%0 Journal Article
	%A Seung-Jun Yu and  Yong-Jun Kim and  Jung-In Baik and  Hyoung-Kyu Song
	%D 2016
	%J International Journal of Electronics and Communication Engineering
	%B World Academy of Science, Engineering and Technology
	%I Open Science Index 116, 2016
	%T Adaptive Transmission Scheme Based on Channel State in Dual-Hop System
	%U https://publications.waset.org/pdf/10005200
	%V 116
	%X In this paper, a dual-hop relay based on channel state is studied. In the conventional relay scheme, a relay uses the same modulation method without reference to channel state. But, a relay uses an adaptive modulation method with reference to channel state. If the channel state is poor, a relay eliminates latter 2 bits and uses Quadrature Phase Shift Keying (QPSK) modulation. If channel state is good, a relay modulates the received symbols with 16-QAM symbols by using 4 bits. The performance of the proposed scheme for Symbol Error Rate (SER) and throughput is analyzed.
	%P 1083 - 1086