A Low Complexity Integer Frequency Offset Estimation Scheme Based on Coherence Phase Bandwidth for OFDM Systems

Abstract

In this paper, we propose a low complexity integer frequency offset estimation scheme based on coherence phase bandwidth for orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme overcomes the effect of the timing offset via correlating the local and received OFDM training symbols in a coherence phase bandwidth block unit. Moreover, by utilizing a threshold to determine an interger frequency offset etimate, the proposed scheme need not calculate correlation values for all possible interger frequency offset candidates. From numerical results, it is demonstrated that the proposed scheme can estimate the integer freqeuncy offset with a reduced complexity while minataining the same level of the estimation performance.