An OFDM Carrier Frequency Offset Estimation Scheme with Wide Fractional Offset Estimation Range

Abstract

In this paper, we propose a carrier frequency offset (CFO) estimation scheme which is robust to the fractional CFOvariation for orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme first performs theenvelope equalization process to convert the offset estimation problem to a carrier estimation problem, and then,estimates the integer and fractional parts of CFO by using periodogram of the received signal. Especially, in theestimation stage for fraction CFO, the ratio of the square-roots of periodograms is employed enlarging the estimationrange of the stage than that of the conventional scheme. Numerical results demonstrate that the proposed schemehas better estimation performance than the conventional scheme for wider fractional CFO range in various channelconditions.