On the reliable throughput supported by multiple-antenna Rayleigh-faded links for QAM coded transmissions

In this short contribution we present some novel results about the reliable information-rates supported by point-to-point multiple-antenna Rayleigh-faded wireless links for QAM coded data-transmissions. After deriving the (symmetric) capacity of these links, we present fast computable analytical upper and lower bounds that are asymptotically exact both for high and low SNRs and give rise to reliable evaluation of the link-capacity. The proposed bounds apply when (perfect) channel-state-information (CSI) is available at the receiver and allow us to understand clearly the ultimate performance of the considered multiple-antenna QAM systems. Furthermore, asymptotically exact simple upper bounds are also presented for a tight evaluation of the corresponding outage probability when quasi-static fading occurs and coded packet-transmission with interleaving is used