A frequency offset estimation architecture of OFDM system in multipath Doppler spread channel

The common structure in the previously proposed maximum likelihood frequency offset estimator of the OFDM system is the correlation operation regardless of the approach used. We consider this problem under a multipath Doppler spread channel rather than a channel model consisting of a single Doppler shift that was used previously. Under this circumstance, we observe some algebraic properties of frequency offset and implicitly use it to make a new frequency offset estimation scheme. Monte-Carlo simulation shows a promising result.