Comparison of frequency offset estimation techniques for burst OFDM

A major impediment to high-bit-rate wireless transmission is multipath delay spread. Orthogonal frequency division multiplexing (OFDM) addresses this impairment, transmitting several parallel lower bit rate streams. Independent transmit and receive oscillators create frequency offset, generating interchannel interference and degrading performance. Several frequency offset estimation techniques have been proposed but varied test conditions make comparison difficult. Here, we compare these schemes under identical conditions and propose three new offset estimation techniques and include them in our comparison.