Parameter estimation for OFDM with transmit receive diversity

Abstract

This paper proposes a channel parameter estimation technique, for Q transmit and L receive (Q /spl times/ L), space time diversity combining scheme. The algorithm is further specialised for the case when 2 transmit and L receive antennas are used along with Alamouti's (see IEEE JSAC, vol.16, no.8, 1998) space time diversity combining technique. OFDM modulation is used and channel parameters are estimated with the help of pilot symbols. The estimated parameters are the channel coefficients and the noise variance. The proposed algorithm provides results that are within 1.5 dB of the theoretical performance curve obtained with a perfect knowledge of the channel. Low computational complexity and good accuracy of the proposed algorithm deems it appropriate for various wireless applications.