The Impact of Adaptation Policies on Channel Capacity over Rayleigh Fading With EGC Diversity

In this paper, we study the basic diversity combining techniques and investigate analytically-derivedclosed-form expressions for the capacities per unit bandwidth for Rayleigh fading channels with equalgain combining (EGC) diversity. We consider different channel performance adaptation policies such as:power and rate adaptation with constant transmit power, channel inversion with fixed rate, and truncatedchannel inversion. A simulation of these schemes was carried out under ideal communication conditionsand their performance compared. Results obtained show that channel inversion policies gave the highestcapacity over other adaptation policies (with EGC diversity) while the constant transmit power policyyielded the lowest capacity. Furthermore, the truncated channel inversion policy outperformed otherpolicies, while the constant power policy had the lowest capacity, compared to other policies.