CN101404509B - Signal interference canceller and signal interference canceling method - Google Patents

Signal interference canceller and signal interference canceling method Download PDF

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Publication number
CN101404509B
CN101404509B CN200810073897A CN200810073897A CN101404509B CN 101404509 B CN101404509 B CN 101404509B CN 200810073897 A CN200810073897 A CN 200810073897A CN 200810073897 A CN200810073897 A CN 200810073897A CN 101404509 B CN101404509 B CN 101404509B
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signal
module
light
circuit
delay
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CN101404509A (en
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苏磊
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Guilin Aerospace Laser-bit Science & Technology Stock Company
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Guilin Aerospace Laser-Bit Science & Technology Stock Co
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Abstract

The invention discloses a signal interference canceller and a signal interference cancelling method. The signal interference canceller converts an electric interference signal into an optical modulation signal and then transmits the signal to an optical delay line for changing the corresponding optical length passed by the optical signal, so as to realize the delaying of the optical signal and finally converts the optical signal to an electric signal, thereby realizing to transfer the phase of a RF electric signal by (2n+1)180 degrees; wherein, n is equal to 0, 1, 2, 3, and the like; finally the interference signal which affects useful signals is filtered by cancelling. The invention can effectively remove useless signals received by a receiving terminal during the process of multi-carrier transmission; moreover, the invention is characterized by high delaying precision and high electromagnetic interference resistance.

Description

Signal interference cancellation device and signal interference cancellation method
(1) technical field
The present invention relates to a kind of radio signal receiving system, particularly a kind of signal interference cancellation device and signal interference cancellation method.
(2) background technology
In wireless communication field; In order to improve message capacity; Usually can place a plurality of radio station at the three unities; Different wireless carrier of each spontaneous emission of each radio station, and one tunnel carrier signal that often only need receive in a plurality of carrier signals at certain specific signal receiving terminal is a useful signal, the entrained signal of other carrier waves just can be regarded " interference " signal as for the useful signal of required reception like this.Therefore, how effectively with these " interference " filterings, be the key issue that the multicarrier receiving terminal need solve.In the prior art, adopt the interference cancellation device to suppress outer " interference " signal of useful signal bandwidth of receiving terminal usually.So-called interference cancellation purpose is to eliminate " interference " signal; Be that signal transmits through two-way, the one tunnel " interference " signal introducing delay system, and holding frequency and amplitude are constant; And postpone 180 ° of phase shifts; (original signal comprises useful signal and interference signal to another road normal transmission original signal, and this " interference " signal is identical with " interference " signal amplitude, the frequency of delay, 180 ° of phase phasic differences.Signal after the delay disappears with the last generation of the original signal of normal transmission mutually, thereby the different demands of each receiving terminal obtain required separately useful signal.Yet existing interference cancellation device adopts microstrip line as delay line, interference signal is introduced microstrip line postpone 180 ° of phase shifts, realizes offseting of inhibit signal and original signal, finally eliminates interference signal.It is owing to directly postpone transmission to the interference signal of telecommunication that obtains through microstrip line; Therefore exist not enough in the transmission course: loss is big, the delay precision is not high; Anti-electromagnetic interference property is poor, volume is big, Heavy Weight, bandwidth are little; Inherent defects such as adjustability difference make the development of canceller be restricted, when particularly postponing phase shift along with the radiofrequency signal of broadband, great dynamic range; Microstrip line realizes changing flexibly the corresponding increase of difficulty of delay line length, causes the operating efficiency of interference cancellation device obviously to reduce.
(3) summary of the invention
Technical problem to be solved by this invention provides a kind of signal interference cancellation device and signal interference cancellation method; Can effectively eliminate user's unwanted signal that receiving terminal receives in the multi-carrier transmission process; And it is high to have the precision of delay, the characteristics that anti-electromagnetic interference property is strong.
Basic design of the present invention is: be modulated light signal at first, transfer to fibre delay line then disturbing electrical signal conversion, change light signal the corresponding light path of process realize the delay of light signal; Convert light signal into the signal of telecommunication at last, thereby realize rf signal phase shift (2n+1) 180 ° of all after dates, wherein n=0; 1; 2,3 ..., influence the interference signal of useful signal through offseting filtering.
In order to address the above problem, a kind of signal interference cancellation device that the present invention designed comprises main channel, delayed branch and offsets module.Said main channel is used for pending rf signal exported to and offsets module; Export to after said delayed branch is used for rf signal to be postponed handled and offset module; Saidly offset the rf signal of delay that pending rf signal that module is used for the main channel is sent and delayed branch send and offset, obtain required useful signal.Difference of the present invention is: said delayed branch comprises electrooptic conversion module, fibre delay line module and photoelectric conversion module.Said electrooptic conversion module is used for postponing rf signal after signal processing with waiting, is transformed into the light signal of this signal modulation.Said fibre delay line module is used for the frequency according to the interference signal of required elimination, the control light signal the distance of process come delayed optical signal.Said photoelectric conversion module is used for the light signal that postpones phase shift through the fibre delay line module after signal processing, is reduced to former and waits to postpone the consistent rf signal of delay of rf signal amplitude.
In the such scheme, said fibre delay line module comprises a coarse adjustment module and/or fine setting module.Said coarse adjustment module comprises 1 * N optical switch and N * 1 optical switch; Between N input of N output of 1 * N optical switch and N * 1 optical switch, be connected with the optical fiber of different length; The input of 1 * N optical switch links to each other with electrooptic conversion module, and the output of N * 1 optical switch links to each other with photoelectric conversion module; Select the fiber lengths of access delay branch road through optical switch, the control light signal the path of process, realize the coarse adjustment that light signal postpones.Said fine setting module comprises input and the electrooptic conversion module that is connected on 1 * N optical switch; And/or the output of N * 1 optical switch and at least one pair of the delay collimater between the photoelectric conversion module; One of them postpones collimater by Electric Machine Control, can be parallel to two in the drive lower edge of motor and postpone to move on the direction of collimater axial connecting lines; Through the distance between the control lag collimater, the control light signal the path of process, realize the fine setting that light signal postpones.
The signal interference cancellation method that above-mentioned signal interference cancellation device is adopted comprises:
Step 1, pending rf signal exported to offset module;
Step 2, export to after will rf signal postponed handling and offset module;
The rf signal of delay that step 3, the pending rf signal that step 1 is sent and step 2 send offsets and obtains useful signal;
Its difference is: said step 2 comprises
Step 2-1, will wait to postpone rf signal after signal processing, be transformed into the light signal of this signal modulation;
Step 2-2, according to the frequency of the interference signal of required elimination, the control light signal the distance of process come delayed optical signal;
Step 2-3, will pass through the light signal that accurate automatic and adjustable fibre delay line module postpones 180 ° of all after dates of phase shift (2n+1), n=0 wherein, 1,2,3 ..., be reduced to former and wait to postpone the consistent rf signal of delay of rf signal amplitude.
In the such scheme, said step 1 comprises:
Step 1-1, realization impedance transformation make the impedance matching of waiting to postpone rf signal and band pass filter of input;
Step 1-2, select needed useful signal;
Step 1-3, filtered useful signal is amplified in advance the attenuation losses that causes with the compensating band bandpass filter;
Step 1-4, the signal of telecommunication after will amplifying are sent to drive laser work;
Step 1-5, signal of telecommunication modulation is become light signal send.
In order further to export stable luminous power, before the signal of telecommunication after the amplification of said step 1-4 goes drive laser work, also comprise light-operated step and/or temperature control step.So-called light-operated step promptly utilizes the signal of laser inner detector output to carry out the rectification amplification, makes it to become the control voltage with the luminous power size variation, thereby the biasing circuit of control laser reaches the purpose of controlling Output optical power.So-called temperature control step is promptly utilized the inner thermistor of laser; Add precision resistance and be connected into bridge circuit; Become variation of temperature the variation of voltage; Amplify through direct current again and go control flows to cross the size of current of the refrigerator of laser organ pipe in-core, reach thermostatic effect, thereby the variation that guarantees the luminous power of laser remains within certain scope.
In the such scheme, said step 3 comprises:
Step 3-1, convert the light signal that receives into the signal of telecommunication;
Step 3-2, the above-mentioned signal of telecommunication of changing out is carried out preposition amplification;
Step 3-3, the signal of telecommunication after the preposition amplification is carried out high-pass filtering, filters low noise and interference;
Step 3-4, select useful signal;
Step 3-5, useful signal is amplified in advance, the gain of the signal of telecommunication is modulated and the frequency of the signal of telecommunication is carried out corresponding compensation;
Step 3-6, preparatory amplifying signal is amplified to once more the amplitude that needs.
For the amplitude that postpones rf signal that guarantees to export with postpone before the amplitude that postpones rf signal of waiting be consistent; The signal of said above-mentioned steps 3 also comprises the amplitude regulating step before output, promptly carry out continuously adjustable to the radiofrequency signal amplitude of exporting in the photoelectric conversion module.
Below we describe the principle of fibre delay line:
Rf signal input laser diode, the light signal that laser diode becomes this signal to modulate the input radio frequency converting electrical signal is through light joint coupled into optical fibres.Photoelectric detector is transformed to original rf signal again with the light signal of rf modulations.The frequency spectrum of the rf signal of output is fully identical with the frequency spectrum of the input radio frequency signal of telecommunication; Just postponed a period of time as medium with optical fiber; That is to say; Radiofrequency signal is instantaneous to be stored in the fibre delay line unit, and the length of the time of storage is directly proportional with length of fiber, the principle of Here it is fibre delay line.
When light wave was propagated with speed v in optical fiber, the length of delay was proportional to length of fiber L, and the time delay that produces of the optical fiber of length-specific L can be expressed as so:
Δt=L/v=Ln/c
In the following formula, n is that wavelength is the refractive index of light wave in optical fiber of λ, and c is the propagation velocity of light wave in free space.By the expression formula of Δ t, we can find out that the length of time of delay is directly proportional with fiber lengths L, as long as can change length of fiber, perhaps select the optical fiber of different length through optical switch, just can realize different delay time.
The present invention compared with prior art has following advantage:
1, the fibre delay line module can accurately be regulated light path, and according to the frequency of signal, and the time of required delay is controlled the length that optical fiber postpones; Thereby realize the delay of light signal, and then realize 180 ° of the accurate phase shifts (2n+1) of the signal of telecommunication, wherein n=0; 1,2,3
2, can realize the tracking of amplitude through increasing the amplitude regulating circuit, realize that output amplitude is adjustable continuously, keep consistent, to eliminate owing to the certain influence of optical transceiver itself to the output amplitude generation of signal with the original signal amplitude;
Advantages such as 3, signal transmits with optical fiber, and it is little to have a loss, and it is high to postpone precision, and anti-electromagnetic interference property is strong can increase substantially the performance index and the reliability of system.
(4) description of drawings
Fig. 1 is the schematic diagram of a kind of preferred signals interference cancellation of the present invention device;
Fig. 2 is the schematic diagram of a kind of preferred electrooptic conversion module of the present invention;
Fig. 3 is the schematic diagram of a kind of preferred fiber delay line module of the present invention;
Fig. 4 is the schematic diagram of a kind of preferred photoelectric conversion module of the present invention;
Fig. 5 is a kind of preferred amplitude regulating circuit of the present invention schematic diagram.
(5) embodiment
Fig. 1 comprises main channel, delayed branch and offsets module for the schematic diagram of a kind of preferred signals interference cancellation of the present invention device.The rf signal of two-way at least that comes from the emission of different radio station receives through antenna, and these rf signals are the receiving terminal of entering signal interference cancellation device simultaneously.The receiving terminal of canceller include one initiatively induction influence receiver module; This module can be picked out user's unwanted signal; Different active induction influences the signal of telecommunication that receiver module can be responded to different frequency, and with it as waiting that postponing rf signal imports different delayed branch respectively into.The signal that is not induced then imports in the main channel as pending rf signal, and directly sends in the canceller through cable.
Delayed branch of the present invention when the signal that promptly receives when receiving terminal is one road useful signal and a tunnel " interference " signal, then is provided with one road delayed branch according to the frequency configuration of " interference " signal of required elimination; And the signal that receives when receiving terminal then is provided with the two-way delayed branch when being " interference " signal of one road useful signal and two-way different frequency, and the rest may be inferred ..., be used for converting rf signal to be postponed into light signal; According to the frequency of the signal of required elimination, the control light signal the light path of process come delayed optical signal; Light signal through after postponing 180 ° of phase shifts, is reduced to former and waits to postpone the consistent rf signal of delay of rf signal amplitude, export at last and offset module.Delayed branch of the present invention mainly is made up of Tiny Electro-Optic modular converter, fibre delay line module and photoelectric conversion module.
Electrooptic conversion module is used for postponing rf signal after signal processing with waiting, is transformed into the light signal of this signal modulation, and it comprises input matching circuit, band pass filter, preparatory amplifying circuit, drive circuit for laser, laser and power supply.The electrooptic conversion module of present embodiment is as shown in Figure 2, mainly is made up of drive circuit, indicating circuit, laser and the power supply of input matching circuit, band pass filter, preparatory amplifying circuit, laser.Pending rf signal is realized impedance transformation through match circuit, makes the impedance matching of input impedance and filter, reduces reflection; Select needed useful signal rf signal promptly to be postponed through band pass filter then; Then amplify in advance through preparatory amplifying circuit again, signal is amplified about 10dB, the attenuation losses that causes with the compensating band bandpass filter; Signal after the amplification is divided into two-way through distributor, and one the tunnel sends to the drive circuit of drive laser, and the indicating circuit display working condition is given on another road.In order to guarantee the stable luminous power of laser output, present embodiment can also add accurate light-operated and temperature control circuit in electrooptic conversion module.Light-operated circuit is exactly to utilize the signal that is made in the output of laser inner detector to carry out rectification to amplify, and make it to become the control voltage with the luminous power size variation, thereby the biasing circuit of control laser reaches the purpose of controlling Output optical power.Temperature control circuit then is the thermistor that utilizes laser inner; Add precision resistance and be connected into bridge circuit; Become variation of temperature the variation of voltage; Amplify through direct current again and go control flows to cross the size of current of the refrigerator of laser organ pipe in-core, reach thermostatic effect, thereby the variation that guarantees the luminous power of laser remains within certain scope.
The fibre delay line module links to each other with controller through data wire, according to the frequency of the interference signal of the required elimination of input in controller, thereby the control light signal the distance of process, 180 ° of the delay phase shifts of realization light signal.Light signal after the modulation gets in the fibre delay line module and postpones; Because the light signal of different frequency postpones 180 ° of required optical fiber of phase shift and postpones the length difference; The manual adjustments length of fiber can not guarantee 180 ° of accurate phase shifts, so present embodiment adopts accurate automatic and adjustable fibre delay line module to carry out 180 ° of the accurate delay phase shifts of light signal.As shown in Figure 3, accurate automatic and adjustable fibre delay line module mainly is made up of optical switch, optical fiber, collimater, motor, encoder and controller.Controller is used to coordinate to control the work of whole optical fiber delay line module.Said optical switch effect is that the whole length of the optical fiber that inserts is selected; Realize the coarse adjustment that light signal postpones; Comprise 1 * N optical switch and N * 1 optical switch; Between N input of N output of 1 * N optical switch and N * 1 optical switch, be connected with the optical fiber of different length, 1 * N optical switch links to each other with photoelectric conversion module with electrooptic conversion module respectively with N * 1 optical switch.The gear that the delay of above-mentioned N value and this signal interference cancellation device is regulated is relevant, through the switching of optical switch, selects the fiber lengths of access delay branch road, regulate light signal the light path of process, realize the coarse adjustment of light signal delay.For light path is further accurately regulated; Present embodiment comprises that also at least one pair of is connected on the input of 1 * N optical switch and the delay collimater between the electrooptic conversion module; And/or pair of series is in the output of N * 1 optical switch and the delay collimater between the photoelectric conversion module, and its effect is to regulate light beam, the light path of control beam between two collimaters; Realize the fine setting that light signal postpones, and make it can accurately get into optical fiber.Every collimation device average level is fixed on the anchor clamps, and one of them postpones collimater by Electric Machine Control, can be parallel to two in the drive lower edge of motor and postpone to move on the direction of collimater axial connecting lines; Through the distance between the control lag collimater, the control light signal the path of process, realize the fine setting that light signal postpones.Motor then drives collimater and moves, and guarantees the accurate delay of light signal, thereby reaches the fine setting purpose of delay.Encoder comes down to use as counting, and the angular transition that it turns over motor is that corresponding information feedback is given controller.Controller carries out control corresponding through data processing and to motor, makes motor to move.Accurate automatic and adjustable fibre delay line module routine is following: when certain signal frequency of input in controller, controller control optical switch selects to insert the whole length of corresponding optical fiber, the coarse adjustment that postpones; Thereby the while motor is driven the drive slide block and is moved, and moves the distance (distance of adjusting is according to the frequency shift of signal) of regulating between the collimater through slide block, the fine setting that postpones, thus guarantee that different fibers postpones length and can be consistent with correspondent frequency.When motor forwards the angle of regulation to, the distance between the collimater reaches the delay necessary requirement, and encoder feedback information is given controller, and controller stops drive motors; Otherwise controller will continue drive motors and rotate, and encoder is monitored and in time to the controller feedback information in real time.
After photoelectric conversion module is used for the light signal that postpones phase shift through the fibre delay line module handled, is reduced to former and waits to postpone the consistent rf signal of delay of rf signal amplitude.The micro photo electric modular converter of present embodiment is as shown in Figure 4, mainly is made up of pre-amplification circuit, high pass filter, band pass filter, preparatory amplifying circuit, coupling output amplifier, distributor, indicating circuit, detector and power supply.Light signal is converted into the signal of telecommunication through detector; The signal of telecommunication at first carries out small-signal through pre-amplification circuit and amplifies; The signal of pre-amplification circuit output is selected useful signal through band pass filter again through high pass filter filters low noise and interference, amplifies in advance through preparatory amplifying circuit then; Through output amplifier, signal is amplified to the amplitude that needs at last.The signal of telecommunication of output amplifier output is through distributor, and one the tunnel exports to as signal and to offset module, and test port and indicating circuit are given in another road.Because the delayed electric signal amplitude of output receives the influence of optical transceiver module gain; For the amplitude of the pending radiofrequency signal transmitted in the amplitude that makes delayed radio frequence and the main channel is consistent; Present embodiment is introduced the amplitude adjustment module to the signal of telecommunication of photoelectric conversion module output, like Fig. 5.Amplitude regulating circuit operation principle is following: the signal of input is through behind the amplifier; Output voltage of signals amplitude is different along with the difference of frequency input signal; Through comparing the amplitude of inhibit signal and original signal; Utilize external knob to regulate the resistance of R16 slide-changing resistor, thereby the amplitude of control output signal guarantee that the amplitude of the pending signal of transmission in inhibit signal and the main channel is consistent.
180 ° of the phasic differences mutually of the last pending rf signal that has postponed rf signal and normal transmission, but amplitude is identical, and both pass through and offset module is after superposeing in the mixer, the interference signal of the useful signal of finally eliminating the effects of the act.For the multi-carrier communication circuit that needs are eliminated multichannel " interference " signal; Can adopt the mode of parallel connection; Promptly adopt a plurality of active inductions to influence receiver module and from the rf signal that receives, select " interference " signal of frequency match with it respectively; Send into respectively and postpone 180 ° of phase shifts in the different delayed branch, send in the lump to offset in the module then and once eliminate.
The present invention can be 0.5 cycle with treating that delayed optical signal postpones 180 ° of phase shifts not only, also can be with treating delayed optical signal delay 1.5 cycles of phase shift, 2.5 cycles, 3.5 cycles ..., be about to treat that delayed optical signal postpones 180 ° of cycles of phase shift (2n+1); N=0 wherein, 1,2; 3 ... Send in the canceller again and offset, but as long as the delay that realizes the signal of telecommunication indirectly through light signal in the signal interference cancellation device offsets, promptly within protection scope of the present invention.

Claims (10)

1. signal interference cancellation device comprises:
Main channel: be used for pending rf signal exported to and offset module;
Delayed branch: be used for offseting module with waiting to export to after postponing rf signal handles;
Offset module: the rf signal of delay that pending rf signal that is used for the main channel is sent and delayed branch send offsets, and obtains required useful signal;
It is characterized in that: said delayed branch comprises
Electrooptic conversion module: be used for postponing rf signal after signal processing, be transformed into the light signal of this signal modulation with waiting;
The fibre delay line module: be used for frequency according to the interference signal of required elimination, the control light signal the light path of process come delayed optical signal;
Photoelectric conversion module: be used for process fibre delay line module is postponed phase shift (2n+1) 180 ° n=0 wherein, 1,2,3 ..., the light signal in cycle is reduced to former and waits to postpone the consistent rf signal of delay of rf signal amplitude after signal processing.
2. signal interference cancellation device according to claim 1; It is characterized in that: said fibre delay line module comprises a coarse adjustment module; This coarse adjustment module comprises 1 * N optical switch and N * 1 optical switch; Between N input of N output of 1 * N optical switch and N * 1 optical switch, be connected with the optical fiber of different length, the input of 1 * N optical switch links to each other with electrooptic conversion module, and the output of N * 1 optical switch links to each other with photoelectric conversion module; Select the fiber lengths of access delay branch road through optical switch, the control light signal the path of process, realize the coarse adjustment that light signal postpones.
3. signal interference cancellation device according to claim 2; It is characterized in that: said fibre delay line module also comprises a fine setting module; This fine setting module be pair of series in the input of 1 * N optical switch and the delay collimater between the electrooptic conversion module, and/or pair of series is in the output of N * 1 optical switch and the delay collimater between the photoelectric conversion module; Every pair postpone collimater one of them postpone collimater by Electric Machine Control, can be parallel to two in the drive lower edge of motor and postpone to move on the direction of collimater axial connecting lines; Through the distance between the control lag collimater, the control light signal the path of process, realize the fine setting that light signal postpones.
4. signal interference cancellation device according to claim 1 is characterized in that: said electrooptic conversion module comprises input matching circuit, band pass filter, preparatory amplifying circuit, drive circuit, laser and power supply;
Match circuit: be used to realize impedance transformation, make the impedance matching of waiting to postpone rf signal and band pass filter of input;
Band pass filter: be used to select needed useful signal;
Preparatory amplifying circuit: be used for filtered useful signal is amplified in advance the attenuation losses that causes with the compensating band bandpass filter;
Drive circuit: be used for the signal of telecommunication after amplifying is sent to drive laser work;
Laser: be used for that signal of telecommunication modulation is become light signal and send.
5. signal interference cancellation device according to claim 4, it is characterized in that: said electrooptic conversion module also comprises light-operated circuit and/or temperature control circuit; Light-operated circuit utilizes the signal of laser inner detector output to carry out the rectification amplification, makes it to become the control voltage with the luminous power size variation, thereby the biasing circuit of control laser reaches the purpose of controlling Output optical power; Temperature control circuit utilizes the inner thermistor of laser; Add precision resistance and be connected into bridge circuit; Become variation of temperature the variation of voltage; Amplify through direct current again and go control flows to cross the size of current of the refrigerator of laser organ pipe in-core, reach thermostatic effect, thereby the variation that guarantees the luminous power of laser remains within certain scope.
6. signal interference cancellation device according to claim 1 is characterized in that: said photoelectric conversion module comprises pre-amplification circuit, high pass filter, band pass filter, preparatory amplifying circuit, detector and power supply;
Detector: be used for converting the light signal that receives into the signal of telecommunication;
Pre-amplification circuit: be used for the signal of telecommunication that detector is changed out is amplified;
High pass filter: be used for the low-frequency noise and the interference of the above-mentioned signal of telecommunication after preposition amplification of filtering, and it is sent into band pass filter;
Band pass filter: be used to select useful signal;
Preparatory amplifying circuit: be used for the gain of useful signal is modulated, and the frequency of useful signal is carried out corresponding compensation.
7. signal interference cancellation device according to claim 6; It is characterized in that: said interference cancellation device also comprises the amplitude adjustment module; This amplitude adjustment module is carried out continuously adjustable to the radiofrequency signal amplitude of exporting in the photoelectric conversion module, the amplitude of treating delayed radio frequence before guaranteeing the amplitude that postpones rf signal of output and not postponing is consistent.
8. signal interference cancellation method comprises
Step 1, pending rf signal exported to offset module;
Step 2, will wait to postpone to export to after rf signal is handled and offset module;
The rf signal of delay that step 3, the pending rf signal that step 1 is sent and step 2 send offsets, and obtains required useful signal;
It is characterized in that: said step 2 comprises
Step 2-1, will wait to postpone rf signal after signal processing, be transformed into the light signal of this signal modulation;
Step 2-2, according to the frequency of the interference signal of required elimination, the control light signal the light path of process come delayed optical signal;
Step 2-3, will through and delay phase shift (2n+1) 180 °, n=0 wherein, 1,2,3 ..., the light signal in cycle is reduced to former and waits to postpone the consistent rf signal of delay of rf signal amplitude.
9. signal interference cancellation method according to claim 8; It is characterized in that: said step 2-2 comprises a coarse steps; This coarse steps is selected the fiber lengths of access delay branch road through optical switch, the control light signal the path of process, realize the coarse adjustment that light signal postpones.
10. signal interference cancellation method according to claim 9; It is characterized in that: said step 2-2 comprises a trim step; This trim step is through the distance between the control lag collimater, the control light signal the path of process, realize the fine setting that light signal postpones.
CN200810073897A 2008-11-11 2008-11-11 Signal interference canceller and signal interference canceling method Expired - Fee Related CN101404509B (en)

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