A PSK signal synchronization method and device suitable for signal analyzers

Abstract

The invention discloses a PSK signal synchronization method and device suitable for a signal analyzer, wherein the method includes performing matching filtering on the PSK signal carrier, judging whether the matched filtering PSK signal needs to be coarsely synchronized with the carrier, and if so, using a delay Carrier coarse synchronization is carried out by the multiplication method to reduce the carrier frequency deviation to the preset deviation range, and enter the next step; otherwise, enter the next step directly; use the timing error estimation algorithm to estimate the sampling time of the signal analyzer and the optimal sampling of the symbol The time deviation; then use the timing error estimation result and the original sampling point to perform interpolation filtering to recover the sampling value at the best sampling time; use the sampling value at the best sampling time to perform carrier fine synchronization on the carrier frequency deviation to obtain accurate carrier frequency deviation , and finally get a synchronous PSK signal.

Description

technical field [0001] The invention belongs to the field of signal synchronization, in particular to a PSK signal synchronization method and device suitable for a signal analyzer. Background technique [0002] The development of modern wireless communication systems puts forward higher requirements on communication capacity and signal quality. Since digital modulation signals have higher modulation efficiency and better anti-interference performance than analog modulation, modern main communication systems have shifted from analog modulation to digital modulation, and PSK digital modulation signals are widely used in satellite communications, wireless interconnection and other fields. PSK signal demodulation mainly consists of two typical implementation schemes: [0003] (1) Phase-locked loop closed-loop synchronization scheme [0004] Most of the general digital demodulation schemes are realized by phase-locking technology, such as figure 2 shown. Its main feature is t...

AI Technical Summary

Problems solved by technology

A long demodulation capture time means that more signal sampling points are needed to participate in the calculation to achieve demodulation, and the increase of demodulation time will inevitably reduce the demodulation efficiency; if the carrier frequency of the modulated signal and the receiving frequency of the signal analyzer exceed the signal analyzer's The frequency offset capture range requires manual adjustment of the signal receiving frequency to complete the demodulation, resulting in the need for more operation steps

[0010] The current signal analyzer products generally cannot take into account the above three test requirements. The demodulation time and frequency offset range cannot be achieved at the same time. In order to ensure demodulation efficiency, most products can only demodulate frequency offset signals with a symbol rate of about 10%. The adaptability of carrier frequency offset needs to be further improved

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