Equalization pos-combining with channel estimation and MIMO joint equalization combining receivers for space-time block coding in frequency selective channels

Recently, space-time block coding has emerged as a promising spatial transmit diversity scheme, mainly due to its simple decoding complexity. As it was initially proposed, spacetime block coding was based on the assumption of flat multipath fading channel, where there is no intersymbol interference. In this paper, we investigate the performance of two different receiver proposals using space-time block coding for frequency selective fading channels. The first one, called here equalization pos-combining with channel estimation receiver, is based on the time-reverse space-time block coding proposed by Lindskog and Paulraj and it performs channel-estimation, linear combination and equalization. The second one, denoted here multiple-input multiple-output joint equalization-combining receiver, is based on the scheme presented by Meshkati and Sousa and it performs channel equalization, interference cancellation and linear combination simultaneously. Simulation results show that, increasing the signal to noise ratio, multiple-input multipleoutput joint equalization-combining can outperform equalization pos-combining with channel estimation.