Sub-Optimum Distributed Power Allocation for Parallel Relay Networks

In this paper, we address a sub-optimum distributed power allocation (SODPA) scheme for two-hop parallel relay networks, which includes a source-destination pair and multiple relay nodes. The system employs Decode-and-Forward (DF) as relaying protocol. In the proposed scheme, each relay is assumed to be able to decode the received signal if it satisfies the given SNR threshold and may make decision individually on whether to forward the source code to destination. Compared with the work in, the proposed scheme requires only the statistical CSI at source node instead the exact instantaneous CSI. Therefore, the SODPA reduces the amount of feedback information significantly. Simulation results show that the proposed scheme can reduce the total transmit power effectively.