Carrier frequency offset estimation device and carrier frequency offset estimation method

Abstract

The invention relates to a carrier frequency offset estimation device and a carrier frequency offset estimation method. A received signal and a segment of reference signal are subjected to differential correlation calculation to generate a plurality of calculation results, and M peak values with the maximum amplitude are found out. One of the M peaks each time is output as a candidate peak. The data acquisition circuit acquires a data segment corresponding to the candidate peak value from the received signal, and the data segment is used as a candidate data segment. The fast Fourier transformcircuit performs fast Fourier transform on the product of the candidate data segment and the conjugate signal of the reference data to obtain a candidate transform result. The selection circuit determines whether to select the candidate conversion result as a target conversion result according to the highest amplitude of the candidate conversion result. The carrier frequency offset calculation circuit determines a carrier frequency offset estimation value according to the frequency corresponding to the highest amplitude of the target conversion result.

Description

technical field [0001] The present invention is related to a communication system, and in particular to a technique for estimating a carrier frequency offset (CFO) in a communication system. Background technique [0002] With the advancement of related technologies in the electronic field, various types of communication systems are becoming more and more popular. Both the transmitting end and the receiving end of the communication system are respectively equipped with at least one oscillating signal source (such as a crystal oscillator) to provide a clock signal as a reference for its circuit operation. During operation, the clock frequencies of the transmitting end and the receiving end must have a certain degree of consistency, so that the receiving end can correctly interpret the signal sent by the transmitting end. [0003] If the frequency of the local clock signal used by the receiving end for down-conversion is different from the carrier frequency actually applied to...

AI Technical Summary

Problems solved by technology

Although in the face of large carrier frequency offset, Figure 1B The shown carrier frequency offset estimating device can still find out the correct carrier frequency offset estimation value ξ, but the operation procedures of the differential correlators 171-174 are quite complicated, which will consume a lot of computing resources and time

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