Title :
Relay Selection with Constellation Rearrangement for Superposition Modulation Cooperative Relay
Author :
Wu, Lindong ; Fei, Zesong ; Luo, Chen ; Kuang, Jingming
Author_Institution :
Beijing Inst. of Technol., Beijing, China
Abstract :
In this paper, we consider a multi-relay Demodulate-and-Forward (DMF) cooperation system, in which the high order superposition modulation (SM), superposition 16-QAM modulation (16-QAM SM), is employed. For the given system, a new relay selection scheme with constellation rearrangement (CR) technique is proposed, which is based on the optimal total mutual information (MI) criterion. Firstly we find the optimal bit-symbol mappings for all the relays. And then the source chooses the best relay, which maximizes the MI, to cooperate with. We assume that all the channel state information (CSI) is available. A variety of simulations are performed and show that they match exactly with analytic ones. In addition, the result shows that our new strategy utilizing high order superposition modulation with CR outperforms the classical SM cooperation scheme and traditional DMF scheme for about 1.5 dB and 2.5 dB, respectively. Meanwhile, it improves spectrum efficiency with the same complexity.
Keywords :
cooperative communication; quadrature amplitude modulation; DMF scheme; SM cooperation scheme; channel state information; constellation rearrangement technique; high order superposition modulation; multirelay demodulate-and-forward cooperation system; optimal bit-symbol mappings; optimal total mutual information criterion; relay selection scheme; spectrum efficiency; superposition 16-QAM modulation; superposition modulation cooperative relay; Bit error rate; Modulation; Mutual information; Relays; Signal to noise ratio; Simulation; Three dimensional displays;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-6250-6
DOI :
10.1109/wicom.2011.6040192