Short-wave communication frequency offset tracking method

Abstract

The invention belongs to the technical field of short-wave communication, and particularly relates to a short-wave communication frequency offset tracking method, which comprises the following steps:1, setting a to-be-sent information sequence to be subjected to binary phase shift keying modulation to obtain a sending sequence signal X; transmitting the sending sequence signal through a Gaussianchannel, and obtaining a receiving sequence signal R at a receiving end; 2, segmenting the received sequence signal R, receiving the segmented sequence signals (R1,..., Ri,..., RG); sequentially carrying out dynamic frequency offset removal based on triangular positioning and fixed frequency offset removal based on Fourier transform on each section of received sequence signal; and performing frequency offset estimation on the next section of received sequence signal by taking the frequency offset removed from the current section as prior information of the next section to obtain a corrected signal. According to the method, fixed frequency offset generated due to the characteristics of components and parts and random frequency offset generated due to relative movement of a transceiver and an external environment can be removed. Due to introduction of the memory factor, the frequency can be tracked quickly, the method is simple, and engineering implementation is facilitated.

Description

technical field [0001] The invention relates to the technical field of short-wave communication, in particular to a frequency offset tracking method for short-wave communication, which can accurately remove fixed frequency offsets and random frequency offsets, and facilitate subsequent equalization and demodulation of signals. Background technique [0002] Shortwave communication refers to a radio communication technology with a wavelength of 10-100 meters and a frequency range of 3-30MHz. The radio waves emitted by short-wave communication must be reflected by the ionosphere to reach the receiving end. The communication distance is relatively long, and it is the main means of long-distance communication. Despite the continuous emergence of new radio communication systems, short-wave communication, an ancient and traditional communication method, is still widely valued by the whole world. Not only has it not been eliminated, but it is still developing rapidly. Because it ha...

AI Technical Summary

Problems solved by technology

For example, removing a fixed frequency offset usually calculates the difference value of the two frequency offsets, and compensates the frequency offset based on the difference value; or performs secondary frequency offset compensation based on the last frequency offset value, and needs to constantly change the crystal oscillator frequency of the receiver To achieve the purpose of removing frequency offset, this requires the crystal oscillator to be a controllable vibrator, which increases the cost of equipment

Images