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Summary: FREQUENCY DOMAIN ESTIMATION OF MULTIPLE ACCESS OFDM
CHANNELS
Tareq Y. Al-Naffouri and Ashfaq Ahmed Mukaddam
Electrical Engineering Dept., King Fahd University of Petroleum and Minerals, Saudi Arabia
ABSTRACT
OFDM modulation combines the advantages of high
achievable rates and relatively easy implementation. How-
ever, for proper recovery of the input, the OFDM receiver
needs accurate channel information. Most algorithms pro-
posed in literature perform channel estimation in the time
domain which increases the computational complexity in
multiaccess situations where the user is only interested in
part of the spectrum. In this paper, we propose a frequency
domain algorithm for channel estimation in OFDM. The
algorithm performs eigenvalue decomposition of the chan-
nel autocorrelation matrix and approximates the channel
frequency response seen by each user by the first few dom-
inant eigenvectors. This reduces the parameter estimation
space and allows estimation using a few number of pilots.
Index Terms-- Estimation, Orthogonal
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