Title: Power Allocation Strategies for Relay Assisted Communications
Authors: Semih Serbetli, Aylin Yener (Poster II, 13)

ABSTRACT

We consider relay assisted F/TDMA ad hoc networks with multiple relay nodes each of which assists the transmission of a predefined subset of sources to their respective destinations. Considering the sum capacity as the performance metric, we solve the problem of optimally allocating the total power of each relay node between the transmissions it is assisting. We consider four different relay transmission schemes, namely regenerative decode-and-forward (RDF), non-regenerative decode-and-forward (NDF), amplify-and-forward (AF) and compress-and-forward (CF). We obtain the optimum power allocation policies for the relay nodes where the entire network employs a given relaying strategy. We observe that the optimum power allocation for the RDF and NDF cases are modified water-filling solutions with both a base level and a ceiling. We also observe that relay nodes employing AF or CF may provide higher sum capacities than relay nodes employing decode-and-forward techniques when sufficient power is available at the relay nodes.