Title: Adaptive Modulation in Decode-and-Forward Cooperative Communications With Limited Source-Relay CSI
Authors: Chang, Min-Kuan
Chien, Feng-Tsun
Department of Electronics Engineering and Institute of Electronics
Keywords: Multi-node cooperative communications;adaptive modulation;decode-and-forward protocol
Issue Date: 1-Dec-2014
Abstract: In this letter, we study the problem of adaptive modulation (AM) in cooperative decode-and-forward (DF) relaying systems with limited channel state information (CSI) of the source-relay link. We first develop the signal-to-noise ratio (SNR)-based opportunistic AM and obtain the regions of the source-destination and relay-destination link SNR, by which whether cooperative relaying is needed and what constellation size should be chosen can be determined without requiring the source-relay link CSI. We also propose the probabilistic AM to further enhance the transmission rate. Simulation results demonstrate the effectiveness of the proposed AM criteria.
URI: http://dx.doi.org/10.1109/LCOMM.2014.2366099
ISSN: 1089-7798
DOI: 10.1109/LCOMM.2014.2366099
Volume: 18
Issue: 12
Begin Page: 2157
End Page: 2160
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