CN101436876B - Method and system for cancellation of test signal - Google Patents
Method and system for cancellation of test signal Download PDFInfo
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- CN101436876B CN101436876B CN2008102176879A CN200810217687A CN101436876B CN 101436876 B CN101436876 B CN 101436876B CN 2008102176879 A CN2008102176879 A CN 2008102176879A CN 200810217687 A CN200810217687 A CN 200810217687A CN 101436876 B CN101436876 B CN 101436876B
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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 of cancellation of test signal.
Background technology
The receiver block diagram as shown in Figure 1 in the wireless communication system, the radiofrequency signal of antenna reception, 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, then after digital receiver carries out digital filtering, extract to process digital signal, 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, the digital form input channel correction module that analog test signal is corresponding calculates the non-ideal characteristic of passage, and 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 certain forms, 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 still contain the test signal component in the digital signal of output after receiver is proofreaied and correct, 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 of cancellation of test signal, has eliminated the test signal component that comprises in the digital signal of receiver output, the impact 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 of cancellation of test signal, comprises coupler, analog receiver, and analog to digital converter, digital receiver, the test signal generator, the channel correcting device also comprises the test signal compensation device, wherein,
Described test signal generator for generation of analog test signal and the digital test signal corresponding with described analog test signal, sends to described coupler with described analog test signal, and described digital test signal is sent to described test signal compensation device;
Described coupler, the described analog test signal that is used for receiving injects analog input signal;
Described analog receiver sends to described analog to digital converter for the described analog input signal that will mix described analog test signal;
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 for receiving described digital signal, and described digital signal is sent to the channel correcting device;
Described channel correcting device is used for receiving the digital signal that described digital receiver sends, and described digital signal is proofreaied and correct;
Described test signal compensation device, be used for receiving the digital signal of described channel correcting device output and the digital test signal that described test signal generator sends, eliminate the test signal component that comprises in the digital signal of described channel correcting device output, described test signal compensation device comprises:
Equalizer is used for receiving digital test signal that the digital signal of described channel correcting device output, described test signal generator send and from the digital signal of the output feedback of described test signal compensation device, balanced described digital test signal and output;
Subtracter for the digital test signal after the equilibrium of the digital signal that receives described channel correcting device output and the output of described equalizer, is eliminated 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 of cancellation of test signal, comprises coupler, analog receiver, and analog to digital converter, digital receiver, the test signal generator, the channel correcting device also comprises the test signal compensation device, wherein,
Described test signal generator for generation of analog test signal and the digital test signal corresponding with described analog test signal, sends to described coupler with described analog test signal, and described digital signal is sent to described test signal compensation device;
Described coupler, the described analog test signal that is used for receiving injects analog input signal;
Described analog receiver sends to described analog to digital converter for the described analog input signal that will mix described analog test signal;
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 for receiving described digital signal, and described digital signal is sent to described test signal compensation device;
Described test signal compensation device, be used for receiving the digital signal of described digital receiver transmission and the described digital test signal that described test signal generator sends, eliminate the test signal component that comprises in the digital signal of described digital receiver output, described test signal compensation device comprises:
Equalizer, be used for receiving digital signal that described digital receiver sends, digital test signal that described test signal generator sends and from the digital output signal of the output feedback of described test signal compensation device, the described digital test signal that balanced described test signal generator produces and output;
Subtracter for the digital test signal after the equilibrium of the digital signal that receives described digital receiver output and the output of described equalizer, is eliminated the test signal component that comprises in the digital signal of described digital receiver output;
Described channel correcting device is used for receiving the digital signal that described test signal compensation device is exported, and described digital signal is proofreaied and correct.
The embodiment of the invention is by adding the test signal compensation device, the test signal component that comprises in the digital signal of cancellation receiver output, the impact of having avoided the test signal component that the follow-up business signal is brought.
Description of drawings
Fig. 1 is 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 the system block diagram of a kind of cancellation of test signal of providing of the embodiment of the invention;
Fig. 4 is the block diagram of a kind of test signal compensation device of providing of the embodiment of the invention;
Fig. 5 is the system block diagram of the another kind of cancellation of test signal that provides of the embodiment of the invention;
Fig. 6 is a kind of test signal compensation device block diagram under the multicarrier state that provides of the embodiment of the invention;
Fig. 7 is the system block diagram of the another kind of cancellation of test signal that provides of the embodiment of the invention;
Fig. 8 is the system block diagram of the another kind of cancellation of test signal that provides of the embodiment of the invention;
Fig. 9 is the method for a kind of cancellation of test signal of providing of the embodiment of the invention;
Figure 10 is the method for the another kind of cancellation of test signal that provides of the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of method and system of cancellation of test signal, described system is by adding the test signal compensation device, the test signal component that comprises in the digital signal of cancellation receiver output, the impact of having avoided the test signal component that the follow-up business signal is brought.On specific implementation, the position of test signal compensation device in described system can be adjusted, according to the difference of test signal compensation device position, concrete receiver implementation also has very big difference, and detailed implementation will describe in subsequent embodiment.
As shown in Figure 3, the system block diagram of a kind of cancellation of test signal that provides for the embodiment of the invention comprises coupler 301, analog receiver 302, analog to digital converter 303, digital receiver 304, test signal generator 307, channel correcting device 305, also comprise test signal compensation device 306, wherein
Test signal compensation device 306 receives the digital test signal that test signal generator 307 sends, and eliminates the digital test signal component that comprises in the digital signal of channel correcting device 305 outputs.
Concrete, as shown in Figure 4, being the block diagram of test signal compensation device 306, test signal compensation device 306 comprises equalizer 401, subtracter 402 and feedback branch 403.A is test signal compensation 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 in the test signal compensation device 306; C is test signal compensation device 306 second inputs, and input signal is the digital test signal that test signal generator 307 produces, and this digital test signal is digital form corresponding to the analog test signal of input coupler 301; B is the output of test signal compensation device 306, and the digital signal of described output output is the digital output signal behind the cancellation of test signal component.
Equalizer 401 in the test signal compensation device 306 receives digital signal, the digital test signal of the second input transmission and the digital output signal of test signal compensation device 306 outputs output that first input end sends, and described digital output signal feeds back to equalizer 401 via feedback branch 403.Equalizer 401 is 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, by adopting FIR (Finite Impulse Response, finite impulse response (FIR)) or IIR (Infinite Impulse Response, infinite impulse response) filtering described digital test signal is carried out equilibrium; When described adaptive equalization is frequency domain equalization, by adopting FFT (Fast Fourier Transform, fast fourier transform), frequency domain width of cloth phase weighting, IFFT (Inverse Fast Fourier 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), LS algorithm (least squares, least square), the adaptive algorithm of RLS algorithm (Recursive least squares, 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 impact of test signal component on 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 at each carrier wave.The system block diagram of the another kind of cancellation of test signal that provides for the embodiment of the invention as shown in Figure 5.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, the digital signal input test signal compensation device 506 after proofread and correct on described n road.As shown in Figure 6, be test signal compensation device 506 block diagrams under the multicarrier state.At this moment, test signal compensation device 506 comprises the n road and offsets submodule 601 and multicarrier shunt module 602, and described n road offsets 601 pairs of every railway digital signals of submodule and carries out respectively test signal and offset operation.The digital test signal of C end input obtains n railway digital test signal through multicarrier shunt module 602, described n railway digital test signal is injected respectively the n road 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 is passed through at channel correcting device 505 rear adding test signal compensation devices 506, 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 in the situation of single carrier or multicarrier, can effectively eliminate the test signal component to the impact of follow-up business.
As shown in Figure 7, the system block diagram of the another kind of cancellation of test signal that the embodiment of the invention provides, described system comprises coupler 701, analog receiver 702, analog to digital converter 703, digital receiver 704, test signal generator 707, test signal compensation device 705, coefficients conversion device 708, channel correcting device 707.Different from above-described embodiment is, behind digital receiver 704 output digit signals, carrying out the test signal component through test signal compensation device 705 first offsets, and then the digital signal of 706 pairs of test signal compensation devices of process channel correcting device, 705 outputs is proofreaied and correct, coefficients conversion device 708 is according to the equalizer coefficients in the coefficient calculations channel correcting device 706 of equalizer 401 in the test signal compensation device 705, concrete, equalizer in the channel correcting device 706 is the inverse filter of equalizer 401 in the test signal compensation device, time domain impulse responses after i.e. two equalizers series connection are dirac impulse functions, adopt this kind mode to construct equalizer in the channel correcting device according to the structure of equalizer in the test signal compensation device.
In the present embodiment, receiver also can be multi-carrier receiver, as shown in Figure 8, and the system block diagram of the another kind of cancellation of test signal that provides for the embodiment of the invention.The digital signal of digital receiver 804 outputs comprises n road carrier wave, n road carrier wave input test signal compensation device 805.N railway digital signal input channel adjuster 806 after the process test signal offsets.At this moment, test signal compensation device 805 comprises multicarrier shunt module 602 and the n road offsets submodule 601, the digital test signal of C end input obtains n railway digital test signal through multicarrier shunt module 602, described n railway digital test signal is injected respectively the n road 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 channel correcting device 806 after test signal compensation device 805 output n roads offset is proofreaied and correct, the equalizer that every road signal is corresponding in the channel correcting device 806 can be calculated according to equalizer 401 corresponding in the test signal compensation device by coefficients conversion device 808, 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, the method for a kind of cancellation of test signal that provides for the embodiment of the invention comprises:
Step 901: the test signal compensation device receives the digital test signal of 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 to 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, by adopting FIR or IIR filtering described digital test signal is carried out equilibrium; When described adaptive equalization is frequency domain equalization, by adopting FFT, the weighting of frequency domain width of cloth phase, IFFT described digital test signal is carried out equilibrium.The adaptive algorithm that described adaptive equalization adopts comprises LMS, LS, RLS etc.
Step 902: the test signal compensation device offsets the digital signal of described channel correcting device output and the described digital test signal after the equilibrium, eliminates the described test signal component that comprises in the described digital signal.
As shown in figure 10, the method for the another kind of cancellation of test signal that provides for the embodiment of the invention comprises:
Step 1001: the test signal compensation device receives the digital test signal of 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, by adopting FFT, the weighting of frequency domain width of cloth phase, IFFT described digital test signal is carried out equilibrium.The adaptive algorithm that described adaptive equalization adopts comprises LMS, LS, RLS etc.
Step 1002: the test signal compensation device offsets the digital signal of described digital receiver output and the described digital test signal after the equilibrium, eliminates the described test signal component that comprises in the described digital signal;
After the test signal compensation device is eliminated the test signal that comprises in the digital signal of described digital receiver output, also comprise:
Step 1003: the digital signal that the test signal compensation device will be exported after offseting sends to the channel correcting device and proofreaies and correct.
The embodiment of the invention provides a kind of method and system of cancellation of 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 impact of test signal component on follow-up business.
The above only is 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 (7)
1. the system of a cancellation of 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, also comprises the test signal compensation device, wherein,
Described test signal generator for generation of analog test signal and the digital test signal corresponding with described analog test signal, sends to described coupler with described analog test signal, and described digital test signal is sent to described test signal compensation device;
Described coupler, the described analog test signal that is used for receiving injects analog input signal;
Described analog receiver sends to described analog to digital converter for the described analog input signal that will mix described analog test signal;
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 for receiving described digital signal, and described digital signal is sent to the channel correcting device;
Described channel correcting device is used for receiving the digital signal that described digital receiver sends, and described digital signal is proofreaied and correct;
Described test signal compensation device, be used for receiving the digital signal of described channel correcting device output and the digital test signal that described test signal generator sends, eliminate the test signal component that comprises in the digital signal of described channel correcting device output, described test signal compensation device comprises:
Equalizer is used for receiving digital test signal that the digital signal of described channel correcting device output, described test signal generator send and from the digital signal of the output feedback of described test signal compensation device, balanced described digital test signal and output;
Subtracter for the digital test signal after the equilibrium of the digital signal that receives described channel correcting device output and the output of described equalizer, is eliminated 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 equalizer is adaptive equalizer.
3. the system as claimed in claim 1, 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 compensation device also comprises:
The multicarrier shunt module is used for the n road that described digital test signal is divided into n road and the output of described channel correcting device is comprised digital test signal corresponding to the digital signal of test signal component and exports to described equalizer;
Described n is the integer more than or equal to 2.
4. the system of a cancellation of 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, also comprises the test signal compensation device, wherein,
Described test signal generator for generation of analog test signal and the digital test signal corresponding with described analog test signal, sends to described coupler with described analog test signal, and described digital signal is sent to described test signal compensation device;
Described coupler, the described analog test signal that is used for receiving injects analog input signal;
Described analog receiver sends to described analog to digital converter for the described analog input signal that will mix described analog test signal;
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 for receiving described digital signal, and described digital signal is sent to described test signal compensation device;
Described test signal compensation device, be used for receiving the digital signal of described digital receiver transmission and the described digital test signal that described test signal generator sends, eliminate the test signal component that comprises in the digital signal of described digital receiver output, described test signal compensation device comprises:
Equalizer, be used for receiving digital signal that described digital receiver sends, digital test signal that described test signal generator sends and from the digital output signal of the output feedback of described test signal compensation device, the described digital test signal that balanced described test signal generator produces and output;
Subtracter for the digital test signal after the equilibrium of the digital signal that receives described digital receiver output and the output of described equalizer, is eliminated the test signal component that comprises in the digital signal of described digital receiver output;
Described channel correcting device is used for receiving the digital signal that described test signal compensation device is exported, and described digital signal is proofreaied and correct.
5. system as claimed in claim 4 is characterized in that, described equalizer is adaptive equalizer.
6. system as claimed in claim 4 is characterized in that, described system also comprises the coefficients conversion device, wherein,
The coefficients conversion device is used for the parameter according to the equalizer in the parametric equalizer calculating channel correcting device of described test signal compensation 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 coefficients conversion device, and the digital signal of test signal compensation device output is proofreaied and correct.
7. system as claimed in claim 4, 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 compensation device also comprises:
The multicarrier shunt module is used for the n road that described digital test signal is divided into n road and the output of described digital receiver is comprised digital test signal corresponding to the digital signal of test signal component and exports to described equalizer;
Described n is the integer more than or equal to 2.
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| WO2015081573A1 (en) * | 2013-12-06 | 2015-06-11 | 华为技术有限公司 | Signal conversion method and apparatus |
| 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 |
| 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 |
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| US5119196A (en) * | 1990-06-25 | 1992-06-02 | At&T Bell Laboratories | Ghost cancellation of analog tv signals |
| CN1125500A (en) * | 1993-06-21 | 1996-06-26 | 株式会社东芝 | 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 |
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