Performance of Distributed Beamforming for Dense Relay Deployments in the Presence of Limited Feedback Information
In this paper, the authors study the impact of quantized channel feedback on the performance of a (coherent) Distributed Beam-Forming (DBF) scheme. The analysis is done in the context of a Wireless Access Network, and the goal is to provide an adequate broadband coverage for users located inside buildings. In the examined scenario, instead of trying to reach the serving Base Station (BS) directly, they assume that each mobile User Equipment (UE) receives assistance from a cooperative group of network elements that is placed in close proximity (e.g., in the same room or office). This cluster of cooperative network elements is formed by a large number of low-cost Relaying Stations (RSs), which have fixed locations and are equipped with only one antenna.