32APSK carrier wave loop synchronous locking detection method

Abstract

The invention provides a 32APSK carrier wave loop synchronous locking detection method, and aims to provide a detection method which is accurate in judgment and is not influenced by input signal amplitude. The invention is realized through the following technical scheme: a carrier loop locking state detection module takes out demodulation points from the I data storage module and the Q data storage module respectively; a 32APSK outer ring judgment point calculation module and a 32APSK constellation judgment module are sent to the rear end; inner and outer ring judgment thresholds are calculated; after constellation points of the inner ring and the middle ring are thrown away, the constellation points of the outer ring are sent to a normalization signal high-order moment calculation module; a normalized high-order moment of the outer ring point is calculated; the threshold adjustment module completes the judgment threshold of the outer ring; and the carrier synchronous locking detection loop sends the judgment threshold value of the threshold value adjustment module and the normalized high-order moment calculation value of the high-order moment calculation module to the comparator at each moment, compares the judgment threshold value with a preset locking threshold value, judges the locking state of the 32APSK carrier loop and outputs a carrier locking indication state.

Description

technical field [0001] The invention relates to a detection method for synchronous locking of a 32APSK carrier loop for detecting the locked state of a carrier demodulation loop in a 32APSK digital demodulator in the field of wireless communication. [0002] technical background [0003] In the satellite communication system, the satellite communication receiver often needs to achieve carrier synchronization under a large frequency deviation, and the channel characteristic of the satellite channel is a typical nonlinear channel. According to this channel characteristic, the system is required to adopt constant Envelope modulation to avoid severe nonlinear distortion, so PSK modulation methods are usually used in satellite communications, such as BPSK, QPSK, 8PSK, etc. However, with the continuous development and progress of science and technology, people have more and more demands for information, higher quality requirements, and correspondingly higher requirements for inform...

AI Technical Summary

Problems solved by technology

Compared with other low-order modulation modes, 32APSK signal constellation points are densely distributed, so it is easily affected by noise, input signal amplitude, etc. when determining carrier lock, resulting in inaccurate determination of lock indication

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