32APSK carrier wave loop synchronous locking detection method

A carrier loop, synchronous locking technology, applied in the modulation carrier system, digital transmission system, electrical components and other directions, can solve the problem of inaccurate determination of lock indication, and achieve the effect of easy FPGA and DSP engineering implementation, simple and reliable calculation

Active Publication Date: 2019-09-17
10TH RES INST OF CETC
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Problems solved by technology

Compared with other low-order modulation modes, 32APSK signal constellation points are densely distributed, so it is easily affec

Method used

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  • 32APSK carrier wave loop synchronous locking detection method
  • 32APSK carrier wave loop synchronous locking detection method

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Embodiment Construction

[0015] The implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0016] refer to figure 1 . According to the present invention, construct a carrier loop locked state detection module in the 32APSK demodulation module, the carrier loop locked state detection module carries out data storage to the 32APSK signal after carrier synchronization and bit synchronization; The demodulation point is taken out and sent to the back-end 32APSK outer ring judgment point calculation module and 32APSK constellation judgment module. The 32APSK constellation judgment module judges the constellation point of the input 32APSK demodulated signal, calculates its inner and outer ring judgment thresholds, and discards the inner ring and The 16 constellation points in the middle circle are sent to the normalized signal high-order moment calculation module to calculate the normalized high-order moments of the outer circle poin...

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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...

Claims

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Application Information

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IPC IPC(8): H04L27/233
CPCH04L27/233
Inventor 刘洋杜瑜
Owner 10TH RES INST OF CETC
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