BER-based Power Allocation for Decode-and-Forward Relaying with M-QAM Constellations

Authors:	M. Wu, D. Wübben, A. Dekorsy
Abstract:	In this paper we develop a power allocation scheme for a single-relay system applying Decode-Forward (DF) based on the resulting bit error rate (BER) at the destination. First, an analytical expression for the BER for M-QAM modulation considering estimation errors at the relay is derived. Based on this expression, the total transmit power is optimally assigned to the source and the relay in order to minimize the probability of errors at the destination. The preciseness of the derived closed form expression as well as the superior performance of the proposed DF-based relaying system are demonstrated by simulation results.
Document type:	Conference Paper
Publication:	Istanbul, Turkey, 4. - 8. July 2011
Conference:	7th International Wireless Communications and Mobile Computing Conference (IWCMC 2011)
Files:	141 KB BibTEX