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Summary: An Iterative Receiver for Coded OFDM Systems
Over Time-Varying Wireless Channels
Ghazi A. Al-Rawi
, Tareq Y. Al-Naffouri
, Ahmad Bahai
, and John Cioffi
STAR Lab.
Wireless Systems
Stanford University National Semiconductor
Stanford, CA 94305 Fremont, CA 94538
Abstract-- This paper presents a low-complexity iterative
receiver for coded OFDM systems. We present an EM-based
iterative algorithm for combined channel estimation and de-
coding that makes collective use of the available data and
system constraints. Minimum number of pilots are sent only
in the first symbol of the packet to acquire the channel; then
the iterative algorithm is used to track the channel time vari-
ation, which is assumed to follow a state-space model, using
an EM-based Kalman filter. Data recovery can be achieved
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