Optimum allocation of energy and location for cooperative networks with differential modulation

The optimum resource allocation in relay networks is used to improve the error performance and increase the energy efficiency. In this paper, a two-dimensional resource allocation, i.e., the energy optimization and location optimization, is carried out based on the average symbol error rate (SER) for the system with and without a direct link. Differential modulation which bypasses the channel estimation at the transceiver is investigated using amplify-and-forward protocol for the system with multiple relays. We also show that the minimum error rate can be achieved via the joint energy-location optimization.