Parameter estimation for OFDM with transmit receive diversity

This paper proposes a channel parameter estimation technique, for Q transmit and L receive (Q x 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 space time diversify combining technique. OFDM modulation is used and channel parameters, are estimated with the help of pilots symbols. The estimated parameters are 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.