interference signal is to demodulation in the upward signal that the base station of first community receives Original bit stream after rear soft bit or decoding carries out interference reconstruct, including：

Estimate interference signal in the upward signal that the base station of the first community receives Road information；

The original bit stream after the soft bit after the demodulation or decoding is processed as by over-sampling Baseband signal in the first community sample rate；

The baseband signal is transformed to by frequency-region signal according to the sub-carrier number of the first community, And M subcarrier in the middle of choosing from the frequency-region signal, it is designated as：R=[r (0), r (1) ..., r (M-1)]^T；

According to reconstruction formula y=h*R to the original bit after the soft bit after the demodulation or decoding Stream is reconstructed, and obtains Y₂, wherein, h is K*M rank interference coefficient matrixes, and K is offseted for needs Subcarrier quantity.

With reference to the 8th kind of possibility of the 5th kind of possible implementation to first aspect of first aspect Implementation in any one possible implementation, in the 9th kind of possibility of first aspect Implementation in, it is described the interference signal after reconstruct is offseted in frequency domain, including：

Judge the position between the carrier wave of the second community and the first community central subcarrier Relation；

When the carrier wave of the second community is in the left side of the first community central subcarrier, According to formula x_1c(k)=x (k)-Y (k-n_c- L) interference signal after the reconstruct is eliminated；Its In, Y is the interference signal after reconstruct, takes from Y₁Or Y₂；K=n_c+L,...,n_c+L+K-1；K is to need The quantity of the subcarrier to be offseted；L is to need first subcarrier for offseting little apart from described second The distance of district center frequency；

When the carrier wave of the second community is in the right of the first community central subcarrier, According to formula x_2c(k)=x (k)-Y (k-n_c+ L+K), wherein, Y is the interference signal after reconstruct, is taken From Y₁Or Y₂；K=n_c-L-K,...,n_c-L-1；K is the quantity of the subcarrier for needing to offset；L is to need Distance of first subcarrier to be offseted apart from the second community center frequency point.

With reference to second possible implementation of first aspect, the tenth kind in first aspect can In the implementation of energy, the energy for calculating the M subcarrier comprising the second community frequency Value, including：

According to formulaMeter Calculate the energy value of the M subcarrier comprising the second community frequency；Wherein, n_cFor described second Cell carrier is mapped to the index of the first community subcarrier, and RSSI is the M subcarrier Energy value.

With reference in a first aspect, in a kind of the tenth possible implementation of first aspect, in institute First community is stated to the upward signal for receiving, is carried out disturbing pre- elimination according to preset strategy, obtained Interference is pre- to be eliminated before signal, including：

Each OFDM symbol in upward signal is carried out into time-domain windowed；

The Cyclic Prefix of the OFDM symbol after to carrying out time-domain windowed is added to corresponding described The afterbody of OFDM symbol.

Second aspect, the embodiment of the present invention provides a kind of interference blanking unit, described device application In first community, the first community has adjacent area second community, wherein, the first community Belong to the first communication system, the second community belongs to the second communication system, the first community There is shared frequency spectrum with second community, described device includes：

Interference is pre- to eliminate unit, for the first community base station to the upward signal that receives, Carried out disturbing pre- elimination according to preset strategy, obtain disturbing pre- elimination signal；Wherein, on described Row signal includes the first upward signal that user equipment sends in the first community and described the The second upward signal that two intra-cell users equipment send；

Interference cancellation unit, for eliminating the channel response estimate of signal in advance according to the interference, The signal that eliminates pre- to the interference carries out interference elimination.

With reference to second aspect, in the first possible implementation of second aspect, the dress Putting also includes：

Acquiring unit, for obtaining the energy value of second upward signal；

Judging unit, for judging the energy value of second upward signal whether more than first Limit；

The pre- unit that eliminates of the interference in the judging unit specifically for determining on described second The energy value of row signal is more than after the first thresholding, to the upward signal for receiving, according to default plan Slightly carry out disturbing pre- elimination.

With reference to the first possible implementation of second aspect, second in second aspect may Implementation in, the acquiring unit, including：

Acquisition module, for obtaining the frequency of the second community；

Computing module, for calculating the M subcarrier comprising the second community frequency Energy value, obtains the energy value of second upward signal, wherein, 12≤M≤60.

With reference to second possible implementation of second aspect, the third in second aspect can In the implementation of energy, the M subcarrier includes and is with the frequency of second communication system 12 subcarriers that center is chosen.

With reference to second possible implementation or the third possibility of second aspect of second aspect Implementation, in the 4th kind of possible implementation of second aspect, the acquisition module Specifically for：

Receive the frequency of the second community that telegon sends.

With reference to the first possible implementation of second aspect, the 5th kind in second aspect can In the implementation of energy, it is pre- including the first pre- cancellation module or second that the interference eliminates in advance unit Cancellation module, the first pre- cancellation module is used to perform the first preset strategy；

The first pre- cancellation module is specifically included：First reconstructed module, for by described first Interference signal in the upward signal that the base station of cell receives is configured to statistical model；It is right The statistical model carries out interference reconstruct；First offsets module, after in frequency domain to reconstruct Interference signal offseted；

The second pre- cancellation module is used to perform the second preset strategy；

The second pre- cancellation module is specifically included：Second reconstructed module, for receiving described The original bit stream after soft bit or decoding after the demodulation that the base station of two cells sends, and according to The channel information pair of interference signal in the upward signal that the base station of the first community receives The original bit stream after soft bit or decoding after demodulation carries out interference reconstruct；Second offsets module, For in frequency domain to carrying out interference reconstruct after interference signal offset.

With reference to the 4th kind of possible implementation of second aspect, the 6th kind in second aspect can In the implementation of energy, the judging unit is additionally operable to：Judge the energy of the M subcarrier Whether value is less than the second thresholding more than the first thresholding；

The pre- unit that eliminates of the interference is also particularly useful for big in the energy value of the M subcarrier It is less than after the second thresholding in the first thresholding, carries out disturbing pre- according to the described first pre- cancellation module Eliminate, obtain disturbing pre- elimination signal；

The pre- unit that eliminates of the interference is also particularly useful for big in the energy value of the M subcarrier After second thresholding, carry out disturbing pre- elimination according to the described second pre- cancellation module, obtain Signal is eliminated to interference is pre-.

With reference to the 5th kind of possible implementation or the 6th kind of possibility of second aspect of second aspect Implementation, in the 7th kind of possible implementation of second aspect, it is described first reconstruct Module specifically for：

With reference to the 5th kind of possible implementation or the 6th kind of possibility of second aspect of second aspect Implementation, in the 8th kind of possible implementation of second aspect, it is described second reconstruct Module specifically for：

Estimate the interference signal in the upward signal that the base station of the first community receives Channel information；

According to reconstruction formula y=h*R to the original bit after the soft bit after the demodulation or decoding Stream is reconstructed, and obtains Y₂；Wherein, h is K*M rank interference coefficient matrixes, and K is offseted for needs Subcarrier quantity.

With reference to the 8th kind of possibility of the 5th kind of possible implementation to second aspect of second aspect Implementation in any one possible implementation, in the 9th kind of possibility of second aspect Implementation in, described first offset module and second offset module specifically for：

With reference to second possible implementation of second aspect, the tenth kind in second aspect can Can implementation in, the computing module specifically for：

According to formulaCalculate The energy value of the M subcarrier comprising the second community frequency；Wherein, n_cIt is little for described second Area's carrier wave is mapped to the index of the first community subcarrier, and RSSI is the M subcarrier Energy value.

It is described in a kind of the tenth possible implementation of second aspect with reference to second aspect Device also include time-domain windowed unit, the time-domain windowed unit specifically for：

Each OFDM symbol in upward signal is carried out into time-domain windowed；

The Cyclic Prefix of the OFDM symbol after to carrying out time-domain windowed is added to corresponding institute State the afterbody of OFDM symbol.

The embodiment of the present invention provides a kind of interference elimination method, is applied to first community, and described the One cell has adjacent area second community, wherein, the first community belongs to the first communication system, The second community belongs to the second communication system, and the first community and second community exist shared Frequency spectrum, the base station of the first community is done by the upward signal for receiving according to preset strategy Pre- elimination is disturbed, obtains disturbing pre- elimination signal；Rung according to the pre- channel for eliminating signal of the interference Estimate is answered, the pre- interference signal eliminated in signal of the interference is eliminated, the present invention is by depositing Carried out disturbing pre- elimination according to preset strategy in the first community and second community of shared frequency spectrum, by Weaken in the pre- interference strength eliminated in signal of gained interference after pre- elimination is carried out to interference, then Further elimination is done to interference according to the pre- channel response estimate for eliminating signal of interference, is improve The accuracy of the pre- channel response estimate for eliminating signal of interference, such that it is able to preferably to interference Eliminated or suppressed, while reducing by the first communication system uplink error rate first is improve The up throughput of communication system.

Description of the drawings

In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will to embodiment or The accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, below Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art For, on the premise of not paying creative work, can be obtaining other according to these accompanying drawings Accompanying drawing.

Fig. 1 is the shared schematic diagram of GSM and LTE frequency spectrums dynamic in prior art；

Fig. 2 is that the interference in prior art using AF panel folding eliminates schematic diagram；

Fig. 3 is a kind of application scenarios schematic diagram of interference elimination method provided in an embodiment of the present invention；

Fig. 4 a are a kind of schematic flow sheet one of interference elimination method provided in an embodiment of the present invention；

Fig. 4 b are the machine that a kind of interference elimination method provided in an embodiment of the present invention carries out time-domain windowed Structure schematic diagram；

Fig. 5 is a kind of schematic flow sheet two of interference elimination method provided in an embodiment of the present invention；

Fig. 6 is a kind of structural representation one of interference blanking unit provided in an embodiment of the present invention；

Fig. 7 is a kind of structural representation two of interference blanking unit provided in an embodiment of the present invention；

Fig. 8 is a kind of structural representation three of interference blanking unit provided in an embodiment of the present invention；

Fig. 9 is a kind of structural representation four of interference blanking unit provided in an embodiment of the present invention.

Specific embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical side in the embodiment of the present invention Case is clearly and completely described, it is clear that described embodiment is only the present invention one Divide embodiment, rather than the embodiment of whole.Based on the embodiment in the present invention, this area is general The every other embodiment that logical technical staff is obtained under the premise of creative work is not made, Belong to the scope of protection of the invention.

Technical scheme provided in an embodiment of the present invention can apply to various cordless communication networks, for example：Entirely Ball mobile communication (global system for mobile communication, referred to as GSM) system, CDMA (code division multiple access, referred to as CDMA) system, wideband code division are more Location (wideband code division multiple access, referred to as WCDMA) system, general shifting Dynamic communication (universal mobile telecommunication system, referred to as UMTS) system, It is GPRS (general packet radio service, referred to as GPRS) system, long-term Evolution (long term evolution, referred to as LTE) system, advanced Long Term Evolution (long term Evolution advanced, referred to as LTE-A) system, global interconnection inserting of microwave (worldwide Interoperability for microwave access, referred to as WiMAX) system etc..Term " network " " system " can be replaced mutually.Term "and/or" in the embodiment of the present invention, it is only a kind of The incidence relation of description affiliated partner, expression there may be three kinds of relations, for example, A and/or B, Can represent：Individualism A, while there is A and B, individualism B these three situations. In addition, character "/" in the embodiment of the present invention, typicallys represent forward-backward correlation pair as if a kind of "or" Relation.

First communication system described in the embodiment of the present invention and the second communication system can be respectively above-mentioned any There is shared frequency spectrum between two kinds of different cordless communication networks, and two kinds of different cordless communication networks. For example, the first communication system and the second communication system can be respectively WCDMA system and LTE System, gsm system and LTE system, WCDMA system and gsm system etc., the present invention This is not limited, because for doing between the different system of any two that there is shared frequency spectrum Disturb the principle and processing mode and gsm system and the shared frequency of LTE system presence for suppressing or eliminating The processing mode of spectrum is identical, is only exemplary, in the embodiment of the present invention with the first communication system and Second communication system is respectively as a example by LTE system and gsm system and illustrates.Do not have and appoint What special instruction implication.

As shown in Figure 3, there is provided a kind of LTE system and gsm system have answering for shared frequency spectrum With scene, first community belongs to LTE system, and second community belongs to gsm system, first community With second community adjacent area each other.Wherein, second community edge user equipment (user equipment, Referred to as UE) uplink interference may be produced to the base station of first community.

Wherein, in embodiments of the present invention, base station (base station, referred to as BS) can be and UE Or other communication sites such as relay, the equipment for being communicated, base station can provide specific physical region Communication overlay.For example, base station can be specifically the base transceiver station (Base in GSM or CDMA Transceiver Station, referred to as BTS) or base station controller (Base Station Controller, letter Referred to as BSC)；Can also be node B (Node B, referred to as NB) or the UMTS in UMTS In radio network controller (Radio Network Controller, referred to as RNC)；Can also be LTE In evolved base station (envoled Node B, referred to as ENB or eNodeB)；Or, it is also possible to It is other access network equipments of the offer access service in cordless communication network, the present invention is not limited.Show Example property, in the application scenarios shown in Fig. 3, the base station of first community can be eNodeB, and second is little The base station in area can be BTS.

In embodiments of the present invention, UE can be distributed in whole wireless network, and each UE can be quiet State or mobile.UE is properly termed as terminal (terminal), mobile station (mobile station), user Unit (subscriber unit), platform (station) etc..UE can be cell phone (cellular phone), Personal digital assistant (personal digital assistant, referred to as PDA), radio modem (modem), Wireless Telecom Equipment, handheld device (handheld), kneetop computer (laptop Computer), wireless phone (cordless phone), WLL (wireless local loop, Referred to as WLL) platform etc..When UE is applied to M2M modes to communicate, UE is properly termed as M2M ends End, can be specifically intelligent electric meter, intelligent appliance of support M2M communications etc..

As shown in figure 4, embodiments providing a kind of interference elimination method, is applied to One cell, second community is the adjacent area of the first community, wherein, the first community belongs to First communication system, the second community belongs to the second communication system, first communication system There is shared frequency spectrum (as shown in Figure 3) with the second communication system, methods described includes：

S1, the base station of the first community are done to the upward signal for receiving according to preset strategy Pre- elimination is disturbed, obtains disturbing pre- elimination signal.

S2, the channel response estimate for eliminating signal in advance according to the interference, disappear in advance to the interference Except signal carries out interference elimination.

Interference elimination method provided in an embodiment of the present invention can be performed by eNodeB.

The embodiment of the present invention provides a kind of interference elimination method, by the to there is shared frequency spectrum One cell and second community carry out disturbing pre- elimination according to preset strategy, pre- due to carrying out to interference The pre- interference strength eliminated in signal of gained interference weakens after elimination, eliminates further according to interference is pre- The channel response estimate of signal does further elimination to interference, improves interference and eliminates signal in advance Channel response estimate accuracy, such that it is able to preferably interference being eliminated or being pressed down System, reduces the first communication system uplink error rate, while it is up to improve the first communication system Throughput.

Exemplary, the first communication system is LTE system, and the second communication system is GSM systems System.

As shown in figure 3, the upward signal can include that be located at the LTE system first is little The first upward signal that UE1 in area sends and in the second community in gsm system The second upward signal that UE2 sends, wherein, for first community, first community is received The second upward signal be interference signal.

In a kind of preferred example of the embodiment of the present invention, before step S1, methods described is also wrapped Include：

S3, the energy value for obtaining second upward signal；

Wherein, the energy value of the second upward signal can be with M subcarrier in the second upward signal It is energy value and representing.

Wherein it is possible to the energy value of second upward signal is obtained in several ways, this Bright embodiment is not defined to this, is only exemplary, for example, specifically can pass through following Step A1-A2 obtains the energy value of second upward signal：

A1, the frequency for obtaining the second community；

Wherein, obtaining the mode of the frequency of the second community has various, the embodiment of the present invention pair This is not defined, and is only exemplary, and the embodiment of the present invention can be by following two possibility The mode of realization obtains the frequency of the second community.

The first mode in the cards includes：

Eco (eCoordinator, telegon) obtains the frequency of second community；

The frequency of the second community for receiving is sent to Eco the base station of the first community.

Second mode in the cards includes：

The base station of first community sends to Eco and asks, described to ask for indicating that the Eco is obtained Take the frequency of the second community；

The Eco frequency of second community and is fed back to institute according to the acquisition request State the base station of first community.

Wherein, Eco respectively with MME (Mobility Management Entity, mobile management Entity), S-GW and the corresponding base station controller of second community and corresponding with first community First communication system is connected, and cooperate with industry between the second communication system and the first communication system for providing Business is processed.Wherein, the first communication system can be LTE system, and the second communication system can be GSM/UMTS systems.

The corresponding base station controller of second community obtains the frequency of second community from MME, and by institute The frequency for stating second community reports Eco.

A2, the energy value for calculating the M subcarrier comprising the second community frequency, wherein, 12≤M ＜ 60.

Preferably, it is general in practical operation to choose 40 in order to reduce the complicated amount of system operations Subcarrier, it is further preferred that the M subcarrier is：According to pre-set bandwidths, with described 12 subcarriers chosen centered on the frequency of second community.

Wherein, the embodiment of the present invention is not defined to the concrete bandwidth value of pre-set bandwidths, in reality Can be configured as needed in the application of border.

Exemplary, the embodiment of the present invention provides a kind of for calculating comprising second community frequency The formula of the energy value of M subcarrier of point：

Wherein, n_cFor the index that the second community carrier wave is mapped to the first community subcarrier, RSSI For the energy value of the M subcarrier.

For example, when the M subcarrier is：According to pre-set bandwidths, with the second community During 12 subcarriers chosen centered on frequency, the energy value of 12 subcarriers is：

RSSI=| x (n_c-5)|²+|x(n_c-4)|²+...+|x(n_c)|²+|x(n_c+1)|²+|x(n_c+2)|²+...+|x(n_c+6)|²。

If the energy value of S4, second upward signal is more than the first thresholding, the first community Base station, according to preset strategy to receive upward signal carry out disturbing pre- elimination.

Wherein, the first thresholding can be configured according to actual needs, and the embodiment of the present invention is not entered Row is concrete to be limited, for example, when the demand on signal quality to first community than it is relatively low when, can be by The comparison that first thresholding is arranged is high, when the demand on signal quality to first community is higher, The ratio that can be arranged first thresholding is relatively low, it is preferred that first in the embodiment of the present invention Thresholding is -95dBm.

Because the power of interference signal affects larger for the channel response estimate of interference signal, When interference signal is weaker, directly interference is eliminated using according to the channel response estimate of interference signal The method effect of signal is preferable.And when interference signal is stronger, directly using according to interference signal Channel response estimate eliminate interference signal method effect it is poor.The embodiment of the present invention is by setting Put the first thresholding, on the one hand, be more than first in the energy value of the second upward signal (interference signal) During thresholding, upward signal is carried out by S1 disturb pre- elimination, the described second up letter can be reduced Number energy value, the accuracy of channel response estimate is improved, such that it is able to preferably to described the The second upward signal that one cell is received carries out disturbing elimination and suppression；On the other hand, on second When the energy value of row signal (interference signal) is less than or equal to the first thresholding, can directly using existing Interference cancellation techniques (for example, IRC technologies) the second upward signal is eliminated, can subtract The complexity and reduces cost of few interference elimination method, improves efficiency.

Wherein, IRC technologies are concretely comprised the following steps：Obtain the autocorrelation matrix of the upward signal； The covariance matrix of the interference signal is estimated by the autocorrelation matrix of the upward signal；Root It is logical to described first by AF panel folding according to the covariance matrix of the interference signal The interference signal between letter system and the second communication system is eliminated or suppressed.

The covariance matrix that it is critical only that calculating interference signal of IRC technologies, the association side of interference signal The accuracy of difference Matrix Estimation can have a huge impact to the performance of IRC technologies, interference signal Covariance matrix specific formula for calculation it is as follows：

LTE system receives signal：

The covariance matrix of interference signal：

It follows that the power of interference signal is accurate for interference signal covariance matrix Property affect it is larger, when interference signal is stronger, the standard of the covariance matrix of interference signal Really property can be deteriorated.The upward signal that the embodiment of the present invention is received by the base station to first community, Carried out disturbing after pre- elimination according to preset strategy so that the interference of the interference signal in upward signal Remitted its fury, then calculates its interference covariance matrix by IRC technologies, due to doing now Disturb that signal strength signal intensity is weaker, it is accurate so as to improve obtained interference signal covariance matrix True property, and then preferably interference can be eliminated or suppressed, reduce the first communication system System uplink error rate, while improve the up throughput of the first communication system.

In another example of the embodiment of the present invention, preset strategy can include：First preset strategy or Second preset strategy, illustrates separately below.

1st, the first preset strategy includes：By the base station of the first community receive it is described up Interference signal in signal is configured to statistical model, and to the statistical model interference reconstruct is carried out； The interference signal after reconstruct is offseted in frequency domain.

Wherein, the mode that the pre- interference signal eliminated in signal of interference is configured to statistical model is had Various, the embodiment of the present invention is not defined to this, for example, specifically be able to will be done by a1-b1 The interference signal disturbed in pre- elimination signal is configured to statistical model：

A1, the base station of the first community is received according to the spectral characteristic of the second community The upward signal in interference signal be configured to statistical model：

Wherein, M is that the upward signal for receiving first community carries out being obtained after frequency domain conversion To N number of frequency domain data in, centered on the frequency of second community choose；

B1, according to the statistical model and reconstruct expression formula Y=H*X the interference signal is carried out Reconstruct, obtains Y₁=[y (0), y (1) ..., y (K-1)]^T, wherein, K is the number of the subcarrier for needing to offset Amount, H is K*M rank interference coefficient matrixes；

Wherein, H is the interference obtained using channel estimation method according to the spectral characteristic of second community Coefficient matrix, for example, MMSE (Minimum Mean Square Error, least mean-square error) Algorithm and LS algorithms, in order to effectively eliminate interference signal and noise, it is preferred that the present invention is real Apply example and interference coefficient matrix H is obtained using MMSE algorithms.

In order to reduce the complexity of interference elimination method, in specific implementation process, can be advance It is described up that the base station for calculating the first community according to the spectral characteristic of second community receives The corresponding interference coefficient matrix H of interference signal in signal, then by the interference coefficient matrix H Store, in the upward signal received to the base station of the first community is needed When interference signal is reconstructed, the base station of first community can be by directly reading the interference system Matrix number H, and the interference signal is reconstructed according to reconstruct expression formula Y=H*X.

2nd, the second preset strategy includes：The base station of the first community receives the second community The original bit stream after soft bit or decoding after the demodulation that base station sends, and according to described first After the channel information of interference signal is to demodulation in the upward signal that the base station of cell receives Original bit stream after soft bit or decoding carries out interference reconstruct；In frequency domain to reconstruct after it is dry Disturb signal to be offseted.

Wherein, interference letter in the upward signal for being received according to the base station of the first community Number channel information to the soft bit after demodulation or decoding after original bit stream carry out interference weight Structure, the embodiment of the present invention is not defined to this, for example, specifically can will be described by a2-d2 The channel information of interference signal is to demodulation in the upward signal that the base station of first community receives Original bit stream after rear soft bit or decoding carries out interference reconstruct：

A2, estimate interference letter in the upward signal that the base station of the first community receives Number channel information；

Wherein, the channel information of interference signal refers to that in wireless communication field second community is to Channel attribute of the interference signal that one cell is interfered in communication link.That is the letter of second community The signal dispersion (Scattering) in road, weak (fading, the multipath fading or of environment Shadowing fading), the information such as range attenuation (power decay of distance).

Wherein, interference letter in the upward signal that the base station of the first community receives is estimated Number the mode of channel information have various, embodiment of the present invention here is not defined, exemplary The upward signal that receives of the base station that can in the following manner estimate the first community The channel information of middle interference signal：

Three kinds of known channel models based on LTE system, for example, ETU (Extended Typical Urban model, extend typical Urban channel model), EVA (Extended Vehicular A Model, extends vehicle channel model), (Extended Pedestrian A model expand EPA Exhibition pedestrian channel's model) three kinds of channel informations are drawn, and three kinds of channel informations are stored, Then the delay spread value that first community is measured according to LTE system is little to described first in needs It is straight when the channel information of interference signal is estimated in the upward signal that the base station in area receives Connect the corresponding channel information of reading.

B2, by over-sampling by the soft bit after the demodulation or decoding after original bit stream at Reason is the baseband signal in the first community sample rate；

Wherein, soft bit or decoding after the base station handle demodulation of second community in the embodiment of the present invention Original bit stream afterwards passes to the base station of first community, and the base station of first community is to soft bit or ratio Spy's stream is processed as the baseband signal of second community according to second community UE transmitter principle, then passes through Original bit stream after soft bit after the demodulation or decoding is sampled the by over-sampling wave filter In one cell sample rate, baseband signal is obtained.

C2, the baseband signal is transformed to by frequency domain letter according to the sub-carrier number of the first community Number, and M subcarrier in the middle of choosing from the frequency-region signal, it is designated as：

R=[r (0), r (1) ..., r (M-1)]^T；

Wherein it is possible in several ways baseband signal is transformed into frequency-region signal, the present invention is real Applying example does not carry out signal to this, and exemplary, the embodiment of the present invention can be according to first community Sub-carrier number passes through FFT (Fast Fourier Transformation, fast discrete Fourier transformation) Baseband signal is transformed into the frequency-region signal consistent with first community sub-carrier number.

D2, according to reconstruction formula y=h*R to the soft bit after the demodulation or decoding after original ratio Special stream is reconstructed, and obtains Y₂；Wherein, h is K*M rank interference coefficient matrixes, and K is right to need The quantity of the subcarrier for disappearing.

In another preferred example of the invention, upward signal of the first community to reception, root Carry out disturbing pre- elimination according to preset strategy, obtain disturbing pre- elimination signal, can include：

Wherein, the second thresholding can be configured according to actual needs, and the embodiment of the present invention is not entered Row is concrete to be limited, for example, when the demand on signal quality to first community than it is relatively low when, can be by The comparison that second thresholding is arranged is high, when the demand on signal quality to first community is higher, The ratio that can be arranged second thresholding is relatively low, it is preferred that second in the embodiment of the present invention Thresholding is -70dBm.

The embodiment of the present invention is by arranging the second thresholding, on the one hand, in the energy of the second upward signal Value (energy value of interference signal) can pass through more than the first thresholding and during less than the second thresholding First preset strategy carries out disturbing pre- elimination to the upward signal that the base station of the first community receives, The energy of the second upward signal in reduce the upward signal, so as to improve channel response estimate Accuracy is obtained, the second upward signal that the base station such that it is able to preferably eliminate first community receives； On the other hand, when the energy value of second upward signal is more than second thresholding, first is little The base station in area can carry out disturbing elimination and suppression using the second preset strategy to upward signal, this Bright embodiment is divided the energy value of second upward signal by arranging the second thresholding, from And choose significantly more efficient preset strategy carries out disturbing pre- elimination to upward signal, such that it is able to effective Ground eliminates the second upward signal that the base station of first community receives.

It should be noted that when in the upward signal that the base station of first community receives comprising described the During the second upward signal of the base station of two cells, can be by arranging the first thresholding and the second thresholding To select preset strategy, it is also possible to directly using any one in preset strategy to upward signal In the second upward signal eliminated and suppressed, for example, the base station of first community can be fixed Using the second up letter in the upward signal that the first preset strategy is received to the base station of first community Number eliminated and suppressed, it is also possible to be fixed to use base station of second preset strategy to first community The second upward signal in the upward signal of reception is eliminated and suppressed, it is also possible to pre- by first If in the upward signal received to the base station of first community after strategy and the cascade of the second preset strategy Second upward signal is eliminated and suppressed, and the embodiment of the present invention is not defined to this.

Wherein, the interference letter in the first preset strategy and the second preset strategy, after described pair of reconstruct Number offseted, including：

Judge the position between the carrier wave of the second community and the first community central subcarrier Relation.

When the carrier wave of the second community is in the left side of the first community central subcarrier, According to formula x_1c(k)=x (k)-Y (k-n_c- L) interference signal after the reconstruct is eliminated；Its In, k=n_c+L,...,n_c+L+K-1；Y is the interference signal after reconstruct, takes from Y₁Or Y₂；K is to need The quantity of the subcarrier to be offseted；L is to need first subcarrier for offseting little apart from described second The distance of district center frequency；

Wherein, the embodiment of the present invention for judge the second community carrier wave be in described first The concrete mode on the left side of center of housing estate subcarrier is not defined, exemplary, and the present invention is real Applying example can pass through the frequency of relatively more described second communication system and the frequency of first communication system Relation between point, if the frequency of second communication system is less than first communication system Frequency, then the carrier wave of the first community in the first community central subcarrier the left side, If the frequency of second communication system is more than the frequency of first communication system, described the The right of the carrier wave of one cell in the first community central subcarrier.

Wherein, the embodiment of the present invention is not defined to K concrete numerical values, when described M son is carried When the energy ratio of ripple is larger, i.e., described second community to the interference signal of the first community very Qiang Shi, the ratio that can be arranged the concrete numerical value of the K is larger, you can be offseted by increase The quantity of second community subcarrier by the energy dropoff of second upward signal, when the M The energy comparison hour of subcarrier, i.e., interference signal of the described second community to the first community When weaker, can be by the smaller of the concrete numerical value of K setting, you can with by offseting The quantity of a small amount of second community subcarrier by the energy dropoff of second upward signal, due to every The quantity of individual second community edge customer equipment not necessarily, the interference signal intensity to first community Also not necessarily, the concrete numerical value of the K can be depending on actual conditions.

In order to preferably eliminate first community first community apart from second community frequency remotely The interference signal of the second community that base station receives, the embodiment of the present invention can also include：

Each OFDM symbol in upward signal is carried out into time-domain windowed；

Wherein it is possible to pass through time-domain windowed algorithm (for example, Nyquist windows, trapezoid window) to upper Each OFDM in row signal (Orthogonal Frequency Division Multiplexing, Orthogonal frequency division multiplexi) symbol carries out time-domain windowed, i.e. each OFDM symbol to receiving Number plus trapezoid window, it is preferred that embodiment of the present invention trapezoid window carries out time-domain windowed to upward signal.

As shown in Figure 4 b, due to plus trapezoid window can be a part for each OFDM symbol afterbody Useful signal is filtered, and CP (Cyclic Prefix, Cyclic Prefix) is exactly the duplication of afterbody, So the afterbody that the CP carried out after time-domain windowed is added to each OFDM symbol is merged, so The impact that time domain plus trapezoid window bring to useful signal can be made up, therefore the embodiment of the present invention is also wrapped Include：

Preferably, upward signal of the embodiment of the present invention in the base station of first community to reception, Carried out disturbing pre- elimination according to preset strategy, obtain disturbing also includes to upper before pre- elimination signal Row signal carries out frequency domain conversion.

As shown in figure 5, illustrating to above-mentioned interference elimination method below by specific embodiment.

The embodiment of the present invention can apply in any two kinds of different cordless communication networks, and this two kinds There is shared frequency spectrum between different cordless communication networks, be only it is exemplary, the embodiment of the present invention still with The application scenarios that a kind of LTE system and gsm system shown in Fig. 3 has shared frequency spectrum are said It is bright.Wherein, LTE system and gsm system can be configured with multiple cells, in the embodiment of the present invention In only illustrate by taking first community and second community as an example；

600th, each OFDM symbol in upward signal is carried out into time-domain windowed；To carry out when The Cyclic Prefix of the OFDM symbol after the adding window of domain is added to the corresponding OFDM symbol Afterbody；

601st, the base station of first community carries out frequency domain conversion to the upward signal for receiving；

Wherein, the upward signal can include the user being located in the first community of the LTE system Use in first upward signal of the transmission of equipment 1 and the edge of the second community in gsm system The second upward signal that family equipment 2 sends, wherein, the user equipment 2 in the edge of second community The second upward signal for sending can be including on be possible to interfere the first community second Row signal；

Wherein, have various to the mode that upward signal carries out frequency domain conversion, frequency domain modular converter can be passed through Frequency domain conversion is carried out to upward signal can also carry out frequency domain conversion to upward signal by other forms, this Inventive embodiments are not defined to this.

602nd, judge whether the energy value of second upward signal that the base station of first community receives is big In the first thresholding, if then execution step 603, if it is not, then execution step 604；

603rd, whether the energy value of second upward signal is judged less than the second thresholding, if then holding Row step 605, if it is not, then execution step 606；

Wherein, the energy value of second upward signal is judged whether less than the method for the second thresholding, Above-described embodiment is may be referred to, the present invention will not be described here.

604th, interference elimination is carried out to second upward signal using AF panel folding.

Wherein, the detailed process of AF panel folding can be as described in above-mentioned embodiment, this It is bright to will not be described here.

605th, the second upward signal is carried out using the first preset strategy disturbing pre- elimination, is then held Row step 607；

Wherein, the specific embodiment in the first preset strategy may be referred to such as above-mentioned embodiment, The present invention will not be described here.

606th, upward signal is carried out using the second preset strategy disturbing pre- elimination, then performs step Rapid 607；

Wherein, the specific embodiment in the second preset strategy may be referred to such as above-mentioned embodiment, The present invention will not be described here.

607th, the interference after reconstruct is offseted in frequency domain, then execution step 604；

Wherein, the concrete grammar that the interference after reconstruct is offseted may refer in frequency domain Embodiment is stated, the present invention will not be described here.

The embodiment of the present invention provides a kind of interference elimination method, and the embodiment of the present invention is by judging the The energy value of two cells carries out disturbing pre- elimination so as to choose suitable preset strategy, due to Two cells select to preset to the interference signal that first community is brought according to the energy value of second community Strategy, can effectively weaken the interference signal intensity that second community brings first community, so as to Again the interference signal after pre- elimination is eliminated by AF panel folding, due to dry Disturb second community in the pre- elimination signal of interference obtained by carrying out after pre- elimination and bring the dry of first community Signal strength weakening is disturbed, interference is done further according to the interference pre- channel response estimate for eliminating signal Further eliminate, improve the accuracy of the pre- channel response estimate for eliminating signal of interference, from And preferably interference can be eliminated or suppressed, reduce the up mistake of the first communication system Code check is so as to improve the up throughput of the first communication system.

The embodiment of the present invention provides a kind of interference blanking unit, each in the interference blanking unit Functional unit is corresponding with interference blanking unit method in above-described embodiment, specifically may be referred to this Description in invention above-described embodiment, the embodiment of the present invention will not be described here.As shown in fig. 6, The interference blanking unit, is applied to first community, and the first community has adjacent area second community, Wherein, the first community belongs to the first communication system, and the second community belongs to the second communication There is shared frequency spectrum in system, the first community and second community, described device includes：

Interference is pre- to eliminate unit 201, for the first community base station to the up letter that receives Number, carried out disturbing pre- elimination according to preset strategy, obtain disturbing pre- elimination signal；Wherein, institute State the first upward signal that upward signal sends including user equipment 1 in the first community and The second upward signal that user equipment 2 sends in the second community；

Interference cancellation unit 202, for being estimated according to the pre- channel response for eliminating signal of the interference Value, the signal that eliminates pre- to the interference carries out interference elimination.

The embodiment of the present invention provides a kind of interference blanking unit, and the embodiment of the present invention is by judging the The energy value of two cells carries out disturbing pre- elimination so as to choose suitable preset strategy, due to Two cells select to preset to the interference signal that first community is brought according to the energy value of second community Strategy, can effectively weaken the interference signal intensity that second community brings first community, so as to Again the interference signal after pre- elimination is eliminated by AF panel folding, due to dry Disturb second community in the pre- elimination signal of interference obtained by carrying out after pre- elimination and bring the dry of first community Signal strength weakening is disturbed, interference is done further according to the interference pre- channel response estimate for eliminating signal Further eliminate, improve the accuracy of the pre- channel response estimate for eliminating signal of interference, from And preferably interference can be eliminated or suppressed, reduce the up mistake of the first communication system Code check is so as to improve the up throughput of the first communication system.

Optionally, as shown in fig. 7, the interference is pre- to eliminate unit 201, also include：

Acquiring unit 203, for obtaining the energy value of second upward signal；

Judging unit 204, for judging the energy value of second upward signal whether more than first Thresholding, determines that the energy value of second upward signal is more than first in the judging unit 204 After thresholding, it is upper that the pre- base station for eliminating 201 pairs of first communities of unit of the interference receives Row signal, carries out disturbing pre- elimination according to preset strategy, obtains disturbing pre- elimination signal.

Preferably, as shown in fig. 7, the acquiring unit 203, including：

Acquisition module 2031, for obtaining the frequency of the second community；

Computing module 2032, carries for calculating M comprising second community frequency The energy of ripple, obtains the energy value of second upward signal, wherein, 12≤M≤60.

Wherein, it is preferred that the M subcarrier is included with the frequency of second communication system Centered on choose 12 subcarriers.

Preferably, the acquisition module 2031 specifically for：

Receive the frequency of the second community that Eco sends.

Optionally, as shown in figure 8, the pre- unit 201 that eliminates of the interference includes that first eliminates in advance The pre- cancellation module 2012 of module 2011 and second；

It should be noted that the pre- unit 201 that eliminates of the interference can only include the first pre- elimination Module 2011, it is also possible to only include the second pre- cancellation module, as shown in Figure 9, it is also possible to while Comprising the first pre- cancellation module and the second pre- cancellation module, can be according in specific implementation process The energy value of two upward signals is configured, and embodiment of the present invention here is no longer limited.

The first pre- cancellation module 2011 is used to perform the first preset strategy；

As shown in figure 9, the first pre- cancellation module 2011 is specifically included：First reconstructed module, Build for the interference signal in the upward signal that receives the base station of the first community For statistical model；Interference reconstruct is carried out to the statistical model；First offsets module, for The interference signal after reconstruct is offseted in frequency domain；

As shown in figure 9, the second pre- cancellation module is specifically included：Second reconstructed module, uses The original ratio after soft bit or decoding after the demodulation that the base station for receiving the second community sends Spy's stream, and the interference letter in the upward signal received according to the base station of the first community Number channel information to the soft bit after demodulation or decoding after original bit stream carry out interference weight Structure；Second offsets module, for offseting to the interference signal after reconstruct in frequency domain.

Preferably, the judging unit 204 is additionally operable to：Judge the energy of the M subcarrier Whether value is less than the second thresholding more than the first thresholding；

The pre- unit 201 that eliminates of the interference is also particularly useful in the energy of the M subcarrier Value, less than after the second thresholding, is entered more than the first thresholding according to the described first pre- cancellation module 2011 Row interference is pre- to be eliminated, and obtains disturbing pre- elimination signal；

The pre- unit 201 that eliminates of the interference is also particularly useful in the energy of the M subcarrier Value carries out disturbing pre- more than after second thresholding according to the described second pre- cancellation module 2012 Eliminate, obtain disturbing pre- elimination signal.

Preferably, first reconstructed module 20121 specifically for：

In order to reduce the complexity of interference blanking unit, can will be described in actual mechanical process Interference coefficient matrix H is precalculated according to the spectral characteristic of second community, is stored in memory In, when needed can be by reading storage numerical value in which memory, the memory can With including volatile memory (English：Volatile memory), such as random access memory (English Text：Random-access memory, abbreviation：RAM)；The memory can also include non- Volatile memory (English：Non-volatile memory), such as read-only storage (English： Read-only memory, abbreviation：ROM), flash memory (English：Flash memory), Hard disk (English：Hard disk drive, abbreviation：HDD) or solid state hard disc (English：solid-state Drive, abbreviation：SSD)；The memory can also include the combination of the memory of mentioned kind, Exemplary, the memory of the embodiment of the present invention selects random access memory.

Preferably, second reconstructed module 20121 specifically for：

Wherein it is possible to the institute that the base station for estimating the first community in the following manner receives The channel information of the interference signal in upward signal is stated, for example：Three kinds based on LTE system are Know channel model, for example, ETU, EVA, EPA draws three kinds of channel informations, and by three kinds Channel information is stored in memory, and then first community expands according to the time delay that LTE system is measured Exhibition value, the letter of interference signal in the upward signal received to the first community is needed Road information directly reads storage channel information in which memory when being estimated.It is described to deposit Reservoir can include volatile memory (English：Volatile memory), such as arbitrary access is deposited Reservoir (English：Random-access memory, abbreviation：RAM)；The memory also may be used With including nonvolatile memory (English：Non-volatile memory), such as read-only storage (English：Read-only memory, abbreviation：ROM), flash memory (English：flash Memory), hard disk (English：Hard disk drive, abbreviation：HDD) or solid state hard disc (English： Solid-state drive, abbreviation：SSD)；The memory can also include the storage of mentioned kind The combination of device, exemplary, the memory of the embodiment of the present invention selects random access memory.

Preferably, described first offset module 20112 and second and offset module 20122 and specifically use In：

It should be noted that in specific implementation process, module 20112 can be offseted by first Module 20122 is offseted with second be arranged to an interference cancellation module.

Preferably, the computing module 2032 specifically for：

Preferably, the interference blanking unit 20 also includes time-domain windowed unit, and the time domain adds Window module specifically for：

Each OFDM symbol in upward signal is carried out into time-domain windowed；

Preferably, the interference blanking unit 20 also includes, frequency domain converting unit, for by Row signal carries out frequency domain conversion.

Finally it should be noted that：Above example only to illustrate technical scheme, and It is non-that it is limited；Although being described in detail to the present invention with reference to the foregoing embodiments, ability The those of ordinary skill in domain should be understood：It still can be to the skill described in foregoing embodiments Art scheme is modified, or carries out equivalent to which part technical characteristic；And these are repaiied Change or replace, the essence for not making appropriate technical solution departs from various embodiments of the present invention technical side The spirit and scope of case.

Claims

1. a kind of interference elimination method, it is characterised in that methods described is applied to first community, The first community has adjacent area second community, wherein, the first community belongs to the first communication System, the second community belongs to the second communication system, the first community and described second little There is shared frequency spectrum in area, methods described includes：

2. method according to claim 1, it is characterised in that in the first community Base station carries out disturbing pre- elimination to the upward signal for receiving according to preset strategy, obtains interference pre- Before eliminating signal, methods described also includes：

Obtain the energy value of second upward signal；

3. method according to claim 2, it is characterised in that the acquisition described second The energy value of upward signal includes：

Obtain the frequency of the second community；

4. method according to claim 3, it is characterised in that the M subcarrier bag Containing 12 subcarriers chosen centered on the frequency of second communication system.

5. the method according to claim 3 or 4, it is characterised in that described in the acquisition The frequency of second community, including：

6. method according to claim 3, it is characterised in that the preset strategy includes： First preset strategy or the second preset strategy, wherein,

7. method according to claim 6, it is characterised in that the base of the first community Stand to the upward signal for receiving, carried out disturbing pre- elimination according to preset strategy, obtain disturbing and disappear in advance Except signal, including：

8. the method according to claim 6 or 7, it is characterised in that described by described Interference signal in the upward signal that the base station of one cell receives is configured to statistical model, Interference reconstruct is carried out to the statistical model, including：

X = {[x (n_{c} - \frac{M}{2} + 1), x (n_{c} - \frac{M}{2} + 2), ..., x (n_{c}), x (n_{c} + 1), x (n_{c} + 2), ..., x (n_{c} + \frac{M}{2})]}^{T};

9. the method according to claim 6 or 7, it is characterised in that described in the basis The channel information of interference signal is to demodulation in the upward signal that the base station of first community receives Original bit stream after rear soft bit or decoding carries out interference reconstruct, including：

Estimate interference signal in the upward signal that the base station of the first community receives Channel information；

10. the method according to any one of claim 6-9, it is characterised in that described in frequency The interference signal after reconstruct is offseted in domain, including：

11. methods according to claim 3, it is characterised in that the calculating includes institute The energy value of M subcarrier of second community frequency is stated, including：

According to formula

R S S I = | x (n_{c} - \frac{M}{2} + 1) |^{2} + | x (n_{c} - \frac{M}{2} + 2) |^{2} + ... + | x (n_{c}) |^{2} + | x (n_{c} + 1) |^{2} + | x (n_{c} + 2) |^{2} + ... + | x (n_{c} + \frac{M}{2}) |^{2}

Meter Calculate the energy value of the M subcarrier comprising the second community frequency；Wherein, n_cFor described second Cell carrier is mapped to the index of the first community subcarrier, and RSSI is the M subcarrier Energy value.

12. methods according to claim 1, it is characterised in that in the first community Base station to receive upward signal, carried out disturbing pre- elimination according to preset strategy, disturbed It is pre- to eliminate before signal, including：

Each OFDM symbol in upward signal is carried out into time-domain windowed；

13. a kind of interference blanking units, it is characterised in that described device is applied to first community, The first community has adjacent area second community, wherein, the first community belongs to the first communication System, the second community belongs to the second communication system, and the first community and second community are deposited In shared frequency spectrum, described device includes：

14. devices according to claim 13, it is characterised in that described device also includes：

Acquiring unit, for obtaining the energy value of second upward signal；

The pre- unit that eliminates of the interference in the judging unit specifically for determining on described second , more than after the first thresholding, the pre- unit that eliminates of the interference is to described first for the energy value of row signal The upward signal that the base station of cell receives, carries out disturbing pre- elimination according to preset strategy.

15. devices according to claim 14, it is characterised in that the acquiring unit, Including：

Acquisition module, for obtaining the frequency of the second community；

16. devices according to claim 15, it is characterised in that the M subcarrier Comprising 12 subcarriers chosen centered on the frequency of second communication system.

17. devices according to claim 15 or 16, it is characterised in that the acquisition Module specifically for：

Receive the frequency of the second community that telegon sends.

18. devices according to claim 15, it is characterised in that the interference is eliminated in advance Unit includes the first pre- cancellation module or the second pre- cancellation module, and the first pre- cancellation module is used In performing the first preset strategy；

19. devices according to claim 18, it is characterised in that the judging unit is also For：Whether the energy value for judging the M subcarrier is less than the second thresholding more than the first thresholding；

20. devices according to claim 18 or 19, it is characterised in that described first Reconstructed module specifically for：

X = {[x (n_{c} - \frac{M}{2} + 1), x (n_{c} - \frac{M}{2} + 2), ..., x (n_{c}), x (n_{c} + 1), x (n_{c} + 2), ..., x (n_{c} + \frac{M}{2})]}^{T};

21. devices according to claim 18 or 19, it is characterised in that described second Reconstructed module specifically for：

According to reconstruction formula y=R*h to the original bit after the soft bit after the demodulation or decoding Stream is reconstructed Y₂, wherein, h is K*M rank interference coefficient matrixes, and K is the son load for needing to offset The quantity of ripple.

22. devices according to any one of claim 18-21, it is characterised in that described One offset module and second offset module specifically for：

When the carrier wave of the second community is in the left side of the first community central subcarrier, According to formula k=n_c+L,...,n_c+ L+K-1 is eliminated to the interference signal after the reconstruct；Its In, k=n_c+L,...,n_c+L+K-1；Y is the interference signal after reconstruct, takes from Y₁Or Y₂；K is to need The quantity of the subcarrier to be offseted；L is to need first subcarrier for offseting little apart from described second The distance of district center frequency；

23. devices according to claim 15, the computing module specifically for：

According to formula

R S S I = | x (n_{c} - \frac{M}{2} + 1) |^{2} + | x (n_{c} - \frac{M}{2} + 2) |^{2} + ... + | x (n_{c}) |^{2} + | x (n_{c} + 1) |^{2} + | x (n_{c} + 2) |^{2} + ... + | x (n_{c} + \frac{M}{2}) |^{2}

24. devices according to claim 13, described device also includes time-domain windowed unit, The time-domain windowed unit specifically for：

Each OFDM symbol in upward signal is carried out into time-domain windowed；