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FREQUENCY DOMAIN ESTIMATION OF TIME VARYING CHANNELS IN OFDMA SYSTEMS: AN EM APPROACH
 

Summary: FREQUENCY DOMAIN ESTIMATION OF TIME VARYING CHANNELS IN OFDMA
SYSTEMS: AN EM APPROACH
Tareq Y. Al-Naffouri
Electrical Engineering Department,
King Fahd University of Petroleum and Minerals,
Dhahran 31261, Saudi Arabia
naffouri@kfupm.edu.sa
ABSTRACT
OFDM modulation combines advantages of high achievable
data rates and relatively easy implementation. However, for
proper recovery of input, the OFDM receiver needs accurate
channel information. Most algorithms proposed in literature
perform channel estimation in time domain which increases
computational complexity in multi-access situations where
the user is only interested in part of the spectrum. In this
paper, we propose a frequency domain algorithm for chan-
nel estimation in OFDMA systems. The algorithm performs
eigenvalue decomposition of channel autocorrelation matrix
and approximates channel frequency response seen by each
user using the first few dominant eigenvectors. In a time

  

Source: Al-Naffouri, Tareq Y. - Electrical Engineering Department, King Fahd University of Petroleum and Minerals

 

Collections: Engineering