CN101286757A - Anti-jamming method and device in phase tracing - Google Patents
Anti-jamming method and device in phase tracing Download PDFInfo
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- CN101286757A CN101286757A CNA2008100606073A CN200810060607A CN101286757A CN 101286757 A CN101286757 A CN 101286757A CN A2008100606073 A CNA2008100606073 A CN A2008100606073A CN 200810060607 A CN200810060607 A CN 200810060607A CN 101286757 A CN101286757 A CN 101286757A
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Abstract
The invention relates to an anti-interference method for the phase tracking of a digital signal receiver and a device thereof. The traditional phase tracking method can result in decision error when a narrow band interference signal is overlapped in a signal channel band. The method of the invention is that a pseudorandom sequence Ri generated by a receiver is taken as a rotation control variable; symbol scrambling is imposed on a current constellation according to the pseudorandom sequence Ri; phase identification is carried out to the constellation after the symbol scrambling and loop filtering is carried out to the output of the phase identification; the control variable after the loop filtering is used for controlling the phase shift degree and compensating the phase of the constellation. The device of the invention comprises a phase shifter, a phase identifier, a loop filter, a pseudorandom sequence generator and a symbol scrambler. The anti-interference method of the invention achieves the aim of anti-interference by the symbol scrambling to eliminate the relativity of the narrow band interference going into the band with strong time relativity. The method enhances the stability of a phase tracking loop and ensures the receiving performance of a digital receiving system.
Description
Technical field
The invention belongs to field of digital signals, specifically belong to the Phase Tracking field of digital signal, particularly a kind of anti-interference method of Phase Tracking, and realize the employed device of this method.
Background technology
Digital signal receiver need carry out carrier frequency recovery and Phase Tracking to the digital signal after the analog-to-digital conversion, has stable phase place with the constellation that guarantees signal, then the constellation with stable phase angle is further adjudicated.
Traditional frequency retrieval and Phase Tracking device are as shown in Figure 1, this device comprises that timing recovers module 10, carrier frequency recovery module 11, Phase Tracking module 12 and judging module 13, and the digital signal after the analog-to-digital conversion recovers module 10 by timing and carrier frequency recovery module 11 enters Phase Tracking module 12.Phase Tracking module 12 is used for control automatically and adjusts output signal and definite relation of phase of input signals maintenance, is made up of phase shifter 121, phase discriminator 122 and loop filter 123.Wherein, phase discriminator 122 is used for the input signal of differential phase tracking module 12 and the phase difference between the output signal, and output error is to loop filter 123; Loop filter 123 is used for the noise that filtering is mingled in output error, and provides required controlled quentity controlled variable to phase shifter 121, so as to changing the phase place of phase shifter 121 output constellations; Phase shifter 121 is according to the controlled quentity controlled variable of phase discriminator 122 and loop filter 123 outputs, the specific angle of input signal rotation with Phase Tracking module 12, be used for offsetting from the remaining phase deviation of the signal of carrier frequency recovery module, thereby adjust the phase relation of the transmission signal of signal and modulated terminal automatically.
But, behind the narrow-band interference signal that superposeed in the channel strip, the strong temporal correlation of narrow band signal can produce harmful effect to phase discriminator 122 and loop filter 123, causes the output of Phase Tracking module 12 to turn 90 degrees partially clockwise or counterclockwise suddenly, promptly causes the loop cycle-skipping.The loop cycle-skipping will cause judging module 13 to occur a large amount of mistakes at short notice, thereby influence the performance of receiver.
Summary of the invention
The objective of the invention is provides a kind of anti-interference method of Phase Tracking at deficiency of the prior art.The present invention also provides a kind of means for anti-jamming of Phase Tracking.Remove the correlation of infiltrating the narrow band interference in the band by the symbol scrambling, reach jamproof purpose with strong temporal correlation.
The anti-interference method of Phase Tracking comprises the steps:
S1. by the local pseudo random sequence Ri that produces of receiver as the Spin Control amount, this pseudo random sequence Ri decision applies the amount of the anglec of rotation on complex plane to the constellation of the output of current phase shifter;
S2. according to pseudo random sequence Ri current constellation is carried out the symbol scrambling on complex plane:
At first pseudo random sequence Ri is mapped as angle to be rotated, getting Ri is any one binary number, and angle then to be rotated is
Wherein coefficient k is more than or equal to 0 smaller or equal to 3 arbitrary integer, and Ri and coefficient k are for corresponding one by one;
Then current constellation is carried out
The phase place rotation of angle, promptly obtaining according to pseudo random sequence Ri is that the center has rotated to current constellation with the complex plane initial point
Constellation after the angle;
S3. the constellation after the symbol scrambling is carried out phase demodulation, to phase demodulation output carrying out loop filtering;
S4. with the number of degrees of the controlled quentity controlled variable behind the loop filtering, phase constellation is compensated as the control phase shift.
Among the step S3, the constellation after the symbol scrambling is carried out phase demodulation, loop filtering is carried out in phase demodulation output, and among the step S4, controlled quentity controlled variable is as the number of degrees of control phase shift, and is identical with step and implementation method corresponding in traditional frequency retrieval and the Phase Tracking method.
Realize the means for anti-jamming of the employed Phase Tracking of above anti-interference method.
The means for anti-jamming of Phase Tracking comprises phase shifter, phase discriminator, loop filter, pseudo-random sequence generator and symbol scrambler.
Wherein, the output of phase shifter and pseudo-random sequence generator is connected with the input of symbol scrambler respectively, the output of symbol scrambler is connected with the input of phase discriminator, and the output of phase discriminator is connected with the loop filter input, and the output of loop filter is connected with the input of phase shifter; The input of described phase shifter is connected with the output of the carrier frequency recovery module of external system, and the output of the phase shifter of jamproof Phase Tracking device is connected with the input of the judging module of external system.
The pseudo-random sequence generator of the means for anti-jamming of Phase Tracking is used to produce pseudo random sequence Ri as the Spin Control amount, pseudo random sequence Ri is used to determine the constellation to the output of current phase shifter to apply the rotation of how many angles again on complex plane, can adopt existing mature technology to realize.
The symbol scrambler of the means for anti-jamming of Phase Tracking is used for according to pseudo random sequence Ri current constellation being carried out the symbol scrambling on complex plane.
Wherein, described symbol scrambler comprises mapper and multiplier; The input of mapper links to each other with the output of pseudo-random sequence generator, and the output of mapper links to each other with the two-way input of multiplier respectively with the output of phase shifter, and the output of multiplier links to each other with the input of phase discriminator.
Wherein, the mapper of symbol scrambler is mapped as angle to be rotated with pseudo random sequence Ri, and getting Ri is any one binary number, and angle then to be rotated is
Wherein, coefficient k is more than or equal to 0 smaller or equal to 3 arbitrary integer, and Ri and coefficient k are for corresponding one by one.
Wherein, the multiplier of symbol scrambler carries out described to current constellation
The phase place rotation of angle is that center rotated to current constellation with the complex plane initial point according to pseudo random sequence Ri promptly
Constellation after the angle.
Constellation after the symbol scrambling is through the filtering of loop filter, the reflection that its output is stable send into the residual phase skew of phase shifter, by the control phase shifter can be stable the phase deviation compensation with remnants.
The phase shifter of the means for anti-jamming of Phase Tracking, phase discriminator, loop filter all adopt the technology that has Phase Tracking module correspondence in traditional frequency retrieval and the Phase Tracking device now to realize.
Method and apparatus of the present invention is applicable to QAM, and MPSK and APSK etc. adopt the digital communication system of quadrature modulation.
The invention has the beneficial effects as follows: have interference in the good resistance band, suitably choose pseudo-random sequence generator, the temporal correlation of the narrow band interference of stack in the band can be removed, thereby strengthen the stability of phase tracking loop, reduce loop cycle-skipping probability greatly, guarantee the receptivity of digital received system in adverse circumstances.
Description of drawings
Fig. 1 is traditional frequency retrieval and Phase Tracking schematic representation of apparatus;
Fig. 2 is the schematic diagram of the means for anti-jamming of the Phase Tracking of employing the inventive method;
Fig. 3 is the schematic diagram of the symbol scrambler in the device of the present invention.
Embodiment
Below in conjunction with accompanying drawing, method and apparatus of the present invention is specifically described.
Fig. 2 is the schematic diagram of the means for anti-jamming of the Phase Tracking of employing method of the present invention.The means for anti-jamming 22 of the Phase Tracking among Fig. 2 is used for definite relation that the automatic phase place of controlling and adjust the transmission signal of output signal and modulated terminal keeps.Comprise phase shifter 221, symbol scrambler 222, pseudo-random sequence generator 223, phase discriminator 224 and loop filter 225.
The output of phase shifter 221 and pseudo-random sequence generator 223 links to each other with the input of symbol scrambler 222 respectively among Fig. 2, the output of symbol scrambler 222 links to each other with the input of phase discriminator 224, the output of phase discriminator 224 links to each other with loop filter 225 inputs, and the output of loop filter 225 links to each other with the input of phase shifter 221.
The input of the phase shifter 221 of the means for anti-jamming 22 of Phase Tracking links to each other with the output of carrier frequency recovery module 11 in the system shown in Figure 1 among Fig. 2, the output of the phase shifter 221 of the means for anti-jamming 22 of Phase Tracking links to each other with the input of judging module 13 in the system shown in Figure 1
The operation principle of system is: in the external system as shown in Figure 1, at first send into through the sampled data of analog-to-digital conversion input system and regularly to recover module 10 and carry out timing resampling, send into carrier frequency recovery module 11 through the data after regularly and remove frequency deviation, it only is a phase place rotation that the planisphere that recovers the data sent and ideal position from carrier wave is compared what differ.These data are sent to the means for anti-jamming 22 of Phase Tracking shown in Figure 2 then,
Acting as of phase shifter 221 rotated specific angle with input signal among Fig. 2, and this angle is used for offsetting from the remaining phase deviation of the signal of carrier frequency recovery module by phase discriminator 224 and loop filter 225 decisions; Pseudo-random sequence generator 223 produces pseudo random sequence Ri; Symbol scrambler 222 carries out the rotation of fixed angle to the output of phase shifter 221 according to pseudo random sequence Ri.
The 2bit pseudo random sequence Ri that pseudo-random sequence generator 223 produces is as the Spin Control amount, is used to determine the constellation to the output of current phase shifter to apply the rotation of how many angles again on complex plane, can adopt existing mature technology to realize.
The mapper 31 of symbol scrambler 222 is mapped as angle to be rotated with pseudo random sequence Ri, and getting Ri is any one binary number, and angle then to be rotated is
Wherein coefficient k is more than or equal to 0 smaller or equal to 3 arbitrary integer, and Ri and coefficient k are relation one to one;
When setting any one among the Ri=00,01,10,11, angle then to be rotated is 0,
π,
In any one, a kind of implementation of mapper 31 is
A kind of concrete mapping mode is:
Ri=00, k=0 treats the anglec of rotation 0, mapper output 0
Ri=01, k=1 treats that the anglec of rotation is clockwise
Mapper output
Ri=10, k=2 treats the clockwise π of the anglec of rotation, mapper output e
π j
Ri=11, k=3 treats that the anglec of rotation is clockwise
Mapper output
The multiplier 32 of symbol scrambler 222 multiplies each other the output valve of mapper and the constellation of current phase shifter output, is that center rotated to current constellation signal with the complex plane initial point according to pseudo random sequence Ri promptly
Constellation after the symbol scrambling of angle.
Constellation after the symbol scrambling is through the filtering of loop filter 225, the reflection that its output is stable send into the residual phase skew of phase shifter 221, by control phase shifter 221 can be stable the phase deviation compensation with remnants.
The anti-interference method of Phase Tracking of the present invention comprises the steps:
S11. by the local pseudo random sequence Ri that produces of receiver as the Spin Control amount, this pseudo random sequence Ri is used to determine the constellation to the output of current phase shifter to apply the rotation of how many angles again on complex plane;
S12. according to pseudo random sequence Ri current constellation is carried out the symbol scrambling on complex plane:
At first pseudo random sequence Ri is mapped as angle to be rotated, gets the binary number of Ri for any one 2bit, angle then to be rotated is
K is the arbitrary integer more than or equal to 0, wherein Ri with
For concerning one to one;
Then current constellation is carried out
The rotation of the phase place of angle obtains current constellation and angle the to be rotated constellation after real part on the complex plane and imaginary part are superimposed respectively, is that the center has rotated according to pseudo random sequence Ri signal with the complex plane initial point promptly
The symbol scrambling after constellation;
S13. the constellation after the symbol scrambling is carried out phase demodulation, to phase demodulation output carrying out loop filtering;
S14. the controlled quentity controlled variable behind the loop filtering is used to control the number of degrees of phase shift, phase constellation is compensated.
A kind of embodiment of step S12 is: getting Ri is the 2bit binary number, when setting any one among the Ri=00,01,10,11, to the number of degrees that turn clockwise that the constellation after the current phase compensation applies again can be for 0,
π,
In any one;
Among the step S13, the constellation after the symbol scrambling is carried out phase demodulation, loop filtering is carried out in phase demodulation output, and among the step S14, controlled quentity controlled variable is used to control the number of degrees of phase shift, identical with step and implementation method corresponding in traditional frequency retrieval and the Phase Tracking method.
What should be understood that is: the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (2)
1, the anti-interference method of Phase Tracking is characterized in that this method may further comprise the steps:
S1. by the local pseudo random sequence Ri that produces of receiver as the Spin Control amount;
S2. according to pseudo random sequence Ri current constellation is carried out the symbol scrambling on complex plane:
At first pseudo random sequence Ri is mapped as angle to be rotated, getting Ri is any one binary number, and angle then to be rotated is
Wherein coefficient k is more than or equal to 0 smaller or equal to 3 arbitrary integer, and Ri and coefficient k are for corresponding one by one;
Then current constellation is carried out
The phase place rotation of angle, promptly obtaining according to pseudo random sequence Ri is that the center has rotated to current constellation with the complex plane initial point
Constellation after the angle;
S3. the constellation after the symbol scrambling is carried out phase demodulation, to phase demodulation output carrying out loop filtering;
S4. with the number of degrees of the controlled quentity controlled variable behind the loop filtering, phase constellation is compensated as the control phase shift.
2, realize the device of Phase Tracking anti-interference method as claimed in claim 1, comprise phase shifter, phase discriminator, loop filter, pseudo-random sequence generator and symbol scrambler, the output that it is characterized in that phase shifter and pseudo-random sequence generator is connected with the input of symbol scrambler respectively, the output of symbol scrambler is connected with the input of phase discriminator, the output of phase discriminator is connected with the loop filter input, and the output of loop filter is connected with the input of phase shifter; The input of described phase shifter is connected with the output of the carrier frequency recovery module of external system, and the output of the phase shifter of jamproof Phase Tracking device is connected with the input of the judging module of external system;
Described pseudo-random sequence generator is used to produce pseudo random sequence Ri as the Spin Control amount; Described symbol scrambler comprises mapper and multiplier, is used for carrying out the symbol scrambling according to the current constellation that pseudo random sequence Ri exports the phase device on complex plane;
Described mapper is mapped as angle to be rotated with pseudo random sequence Ri, and getting Ri is any one binary number, and angle then to be rotated is
Wherein, coefficient k is more than or equal to 0 but smaller or equal to 3 arbitrary integer, and Ri and coefficient k are for corresponding one by one;
Described multiplier carries out current constellation
The phase place rotation of angle is that center rotated to current constellation with the complex plane initial point according to pseudo random sequence Ri promptly
Constellation after the angle.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101826889A (en) * | 2010-03-31 | 2010-09-08 | 北京航空航天大学 | Binary offset carrier signal tracking loop |
| CN101867552A (en) * | 2010-06-10 | 2010-10-20 | 清华大学 | OFDM (Orthogonal Frequency Division Multiplexing) system signal sending method, receiving method and device |
| CN102307069A (en) * | 2011-09-15 | 2012-01-04 | 中兴通讯股份有限公司 | System and method for compensating OFMD (orthogonal frequency division multiplexing) signal dispersion |
| CN102420790A (en) * | 2011-11-28 | 2012-04-18 | 清华大学 | Equalization processing method in single carrier ultra wide band communication system and system thereof |
| WO2018177161A1 (en) * | 2017-03-29 | 2018-10-04 | 华为技术有限公司 | Phase adjustment method, related device and communication system |
Family Cites Families (4)
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| KR100506198B1 (en) * | 1998-07-20 | 2005-08-08 | 삼성전자주식회사 | Multichannel digital receiver for global positioning system |
| CN1917410B (en) * | 2005-08-19 | 2010-12-29 | 北京信威通信技术股份有限公司 | Method for encoding and modulating channel inn SCDMA system |
| CN2907095Y (en) * | 2005-09-13 | 2007-05-30 | 浙江华立通信集团有限公司 | Novel highly integrated embeddable Rake receiver system |
| CN101083484B (en) * | 2007-06-06 | 2010-10-13 | 曼沙尔有限公司 | Multi-path tracking apparatus and method for CDMA communication system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101826889A (en) * | 2010-03-31 | 2010-09-08 | 北京航空航天大学 | Binary offset carrier signal tracking loop |
| CN101826889B (en) * | 2010-03-31 | 2013-04-03 | 北京航空航天大学 | Binary offset carrier signal tracking loop |
| CN101867552A (en) * | 2010-06-10 | 2010-10-20 | 清华大学 | OFDM (Orthogonal Frequency Division Multiplexing) system signal sending method, receiving method and device |
| CN102307069A (en) * | 2011-09-15 | 2012-01-04 | 中兴通讯股份有限公司 | System and method for compensating OFMD (orthogonal frequency division multiplexing) signal dispersion |
| CN102307069B (en) * | 2011-09-15 | 2016-09-28 | 中兴通讯股份有限公司 | A kind of system and method for ofdm signal dispersion compensation |
| CN102420790A (en) * | 2011-11-28 | 2012-04-18 | 清华大学 | Equalization processing method in single carrier ultra wide band communication system and system thereof |
| WO2018177161A1 (en) * | 2017-03-29 | 2018-10-04 | 华为技术有限公司 | Phase adjustment method, related device and communication system |
| US10938617B2 (en) | 2017-03-29 | 2021-03-02 | Huawei Technologies Co., Ltd. | Phase adjustment method, related device, and communications system |
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