Joint Carrier, Phase and Frequency
Offset Tracking in OFDM Systems
Tampere, Finland, September 5-8, 2000.
In this paper, we study an OFDM system subject to
carrier phase noise and frequency offset. Contrary to many
previous approaches, we assume that the carrier phase and
frequency offset are drifting.
A scheme for joint estimation
of the transmitted sequence and tracking of the carrier phase
and frequency offset is prsented. The proposed iterative
scheme is based on the ECM algorithm - an extension of the
EM algorithm - and it performs the joint estimation in a
unified manner by, as it turns out, interconnecting an
Extended Kalman Smoother with Yule-Walker type equations.
CDMA Channel Tracking,