Impact of channel-state information on coded transmission over fading channels with diversity reception

We study the synergy between coded modulation and antenna-diversity recepti on on channels affected by slow Rician fading, Specifically, we assess the impact of channel-state information (CSI) on error probability. We show tha t with a good coding and constant envelope modulations (for example, phase- shift keying) scheme the loss in performance when CSI is not available is m oderate (around 1.5 dB). Moreover, as the diversity order grows, the channe l tends to become Gaussian.