Efficient power allocations in wireless ARQ protocols

Abstract

In this paper, efficient power allocation strategies for ARQ protocols operating in wireless environments are studied. Power as well as transmission rate is optimally adapted by the sender based on channel state information (CSI) obtained through feedback, while guaranteeing quality-of-service (QoS) constraints such as average throughput or average delay. The power policies adopted for basic ARQ protocols are characterized, and a comparison of their performance is studied. Numerical results are presented for a Rayleigh fading channel.