CN101119121A - Anti-interference method in receiver, anti-interference receiver and anti-interference device - Google Patents
Anti-interference method in receiver, anti-interference receiver and anti-interference device Download PDFInfo
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- CN101119121A CN101119121A CNA2007101357976A CN200710135797A CN101119121A CN 101119121 A CN101119121 A CN 101119121A CN A2007101357976 A CNA2007101357976 A CN A2007101357976A CN 200710135797 A CN200710135797 A CN 200710135797A CN 101119121 A CN101119121 A CN 101119121A
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Abstract
The present invention discloses an antijamming receiver, comprising an antijamming compensation module, which is used for distinctively disposing the antijamming signal inside the useful signal bandwidth amid all the signals and transmitting the disposed signal. The present invention also discloses an antijamming device and an antijamming method for receiver. The antijamming proposal of the receiver restrains the interference signal inside the useful signal bandwidth in unprocessed signal and increases systematic performance.
Description
Technical field
The present invention relates to the receiver technology, relate in particular to anti-disturbance method in the receiver, anti-interference receiver and jamproof device.
Background technology
In the mobile communication base station, need receive wireless signal by receiver.In order to improve message capacity, the normal multi-carrier receiver that uses in the mobile communication base station, be to comprise a plurality of wireless carriers in the single radio frequency passage, more specifically, exactly some link of radio-frequency channel such as a coaxial cable in or comprise a plurality of carrier waves in the signal of a pair of differential lines.Referring to Fig. 1, be the carrier wave configuration schematic diagram of multi-carrier receiver in the prior art, be the center with fc among the figure, 5 carrier waves in bandwidth is the scope of B all are useful signals.
The multicarrier configuration of multi-carrier receiver is different according to the concrete condition of mobile communication system.Such as, for the multi-carrier receiver in Wideband Code Division Multiple Access (WCDMA) (WCDMA, the Wideband Code Division Multiple Access) system, at fc=190MHz, the carrier wave that 4 bandwidth of possible configuration are 5MHz in the B=20MHz scope, wherein, B can be described as the useful signal bandwidth of receiver; For another example, for the multi-carrier receiver in global system for mobile telecommunications (GSM, the Global System of Mobil Communications) system, at fc=83MHz, the carrier wave that may sparsely to dispose 4～8 bandwidth in the B=10MHz scope be 200kHz.The centre frequency of these carrier waves may change with the network configuration of mobile communication system, and possible some carrier wave does not dispose.On the described carrier position that does not dispose, and in the useful signal bandwidth all interference signal may appear on other position except that each carrier wave, certainly, and outside the useful signal bandwidth, also interference signal may occur, and the amplitude of described interference signal may be greater than the amplitude of useful signal.Referring to Fig. 2, be the interference schematic diagram in the multi-carrier receiver in the prior art.Interference shown in the figure may be the interference from the base station signal of neighbor cell, also may be the interference of the wireless signal of other non-hope., be the key issue that multi-carrier receiver need solve how effectively with these interference filterings.
In the prior art, adopt band pass filter to come the outer interference signal of useful signal bandwidth of suppression receiver usually.Referring to Fig. 3, be the structural representation of receiver in the prior art.After carrying atmospheric radio waves process antenna 301 receptions of information, be converted to the signal of telecommunication in the coaxial cable, be sent to simulation receive path 302.Simulation receive path logical 302 can carry out the frequency conversion filter amplifying processing to the signal of telecommunication, often comprises low noise amplifier, one or more levels frequency mixer, filter and variable gain amplifier, or the like.The signal that receives through antenna 301 is a radiofrequency signal, and the signal behind the frequency mixer in the process simulation receive path 302 is the intermediate-freuqncy signal after frequency reduces.Still have interference through the signal behind the simulation receive path 302, for shown in Figure 2.
Below band pass filter 303 is described.Referring to Fig. 4, be the characteristic schematic diagram of band pass filter in the prior art, it is fc that band pass filter shows as a centre frequency, passband width is the filter of B, in the present embodiment, supposing that the bandwidth of useful signal of receiver is identical with the pass band width of band pass filter 303, all is B.Decay in the band pass filter band is very little, and such as being 0～2dB, band is outer very big with respect to the decay A in the band, such as being 50～70dB.The relation of the signal behind the process simulation receive path 302 and the filtering characteristic of band pass filter as shown in Figure 5.Band pass filter is inhibited referring to Fig. 6 to the outer interference signal of useful signal bandwidth, Fig. 6 is through the signal schematic representation behind the band pass filter 303 among Fig. 3, as can be seen, the interference signal that the band pass filter pass band width is outer, being frequency has obtained bigger inhibition less than the interference signal of fc-B/2 and frequency greater than the interference signal of fc+B/2.
Analog to digital converter (ADC, analogue to digital converter) 304 will be to export after the digital signal by the conversion of signals of band pass filter 303 inputs.
In realizing process of the present invention, the inventor finds that there is following problem in prior art: the available technology adopting band pass filter comes the method for suppression receiver interference signal, though suppressed the outer interference of useful signal bandwidth, but do not played inhibitory action for the interference in the useful signal bandwidth.
Interference in the useful signal bandwidth will bring problems, for example carry out having following problem when analog-to-digital through the signal behind the band pass filter to above-mentioned:
The signal that input analog-to-digital converter carries out in the analog-to-digital useful signal bandwidth comprises interference signal and carrier signal, somely disturb the peak that signal, carrier signal surpass the analog to digital converter dynamic range, to cause the analog to digital converter overload, if carrier signal is less than the minimum point of analog to digital converter dynamic range, analog to digital converter will be difficult to detect this carrier signal.Therefore, otherwise make the analog to digital converter overload, then the interference signal of input analog-to-digital converter, useful signal can not be higher than the peak of analog to digital converter dynamic range, simultaneously, otherwise make the carrier signal of input analog-to-digital converter too small, then need to amplify carrier signal, thereby make the carrier signal of input analog-to-digital converter be higher than the minimum point of analog to digital converter dynamic range by the gain that increases the simulation receive path.But, also amplified interference signal when amplifying carrier signal, the interference signal after the amplification may exceed the analog to digital converter dynamic range greater than the peak of analog to digital converter, makes the analog to digital converter overload, cause receiver performance to be affected, serious will cause the receiver communication disruption.
Summary of the invention
The embodiment of the invention provides a kind of anti-interference receiver, this receiver can suppression receiver in interference signal in the useful signal bandwidth.
The embodiment of the invention provides a kind of jamproof device, this device can suppression receiver in interference signal in the useful signal bandwidth.
The embodiment of the invention provides anti-disturbance method in a kind of receiver, this method can suppression receiver in interference signal in the useful signal bandwidth.
A kind of anti-interference receiver, this receiver comprises the interference cancellation module, and the interference signal that is used for treating in the useful signal bandwidth of processing signals offsets processing, and output offsets the signal after the processing.
A kind of jamproof device, this device comprise that main channel, feedforward branch road and simulation offset module;
Described main channel is used to receive pending signal, exports to described simulation and offsets module;
Described feedforward branch road, the carrier signal that is used for treating processing signals carry out trap to be handled, and sends the signal after handling to described simulation and offsets module;
Described simulation offsets module, and described main channel signal that transmits and the signal that described feedforward branch road transmits are offseted, and the signal that offsets after the processing is exported.
Anti-disturbance method in a kind of receiver, this method comprises:
Interference signal in the useful signal bandwidth in the pending signal of input receiver is offseted processing, obtain offseting the signal after the processing.
From such scheme as can be seen, the embodiment of the invention is by offseting processing with the interference signal in the useful signal bandwidth in the signal of receiver, obtains offseting the signal after the processing, like this, suppressed the interference signal in the useful signal bandwidth in the receiver, systematic function is provided.
Description of drawings
Fig. 1 is the carrier wave configuration schematic diagram of multi-carrier receiver in the prior art;
Fig. 2 is the interference schematic diagram in the multi-carrier receiver in the prior art;
Fig. 3 is the structural representation of receiver in the prior art;
Fig. 4 is the characteristic schematic diagram of band pass filter in the prior art;
Fig. 5 be among Fig. 3 through simulation behind the receive path 302 signal and the filtering characteristic of band pass filter concern schematic diagram;
Fig. 6 is through the signal schematic representation behind the band pass filter 303 among Fig. 3;
Fig. 7 a is the structural representation of embodiment of the invention anti-interference receiver;
Fig. 7 b is the structural representation of interference cancellation module among Fig. 7 a;
Fig. 8 is the structural representation of first execution mode of interference cancellation module 704 among Fig. 7;
Fig. 9 is the structural representation that 802 cascades of simulation useful signal trap module realize among Fig. 8;
The trap characteristic schematic diagram of trap module 1 when Figure 10-1 is 5 for trap module among Fig. 9;
The trap characteristic schematic diagram of trap module 2 when Figure 10-2 is 5 for trap module among Fig. 9;
The trap characteristic schematic diagram of trap module 3 when Figure 10-3 is 5 for trap module among Fig. 9;
The trap characteristic schematic diagram of trap module 4 when Figure 10-4 is 5 for trap module among Fig. 9;
The trap characteristic schematic diagram of trap module 5 when Figure 10-5 is 5 for trap module among Fig. 9;
Figure 11 is the configuration schematic diagram of the trap module of 5 frequencies among Figure 10;
Figure 12 is the response schematic diagram of 5 stage notch shown in Figure 11;
Figure 13 is the schematic diagram through the signal after the simulation useful signal trap module shown in Figure 11;
Figure 14 is for offseting the signal schematic representation after the module 73 through simulation among Fig. 7 b;
Figure 15 is the structural representation of second execution mode of interference cancellation module 704 among Fig. 7;
Figure 16 is the structural representation of the 3rd execution mode of interference cancellation module 704 among Fig. 7;
Figure 17 is the exemplary process diagram of anti-disturbance method in the embodiment of the invention receiver;
Figure 18 is the flow chart of anti-disturbance method example one in the embodiment of the invention receiver;
Figure 19 is the flow chart of anti-disturbance method example two in the embodiment of the invention receiver;
Figure 20 is the flow chart of anti-disturbance method example three in the embodiment of the invention receiver.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
The embodiment of the invention offsets processing to the interference signal in the useful signal bandwidth in the pending signal in the receiver, obtains offseting the signal after the processing.Described pending signal can be interior antenna of receiver and the signal between the analog to digital converter.Here the module that offsets processing in the receiver is called the interference cancellation module, the position of interference cancellation module is flexible, can realize on radio frequency, also can realize on intermediate frequency.Be example with structure shown in Figure 7 below, the anti-tampering scheme of the embodiment of the invention is specifically described.Among Fig. 7, the interference cancellation module places between band pass filter 703 and the ADC705, and this moment, described pending signal was by the signal in the band pass filter 703 input interference cancellation modules 704.Certainly, also may comprise other device between band pass filter 703 and the ADC705, as: frequency mixer, low noise amplifier, variable gain amplifier etc.
Referring to Fig. 7 a, be the structural representation of embodiment of the invention anti-interference receiver, this receiver comprises antenna 701, simulation receive path 702, band pass filter 703, interference cancellation module 704 and ADC705.In the receiver of the embodiment of the invention, band pass filter 703 can also place between interference cancellation module 704 and the ADC705, in this case, signal by 702 outputs of simulation receive path suppresses by the interference signal in 704 pairs of useful signal bandwidth of interference cancellation module earlier, by band pass filter the outer interference signal of useful signal bandwidth is suppressed again.If baseband sampling after the demodulation of receiver employing analog I, ADC705 is double channel A C, if receiver adopts if sampling, ADC705 is single channel ADC.
Here, place before the simulation receive path 702 with band pass filter 703, and receiver adopts if sampling, just ADC705 is an example for single channel ADC, and the receiver of the embodiment of the invention is described.Different with receiver in the prior art is that the embodiment of the invention has increased interference cancellation module 704.Referring to Fig. 7 b, be the structural representation of interference cancellation module 704 among Fig. 7 a, the interior interference signal of useful signal bandwidth that interference cancellation module 704 is used for to the received signal offsets processing.Interference cancellation module 704 comprises that main channel 71, feedforward branch road 72 and simulation offset module 73.
In specific implementation, interference cancellation module 704 has simulation feed forward approach and two kinds of implementations of digital feed forward method, is described respectively below in conjunction with Fig. 8, Figure 19 and Figure 20.
Referring to Fig. 8, be the structural representation of first execution mode of interference cancellation module 704 among Fig. 7.At this moment, interference cancellation module 704 realizes that by the simulation feed forward approach main channel 71 is made up of simulation compensation of delay module 801, feedforward branch road 72 by simulation useful signal trap module 802 with simulate the width of cloth mutually compensating module 803 form.
Simulation compensation of delay module 801 is used for the signal of input main channel is carried out the compensation of delay processing.
Produced time delay in the process to signal processing owing to feedover on the branch road, handled so will carry out compensation of delay to signal on the main channel, arrival is simulated, and the main channel signal that offsets module 705 and the tributary signal that feedovers are synchronous.
Simulation useful signal trap module 802 is used for that the carrier signal of input signal is carried out trap and handles, and extracts interference signal.Simulation useful signal trap module 802 can realize that the trap frequency of trap module is the signal frequency of carrier wave in the feedforward tributary signal with one or more trap module.When simulation useful signal trap module 802 need be carried out trap to the carrier signal of a plurality of frequencies, simulation useful signal trap module 802 was by a plurality of trap module cascades realizations, and each trap module is carried out trap to a carrier wave.Referring to Fig. 9, be the structural representation of simulation useful signal trap module 802 cascades realization among Fig. 8.Each trap module is controlled by corresponding switch among Fig. 9.
If the operating frequency of carrier wave is completely fixed in the feedforward tributary signal, perhaps basic fixed, then each trap module can be the trap module of fixed frequency; If the operating frequency of each carrier wave is not fixed in the feedforward tributary signal, but variable in a frequency range, then each trap module can be the trap module of variable frequency.If the frequency bandwidth of each trap module is constant substantially, the centre frequency of trap modules at different levels can change within the specific limits, as be exactly this situation when being used for the multi-carrier receiver of gsm system, at this moment,, except control, can also adjust the control of useful signal trap module the centre frequency of trap modules at different levels to switches at different levels.
For example simulation useful signal trap module 802 is described below: in the receiver of WCDMA system, the control of being controlled to be of simulation useful signal trap module 802 to the switch of each trap module; In the gsm system receiver, whether each trap module works changes along with the configuration of the working frequency points of each carrier wave, and,, also to control the working frequency points of each trap module so not only will control to the switch of each trap module because the working frequency points of each carrier wave changes greatly; When WCDMA and GSM carrier wave are used with, it is the situation that needs to handle simultaneously WCDMA carrier wave and GSM carrier wave in the receiver, trap module among Fig. 9 comprises the trap module of WCDMA bandwidth and the trap module of GSM bandwidth at this moment, and this just need make control corresponding to each trap module according to the configuring condition of network frequency.Be the operation principle that example illustrates simulation useful signal trap module 802 with 5 work carrier waves below, at this moment, the trap module among Fig. 9 is 5, comprises trap module 1,2,3,4 and 5.Suppose that 5 work carrier waves are respectively carrier wave 1,2,3,4 and 5, operating frequency increases successively from carrier wave 1～carrier wave 5.1 pair of carrier wave of trap module 1 carries out trap, and Figure 10-1 is the trap characteristic schematic diagram of trap module 1; 2 pairs of carrier waves of trap module 2 carry out trap, and Figure 10-2 is the trap characteristic schematic diagram of trap module 2; 3 pairs of carrier waves of trap module 3 carry out trap, and Figure 10-3 is the trap characteristic schematic diagram of trap module 3; 4 pairs of carrier waves of trap module 4 carry out trap, and Figure 10-4 is the trap characteristic schematic diagram of trap module 4; 5 pairs of carrier waves of trap module 5 carry out trap, and Figure 10-5 is the trap characteristic schematic diagram of trap module 5.Figure 10-1 is to Figure 10-5, and B is the useful signal bandwidth of receiver, and fc is the centre frequency of useful signal bandwidth range.Certainly in the practice, how the frequency of each trap module of simulation useful signal trap module 802 distributes according to specific design, and not necessarily the order of putting by the trap module increases successively.
Suppose that carrier wave 2 and carrier wave 4 do not work, then the switch of trap module 2 and trap module 4 should close, and promptly this two stage notch is by bypass (bypass), referring to Figure 11, is the configuration schematic diagram of the trap module of 5 frequencies among Figure 10.Correspondingly, the response of 5 stage notch of Figure 11 as shown in figure 12.
Referring to Figure 13, be schematic diagram through the signal after the simulation useful signal trap module shown in Figure 11.As shown in Figure 13, through being mainly the interference signal in the useful signal bandwidth in the useful signal bandwidth after the simulation useful signal trap module.Each carrier signal also has some remnants among Figure 13, and this is because the imperfection of actual simulation useful signal trap module causes.
As shown in Figure 8, simulation useful signal trap module 802 can comprise simulation useful signal trap submodule 81 and simulation trap characteristic control submodule 82.
Simulation useful signal trap submodule 81 is used for the carrier signal in the input signal being carried out trap handling under the control of simulation trap characteristic control submodule 82.
Simulation trap characteristic control submodule 82 is used for control simulation useful signal trap submodule 81 and carries out the trap processing.The control of 82 pairs of simulations of simulation trap characteristic control submodule useful signal trap submodule 81 comprises: under the running parameter configuration, control simulation useful signal trap submodule 81 carries out trap to be handled, described running parameter comprises the working frequency points of each carrier wave, and the bandwidth of the working signal on each working frequency points, or the like.
Simulation width of cloth phase compensating module 803 is used for that the signal by 802 inputs of simulation useful signal trap module is carried out the width of cloth and compensates mutually.This module is optional, when selecting for use, can make simulation offset module 73 and carry out interference signal better and offset processing.Simulation width of cloth phase compensating module 803 comprises that the simulation width of cloth compensates submodule 83 and best simulation width of cloth penalty coefficient calculating sub module 84 mutually mutually.
The simulation width of cloth compensates submodule 83 mutually, is used for the best width of cloth phase penalty coefficient according to 84 inputs of best simulation width of cloth phase penalty coefficient calculating sub module, the signal by 81 inputs of simulation useful signal trap submodule is carried out the width of cloth compensate mutually.Carrying out that the width of cloth compensates mutually is the carrier/interface ratio maximum that offsets the back signal through simulation useful signal trap module 802 in order to make.The ratio of the power sum that described carrier/interface ratio refers to each carrier signal and total interfering signal power.
Best simulation width of cloth phase penalty coefficient calculating sub module 84, calculating optimum simulation width of cloth phase penalty coefficient sends the simulation width of cloth to and compensates submodule 83 mutually.Described calculating optimum simulation width of cloth phase penalty coefficient is: according to situation of change, the work at present parameter between useful signal and the interference signal in the signal of ADC705 output, and the width of cloth phase compensation way in the simulation width of cloth phase compensating module etc., the width of cloth of calculating optimum simulation adaptively phase penalty coefficient.
Simulation width of cloth phase compensating module 803 can also place on the main channel.For example, place simulation compensation of delay module 801 and simulation to offset between the module 73, perhaps place before the simulation compensation of delay module 801.
Simulate and offset module 73, be used for the signal of main channel 71 inputs and the signal cancellation of feedforward branch road 72 inputs, the signal that disappears mutually after the processing that disappeared mutually.
Referring to Figure 14, for offset the signal schematic representation after the module 73 through simulation among Fig. 7 b, as shown in Figure 14, the interference signal that offsets through simulation in the signal of module 73 is cut down greatly.Figure 14 is the signal after process band pass filter and the interference cancellation, and with shown in Figure 6 only the comparing through the signal of band pass filter of prior art, as seen, the interference signal among Figure 14 in the useful signal bandwidth is cut down greatly.Like this, in the time need amplifying useful signal by the gain that increases the simulation receive path, because interference signal is cut down greatly, even amplify and amplified interference signal useful the time, interference signal after also can not occurring amplifying makes the problem of ADC705 overload, thereby, receiver performance is not affected.
Realize interference cancellation module 704 by the simulation feed forward approach, the working frequency points of 802 pairs of each carrier waves of simulation useful signal trap module and the adjustment of bandwidth are dumb.The number of the trap module of composition simulation useful signal trap module 802, the centre frequency and the bandwidth of each trap module determine all that generally being difficult to increases new trap module, also is difficult to change the centre frequency and the bandwidth of each trap module.Though forming the centre frequency and the bandwidth of each trap module of simulation useful signal trap module 802 in theory can be by certain mode such as voltage controlled capacitor, in certain scope, finely tune, but be limited in scope, precision is not high, and needing to use very complicated circuit to realize the change of center frequency-band and bandwidth, this trap module that causes being difficult in the practice forming simulation useful signal trap module 802 is adjusted.
For solving the problem that the simulation feed forward approach is brought to receiver, the embodiment of the invention has proposed to realize by the digital feed forward method scheme of interference cancellation module 704.The digital feed forward method can realize on digital intermediate frequency, also can realize on digital baseband, describes respectively below in conjunction with Figure 15 and Figure 16.
Referring to Figure 15, be the structural representation of second execution mode of interference cancellation module 704 among Fig. 7, it is similar with the corresponding module among Fig. 8 that simulation compensation of delay module 1501 wherein and simulation offset module 73, repeats no more here.
If the saturation point of feedforward ADC1505 and ADC705 is identical, then selecting attenuation module 1504 is in order to expand the saturation point of feedforward branch road, and described saturation point is the incoming signal level that makes ADC saturated.Attenuation module 1504 can be made the fixed attenuation mode, also can make automatic decay mode with further raising performance, described automatic decay mode is automatic gain control (AGC, automatic gain control) mode, this AGC mode can be used the feedfoward control mode, also can use feedback controling mode.If during feedback controling mode, with the feedforward ADC1505 output feed back to attenuation module 1504, as shown in phantom in FIG..
Feedforward ADC1505, being used for the conversion of signals by attenuation module 1504 inputs is digital signal, the digital signal after the conversion is sent to digital intermediate frequency useful signal trap module 1502.
Digital intermediate frequency useful signal trap module 1502 comprises digital intermediate frequency useful signal trap submodule 151 and digital intermediate frequency trap characteristic control submodule 152, is used for that the carrier signal of input signal is carried out trap and handles, and extracts interference signal.Digital intermediate frequency useful signal trap module 1502 is similar with simulation useful signal trap module 802, and different is to realize the trap processing on digital intermediate frequency, repeats no more here.
Digital intermediate frequency width of cloth phase compensating module 1503 comprises that the digital intermediate frequency width of cloth compensates submodule 153 and optimal digital intermediate frequency width of cloth penalty coefficient calculating sub module 154 mutually mutually, is used for that the feedforward tributary signal by 1502 inputs of digital intermediate frequency useful signal trap module is carried out the width of cloth and compensates mutually.Compensating module 803 is similar mutually with the simulation width of cloth for digital intermediate frequency width of cloth phase compensating module 1503, and different is to realize that on digital intermediate frequency the width of cloth compensates mutually.For example, digital intermediate frequency width of cloth phase compensating module submodule 153 can realize that correspondingly, the optimum number horizontal or vertical scroll of calligraphy phase penalty coefficient that optimal digital intermediate frequency width of cloth phase penalty coefficient calculating sub module 154 calculates is a filter coefficient by FIR or iir digital filter.And the simulation width of cloth compensates submodule 83 mutually and can realize by attenuator and phase shifter, correspondingly, the best simulation width of cloth phase coefficient that calculates of best simulation width of cloth phase penalty coefficient calculating sub module 84 is the controlled quentity controlled variable according to the analog or digital of attenuation and amount of phase shift configuration.
Digital to analog converter (DAC, Digital to Analogue Converter) 1506, the conversion of signals that is used for being compensated submodule 153 inputs mutually by the digital intermediate frequency width of cloth is an analog signal, and described analog signal is sent to intermediate frequency filtering module 1507.
Intermediate frequency filtering module 1507 is used for the signal by 1506 inputs of DAC module is carried out Filtering Processing.After intermediate frequency filtering module 1507, obtain the analog if signal that filtering digital micromirror picture disturbs.Intermediate frequency filtering module 1507 can realize by the LC filter.
Up-conversion module 1508 is used for the signal by 1507 inputs of intermediate frequency filtering module is carried out upconversion process, sends the signal after the up-conversion to simulation and offsets module 73.The frequency of the signal of DAC module 1506 outputs and the frequency of main channel signal may be identical, also may be different.If different, then need the intermediate-freuqncy signal of 1508 pairs of DAC modules of up-conversion module, 1506 outputs be transformed to the main channel in identical intermediate-freuqncy signal; If identical, then do not need up-conversion module 1508.
Referring to Figure 16, structural representation for the 3rd execution mode of interference cancellation module 704 among Fig. 7, it is similar with the corresponding module among Fig. 8 that simulation compensation of delay module 1601 wherein and simulation offset module 73, attenuation module 1604, feedforward ADC1605, control the digital baseband useful signal trap module 1602 that submodule 162 is formed by digital baseband useful signal trap submodule 161 and digital baseband trap characteristic, compensate submodule 163 and the optimal digital base band width of cloth digital baseband width of cloth phase compensating module 1603 formed of penalty coefficient calculating sub module 164 mutually mutually by the digital baseband width of cloth, DAC1606, intermediate frequency filtering module 1607 and up-conversion module 1608 are similar with the corresponding module among Figure 15, repeat no more here.
Digital Down Converter Module 1609 is used for the signal by feedforward ADC1605 input is down-converted to baseband signal, sends the described baseband signal after the down-conversion to digital decimation filtration module 1610.
Digital decimation filtration module 1610 is used for that the signal by Digital Down Converter Module 1609 inputs is carried out filtering extraction and handles, and sends the signal after handling to digital baseband useful signal trap module 1602.
Digital interpolative filtration module 1611 is used for that the signal that is compensated submodule 163 inputs by the digital baseband width of cloth is mutually carried out filtering interpolation and handles, and sends the signal after handling to Digital Up Convert module 1612.
Digital Up Convert module 1612 is used for the signal by 1611 inputs of digital interpolative filtration module is carried out upconversion process, and the signal after the up-conversion is sent to DAC1606.The signal that transmits between Digital Down Converter Module 1609 and the Digital Up Convert module 1612 is a digital complex signal, i.e. the IQ signal.
Alternatively, increase the AGC module before the ADC705.Offset offseting of module 73 when incomplete in simulation like this, make ADC be unlikely overload, do not produce big nonlinear distortion, this is favourable to optimal digital intermediate frequency width of cloth phase penalty coefficient calculating sub module 154 or optimal digital base band width of cloth phase penalty coefficient calculating sub module 164 calculating optimum width of cloth phase penalty coefficients.AGC can be the feed-forward AGC of analog detection, the feedback AGC of analog detection, the feedback AGC of Digital Detecting or the real-time switching of step gain branch road etc.
Below the digital feed forward method that realizes on the digital feed forward method that realizes on the digital intermediate frequency and the digital baseband is compared:
Take on the digital feed forward method feedforward branch road digital resource maximum be digital baseband useful signal trap module 1602 and digital baseband width of cloth compensating module 1603 mutually, perhaps digital intermediate frequency useful signal trap module 1502 and digital intermediate frequency width of cloth compensating module 1503 mutually.The benefit of the digital feed forward method that realizes on the digital baseband is that digital decimation filtration module 1610 will carry out the signal of filtering extraction after handling and send digital baseband useful signal trap module 1602 to and carry out trap and handle, send digital baseband width of cloth phase compensating module 1603 again to and carry out the compensation deals of width of cloth phase, the characteristics lower according to the frequency of baseband signal can significantly reduce digital resource.
But, owing to use the digital feed forward method that realizes on the digital baseband on the feedforward branch road, to increase processing links, correspondingly having increased the processing time-delay on the feedforward branch road, this has just strengthened the realization difficulty of simulation compensation of delay module 1601.
Therefore, under resource-constrained situation, can consider the digital feed forward method that realizes on the digital baseband, under the limited situation of the time-delay of feedforward branch road, can pay the utmost attention to the digital feed forward method that realizes on the digital intermediate frequency.
Realize interference cancellation module 704 by the digital feed forward method, owing to realize the feedforward branch road by numeric field, the adjustment of digital intermediate frequency useful signal trap module 1502 or 1602 pairs of frequencies of digital baseband useful signal trap module and bandwidth is very flexible, and the filter factor of the digital notch module of change composition digital intermediate frequency useful signal trap module 1502 or digital baseband useful signal trap module 1602 gets final product during adjustment.And the centre frequency of the number of digital notch module, each digital notch module and bandwidth all are variable, can increase new trap point, just increase new digital notch module.Scheme by digital feed forward method realization interference cancellation module 704 has the following advantages:
(1) can on former receiver, change business configuration.Form by 4 digital traps such as, the digital intermediate frequency useful signal trap module 1502 of original receiver or digital baseband useful signal trap module 1602, just can hold 4 carrier waves at most.Because power system capacity enlarges, and can easily 4 carrier waves be upgraded to 5,6 carrier waves or more a plurality of carrier wave.
(2) can between multiple standard, switch.Such as, need be with receiver from receiving the GSM mode switch to receiving the WCDMA pattern, owing to can change the centre frequency and the bandwidth of the digital notch module of forming digital intermediate frequency useful signal trap module 1502 or digital baseband useful signal trap module 1602 easily, switch and get up easily.
(3) can support frequency hopping work.Owing to can change the parameter configuration of the digital notch module of forming digital intermediate frequency useful signal trap module 1502 or digital baseband useful signal trap module 1602 on the numeral easily, and can guarantee to change with signal Synchronization ground, so can support frequency hopping work.
(4) the digital width of cloth of digital intermediate frequency width of cloth phase compensating module 1503 or digital baseband width of cloth phase compensating module 1603 compensates mutually and can realize by different modes.Such as equalization filtering in the band, just each carrier frequency point is all carried out the different width of cloth and compensate mutually, and for the simulation feed forward approach, identical to the adjustment of amplitude in the useful signal bandwidth and phase characteristic.And the digital width of cloth compensates mutually and can carry out the accurate width of cloth and compensate mutually, and this has improved the cancellation performance that simulation offsets module 73.
(5) there is not the device aging problem in the digital notch module of composition digital intermediate frequency useful signal trap module 1502 or digital baseband useful signal trap module 1602, has guaranteed the trap performance.
The foregoing description is based on the hypothesis that offsets on the ADC705 intermediate frequency before, and just simulating has one or more levels mixing in the receive path 703, and through no longer including mixing after the interference cancellation module 704.Jamproof scheme also can be used following situation in the receiver of the embodiment of the invention: offset on the radio frequency before the ADC705; In the simulation receive path 703 multistage intermediate frequency is arranged, at this moment, do not offset and on that grade intermediate frequency, realize, and on certain grade of intermediate frequency of more close antenna 701, realize near ADC705.
Referring to Figure 17, the exemplary process diagram of anti-disturbance method in the embodiment of the invention receiver, this method may further comprise the steps:
The pending signal of input receiver described in the step 11 can for, the signal of telecommunication in the receiver is carried out signal after the bandpass filtering treatment.
The pending signal of input receiver described in the step 11 can be the signal of telecommunication.At this moment, before the step 12, this method comprises: the described signal that offsets after the processing is carried out bandpass filtering treatment, obtain the signal after the bandpass filtering treatment; Correspondingly, step 12 is: with the conversion of signals after the described bandpass filtering treatment is digital signal.
Referring to Figure 18, be the flow chart of anti-disturbance method example one in the embodiment of the invention receiver, this method may further comprise the steps:
The specific descriptions of each step shown in Figure 180 are referring to the associated description of Fig. 8.
Referring to Figure 19, be the flow chart of anti-disturbance method example two in the embodiment of the invention receiver, this method may further comprise the steps:
The specific descriptions of each step shown in Figure 19 are referring to the associated description of Figure 15.
Referring to Figure 20, be the flow chart of anti-disturbance method example three in the embodiment of the invention receiver, this method may further comprise the steps:
Step 411 is an analog signal with the conversion of signals after the described up-conversion.
Step 412 is carried out Filtering Processing to described analog signal, obtains the signal after the Filtering Processing.
Step 413 is carried out upconversion process to the signal after the described Filtering Processing, obtains the signal after the up-conversion.This step is optional.
The specific descriptions of each step shown in Figure 20 are referring to the associated description of Figure 16.
Jamproof scheme not only can apply to can also apply in the single-carrier receiver in the multi-carrier receiver in the embodiment of the invention receiver.
Jamproof scheme in the embodiment of the invention receiver, by the interference signal in the useful signal bandwidth in the signal of receiver is offseted processing, obtain offseting the signal that disappears mutually after the processing, like this, suppressed the interference signal in the useful signal bandwidth in the receiver, thereby, improved systematic function.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (23)
1. an anti-interference receiver is characterized in that, this receiver comprises the interference cancellation module, and the interference signal that is used for treating in the useful signal bandwidth of processing signals offsets processing, and output offsets the signal after the processing.
2. receiver as claimed in claim 1 is characterized in that, described interference cancellation module comprises that main channel, feedforward branch road and simulation offset module;
Described main channel is used to receive pending signal, exports to described simulation and offsets module;
Described feedforward branch road, the useful signal that is used for treating processing signals carries out trap to be handled, and sends the signal after handling to described simulation and offsets module;
Described simulation offsets module, is used for signal that described main channel is transmitted and the signal that described feedforward branch road transmits and offsets, and the signal that offsets after the processing is exported.
3. receiver as claimed in claim 2 is characterized in that, described main channel comprises simulation compensation of delay module, is used for the signal of input main channel is carried out the compensation of delay processing, sends the signal after handling to described simulation and offsets module.
4. receiver as claimed in claim 2 is characterized in that, described main channel comprises simulation width of cloth phase compensating module, is used for that the signal on the main channel is carried out the width of cloth and compensates mutually;
Described feedforward branch road comprises simulation useful signal trap module, and the useful signal that is used for treating processing signals carries out trap to be handled, and sends the signal after handling to simulation and offsets module.
5. receiver as claimed in claim 2 is characterized in that, described feedforward branch road comprises simulation useful signal trap module and simulates width of cloth compensating module mutually;
Described simulation useful signal trap module, the useful signal that is used for treating processing signals carries out trap to be handled, and sends the signal after handling to simulation width of cloth phase compensating module;
Described simulation width of cloth phase compensating module is used for that the signal by described simulation useful signal trap module input is carried out the width of cloth and compensates mutually, and the signal after the width of cloth is compensated mutually sends described simulation to and offsets module.
6. receiver as claimed in claim 5 is characterized in that, described simulation useful signal trap module comprises simulation useful signal trap submodule and simulation trap characteristic control submodule; Described simulation width of cloth phase compensating module comprises that the simulation width of cloth compensates submodule and best simulation width of cloth penalty coefficient calculating sub module mutually mutually;
Described simulation useful signal trap submodule is used for the useful signal in the described pending signal being carried out trap handling under the control of described simulation trap characteristic control submodule;
Described simulation trap characteristic control submodule is used to control described simulation useful signal trap submodule and carries out the trap processing;
The described simulation width of cloth compensates submodule mutually, be used for best width of cloth phase penalty coefficient according to described best simulation width of cloth phase penalty coefficient calculating sub module input, signal by described simulation useful signal trap submodule input is carried out the width of cloth compensate mutually, the signal after the width of cloth is compensated mutually sends described simulation to and offsets module;
Described best simulation width of cloth phase penalty coefficient calculating sub module is used for calculating optimum simulation width of cloth phase penalty coefficient.
7. receiver as claimed in claim 2 is characterized in that, described feedforward branch road comprises feedforward ADC, digital intermediate frequency useful signal trap module, digital intermediate frequency width of cloth phase compensating module, digital to analog converter DAC and intermediate frequency filtering module;
Described feedforward ADC, being used for described pending conversion of signals is digital signal, sends described digital intermediate frequency useful signal trap module to;
Described digital intermediate frequency useful signal trap module is used for that the useful signal by the signal of described feedforward ADC input is carried out trap and handles, and sends the signal after handling to digital intermediate frequency width of cloth phase compensating module;
Described digital intermediate frequency width of cloth phase compensating module is used for that the signal by described digital intermediate frequency useful signal trap module input is carried out the width of cloth and compensates mutually, and the signal after the width of cloth is compensated mutually sends described D/A converter module DAC to;
Described DAC, being used for the conversion of signals by described digital intermediate frequency width of cloth phase compensating module input is analog signal, and described analog signal is sent to described intermediate frequency filtering module;
Described intermediate frequency filtering module is used for the signal by described DAC input is carried out Filtering Processing, sends the signal after handling to described simulation and offsets module.
8. receiver as claimed in claim 7 is characterized in that, described digital intermediate frequency useful signal trap module comprises digital intermediate frequency useful signal trap submodule and digital intermediate frequency trap characteristic control submodule; Described digital intermediate frequency width of cloth phase compensating module comprises that the digital intermediate frequency width of cloth compensates submodule and optimal digital intermediate frequency width of cloth penalty coefficient calculating sub module mutually mutually;
Described digital intermediate frequency useful signal trap submodule, be used under the control of described digital intermediate frequency trap characteristic control submodule, handle carrying out trap, send the signal after handling to the described digital intermediate frequency width of cloth and compensate submodule mutually by the useful signal in the signal of described feedforward ADC input;
Described digital intermediate frequency trap characteristic control submodule is used to control described digital intermediate frequency useful signal trap submodule and carries out the trap processing;
The described digital intermediate frequency width of cloth compensates submodule mutually, be used for best width of cloth phase penalty coefficient according to described optimal digital intermediate frequency width of cloth phase penalty coefficient calculating sub module input, signal by described digital intermediate frequency useful signal trap submodule input is carried out the width of cloth compensate mutually, the signal after the width of cloth is compensated mutually sends described DAC to;
Described optimal digital intermediate frequency width of cloth phase penalty coefficient calculating sub module is used to calculate optimal digital intermediate frequency width of cloth phase penalty coefficient.
9. as claim 7 or 8 described receivers, it is characterized in that this receiver also comprises the attenuation module that links to each other with described feedforward ADC, described intermediate frequency filtering module and described simulation offset and comprise the up-conversion module between the module;
Described attenuation module is used to treat processing signals and carries out attenuation processing, and the signal after handling is inputed to described feedforward ADC;
Described up-conversion module is used for the signal by described intermediate frequency filtering module input is carried out upconversion process, sends the signal after the upconversion process to described simulation and offsets module.
10. receiver as claimed in claim 2, it is characterized in that described feedforward branch road comprises feedforward ADC, Digital Down Converter Module, digital decimation filtration module, digital baseband useful signal trap module, digital baseband width of cloth phase compensating module, digital interpolative filtration module, Digital Up Convert module, DAC and intermediate frequency filtering module;
Described feedforward ADC, being used for described pending conversion of signals is digital signal, sends described Digital Down Converter Module to;
Described Digital Down Converter Module is used for the signal by described feedforward ADC input is down-converted to baseband signal, sends the signal after the down-conversion to described digital decimation filtration module;
Described digital decimation filtration module is used for that the signal by described Digital Down Converter Module input is carried out filtering extraction and handles, and sends the signal after handling to described digital baseband useful signal trap module;
Described digital baseband useful signal trap module is used for that the useful signal by the signal of described digital decimation filtration module input is carried out trap and handles, and sends the signal after handling to digital baseband width of cloth phase compensating module;
Described digital baseband width of cloth phase compensating module is used for that the signal by described digital baseband useful signal trap module input is carried out the width of cloth and compensates mutually, and the signal after the width of cloth is compensated mutually sends described digital interpolative filtration module to;
Described digital interpolative filtration module is used for that the signal by described digital baseband width of cloth phase compensating module input is carried out filtering interpolation and handles, and sends the signal after handling to described Digital Up Convert module;
Described Digital Up Convert module is used for the signal by described digital interpolative filtration module input is carried out upconversion process, and the signal after the up-conversion is sent to described DAC;
Described DAC, being used for the conversion of signals by described Digital Up Convert module input is analog signal, sends the signal after the conversion to described intermediate frequency filtering module;
Described intermediate frequency filtering module is used for the signal by described DAC input is carried out Filtering Processing, sends the signal after handling to described simulation and offsets module.
11. receiver as claimed in claim 10 is characterized in that, described digital baseband useful signal trap module comprises digital baseband useful signal trap submodule and digital baseband trap characteristic control submodule; Described digital baseband width of cloth phase compensating module comprises that the digital baseband width of cloth compensates submodule and optimal digital base band width of cloth penalty coefficient calculating sub module mutually mutually;
Described digital baseband useful signal trap submodule, be used under the control of described digital baseband trap characteristic control submodule, handle carrying out trap, send the signal after handling to the described digital baseband width of cloth and compensate submodule mutually by the useful signal in the signal of described digital decimation filtration module input;
Described digital baseband trap characteristic control submodule is used to control described digital baseband useful signal trap submodule and carries out the trap processing;
The described digital baseband width of cloth compensates submodule mutually, be used for best width of cloth phase penalty coefficient according to described optimal digital base band width of cloth phase penalty coefficient calculating sub module input, signal by described digital baseband useful signal trap submodule input is carried out the width of cloth compensate mutually, the signal after the width of cloth is compensated mutually sends described digital interpolative filtration module to;
Described optimal digital base band width of cloth phase penalty coefficient calculating sub module is used for calculating optimum digital baseband width of cloth phase penalty coefficient.
12., it is characterized in that this receiver also comprises the attenuation module that links to each other with described feedforward ADC as claim 10 or 11 described receivers, described intermediate frequency filtering module and described simulation offset and comprise the up-conversion module between the module;
Described attenuation module is used for described pending signal is carried out attenuation processing, and the signal after handling is inputed to described feedforward ADC;
Described up-conversion module is used for the signal by the input of intermediate frequency filtering module is carried out upconversion process, sends the signal after handling to described simulation and offsets module.
13. receiver as claimed in claim 1 is characterized in that, described pending signal is interior antenna of receiver and the signal between the analog to digital converter.
14. jamproof device in the receiver is characterized in that, this device comprises that main channel, feedforward branch road and simulation offset module;
Described main channel is used to receive pending signal, exports to described simulation and offsets module;
Described feedforward branch road, the useful signal that is used for treating processing signals carries out trap to be handled, and sends the signal after handling to described simulation and offsets module;
Described simulation offsets module, and described main channel signal that transmits and the signal that described feedforward branch road transmits are offseted, and the signal that offsets after the processing is exported.
15. device as claimed in claim 14 is characterized in that, described main channel comprises simulation compensation of delay module, is used for the signal of input main channel is carried out the compensation of delay processing, sends the signal after handling to described simulation and offsets module.
16. anti-disturbance method in the receiver is characterized in that, this method comprises:
Interference signal in the useful signal bandwidth in the pending signal of input receiver is offseted processing, obtain offseting the signal after the processing.
17. method as claimed in claim 16 is characterized in that, described offset to handle comprise:
Pending signal is divided into main channel signal and feedforward tributary signal;
Useful signal in the described feedforward tributary signal is carried out trap to be handled;
Signal cancellation after described main channel signal and described trap handled, the signal after disappearing mutually are the described signal that offsets after the processing.
18. method as claimed in claim 17 is characterized in that, described signal with input receiver is divided into after main channel signal and the feedforward tributary signal, and this method comprises:
Described main channel signal is carried out compensation of delay handle, obtain the signal after compensation of delay is handled;
Described signal cancellation after described main channel signal and described trap are handled is: the signal cancellation after signal after described compensation of delay is handled and described trap are handled.
19. method as claimed in claim 18 is characterized in that, describedly useful signal in the described feedforward tributary signal is carried out trap comprises after handling:
Signal after the trap processing is carried out the width of cloth compensate mutually, obtain the signal after the width of cloth compensates mutually;
Described signal after described compensation of delay is handled with signal cancellation after described trap is handled is: signal after described compensation of delay is handled and signal cancellation after the described width of cloth compensates mutually.
20. method as claimed in claim 18 is characterized in that, describedly useful signal in the described feedforward tributary signal is carried out trap comprises before handling: described feedforward tributary signal is converted to digital signal;
Describedly useful signal in the described feedforward tributary signal is carried out trap be treated to: the useful signal in the digital signal after the described conversion is carried out trap handle;
Described useful signal in the digital signal after the described conversion is carried out after trap handles, this method comprises:
Signal after the trap processing is carried out the width of cloth compensate mutually, obtain the signal after the width of cloth compensates mutually;
Conversion of signals after the described width of cloth compensated mutually is an analog signal;
Described analog signal is carried out Filtering Processing, obtain the signal after the Filtering Processing;
Described signal and the signal cancellation of described trap after handling after described compensation of delay is handled is: signal after described compensation of delay is handled and the signal cancellation after the Filtering Processing.
21. method as claimed in claim 20 is characterized in that, described described feedforward tributary signal is converted to before the digital signal, this method comprises:
Described feedforward tributary signal is carried out attenuation processing, obtain the signal after the attenuation processing;
Describedly described feedforward tributary signal is converted to digital signal is: with the conversion of signals after the described attenuation processing is digital signal;
Described described analog signal is carried out after the Filtering Processing, this method comprises: the signal after the described Filtering Processing is carried out upconversion process, obtain the signal after the up-conversion;
Described signal and the signal cancellation after the Filtering Processing after described compensation of delay is handled is: signal after described compensation of delay is handled and the signal cancellation after the described up-conversion.
22. method as claimed in claim 18 is characterized in that, describedly useful signal in the described feedforward tributary signal is carried out trap comprises before handling: described feedforward tributary signal is converted to digital signal;
With the digital signal down variable frequency that is converted to is baseband signal;
Described baseband signal is carried out filtering extraction handle, obtain the signal after filtering extraction is handled;
Describedly useful signal in the described feedforward tributary signal is carried out trap be treated to: the useful signal in the signal after described filtering extraction is handled carries out trap to be handled;
Useful signal in the described signal after described filtering extraction is handled carries out after trap handles, and this method comprises:
Signal after the trap processing is carried out the width of cloth compensate mutually, obtain the signal after the width of cloth compensates mutually;
Signal after the described width of cloth compensated mutually carries out filtering interpolation to be handled, and obtains the signal after filtering interpolation is handled;
Signal after described filtering interpolation handled carries out upconversion process, obtains the signal after the up-conversion;
With the conversion of signals after the described up-conversion is analog signal;
Described analog signal is carried out Filtering Processing, obtain the signal after the Filtering Processing;
Described signal and the signal cancellation of described trap after handling after described compensation of delay is handled is: signal after described compensation of delay is handled and the signal cancellation after the described Filtering Processing.
23. the method as claim 22 is stated is characterized in that, described described feedforward tributary signal is converted to before the digital signal, this method comprises:
Described feedforward tributary signal is carried out attenuation processing, obtain the signal after the attenuation processing;
Describedly described feedforward tributary signal is converted to digital signal is: with the conversion of signals after the described attenuation processing is digital signal;
Described described analog signal is carried out after the Filtering Processing, this method comprises: the signal after the described Filtering Processing is carried out upconversion process, obtain the signal after the up-conversion;
Described after described compensation of delay is handled signal and the signal cancellation after the described Filtering Processing be: signal after described compensation of delay is handled and the signal cancellation after the described up-conversion.
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| CN2007101357976A CN101119121B (en) | 2007-08-21 | 2007-08-21 | Anti-interference method in receiver, anti-interference receiver and anti-interference device |
| PCT/CN2008/072050 WO2009024085A1 (en) | 2007-08-21 | 2008-08-19 | Anti-interference mehod for receiver, anti-interference receiver and anti-interference device |
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| CN2007101357976A CN101119121B (en) | 2007-08-21 | 2007-08-21 | Anti-interference method in receiver, anti-interference receiver and anti-interference device |
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| WO2009024085A1 (en) * | 2007-08-21 | 2009-02-26 | Huawei Technologies Co., Ltd. | Anti-interference mehod for receiver, anti-interference receiver and anti-interference device |
| CN101815054A (en) * | 2010-04-06 | 2010-08-25 | 京信通信***（中国）有限公司 | Digital communication system and method for improving flatness in signal band thereof |
| CN102196536A (en) * | 2010-03-17 | 2011-09-21 | 鼎桥通信技术有限公司 | Method for realizing signal scanning and analysis by utilizing base station |
| CN102307174A (en) * | 2011-09-09 | 2012-01-04 | 北京交通大学 | Low density trap wave point setting method |
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| CN102790743B (en) * | 2011-03-24 | 2016-11-30 | 索尼公司 | Receiver and method |
| WO2017219909A1 (en) * | 2016-06-22 | 2017-12-28 | 贝思特宽带通讯(烟台)有限公司 | Novel low-noise indoor/outdoor antenna amplifier |
| 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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| CN100505561C (en) * | 2006-02-20 | 2009-06-24 | 华为技术有限公司 | Digital receiver |
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| WO2009024085A1 (en) * | 2007-08-21 | 2009-02-26 | Huawei Technologies Co., Ltd. | Anti-interference mehod for receiver, anti-interference receiver and anti-interference device |
| CN102196536B (en) * | 2010-03-17 | 2013-07-10 | 鼎桥通信技术有限公司 | Method for realizing signal scanning and analysis by utilizing base station |
| CN102196536A (en) * | 2010-03-17 | 2011-09-21 | 鼎桥通信技术有限公司 | Method for realizing signal scanning and analysis by utilizing base station |
| CN101815054A (en) * | 2010-04-06 | 2010-08-25 | 京信通信***（中国）有限公司 | Digital communication system and method for improving flatness in signal band thereof |
| CN101815054B (en) * | 2010-04-06 | 2012-09-26 | 京信通信***（中国）有限公司 | Digital communication system and method for improving flatness in signal band thereof |
| CN102790743B (en) * | 2011-03-24 | 2016-11-30 | 索尼公司 | Receiver and method |
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| CN102739584A (en) * | 2011-04-02 | 2012-10-17 | 鼎桥通信技术有限公司 | Method and device for inhibiting local oscillator leakage |
| CN102739584B (en) * | 2011-04-02 | 2015-04-29 | 鼎桥通信技术有限公司 | Method and device for inhibiting local oscillator leakage |
| CN102307174A (en) * | 2011-09-09 | 2012-01-04 | 北京交通大学 | Low density trap wave point setting method |
| CN102307174B (en) * | 2011-09-09 | 2013-04-24 | 北京交通大学 | Low density trap wave point setting method |
| 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 |
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| CN101119121B (en) | 2010-08-25 |
| WO2009024085A1 (en) | 2009-02-26 |
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