CN101453228A - Common station address interference elimination system and method - Google Patents
Common station address interference elimination system and method Download PDFInfo
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- CN101453228A CN101453228A CNA2007101620868A CN200710162086A CN101453228A CN 101453228 A CN101453228 A CN 101453228A CN A2007101620868 A CNA2007101620868 A CN A2007101620868A CN 200710162086 A CN200710162086 A CN 200710162086A CN 101453228 A CN101453228 A CN 101453228A
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Abstract
The invention relates to a system and a method for eliminating common station site interference. The system comprises a first coupler, a transmission unit, an adjustment unit, an offset unit and a detection control unit, wherein the first coupler is used for extracting a signal transmitted by an interference base station as an interference offset signal, and coupling the interference offset signal to the transmission unit; the transmission unit is used for transmitting the interference offset signal to the adjustment unit; the adjustment unit is used for carrying out time delay, amplitude and phase adjustment of the interference offset signal to ensure that the interference offset signal and an interference signal received by a receiver from the interference base station through a wireless path have identical amplitudes and 180-degree phase difference; the offset unit is used for adding the interference offset signal adjusted by the adjustment unit to the interference signal received by the receiver from the interference base station, thereby offsetting the interference signal from the interference base station; and the detection control unit is used for controlling the adjustment unit to carry out time delay, amplitude and phase adjustment of the interference offset signal according to the interference signal received by the receiver from the interference base station.
Description
Technical field
The present invention relates to interference cancelling system and method in the wireless communication field, particularly, relate to interference cancelling system and method that the inhibition in the radio receiver is disturbed, and in interference cancelling system employed radiofrequency signal fiber transmission device, can suppress in the base station interference signal from colocation site or adjacent cell base station.
Background technology
Along with development of wireless communication devices, the environment of radio communication is ubiquitous.Different wireless communication systems is distinguished according to different system standard and is coexisted.In addition, different standards has also defined the use characteristic of different system, for example, and frequency range, access technology, networking mode or the like.With the cellular mobile communication is example, comprising GSM, PHS, CDMA, the WCDMA, the TD-SCDMA that also have 3G (Third Generation) Moblie, CDMA2000 or the like.Yet, under the situation of this colocation site, the restriction that wireless communication system is interfered.Interference can have a strong impact on the quality of service of whole system, the performance of reduction capacity and covering, even cause communication to stop.
The form of disturbing comprises the interference (ACI) of disturbing (MAI) and adjacent channel from the multiple access of the same sub-district of native system or adjacent cell, from the external disturbance of other communication systems of working in same frequency band or other frequency bands.For example, GSM and PHS system also may cause interference to the WCDMA system.And from the interference of the non-linear and non-ideal factor of the transmitter of homologous ray or other system.
Because the extensive use of wireless communication system, frequency resource day is more in short supply, and the protection frequency band between the different communication systems is very little or almost do not have.In addition, in order to reduce investment, need make full use of the basic resource of existing network.In addition, the various wireless communication system need cover common zone.In this case, when disposing different communication systems, have to select colocation site or close on the site and come mounted base station.This can cause from same frequency band or face the colocation site of working in the frequency band mutually or close on mutual external disturbance between the base station of different system of site.
Fig. 1 shows the block diagram of wireless communication system of the prior art.As shown in Figure 1, wireless communication system comprises second base station 100 and receiver 102.Receiver 102 comprises antenna 101, radio frequency band filter 103, low noise amplifier 104, frequency converter 105, if bandpas filter 106, intermediate frequency amplifier 107, analog to digital converter 108, and baseband processing unit 109.
In the course of the work, the antenna 101 of receiver is 100 received signals from the base station, and the signal that is received is delivered to radio frequency band filter 103.Radio frequency band filter 103 filtering is to received signal passed through the signal of required channel in the whole frequency acceptance band, suppresses the interference of image signal.The signal of process bandpass filtering is sent to low noise amplifier 104 and amplifies.Be provided for frequency converter 105 through amplifying signal.Frequency converter 105 is transformed into intermediate frequency (IF) signal with radiofrequency signal, and intermediate-freuqncy signal is input to if bandpas filter 106, carries out the midband pass filter by 106 pairs of IF signals of if bandpas filter.Signal through IF filtering is sent to intermediate frequency amplifier 107.After 107 pairs of IF signals of intermediate frequency amplifier amplify, offer analog to digital converter 108.Analog to digital converter 108 becomes digital signal with analog signal conversion, utilizes digital processing technology then, at numeric field signal is handled.Digitized signal is provided for baseband processing unit 109.At last, by baseband processing unit 109 signal that receives is reverted to primary signal.
Fig. 9 shows the external disturbance schematic diagram that faces the colocation site base station of work in the frequency band mutually.In Fig. 9, the working band of the colocation site signal of base station of other communication system of work in the frequency band is faced in reference marker 801 expressions mutually.The working band of the received signal of base station in the reference marker 802 expression native systems.Because the working band 801 of the colocation site base station of other communication system is very near apart from the working band 802 of the base station of native system, so can cause interference to working band 802.
Here, to be one or more base stations cause powerful signal to disturb to another base station in described interference, makes the receiver of another base station get clogged and can't operate as normal.For example, in WCDMA up link (UL) frequency band, from another cellular system (for example, GSM or PHS system) colocation site or the external disturbance (EI) of adjacent cells can dwindle cell footprint significantly, even cause whole or most of users in the described sub-district to lose the connection of up link.For ever-increasing contradiction between the demand of non-renewable and people that solves frequency resource, several eliminations have been proposed with frequency band or face the colocation site in the frequency band mutually or close on the method for disturbing between the site in the prior art to wireless communication system.
A kind of method of the prior art is the distance between two colocation sites of increase or the base station of closing on the site, or the barrier that increases between the base station reduces interference signal.Yet the method for two site distances of increase can't satisfy the covering demand in the traffic hotspots area probably, and the addressing engineering that grid is disposed causes very big difficulty simultaneously, even can't realize.
Another kind method is to improve the outer inhibit feature of band of receiver radio frequency band pass filter 103, to reduce the obstruction of interference signal to receiver.Yet the outer inhibit feature of band that increases filter must increase the exponent number of filter, thereby has increased cost and volume.In addition, the in-band insertion loss of filter also increases thereupon, causes the decline of important performances such as passband fluctuation and time delay.In addition, actual filter has certain transition band, and especially the transition band of radio-frequency filter is more slow, so that be difficult to the interference signal of adjacent frequency bands is played bigger inhibitory action.Therefore, improving the outer method that suppresses of filter band can not reduce very effectively with the colocation site of working in the frequency band or the interference signal of closing on the site.
Another method is to improve the noise immunity of receiver.This method is to operate accordingly according to the power level of detected received signal.If power satisfies or surpass predetermined power threshold, bypass low noise amplifier 104 (referring to Fig. 1) then improves the noise immunity of receiver by the capture point that improves receiver components.Therefore, in fact the method for bypass low noise amplifier does not reduce interference signal itself, but prevents the saturation jamming of strong jamming to radio circuit passively.This method does not improve the signal to noise ratio of receiver, and the bypass low noise amplifier also can reduce the receiving sensitivity of receiver.
Summary of the invention
In view of the above problems, the purpose of this invention is to provide a kind of interference cancelling system and method, be used to improve the anti-interference of receiver energy.Interference cancelling system of the present invention and method are by the radiofrequency signal of the interference base station of extraction colocation site or adjacent cell, the radio signal transmission of extracting is arrived this base station, offset the interference signal that this base station receiver receives through time delay, amplitude and the phase place of adjusting the radiofrequency signal of extracting.
According to an aspect of the present invention, provide a kind of interference cancelling system, comprising: first coupler, be used to extract the signal of interference base station emission, as interference-cancelled signals, and interference-cancelled signals is coupled to transmission unit; Transmission unit is used for interference-cancelled signals is transferred to adjustment unit; Adjustment unit is used for interference-cancelled signals is carried out time delay, amplitude and phase place adjustment, makes that the amplitude of the interference signal that interference-cancelled signals and receiver receive from described interference base station by wireless path is identical, 180 ° of phase phasic differences; Offset unit be used for the interference signal addition that interference-cancelled signals that described adjustment unit is adjusted and described receiver receive from described interference base station, thereby counteracting is from the interference signal of described interference base station; Detect control unit, be used for controlling described adjustment unit interference-cancelled signals being carried out time delay, amplitude and phase place adjustment according to the interference signal of described receiver from described interference base station reception.
According to another aspect of the present invention, provide a kind of interference elimination method, comprise step: extract the signal of interference base station emission from interference base station,, and interference-cancelled signals is coupled to is transferred to adjustment unit as interference-cancelled signals; Interference-cancelled signals is carried out time delay, amplitude and phase place adjustment, make that the amplitude of the interference signal that interference-cancelled signals and receiver receive from described interference base station by wireless path is identical, 180 ° of phase phasic differences; Will be through interference-cancelled signals of adjusting and the interference signal addition that receives from described interference base station, thus offset interference signal from described interference base station; Wherein detect the interference signal that control unit receives from described interference base station according to described receiver, time delay, amplitude and phase place adjustment that control is carried out interference-cancelled signals.
According to the present invention, arrive this base station by the radio signal transmission that the interference base station of colocation site or adjacent cell is launched, the radiofrequency signal of transmitting is carried out time delay, amplitude and phase place to be adjusted, the amplitude of radiofrequency signal that makes the interference base station emission that itself and this base station receive by wireless path is identical and phase place is opposite, thereby offsets the interference that interference base station produces this base station.
According to the present invention, the radiofrequency signal of the interference base station by offsetting colocation site or adjacent cell is eliminated the interference of colocation site or adjacent cell.Thereby reduced the requirement of the dynamic property of the linear properties of band outside inhibitory energy, amplifier, frequency mixer and analog to digital converter to the analog link median filter.The phase mutual interference that the present invention can be used for two and two above system colocation sites suppresses.
Description of drawings
By below in conjunction with description of drawings the preferred embodiments of the present invention, will make above-mentioned and other purpose of the present invention, feature and advantage clearer, wherein:
Fig. 1 shows the block diagram of wireless communication system of the prior art;
Fig. 2 shows the block diagram that has according to the interference cancelling system of the embodiment of the invention;
Fig. 3 shows an example according to the transmission unit in the interference cancelling system of the present invention;
Fig. 4 shows an example according to the offset unit in the interference cancelling system of the present invention;
Fig. 5 shows an example according to the adjustment unit in the interference cancelling system of the present invention;
Fig. 6 shows another example according to the adjustment unit in the interference cancelling system of the present invention;
Fig. 7 shows another example according to the adjustment unit in the interference cancelling system of the present invention;
Fig. 8 shows according to the embodiment of the invention under many base station interference situation, the configuration block diagram of interference cancelling system; With
Fig. 9 shows the external disturbance schematic diagram that faces the colocation site base station of work in the frequency band mutually.
Embodiment
Embodiments of the present invention is described in detail with reference to the accompanying drawings, and having omitted in the description process is unnecessary details and function for the present invention, obscures to prevent that the understanding of the present invention from causing.
Below with reference to Fig. 2 interference cancelling system is according to an embodiment of the invention described.Fig. 2 shows the block diagram according to the interference cancelling system of the embodiment of the invention.In Fig. 2, reference number 100 expressions are as second base station of the colocation site or the adjacent cell of interference base station, and receiver 102 is the receivers in this base station (or being called first base station).Be noted that parts same as shown in Figure 1 among Fig. 2 are by identical referential expression.Identical with the receiver of prior art shown in Figure 1, receiver in the interference cancelling system of present embodiment comprises antenna 101, radio frequency band filter 103, low noise amplifier 104, frequency converter 105, if bandpas filter 106, intermediate frequency amplifier 107, analog to digital converter 108, and baseband processing unit 109.In addition, receiver 102 also comprises offset unit 204, be arranged on as the transmission unit 202 between the receiver 102 of second base station 100 of interference source and this base station, and adjustment unit 203, and detect control circuit 205.In addition, in order from second base station 100, to obtain the radiofrequency signal of interference base station emission, in second base station 100, be provided with coupler 201.Coupler 201 links to each other with transmission unit 202.Coupler 201 (can be used as first coupler) extracts the radiofrequency signal of emission in second base station 100, and this signal is delivered to transmission unit 202.
In the present embodiment, the interference with colocation site or adjacent cell base station is the elimination that example is come the description disturbance signal.Be noted that to the invention is not restricted to this, also can be applied to other the base station set-up mode and other need eliminate the equipment of interference.In addition, adjustment unit 203 and detection control unit 205 can be arranged on the inside that needs to eliminate this base station of disturbing, and also can be arranged on the outside of this base station, for example, are set together with transmission unit 202, or are arranged in 202 minutes with transmission unit.
Radiofrequency signal by second base station 100 of coupler 201 output is sent to adjustment unit 203 through transmission unit 202.The radiofrequency signal of second base station 100 of 203 pairs of receptions of adjustment unit is carried out time delay, amplitude and phase place adjustment, make the amplitude of the interference signal that receives from second base station 100 in signal and the receiver 102 of adjustment unit 203 output identical, 180 ° of phase phasic differences, offset from the interference signal of second base station, 100 receptions thereby become receiver 102.Be sent to offset unit 204 through the signal of adjusting.The interference signal addition that offset unit 204 will receive from second base station 100 from the interference-cancelled signals and the receiver 102 of adjustment unit 203 receptions, thus counteracting is from the interference signal of intervention second base station 100 of colocation site or adjacent cell.Be noted that before the interference signal that receiver 102 receives from second base station 100 is sent to offset unit 204.Radio frequency band filter 103 in the receiver 102, low noise amplifier 104 respectively the interference signal that receives from second base station 100 are carried out the radio frequency bandpass filtering and low noise amplifies.The operation of radio frequency band filter 103 and low noise amplifier 104 with top with reference to figure 1 describe identical.For simplicity, omit description of them at this.
Start working the stage at whole interference blanking unit, baseband processing unit 109 offers the digital baseband signal after the demodulation and detects control unit 205.Detection control unit 205 detects interference signal according to the spectrum component of resulting digital baseband signal, and control time delay, amplitude and the phase place that adjustment unit 203 changes the radiofrequency signal that transmission units 201 provide according to detected interference signal, up to reaching optimum neutralization effect.Detect control unit 205 and can adopt the method such as trial-and-error method or quick dichotomy to control time delay, amplitude and the phase place that adjustment unit 203 changes the signal that is used to offset, so that obtain optimum neutralization effect.Form a closed loop owing to detect control unit 205 with baseband processing unit 109, so detection control unit 205 can be in real time and controlled adjustment unit 203 rapidly and accurately and adjust the time delay of offseting signal, amplitude and phase place.
In the present embodiment, coupler 201 can be directional coupler or power division coupler.The radiofrequency signal of coupler 201 outputs is sent to adjustment unit 203 by transmission unit 202, as interference-cancelled signals.
Fig. 3 shows an example of the configuration of transmission unit 202.Transmission unit 202 is connected between coupler 201 and the adjustment unit 203.Transmission unit 202 comprises electrical optical converter 301, transmitting device 302 and photoelectric transformer 303.Transmission path 302 can adopt equipment such as radio frequency coaxial-cable or analog optical fiber transmission circuit.Be noted that to the invention is not restricted to this, also can adopt other transmission equipment as signal transmitting apparatus.
Fig. 3 shows and adopts the example of analog optical fiber transmission circuit as transmitting device 302.In transmission unit 202, electrical optical converter 301 is modulated into light signal to the radiofrequency signal from coupler 201 outputs, and the light signal of modulation is transferred to photoelectric transformer 303 by transmitting device 302.The radiofrequency signal that photoelectric transformer 303 demodulation from light signal is original.This radiofrequency signal is provided for adjustment unit 203, as interference-cancelled signals.Use the analog optical fiber transmission can reduce the middle signal energy loss of transmission course, make the acquisition of interference-cancelled signals keep higher precision.
An example of adjustment unit 203 is described below with reference to Fig. 5.As shown in Figure 5, modulating unit 203 comprises delay adjusting unit 503, amplitude adjustment unit 504 and phasing unit 505.Deliver to delay adjusting unit 503 (can be used as the first delay adjusting unit) from the interference-cancelled signals that transmission unit 202 sends.Delay adjusting unit 503 changes the time delay of interference-cancelled signals under the control that detects control unit 205, make the time delay of interference-cancelled signals identical from the time delay of the interference radiofrequency signal of interference base station reception by wireless path with first receiver 102.Signal through delay adjusting is sent to amplitude adjustment unit 504.Amplitude adjustment unit 504 is adjusted the amplitude of interference-cancelled signals under the control that detects control unit 205, make the amplitude of interference-cancelled signals identical from the amplitude of the interference radiofrequency signal of interference base station reception by wireless path with first receiver 102.The output of amplitude adjustment unit 504 offers phasing unit 505.Phasing unit 505 is adjusted the phase place of interference-cancelled signals under the control that detects control unit 205, make the phase place of interference-cancelled signals opposite from the phase place of the interference radiofrequency signal of interference base station reception by wireless path with first receiver 102.
Interference-cancelled signals through time delay, amplitude and phase place adjustment is sent to offset unit 204.In this case, offset unit 204 can be arranged on any position between antenna 101 and the frequency converter 105, the interference-cancelled signals that will obtain by transmission unit 202 and receiver superpose by the interference signal from the interference base station of colocation site or adjacent cell that wireless path receives, the realization interference signal is offset at rf frequency, thereby eliminates the interference signal from the interference base station of colocation site or adjacent cell.
Fig. 4 shows the configuration schematic diagram of offset unit 204.Offset unit 204 comprises delay adjusting unit 401 (can be used as the second delay adjusting unit) and coupler 402 (can be used as second coupler).The time delay from the interference signal of the interference base station of colocation site or adjacent cell that receives by wireless path is regulated in delay adjusting unit 401 under the control that detects control unit 205, make it identical with the time delay of interference-cancelled signals of delay adjusting unit 503 adjustings in the adjustment unit 203.The interference signal that coupler 402 will receive by wireless path offsets with the interference-cancelled signals from adjustment unit 203, thereby has eliminated the interference signals of the interference base station of colocation site or adjacent cell to band pass filter 106 outputs.Delay adjusting unit 401 in the bucking circuit 204 matches with delay adjusting unit 503 in the adjustment unit 203, make 180 ° of the phasic differences mutually of the interference signal that arrives coupler 402 and interference-cancelled signals, thereby the elimination interference signal, and the received signal that will eliminate interference signal is delivered to frequency converter 105.
In example shown in Figure 5, the interference-cancelled signals that adjustment unit 203 outputs to offset unit 204 is a radiofrequency signal.Offset unit 204 can be arranged on any position between antenna 101 and the frequency converter 105.As an alternative, second frequency converter 502 can be set in adjustment unit 203, to be down-converted to intermediate-freuqncy signal from the interference-cancelled signals that transmission unit 202 sends, and after regulating respectively through time delay, amplitude and the phase place of delay adjusting unit 503, amplitude adjustment unit 504 and 505 pairs of intermediate-freuqncy signals of phasing unit, deliver to Interference Cancellation circuit 204 again.In this case, bucking circuit 204 can be in any position between first frequency converter 105 and the analog to digital converter ADC108, thereby realizes the counteracting of interference signal in IF-FRE.
Fig. 6 shows the schematic diagram that second frequency converter 502 is set in adjustment unit 203.As shown in Figure 6, the interference-cancelled signals that sends from transmission unit 202 is down converted to intermediate-freuqncy signal second frequency converter 502.The reference signal of local oscillation signal of carrying out down-conversion as second frequency converter 502 makes that from interference base station 100 intermediate-freuqncy signal after the frequency conversion reaches fully synchronously with the interference signal that receives.
Fig. 7 shows another example according to the adjustment unit in the interference blanking unit of the present invention.The difference of example shown in Figure 7 and example shown in Figure 6 is to have added digital to analog converter 501 in adjustment unit 203.In this case, can extract digital baseband signal from interference base station.In this example, coupler 201 is isolated the digital baseband signal of interference base station from be arranged on interference base station 100, is transferred to adjustment unit 203 through transmission unit 202.In adjustment unit 203, digital to analog converter (DAC) 501 is transformed into analog baseband signal with the digital baseband signal that transmission unit 202 sends.Second frequency converter 502 becomes to offset the radiofrequency signal or the intermediate-freuqncy signal of usefulness to analog baseband signal modulation frequency conversion.After this, identical with foregoing process, by delay adjusting unit 503, the radiofrequency signal of amplitude adjustment unit 504 and 505 pairs of counteracting usefulness of phasing unit or time delay, amplitude and the phase place of intermediate-freuqncy signal are adjusted, make that the amplitude of the interference signal that receives in amplitude and the receiver 102 of interference-cancelled signals of adjustment unit 203 output is identical, 180 ° of phase phasic differences, and pass to addition in the offset unit 204, to offset interference signal from second base station 100 of colocation site or adjacent cell.Detect control circuit 205 and detect the amplitude of wanting repressed interference signal in real time, and control is adjusted circuit 203 and changed the time delay, amplitude and the phase place that are used for interference-cancelled signals and reach optimum neutralization effect according to the baseband signal of baseband processing unit 109 inputs.
In this example, coupler 201 can be the shunt circuit of a digital baseband signal, and the digital baseband signal that is used to launch in the interference base station 100 is gone out an identical part along separate routes as offseting signal.Simultaneously, the synchronizing clock signals of digital baseband signal is also come out along separate routes, is sent to adjustment unit 203 with digital baseband signal by transmission unit 202.Transmission unit 202 can be realized by the digital fiber transmitting device, as shown in Figure 3.The concrete enforcement of transmission unit 202 can be by electrical optical converter 301 digital baseband signal of coupler 201 outputs to be modulated into light signal, delivers to photoelectric transformer 303 through fiber transmission device 302.Photoelectric transformer 303 demodulates original digital baseband signal and synchronizing clock signals to light signal.
Describe receiver above and be subjected to the situation that an interference base station disturbs.Be noted that to the invention is not restricted to this, also can be applied to the situation that the mutual inhibition of the colocation site base station of two and two above systems is disturbed.
Fig. 8 shows according to the embodiment of the invention under the situation of many base station interference, the configuration block diagram of interference cancelling system.In the present embodiment, except adding the 3rd base station 701, and be connected the 3rd base station 701 and detect outside the transmission unit 702 and adjustment unit 703 between the control unit 205, other configuration is with embodiment illustrated in fig. 2 identical.In the present embodiment, receiver 102 is subjected to the interference of two interference base stations (for example, 100,600).
In the present embodiment, second base station 100 and the 3rd base station 600 are colocation site or the interference base station that closes on the site with respect to first receiver 102.Use system of the present invention, extract the signal of second base station 100, deliver to adjustment unit 203 through transmission unit 202 and handle by coupler 201.By the signal that coupler 701 extracts from the 3rd base station 600, deliver to adjustment unit 703 through transmission unit 702 and handle.Then, close the road from the signal of adjustment unit 203 and adjustment unit 703 and send into addition in the bucking circuit 204, to offset interference signal from colocation site or adjacent cell second base station 100 and the 3rd base station 600.Wherein detect control circuit 205 and control adjustment circuit 203 respectively and adjust circuit 703, thereby independently change the neutralization effect that the time delay, amplitude and the phase place that are used for two different offseting signals reach optimum according to the real-time amplitude that detects repressed interference signal of the baseband signal of baseband processing unit 109 inputs.
The flow process of eliminating the method for adjacent base station interference signal according to the present invention is described below.At first, the radiofrequency signal of extracting adjacent interference base station is delivered to adjustment unit 203 through Optical Fiber Transmission unit 202.The radiofrequency signal of the interference base station of 203 pairs of receptions of adjustment unit is carried out time delay, amplitude and phase place adjustment, make the amplitude of the interference signal that signal and the receiver 102 of adjustment unit 203 output receive from interference base station by wireless path identical, 180 ° of phase phasic differences, thereby the interference signal addition that the offset unit in receiver 204 will receive from interference base station by wireless path from the interference-cancelled signals and the receiver of adjustment unit 203 receptions, thereby counteracting is from the interference signal of the interference base station of colocation site or adjacent cell.
Start working the stage at whole interference blanking unit, detection control unit 205 detects interference signal according to the spectrum component of resulting digital baseband signal, and control time delay, amplitude and the phase place that adjustment unit 203 changes the interference radiofrequency signal that transmission units 201 provide according to detected interference signal, up to reaching optimum neutralization effect.
According to above-described interference blanking unit of the present invention, the phase mutual interference that can be used for two and two above system colocation sites suppresses.These apparatus and method greatly reduce the cost and the design difficulty of base station system itself, the engineering design difficulty that the network planning is disposed when having reduced base station colocation site or adjacent cell simultaneously.Interference signal can be suppressed effectively, performance requirement can be reduced again key components in the analog link from colocation site or adjacent cell base station.
So far invention has been described in conjunction with the preferred embodiments.It should be appreciated by those skilled in the art that under the situation that does not break away from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, scope of the present invention should not be understood that to be limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (12)
1. interference cancelling system comprises:
First coupler is used to extract the signal of interference base station emission, as interference-cancelled signals, and interference-cancelled signals is coupled to transmission unit;
Transmission unit is used for interference-cancelled signals is transferred to adjustment unit;
Adjustment unit is used for interference-cancelled signals is carried out time delay, amplitude and phase place adjustment, makes that the amplitude of the interference signal that interference-cancelled signals and receiver receive from described interference base station by wireless path is identical, 180 ° of phase phasic differences;
Offset unit be used for the interference signal addition that interference-cancelled signals that described adjustment unit is adjusted and described receiver receive from described interference base station, thereby counteracting is from the interference signal of described interference base station;
Detect control unit, be used for controlling described adjustment unit interference-cancelled signals being carried out time delay, amplitude and phase place adjustment according to the interference signal of described receiver from described interference base station reception.
2. interference cancelling system according to claim 1, wherein said transmission unit are connected between described coupler and the described adjustment unit, and described transmission unit comprises:
Electrical optical converter is used for the interference-cancelled signals that described first coupler provides is modulated into light signal;
Transmitting device is used to transmit modulated light signal; With
Photoelectric transformer 3 is used for light signal is demodulated to original interference-cancelled signals, and offers described adjustment unit 203, as interference-cancelled signals,
Wherein said transmitting device is a fiber transmission device.
3. interference cancelling system according to claim 2, wherein said transmitting device are the injection high frequency coaxial cables.
4. interference cancelling system according to claim 1, wherein said modulating unit comprises:
The delay adjusting unit is used under the control of described detection control unit changing the time delay of interference-cancelled signals, makes the time delay of interference-cancelled signals identical from the time delay of the interference radiofrequency signal of described interference base station reception by wireless path with described receiver;
Amplitude adjustment unit, be used under the control of described detection control unit, adjusting the amplitude of described interference-cancelled signals, make the amplitude of described interference-cancelled signals identical by wireless path from the amplitude of the interference radiofrequency signal of described interference base station reception with described receiver;
Phasing unit, be used under the control of described detection control unit, adjusting the phase place of described interference-cancelled signals, make the phase place of described interference-cancelled signals opposite by wireless path from the phase place of the interference radiofrequency signal of described interference base station reception with described receiver.
5. interference cancelling system according to claim 1, wherein said first coupler are directional coupler or power division coupler.
6. interference cancelling system according to claim 1, wherein said offset unit comprises:
The second delay adjusting unit is used under the control of described detection control unit, matches with delay adjusting unit in the described modulating unit, makes 180 ° of the phasic differences mutually of the interference signal that arrives second coupler and interference-cancelled signals;
Second coupler is used for the interference signal that will receive by wireless path and offsets with interference-cancelled signals from described adjustment unit.
7. interference cancelling system according to claim 6, wherein said offset unit are arranged between the antenna and frequency converter of described reception.
8. interference cancelling system according to claim 1 comprises second frequency converter in the wherein said adjustment unit, be used for interference-cancelled signals is down-converted to intermediate-freuqncy signal.
9. interference cancelling system according to claim 8 comprises digital to analog converter in the wherein said adjustment unit, is used for converting the digital baseband signal of described interference-cancelled signals to analog baseband signal.
10. interference cancelling system according to claim 9, wherein said first coupler is the shunt circuit of digital baseband signal, be used for the digital baseband signal of described interference base station emission is gone out an identical part along separate routes as offseting signal, and the synchronizing clock signals of digital baseband signal offers described transmission unit with digital baseband signal along separate routes.
11. any one described interference cancelling system in 10 according to Claim 8, wherein said offset unit 204 are arranged between described first frequency converter and analog to digital converter in the described receiver.
12. an interference elimination method comprises step:
Extract the signal of interference base station emission from interference base station,, and interference-cancelled signals is coupled to is transferred to adjustment unit as interference-cancelled signals;
Interference-cancelled signals is carried out time delay, amplitude and phase place adjustment, make that the amplitude of the interference signal that interference-cancelled signals and receiver receive from described interference base station by wireless path is identical, 180 ° of phase phasic differences;
Will be through interference-cancelled signals of adjusting and the interference signal addition that receives from described interference base station, thus offset interference signal from described interference base station;
Wherein detect the interference signal that control unit receives from described interference base station according to described receiver, time delay, amplitude and phase place adjustment that control is carried out interference-cancelled signals.
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| CN 200710162086 CN101453228B (en) | 2007-12-04 | 2007-12-04 | Common station address interference elimination system and method |
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| CN 200710162086 CN101453228B (en) | 2007-12-04 | 2007-12-04 | Common station address interference elimination system and method |
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Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145143A1 (en) * | 2009-06-30 | 2010-12-23 | 中兴通讯股份有限公司 | Anti-interference method and apparatus for radio equipments in adjacent frequency bands |
| CN102594379A (en) * | 2012-02-21 | 2012-07-18 | 中兴通讯股份有限公司 | Phase-shifting filter device and application thereof |
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| CN104821832A (en) * | 2014-01-30 | 2015-08-05 | 亚德诺半导体集团 | Transmitter noise cancellation in a multi transmitter-receiver system |
| CN104883202A (en) * | 2014-02-27 | 2015-09-02 | 华为技术有限公司 | Method of reducing adjacent channel interference and relay equipment |
| WO2015196428A1 (en) * | 2014-06-26 | 2015-12-30 | 华为技术有限公司 | Interference cancellation device and method |
| US9831898B2 (en) | 2013-03-13 | 2017-11-28 | Analog Devices Global | Radio frequency transmitter noise cancellation |
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| US10050812B2 (en) | 2014-06-26 | 2018-08-14 | Huawei Technologies Co., Ltd. | Methods and apparatuses for interference cancellation |
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| CN110176943A (en) * | 2018-03-07 | 2019-08-27 | 中国电子科技集团公司第三十研究所 | A kind of short-wave reception is with road Suppression of narrow band interference system |
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| CN112736458A (en) * | 2020-12-16 | 2021-04-30 | 电子科技大学 | Multi-element array broadband decoupling network |
| CN112913149A (en) * | 2018-10-25 | 2021-06-04 | Oppo广东移动通信有限公司 | Apparatus and method for eliminating frequency interference |
| CN114499558A (en) * | 2022-02-16 | 2022-05-13 | 成都市联洲国际技术有限公司 | Same frequency interference cancellation device |
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| WO2010145143A1 (en) * | 2009-06-30 | 2010-12-23 | 中兴通讯股份有限公司 | Anti-interference method and apparatus for radio equipments in adjacent frequency bands |
| CN103106418A (en) * | 2011-11-15 | 2013-05-15 | 无锡旗连电子科技有限公司 | Radio frequency identification reader-writer |
| CN103106418B (en) * | 2011-11-15 | 2017-10-03 | 无锡旗连电子科技有限公司 | A kind of radio-frequency identification reader/writer |
| CN102594379A (en) * | 2012-02-21 | 2012-07-18 | 中兴通讯股份有限公司 | Phase-shifting filter device and application thereof |
| WO2013123705A1 (en) * | 2012-02-21 | 2013-08-29 | 中兴通讯股份有限公司 | Phase-shift filter device and application thereof |
| CN104521264A (en) * | 2012-06-06 | 2015-04-15 | 伊甸石通信股份有限公司 | Adjacent network aware self organizing network system |
| US9325437B2 (en) | 2012-12-18 | 2016-04-26 | Zte Corporation | Apparatus and method for detecting spectrum interference |
| CN103873162A (en) * | 2012-12-18 | 2014-06-18 | 中兴通讯股份有限公司 | Spectral interference detection device and method |
| WO2014094460A1 (en) * | 2012-12-18 | 2014-06-26 | 中兴通讯股份有限公司 | Apparatus and method for detecting frequency spectrum interference |
| CN103873162B (en) * | 2012-12-18 | 2016-02-10 | 中兴通讯股份有限公司 | Spectral interference checkout gear and method |
| US9831898B2 (en) | 2013-03-13 | 2017-11-28 | Analog Devices Global | Radio frequency transmitter noise cancellation |
| US10644731B2 (en) | 2013-03-13 | 2020-05-05 | Analog Devices International Unlimited Company | Radio frequency transmitter noise cancellation |
| CN103427872A (en) * | 2013-09-03 | 2013-12-04 | 电子科技大学 | Same-time same-frequency full duplex multi-tap radio frequency self-interference offset system and method |
| CN104821832A (en) * | 2014-01-30 | 2015-08-05 | 亚德诺半导体集团 | Transmitter noise cancellation in a multi transmitter-receiver system |
| CN104821832B (en) * | 2014-01-30 | 2018-08-10 | 亚德诺半导体集团 | Transmitter noise in transmitters-receiver system is offset |
| US10056962B2 (en) | 2014-02-27 | 2018-08-21 | Huawei Technologies Co., Ltd. | Method for reducing adjacent-channel interference and relay device |
| CN104883202A (en) * | 2014-02-27 | 2015-09-02 | 华为技术有限公司 | Method of reducing adjacent channel interference and relay equipment |
| CN104883202B (en) * | 2014-02-27 | 2018-05-29 | 华为技术有限公司 | A kind of method and trunking for reducing adjacent frequency interference |
| US9973224B2 (en) | 2014-06-26 | 2018-05-15 | Huawei Technologies Co., Ltd. | Interference cancellation apparatus and method |
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| WO2015196428A1 (en) * | 2014-06-26 | 2015-12-30 | 华为技术有限公司 | Interference cancellation device and method |
| US10084584B2 (en) | 2014-06-26 | 2018-09-25 | Huawei Technologies Co., Ltd. | Interference cancellation apparatus and method |
| CN106464284A (en) * | 2014-06-26 | 2017-02-22 | 华为技术有限公司 | Interference cancellation device and method |
| US10050812B2 (en) | 2014-06-26 | 2018-08-14 | Huawei Technologies Co., Ltd. | Methods and apparatuses for interference cancellation |
| RU2664392C2 (en) * | 2014-06-26 | 2018-08-17 | Хуавей Текнолоджиз Ко., Лтд. | Method and device for interference suppression |
| US9912358B2 (en) | 2015-03-20 | 2018-03-06 | Analog Devices Global | Method of and apparatus for transmit noise reduction at a receiver |
| CN107872236A (en) * | 2016-09-26 | 2018-04-03 | 波音公司 | The signal of frequency spectrum for checking another signal removes |
| CN110463047A (en) * | 2017-03-27 | 2019-11-15 | 库姆网络公司 | The system and method inhibited for tunable out-of-band interference |
| CN107634792A (en) * | 2017-09-04 | 2018-01-26 | 上海华为技术有限公司 | A kind of method, equipment and network equipment for accessing passback co-sited AF panel |
| CN108011644A (en) * | 2017-11-29 | 2018-05-08 | 浙江大华技术股份有限公司 | A kind of method and device for eliminating adjacent-channel interference |
| CN108011644B (en) * | 2017-11-29 | 2019-11-19 | 浙江大华技术股份有限公司 | A kind of method and device for eliminating adjacent-channel interference |
| CN110176943A (en) * | 2018-03-07 | 2019-08-27 | 中国电子科技集团公司第三十研究所 | A kind of short-wave reception is with road Suppression of narrow band interference system |
| CN112913149A (en) * | 2018-10-25 | 2021-06-04 | Oppo广东移动通信有限公司 | Apparatus and method for eliminating frequency interference |
| CN110445577A (en) * | 2019-06-27 | 2019-11-12 | 福建师范大学 | The system and method that a kind of edge resource multiplexing in heterogeneous network base station is eliminated with interference |
| CN110445577B (en) * | 2019-06-27 | 2021-09-03 | 福建师范大学 | System and method for edge resource reuse and interference elimination of heterogeneous network base station |
| CN110417428A (en) * | 2019-07-23 | 2019-11-05 | 北京航天广通科技有限公司分公司 | A kind of distribution radio frequency electric system and signal processing method |
| CN110417428B (en) * | 2019-07-23 | 2021-07-20 | 北京航天广通科技有限公司分公司 | Distributed radio frequency electronic system and signal processing method |
| CN112736458A (en) * | 2020-12-16 | 2021-04-30 | 电子科技大学 | Multi-element array broadband decoupling network |
| CN114499558A (en) * | 2022-02-16 | 2022-05-13 | 成都市联洲国际技术有限公司 | Same frequency interference cancellation device |
| CN114499558B (en) * | 2022-02-16 | 2024-01-16 | 成都市联洲国际技术有限公司 | Co-channel interference cancellation device |
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