The impact of channel knowledge on energy-efficient uplink communication

In this work we address the problem of optimal resource allocation in the uplink of a wireless cellular network with Rayleigh fading channels, where the aim is to minimize the average total energy, given by the sum of the transmit energy and an overhead circuit energy, spent for packet delivery. We derive the optimal power allocation for the single-user case when varying our assumptions on the Channel State Information available at the transmitter. Starting from the ideal case of perfect and non-causal channel knowledge at the transmitter, we gradually relax the ideal assumptions and investigate the corresponding variation of the optimal policy and the experienced performance.