Fine Residual Carrier Frequency and Sampling Frequency Estimation in Wireless OFDM Systems

TL;DR

This paper introduces a new algorithm for residual phase estimation in wireless OFDM systems, improving accuracy in CFO and SFO estimation by exploiting subcarrier correlations and phase increments, outperforming conventional methods.

Contribution

The paper proposes a novel residual phase estimation algorithm that leverages subcarrier correlations and phase increments, enhancing performance in multipath channels.

Findings

Performance improvement over conventional schemes

Effective in multipath environments

Estimation variance results demonstrate accuracy

Abstract

This paper presents a novel algorithm for residual phase estimation in wireless OFDM systems, including the carrier frequency offset (CFO) and the sampling frequency offset (SFO). The subcarriers are partitioned into several regions which exhibit pairwise correlations. The phase increment between successive OFDM blocks is exploited which can be estimated by two estimators with different computational loads. Numerical results of estimation variance are presented. Simulations indicate performance improvement of the proposed technique over several conventional schemes in a multipath channel.