Robust Energy-Efficient Power Control and Beam-forming in Network Flooding

Abstract

In a device-to-device wireless multi-hop communication scenario with resource-constrained devices, energy efficiency of communication plays a huge role. Based on the recently proposed Glossy network flooding protocol, we tackle the problem of robust multicast beamforming with imperfect CSI, and analyze its performance. The effect of number of CSI feedback bits B from receiving nodes to transmitting nodes on energy efficiency is investigated. Numerical simulations show that there exists an optimal number of feedback bits that maximizes energy efficiency. The programming problem for finding optimal B is formulated for a maximum allowed outage of 5% and the effect that has on energy efficiency is studied. Results show that higher outage requirements result in larger values of optimal number of feedback bits $B$ for maximum energy efficiency.