  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.
