CN101436876A - Method and system for cancellation of test signal - Google Patents
Method and system for cancellation of test signal Download PDFInfo
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- CN101436876A CN101436876A CNA2008102176879A CN200810217687A CN101436876A CN 101436876 A CN101436876 A CN 101436876A CN A2008102176879 A CNA2008102176879 A CN A2008102176879A CN 200810217687 A CN200810217687 A CN 200810217687A CN 101436876 A CN101436876 A CN 101436876A
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Abstract
The invention discloses a method and a system for cancelling test signals. The system comprise a test signal cancellation module for receiving digital test signals sent by a test signal generator, and eliminating a test signal component in the digital signals output by a receiver, so as to avoid influence of the test signal component on subsequent service signals.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of method and system that offsets test signal.
Background technology
The receiver block diagram as shown in Figure 1 in the wireless communication system, the radiofrequency signal that antenna receives, deliver to analog receiver by duplexer, amplify and be converted to after low-frequency analog signal, be sent to ADC (Analog to Digital Converter, analog to digital converter), be converted to digital signal, after digital receiver carries out digital filtering, extract to handle digital signal then, digital signal is converted into digital baseband signal.
Because wireless communication receiver has imperfection, prior art adopts usually at receiver inlet injects analog test signal, with the digital form input channel correction module of analog test signal correspondence, calculate the non-ideal characteristic of passage, the output signal of receiver is proofreaied and correct.Concrete, a kind of receiver is proofreaied and correct block diagram as shown in Figure 2, comprise the test signal generation device, this device produces the test signal of a definite form, and at receiver inlet, form with coupler or resistor network is mixed mutually with input signal, delivers to the input of receiver again, finishes the test signal injection process.The test signal generation device is also delivered to the channel correcting module with the digital test signal corresponding with analog test signal, is used for the non-ideal characteristic that the channel correcting module calculates passage, and implements corresponding the correction.The effect of delivering to the digital test signal of channel correcting module just is used for comparing with the test signal of having passed through receiver, thereby obtains the receiver channel characteristic, and then contrary with the characteristic of receiver, and receiver is proofreaied and correct.But receiver is proofreaied and correct in the digital signal of exporting the back and is still contained the test signal component, and this test signal component has brought interference to follow-up service signal.
Summary of the invention
The embodiment of the invention provides a kind of method and system that offsets test signal, has eliminated the test signal component that comprises in the digital signal of receiver output, the influence of having avoided the test signal component that the follow-up business signal is brought.
The embodiment of the invention provides a kind of system that offsets test signal, comprises coupler, analog receiver, and analog to digital converter, digital receiver, the test signal generator, the channel correcting device comprises that also test signal offsets device, wherein,
Described test signal generator is used to produce analog test signal and the digital test signal corresponding with described analog test signal, and described analog test signal is sent to described coupler, described digital test signal is sent to described test signal offset device;
Described coupler, the described analog test signal that is used for receiving injects analog input signal;
Described analog receiver, the described analog input signal that is used for having mixed described analog test signal sends to described analog to digital converter;
Described analog to digital converter is used for converting the described described analog input signal that has mixed described analog test signal to digital signal, comprises the test signal component in the described digital signal;
Described digital receiver is used to receive described digital signal, and described digital signal is sent to the channel correcting device;
Described channel correcting device is used to receive the digital signal that described digital receiver sends, and described digital signal is proofreaied and correct;
Described test signal offsets device, is used to receive the digital signal of described channel correcting device output and the digital test signal that described test signal generator sends, and eliminates the test signal component that comprises in the digital signal of described channel correcting device output.
The embodiment of the invention also provides a kind of system that offsets test signal, comprises coupler, analog receiver, and analog to digital converter, digital receiver, the test signal generator, the channel correcting device comprises that also test signal offsets device, wherein,
Described test signal generator is used to produce analog test signal and the digital test signal corresponding with described analog test signal, and described analog test signal is sent to described coupler, described digital signal is sent to described test signal offset device;
Described coupler, the described analog test signal that is used for receiving injects analog input signal;
Described analog receiver, the described analog input signal that is used for having mixed described analog test signal sends to described analog to digital converter;
Described analog to digital converter is used for converting the described described analog input signal that has mixed described analog test signal to digital signal, comprises the test signal component in the described digital signal;
Described digital receiver is used to receive described digital signal, described digital signal is sent to described test signal offset device;
Described test signal offsets device, is used to receive the digital signal of described digital receiver transmission and the described digital test signal that described test signal generator sends, and eliminates the test signal component that comprises in the digital signal of described digital receiver output;
Described channel correcting device is used to receive the digital signal that described test signal offsets device output, and described digital signal is proofreaied and correct.
The embodiment of the invention provides a kind of method that offsets test signal, comprising:
Test signal offsets the digital test signal of device acceptance test signal generator transmission and the digital signal of channel correcting device output, and balanced described digital test signal wherein, comprises the test signal component in the digital signal of described channel correcting device output;
Test signal offsets device the digital signal of described channel correcting device output and the described digital test signal after the equilibrium is offseted, and eliminates the described test signal component that comprises in the described digital signal.
The embodiment of the invention also provides a kind of method that offsets test signal, comprising:
Test signal offsets the digital test signal of device acceptance test signal generator transmission and the digital signal of digital receiver output, and balanced described digital test signal wherein, comprises the test signal component in the digital signal of described digital receiver output;
Test signal offsets device the digital signal of described digital receiver output and the described digital test signal after the equilibrium is offseted, and eliminates the described test signal component that comprises in the described digital signal.
The embodiment of the invention offsets device by adding test signal, the test signal component that comprises in the digital signal of cancellation receiver output, the influence of having avoided the test signal component that the follow-up business signal is brought.
Description of drawings
Fig. 1 is a receiver block diagram in the wireless communication system;
Fig. 2 is that a kind of receiver is proofreaied and correct block diagram;
Fig. 3 is a kind of system block diagram that offsets test signal that the embodiment of the invention provides;
Fig. 4 is the block diagram that a kind of test signal that the embodiment of the invention provides offsets device;
Fig. 5 is the system block diagram that another kind that the embodiment of the invention provides offsets test signal;
Fig. 6 is that a kind of test signal offsets the device block diagram under the multicarrier state that provides of the embodiment of the invention;
Fig. 7 is the system block diagram that another kind that the embodiment of the invention provides offsets test signal;
Fig. 8 is the system block diagram that another kind that the embodiment of the invention provides offsets test signal;
Fig. 9 is a kind of method that offsets test signal that the embodiment of the invention provides;
Figure 10 is the method that another kind that the embodiment of the invention provides offsets test signal.
Embodiment
The embodiment of the invention provides a kind of method and system that offsets test signal, described system offsets device by adding test signal, the test signal component that comprises in the digital signal of cancellation receiver output, the influence of having avoided the test signal component that the follow-up business signal is brought.On specific implementation, test signal offsets the position of device in described system and can adjust, offset the difference of setting position according to test signal, concrete receiver implementation also has very big difference, and detailed implementation will describe in subsequent embodiment.
As shown in Figure 3, a kind of system block diagram that offsets test signal for the embodiment of the invention provides comprises coupler 301, analog receiver 302, analog to digital converter 303, digital receiver 304, test signal generator 307, channel correcting device 305, comprise that also test signal offsets device 306, wherein
The analog test signal that coupler 301 acceptance test signal generators 307 send, described analog test signal is injected analog input signal, pass through analog receiver 302 after the analog input signal hybrid analog-digital simulation test signal, analog to digital converter 303, digital receiver 304, and then obtain corresponding digital signal, carry the digital test signal that analog test signal produces through above-mentioned passage in the described digital signal;
Test signal offsets device 306, and the digital test signal that acceptance test signal generator 307 sends is eliminated the digital test signal component that comprises in the digital signal of channel correcting device 305 outputs.
Concrete, as shown in Figure 4, for test signal offsets the block diagram of device 306, test signal offsets device 306 and comprises equalizer 401, subtracter 402 and feedback branch 403.A is that test signal offsets device 306 first input ends, and input signal is the digital signal that contains the test signal component of channel correcting device 305 outputs, and first input end provides input signal to equalizer 401 and the subtracter 402 that test signal offsets in the device 306; C is that test signal offsets device 306 second inputs, and input signal is the digital test signal that test signal generator 307 produces, and this digital test signal is the digital form of the analog test signal correspondence of input coupler 301; B is the output that test signal offsets device 306, and the digital signal of described output output is the digital output signal that offsets behind the test signal component.
The equalizer 401 that test signal offsets in the device 306 receives digital signal, the digital test signal of second input transmission and the digital output signal that test signal offsets the output of device 306 outputs that first input end sends, and described digital output signal feeds back to equalizer 401 via feedback branch 403.Equalizer 401 is an adaptive equalizer, can realize in time domain or frequency domain, can realize that the width of cloth of complexity is adjusted mutually, thereby offset the digital test signal component in the digital signal.When described adaptive equalization is time domain equalization, described digital test signal is carried out equilibrium by adopting FIR (Finite Impulse Response, finite impulse response (FIR)) or IIR (Infinite Impulse Response, infinite impulse response) filtering; When described adaptive equalization is frequency domain equalization, by adopting FFT (FastFourier Transform, fast fourier transform), frequency domain width of cloth phase weighting, IFFT (Inverse FastFourier Transform, invert fast fourier transformation) carry out equilibrium to described digital test signal.No matter be at time domain or frequency domain, equalizer can use LMS algorithm (Least Mean Square, lowest mean square), the adaptive algorithm of LS algorithm (least squares, least square), RLS algorithm (Recursive leastsquares, recurrence least square) or other standards.
The digital test signal of C end input is done balanced through equalizer 401, digital test signal after the equilibrium sends to subtracter 402, eliminate the digital test signal component in the digital signal, under the perfect condition, the test signal component will be offset fully, the digital output signal of subtracter 402 outputs output does not contain any test signal component, has avoided the influence of test signal component to follow-up business.
When receiver was multi-carrier receiver, here, the meaning of multi-carrier receiver was to hold a plurality of radio-frequency carriers on the receive path, rather than referred to that multi-carrier modulation is the OFDM modulation.4 carrier receivers that for example hold the WCDMA carrier wave of 4 5MHz bandwidth in the 20MHz bandwidth, test signal offset and can realize on each carrier wave.As shown in Figure 5, the another kind that provides for the embodiment of the invention offsets the system block diagram of test signal.The digital signal of digital receiver 504 outputs comprises n road carrier wave, the digital signal after described digital signal is proofreaied and correct through channel correcting device 505 generation n roads, and the digital signal input test signal after proofread and correct on described n road offsets device 506.As shown in Figure 6, offset device 506 block diagrams for test signal under the multicarrier state.At this moment, test signal offsets device 506 and comprises the n road and offset submodule 601 and multicarrier shunt module 602, and described n road offsets 601 pairs of every way word signals of submodule and carries out test signal respectively and offset operation.The digital test signal of C end input obtains n way word test signal through multicarrier shunt module 602, described n way word test signal is injected the n road respectively and is offseted submodule, the digital signal that every road is comprised after the correction of test signal component offsets, concrete every road carrier wave to offset principle identical with the described principle of Fig. 4.
The embodiment of the invention offsets device 506 by adding test signal in channel correcting device 505 backs, and the digital signal that comprises the test signal component that the digital test signal that utilizes test signal generator 507 to produce is exported channel correcting device 505 offsets.No matter be under the situation of single carrier or multicarrier, can eliminate of the influence of test signal component effectively to follow-up business.
As shown in Figure 7, the another kind that the embodiment of the invention provides offsets the system block diagram of test signal, described system comprises coupler 701, analog receiver 702, analog to digital converter 703, digital receiver 704, test signal generator 707, test signal offsets device 705, coefficient transducer 708, channel correcting device 707.Different with the foregoing description is, after the digital receiver 704 output digital signals, earlier offseting device 705 through test signal carries out the test signal component and offsets, and then proofread and correct through the digital signal that channel correcting device 706 pairs of test signals offset device 705 outputs, coefficient transducer 708 offsets the equalizer coefficients in the coefficient calculations channel correcting device 706 of equalizer 401 in the device 705 according to test signal, concrete, equalizer in the channel correcting device 706 is the inverse filter that test signal offsets equalizer 401 in the device, time domain impulse responses after i.e. two equalizers series connection are dirac impulse functions, adopt this kind mode to offset the structure of equalizer in the device according to test signal and construct equalizer in the channel correcting device.
In the present embodiment, receiver also can be multi-carrier receiver, and as shown in Figure 8, the another kind that provides for the embodiment of the invention offsets the system block diagram of test signal.The digital signal of digital receiver 804 outputs comprises n road carrier wave, and n road carrier wave input test signal offsets device 805.N way word signal input channel adjuster 806 after the process test signal offsets.At this moment, test signal offsets that device 805 comprises multicarrier shunt module 602 and the n road offsets submodule 601, the digital test signal of C end input obtains n way word test signal through multicarrier shunt module 602, described n way word test signal is injected the n road respectively and is offseted submodule 601, the digital signal that every road is comprised after the correction of test signal component offsets, concrete every road carrier wave to offset principle identical with the described principle of Fig. 4.Digital signal to the channel correcting device 806 that test signal offsets after device 805 output n roads offset is proofreaied and correct, the equalizer of every road signal correspondence can be calculated according to the equalizer 401 that test signal offset correspondence in the device by coefficient transducer 808 in the channel correcting device 806, identical during the concrete computational methods merchandiser carrier wave of the every road of channel correcting device equalizer, do not repeat them here.
As shown in Figure 9, a kind of method that offsets test signal for the embodiment of the invention provides comprises:
Step 901: test signal offsets the digital test signal of device acceptance test signal generator transmission and the digital signal of channel correcting device output, and balanced described digital test signal comprises the test signal component in the digital signal of described channel correcting device output;
What need further specify is, described equilibrium can be adaptive equalization, and wherein, described adaptive equalization can be frequency domain or time domain equalization, when described adaptive equalization is time domain equalization, described digital test signal is carried out equilibrium by adopting FIR or IIR filtering; When described adaptive equalization is frequency domain equalization, described digital test signal is carried out equilibrium by adopting FFT, the weighting of frequency domain width of cloth phase, IFFT.The adaptive algorithm that described adaptive equalization adopts comprises LMS, LS, RLS etc.
Step 902: test signal offsets device the digital signal of described channel correcting device output and the described digital test signal after the equilibrium is offseted, and eliminates the described test signal component that comprises in the described digital signal.
As shown in figure 10, the another kind that provides for the embodiment of the invention offsets the method for test signal, comprising:
Step 1001: test signal offsets the digital test signal of device acceptance test signal generator transmission and the digital signal of digital receiver output, and balanced described digital test signal comprises the test signal component in the digital signal of described digital receiver output;
Described equilibrium can be adaptive equalization, and wherein, described adaptive equalization can be frequency domain or time domain equalization, when described adaptive equalization is time domain equalization, by adopting FIR or IIR filtering described digital test signal is carried out equilibrium; When described adaptive equalization is frequency domain equalization, described digital test signal is carried out equilibrium by adopting FFT, the weighting of frequency domain width of cloth phase, IFFT.The adaptive algorithm that described adaptive equalization adopts comprises LMS, LS, RLS etc.
Step 1002: test signal offsets device the digital signal of described digital receiver output and the described digital test signal after the equilibrium is offseted, and eliminates the described test signal component that comprises in the described digital signal;
After test signal offsets device and eliminates the test signal that comprises in the digital signal of described digital receiver output, also comprise:
Step 1003: test signal offsets digital signal after the offseting that device will export and sends to the channel correcting device and proofread and correct.
The embodiment of the invention provides a kind of method and system that offsets test signal, offsets the test signal that comprises in the digital signal of module to output by test signal and offsets, and has avoided the influence of test signal component to follow-up business.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (13)
1, a kind of system that offsets test signal comprises coupler, analog receiver, and analog to digital converter, digital receiver, the test signal generator, the channel correcting device is characterized in that, comprises that also test signal offsets device, wherein,
Described test signal generator is used to produce analog test signal and the digital test signal corresponding with described analog test signal, and described analog test signal is sent to described coupler, described digital test signal is sent to described test signal offset device;
Described coupler, the described analog test signal that is used for receiving injects analog input signal;
Described analog receiver, the described analog input signal that is used for having mixed described analog test signal sends to described analog to digital converter;
Described analog to digital converter is used for converting the described described analog input signal that has mixed described analog test signal to digital signal, comprises the test signal component in the described digital signal;
Described digital receiver is used to receive described digital signal, and described digital signal is sent to the channel correcting device;
Described channel correcting device is used to receive the digital signal that described digital receiver sends, and described digital signal is proofreaied and correct;
Described test signal offsets device, is used to receive the digital signal of described channel correcting device output and the digital test signal that described test signal generator sends, and eliminates the test signal component that comprises in the digital signal of described channel correcting device output.
2, the system as claimed in claim 1 is characterized in that, described test signal offsets device and comprises:
Equalizer is used to receive digital test signal that the digital signal of described channel correcting device output, described test signal generator send and offsets the digital signal of the output feedback of device, balanced described digital test signal and output from described test signal;
Subtracter is used to receive the digital test signal after the equilibrium of the digital signal of described channel correcting device output and the output of described equalizer, eliminates the test signal component that comprises in the digital signal of described channel correcting device output.
3, system as claimed in claim 2 is characterized in that, described equalizer is an adaptive equalizer.
4, system as claimed in claim 2, when described analog receiver and described digital receiver are multi-carrier receiver, described channel correcting device output n road comprises the digital signal of test signal component, it is characterized in that described test signal offsets device and also comprises:
The multicarrier shunt module, be used for the n road that described digital test signal is divided into the output of n road and described channel correcting device comprise the test signal component the digital signal correspondence digital test signal and export to described equalizer;
Described n is the integer more than or equal to 2.
5, a kind of system that offsets test signal comprises coupler, analog receiver, and analog to digital converter, digital receiver, the test signal generator, the channel correcting device is characterized in that, comprises that also test signal offsets device, wherein,
Described test signal generator is used to produce analog test signal and the digital test signal corresponding with described analog test signal, and described analog test signal is sent to described coupler, described digital signal is sent to described test signal offset device;
Described coupler, the described analog test signal that is used for receiving injects analog input signal;
Described analog receiver, the described analog input signal that is used for having mixed described analog test signal sends to described analog to digital converter;
Described analog to digital converter is used for converting the described described analog input signal that has mixed described analog test signal to digital signal, comprises the test signal component in the described digital signal;
Described digital receiver is used to receive described digital signal, described digital signal is sent to described test signal offset device;
Described test signal offsets device, is used to receive the digital signal of described digital receiver transmission and the described digital test signal that described test signal generator sends, and eliminates the test signal component that comprises in the digital signal of described digital receiver output;
Described channel correcting device is used to receive the digital signal that described test signal offsets device output, and described digital signal is proofreaied and correct.
6, system as claimed in claim 5 is characterized in that, described test signal offsets device and comprises:
Equalizer, be used to receive digital signal that described digital receiver sends, digital test signal that described test signal generator sends and offset the digital output signal of the output feedback of device, described digital test signal that balanced described test signal generator produces and output from described test signal;
Subtracter is used to receive the digital test signal after the equilibrium of the digital signal of described digital receiver output and the output of described equalizer, eliminates the test signal component that comprises in the digital signal of described digital receiver output.
7, system as claimed in claim 6 is characterized in that, described equalizer is an adaptive equalizer.
8, system as claimed in claim 5 is characterized in that, described system also comprises the coefficient transducer, wherein,
The coefficient transducer is used for calculating according to the parametric equalizer that described test signal offsets device the parameter of the equalizer in the channel correcting device;
Correspondingly, described channel correcting device is used for the equalizer in the described channel correcting device of parametric configuration of equalizer of the described channel correcting device that sends according to described coefficient transducer, and the digital signal that test signal is offseted device output is proofreaied and correct.
9, system as claimed in claim 6, when described analog receiver and described digital receiver are multi-carrier receiver, described digital receiver output n road comprises the digital signal of test signal component, it is characterized in that described test signal offsets device and also comprises:
The multicarrier shunt module, be used for the n road that described digital test signal is divided into the output of n road and described digital receiver comprise the test signal component the digital signal correspondence digital test signal and export to described equalizer;
Described n is the integer more than or equal to 2.
10, a kind of method that offsets test signal is characterized in that, comprising:
Test signal offsets the digital test signal of device acceptance test signal generator transmission and the digital signal of channel correcting device output, and balanced described digital test signal wherein, comprises the test signal component in the digital signal of described channel correcting device output;
Test signal offsets device the digital signal of described channel correcting device output and the described digital test signal after the equilibrium is offseted, and eliminates the described test signal component that comprises in the described digital signal.
11, method as claimed in claim 10 is characterized in that, described equilibrium is an adaptive equalization, wherein,
When described adaptive equalization is time domain equalization, described digital test signal is carried out equilibrium by adopting finite pulse response FIR or infinite impulse response IIR filtering; Or,
When described adaptive equalization is frequency domain equalization, described digital test signal is carried out equilibrium by adopting fast fourier transform FFT, the weighting of frequency domain width of cloth phase, invert fast fourier transformation IFFT.
12, a kind of method that offsets test signal is characterized in that, comprising:
Test signal offsets the digital test signal of device acceptance test signal generator transmission and the digital signal of digital receiver output, and balanced described digital test signal wherein, comprises the test signal component in the digital signal of described digital receiver output;
Test signal offsets device the digital signal of described digital receiver output and the described digital test signal after the equilibrium is offseted, and eliminates the described test signal component that comprises in the described digital signal.
13, method as claimed in claim 12 is characterized in that, described equilibrium is an adaptive equalization, wherein,
When described adaptive equalization is time domain equalization, described digital test signal is carried out equilibrium by adopting finite pulse response FIR or infinite impulse response IIR filtering; Or,
When described adaptive equalization is frequency domain equalization, described digital test signal is carried out equilibrium by adopting fast fourier transform FFT, the weighting of frequency domain width of cloth phase, invert fast fourier transformation IFFT.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104838593A (en) * | 2013-12-06 | 2015-08-12 | 华为技术有限公司 | Signal conversion method and apparatus |
| CN107037489A (en) * | 2017-06-21 | 2017-08-11 | 电子科技大学 | A kind of automatic compensation device of induction logging directly coupling signal |
| CN107037490A (en) * | 2017-06-21 | 2017-08-11 | 电子科技大学 | A kind of induction logging directly coupling signal offsets method automatically |
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| US5119196A (en) * | 1990-06-25 | 1992-06-02 | At&T Bell Laboratories | Ghost cancellation of analog tv signals |
| AU682700B2 (en) * | 1993-06-21 | 1997-10-16 | Kabushiki Kaisha Toshiba | Digital radio communication equipment |
| US5612974A (en) * | 1994-11-01 | 1997-03-18 | Motorola Inc. | Convolutional encoder for use on an integrated circuit that performs multiple communication tasks |
| JP3325735B2 (en) * | 1995-01-31 | 2002-09-17 | 松下電器産業株式会社 | Data receiving device |
| CN100337485C (en) * | 2003-07-17 | 2007-09-12 | 华为技术有限公司 | An adjusting apparatus and method for send-receive channel of wireless communication system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104838593A (en) * | 2013-12-06 | 2015-08-12 | 华为技术有限公司 | Signal conversion method and apparatus |
| CN107037489A (en) * | 2017-06-21 | 2017-08-11 | 电子科技大学 | A kind of automatic compensation device of induction logging directly coupling signal |
| CN107037490A (en) * | 2017-06-21 | 2017-08-11 | 电子科技大学 | A kind of induction logging directly coupling signal offsets method automatically |
| CN107037489B (en) * | 2017-06-21 | 2018-12-18 | 电子科技大学 | A kind of automatic compensation device of induction logging directly coupling signal |
| CN107037490B (en) * | 2017-06-21 | 2018-12-18 | 电子科技大学 | A kind of induction logging directly coupling signal offsets method automatically |
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