12.1 Space-Time Coding and Kalman Filtering for Diversity Transmissions through Time-Selective Fading Channels (Invited)

Most existing space-time (ST) coding schemes have been developed for fiat fading channels. To offer antenna diversity gains, they rely on channel state information (CSI) acquired at the receiver through training, or, via blind channel estimation. Differential ST modulation obviates the need for (7S1 but is less effective in rapidly fading environments. This paper develops novel ST coders and decoders that enjoy transmitdiversity gains in the presence of time-selective fading channels. Modeling the time-selective channels as random processes, we emplog Kalman filtering to estimate them and mitigate their eflects so that symbol detection benefits from transmit-diversity. Computer simulations confirm that the proposed scheme achieves robust performance in time-selective channels with a few training symbols.