CN101453228B - Common station address interference elimination system and method - Google Patents

Common station address interference elimination system and method Download PDF

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Publication number
CN101453228B
CN101453228B CN 200710162086 CN200710162086A CN101453228B CN 101453228 B CN101453228 B CN 101453228B CN 200710162086 CN200710162086 CN 200710162086 CN 200710162086 A CN200710162086 A CN 200710162086A CN 101453228 B CN101453228 B CN 101453228B
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China
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interference
signal
unit
base station
cancelled signals
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CN 200710162086
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Chinese (zh)
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CN101453228A (en
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陈康凯
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松下电器产业株式会社
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Publication of CN101453228B publication Critical patent/CN101453228B/en

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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

Common station address interference elimination system and method

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 the development of wireless communication technology, 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 etc.Take cellular mobile communication as example, comprising GSM, PHS, CDMA, the WCDMA, the TD-SCDMA that also have 3G (Third Generation) Moblie, CDMA2000 etc.Yet, in 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 residential quarter 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 guard band between the different communication systems is very little or almost do not have.In addition, in order to reduce investment, need to take full advantage of the basic resource of existing network.In addition, the various wireless communication system need to 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 mutually the colocation site of working in the frequency band 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 the 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 reception signals from the base station, and the signal that receives is delivered to radio frequency band filter 103.To received signal filtering of radio frequency band filter 103 is 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, then utilizes digital processing technology, at numeric field signal is processed.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 mutually the colocation site base station of work in the frequency band.In Fig. 9, the working band of the signal of the colocation site 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 reception 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, described interference is that one or more base stations cause powerful signal to disturb to another base station, so that the receiver of another base station gets clogged and can't work.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 significantly cell footprint, even cause whole or most of users in the described residential quarter to lose the connection of up link.For ever-increasing contradiction between the demand of non-renewable and people to wireless communication system that solves frequency resource, proposed several eliminations in the prior art with frequency band or face mutually the colocation site in the frequency band or close on the method for disturbing between the site.

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 probably can't satisfy the covering demand in the traffic hotspots area, and the addressing engineering of simultaneously grid being disposed causes very large difficulty, even can't realize.

Another kind method is to improve the Out-of-band rejection function of receiver radio frequency band pass filter 103, to reduce interference signal to the obstruction of receiver.Yet the Out-of-band rejection function 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 the 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 larger inhibitory action.Therefore, the method that improves the filter Out-of-band rejection 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.The method is that the power level according to the reception signal that detects operates accordingly.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 that passively strong jamming is to the saturation jamming of radio circuit.The 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 for improving 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: the first coupler, be used for 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, so 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; Detection control unit is 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, as interference-cancelled signals, and interference-cancelled signals is coupled to is transferred to adjustment unit; Interference-cancelled signals is carried out time delay, amplitude and phase place adjustment, so 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 the 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 detection control unit is according to the interference signal of described receiver from described interference base station reception, 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, identical and the single spin-echo of the amplitude of radiofrequency signal that makes the interference base station emission that itself and this base station receive by wireless path, thus offset 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 Out-of-band rejection performance, amplifier, frequency mixer to the analog link median filter and analog to digital converter.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 of the present invention above-mentioned and other objects, features and advantages are 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 the disturbed condition of many base stations, the configuration block diagram of interference cancelling system; With

Fig. 9 shows the external disturbance schematic diagram that faces mutually the colocation site base station of work in the frequency band.

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 according to an embodiment of the invention interference cancelling system is 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 the second base station of colocation site or the adjacent cell of interference base station, and receiver 102 is the receivers in this base station (or being called the 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 the 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 the second base station 100, to obtain the radiofrequency signal of interference base station emission, in the 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 the first coupler) extracts the radiofrequency signal of emission in the second base station 100, and this signal is delivered to transmission unit 202.

In the present embodiment, come the elimination of description disturbance signal as example take the interference of colocation site or adjacent cell base station.Be noted that to the invention is not restricted to this, also can be applied to other base station set-up mode, and other need to 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 the second base station 100 of coupler 201 output is sent to adjustment unit 203 through transmission unit 202.The radiofrequency signal of the second base station 100 of 203 pairs of receptions of adjustment unit is carried out time delay, amplitude and phase place adjustment, so that the amplitude of the interference signal that receives from the second base station 100 in the signal of adjustment unit 203 output and the receiver 102 is identical, 180 ° of phase phasic differences, offset from the interference signal of the 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 the second base station 100 from 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 the second base station 100 is sent to offset unit 204.Radio frequency band filter 103 in the receiver 102, low noise amplifier 104 carry out radio frequency bandpass filtering and low noise amplification to the interference signal that receives from the second base station 100 respectively.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 detection control unit 205 with the digital baseband signal after the demodulation.Detection control unit 205 detects for disturbing 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, until reach optimum neutralization effect.Detection control unit 205 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 for counteracting, in order to obtain the neutralization effect of optimum.Because detection control unit 205 forms a closed loop with baseband processing unit 109, so detection control unit 205 can be in real time and controlled rapidly and accurately adjustment unit 203 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 the 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 analog optical fiber transmission circuit as the example of 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 of detection 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 the 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 of detection 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 the 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 of detection control unit 205, make the single spin-echo of the interference radiofrequency signal that the phase place of interference-cancelled signals and the first receiver 102 receive from interference base station by wireless path.

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 the 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 of detection 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 signal of interference 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 mutually 180 ° of the phasic differences of the interference signal that arrives coupler 402 and interference-cancelled signals, thereby the elimination interference signal, and the reception signal that will eliminate interference signal is delivered to frequency converter 105.

Frequency converter 105, if bandpas filter 106, intermediate frequency amplifier 107, analog to digital converter 108, and the function of baseband processing unit 109 is identical with the operating process of describing with reference to figure 1 with operation.For simplicity, omit being repeated in this description them at this.

In example shown in Figure 5, the interference-cancelled signals that adjustment unit 203 outputs to offset unit 204 is radiofrequency signal.Offset unit 204 can be arranged on any position between antenna 101 and the frequency converter 105.As an alternative, the 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 again Interference Cancellation circuit 204.In this case, any position that bucking circuit 204 can be between the first frequency converter 105 and analog to digital converter ADC108, thus realize the counteracting of interference signal in IF-FRE.

Fig. 6 shows the schematic diagram that the 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 the second frequency converter 502.Carry out the reference signal of local oscillation signal of down-conversion as the second frequency converter 502 from interference base station 100, so that the intermediate-freuqncy signal after the frequency conversion reaches Complete Synchronization 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.The second frequency converter 502 becomes to offset 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, so that the amplitude of the interference signal that receives in the amplitude of the interference-cancelled signals of adjustment unit 203 output and the receiver 102 is identical, 180 ° of phase phasic differences, and pass to addition in the offset unit 204, to offset the interference signal from the second base station 100 of colocation site or adjacent cell.Detect control circuit 205 according to the real-time amplitude of wanting repressed interference signal that detects of the baseband signal of baseband processing unit 109 inputs, and time delay, amplitude and phase place that control Circuit tuning 203 changes for interference-cancelled signals reach optimum neutralization effect.

In this example, coupler 201 can be the shunt circuit of a digital baseband signal, and the digital baseband signal that is used for emission 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 also by shunt out, 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 implementation 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.

Adjustment unit 203 can comprise digital to analog converter DAC 501, the second frequency converters 502, delay adjusting unit 503, and amplitude adjustment unit 504 and phasing unit 505, as shown in Figure 7.In adjustment unit 203, after the digital baseband signal that is sent to by transmission unit 202 converts analog baseband signal to through digital to analog converter DAC501, by the second frequency converter 502 analog baseband signal modulation frequency conversion is become radiofrequency signal or the intermediate-freuqncy signal of offsetting usefulness.Become in the situation of radiofrequency signal in the modulated frequency conversion of interference-cancelled signals, bucking circuit 204 can be arranged on any position between antenna 101 and the frequency converter 105, so that interference signal is cancelled at rf frequency.Become in the situation of intermediate-freuqncy signal in the modulation frequency conversion in interference-cancelled signals, bucking circuit 204 can be arranged on any position between frequency converter 105 and the analog to digital converter ADC 108, so that interference signal is cancelled in IF-FRE.Be sent to offset unit 204 after the adjustment of interference-cancelled signals through delay adjusting unit 503, amplitude adjustment unit 504 and phasing unit 505 after the modulation frequency conversion.Be connected in series respectively a delay adjusting device 401,503 in adjustment unit 203 and the offset unit 204.Delay adjusting unit 401 in the bucking circuit 204 matches with delay adjusting unit 503 in the adjustment unit 203, makes mutually 180 ° of the phasic differences of the interference signal that arrives coupler 402 and interference-cancelled signals, thereby eliminates interference signal.In this enforcement, the clock signal that is used for the reference signal of local oscillation signal of the second frequency converter 502 down-conversions and analog to digital converter ADC 108 can be the synchronizing clock signals from the second base station 100, so that the radio frequency after the frequency conversion or intermediate-freuqncy signal and the interference signal that receives reach Complete Synchronization.

The above has described receiver and has been subject 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 in the situation of many base stations interference, the configuration block diagram of interference cancelling system.In the present embodiment, except adding the 3rd base station 701, and be connected to outside the transmission unit 702 and adjustment unit 703 between the 3rd base station 701 and the detection control unit 205, other configuration is with embodiment illustrated in fig. 2 identical.In the present embodiment, receiver 102 is subject to the interference of two interference base stations (for example, 100,600).

In the present embodiment, the 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 the first receiver 102.Use system of the present invention, extract the signal of the second base station 100 by coupler 201, deliver to adjustment unit 203 through transmission unit 202 and process.By the signal that coupler 701 extracts from the 3rd base station 600, deliver to adjustment unit 703 through transmission unit 702 and process.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 the interference signal from colocation site or adjacent cell the second base station 100 and the 3rd base station 600.Wherein detect control circuit 205 and control respectively Circuit tuning 203 and Circuit tuning 703 according to the real-time amplitude that detects repressed interference signal of the baseband signal of baseband processing unit 109 inputs, thereby time delay, amplitude and phase place that independent change is used for two different offseting signals reach the neutralization effect of optimum.

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, so that the amplitude of the interference signal that the signal of adjustment unit 203 output and receiver 102 receive from interference base station by wireless path is 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 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, until reach 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 cost and the design difficulty of base station system itself, the engineering design difficulty that the network planning is disposed when having reduced simultaneously base station colocation site or adjacent cell.The interference signal from colocation site or adjacent cell base station can be effectively suppressed, the performance requirement to key components in the analog link can be reduced again.

So far invention has been described in conjunction with the preferred embodiments.It should be appreciated by those skilled in the art that in 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 to be limited to above-mentioned specific embodiment, and should be limited by claims.

Claims (12)

1. interference cancelling system comprises:
The first coupler be used for 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, so 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;
Detection control unit is 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;
Baseband processing unit is used for the digital baseband signal after the demodulation is offered described detection control unit, and the signal that receives is reverted to primary signal,
Wherein said detection control unit detects interference signal according to resulting digital baseband signal, and controls time delay, amplitude and the phase place that described adjustment unit changes the radiofrequency signal that described transmission unit provides according to detected interference signal.
2. interference cancelling system according to claim 1, wherein said transmission unit is connected between described coupler and the described adjustment unit, and described transmission unit comprises:
Electrical optical converter, the interference-cancelled signals that is used for described the first coupler is provided is modulated into light signal;
Transmitting device is used for transmitting 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 fiber transmission device.
3. interference cancelling system according to claim 2, wherein said transmitting device is the injection high frequency coaxial cable.
4. interference cancelling system according to claim 1, wherein said adjustment unit comprises:
The delay adjusting unit for the time delay that changes interference-cancelled signals under the control of described detection control unit, 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 from the amplitude of the interference radiofrequency signal of described interference base station reception by wireless path with described receiver;
Phasing unit, be used for adjusting under the control of described detection control unit the phase place of described interference-cancelled signals, the phase place that makes described interference-cancelled signals and described receiver are by the single spin-echo of wireless path from the interference radiofrequency signal of described interference base station reception.
5. interference cancelling system according to claim 1, wherein said the first coupler is 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 adjustment unit, makes mutually 180 ° of the phasic differences of the interference signal that arrives the second coupler and interference-cancelled signals;
The second coupler is used for the interference signal that will receive by wireless path and offsets from the interference-cancelled signals of described adjustment unit.
7. interference cancelling system according to claim 6, wherein said offset unit is arranged between the antenna and frequency converter of described reception.
8. interference cancelling system according to claim 1 comprises the second frequency converter in the wherein said adjustment unit, is 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 the 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 the second 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, as interference-cancelled signals, and interference-cancelled signals is coupled to is transferred to adjustment unit;
Interference-cancelled signals is carried out time delay, amplitude and phase place adjustment, so 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 the 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 detection control unit is according to the interference signal of described receiver from described interference base station reception, time delay, amplitude and phase place adjustment that control is carried out interference-cancelled signals;
Digital baseband signal after the demodulation is offered described detection control unit, and the signal that receives is reverted to primary signal,
Described detection control unit detects interference signal according to resulting digital baseband signal, and controls time delay, amplitude and the phase place that adjustment unit changes the radiofrequency signal that transmission unit provides according to detected interference signal.
CN 200710162086 2007-12-04 2007-12-04 Common station address interference elimination system and method CN101453228B (en)

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