Frequency offset compensation method and system

Abstract

The present invention proposes a frequency offset compensation method and system. The method includes: the acquisition module receives the baseband signal, completes the work of estimating the frequency offset and code phase, generates carrier frequency estimation, and sends the carrier frequency update flag pulse to the carrier generation module; The module generates a single carrier signal with a corresponding frequency offset that is synchronous with the baseband signal timing; the frequency offset compensation module starts to work after receiving the carrier signal from the carrier generation module, and performs conjugate multiplication of the carrier signal and the baseband signal to generate a baseband that eliminates the estimated frequency offset The signal is output to the tracking module; the tracking module generates an estimated frequency offset value and a carrier frequency update pulse, and sends them to the carrier generation module; the carrier generation module corrects the frequency of the generated single-carrier signal; the frequency offset compensation module compares the single-carrier signal and the baseband signal Carry out conjugate multiplication, and output the baseband signal after compensating the frequency offset. The present invention adopts two-stage estimation, estimates frequency offset step by step and eliminates it, improves frequency offset compensation accuracy, and saves computing resources.

Description

technical field [0001] The invention belongs to the technical field of signal frequency offset compensation, and in particular relates to a frequency offset compensation method and system. Background technique [0002] In a digital communication system, in order to transmit the baseband signal in the form of a high-frequency carrier, the transmitting end needs to perform up-conversion processing; at the same time, the receiving end needs to extract the narrow-band signal from the high-frequency carrier for down-conversion processing. Since the clocks of the local oscillators at the transmitting end and the receiving end are inconsistent, the oscillation frequencies of the oscillators on the corresponding up-conversion and down-conversion circuits are also inconsistent, that is, there is a frequency offset. [0003] The frequency compensation modules in the prior art mostly estimate the signal frequency offset once, which will occupy too many system resources when the estimat...

AI Technical Summary

Problems solved by technology

[0003] Most of the frequency compensation modules in the prior art estimate the signal frequency offset once, which will occupy too many system resources when the estimation accuracy is high, and the estimation accuracy will often decrease when the system resources are saved, and it is difficult to achieve both

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