Optimal joint source-relay multi-resolution multicast networks

The paper studies the scenario of wireless multicast with a single transmitter and a relay that jointly deliver successively refined (or multi-resolution) sources to multiple receivers. By taking the end-to-end mean square error distortion (EED) as the performance metric, the problems of power allocation at the transmitter and relay are formulated. Due to nonlinearity of the formulations, a generalized programming algorithm is developed to obtain near optimal solutions. Case studies are conducted to verify the proposed formulations and solution approaches. The results show the advantages of using a relay assisted multiresolution approach.