Abstract

Coping with time-selective fading channels is challenging, but also rewarding especially with multiantenna systems, where joint space-Doppler diversity and coding gains can be collected to enhance performance of wireless mobile links. These gains have not been quanti ed, and space-time coded systems maximizing joint space-Doppler bene ts have not been designed. Based on a parsimonious basis expansion model for the underlying time-selective (and possibly correlated) channels, we quantify these gains in closed form. Furthermore, we develop space-time-Doppler coded systems that guarantee the maximum possible space-Doppler diversity, along with the largest coding gains within all linearly coded systems. Our three novel designs exploit knowledge of the maximum Doppler spread, and each oers a uniquely desirable tradeo among: high spectral eciency, low decoding complexity, and high performance. Our analytical results are con rmed by simulations that not only validate the channel model, but also reveal the relative of merits of our three designs in comparison with an existing approach.

Citations