Anti-jamming method and device in phase tracing

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 [0001] The invention belongs to the field of digital signals, in particular to the field of phase tracking of digital signals, in particular to an anti-jamming method of phase tracking and a device used for realizing the method. Background technique [0002] The digital signal receiver needs to perform carrier frequency recovery and phase tracking on the digital signal after analog-to-digital conversion, so as to ensure that the constellation of the signal has a stable phase, and then further judge the constellation with a stable phase. [0003] Traditional frequency recovery and phase tracking devices such as figure 1 As shown, the device includes a timing recovery module 10, a carrier frequency recovery module 11, a phase tracking module 12 and a decision module 13. The digital signal after analog-to-digital conversion enters the phase tracking module 12 through the timing recovery module 10 and the carrier frequency recovery module 11. The phase tracking ...

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Problems solved by technology

[0004] However, when a narrowband interference signal is superimposed in the channel band, the strong time correlation of the narrowband signal will have an adverse effect on the phase detector 122 and the loop filter 123, causing the output of the phase tracking module 12 to suddenly deflect clockwise or counterclockwise 90 degrees, which causes the loop to skip

The cycle skipping of the loop will cause a large number of errors in the decision module 13 in a short time, thereby affecting the performance of the receiver

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