Adaptive Modulation in Decode-and-Forward Cooperative Communications With Limited Source-Relay CSI

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...

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Bibliographic Details
Published inIEEE communications letters Vol. 18; no. 12; pp. 2157 - 2160
Main Authors Chang, Min-Kuan, Chien, Feng-Tsun
Format Journal Article
LanguageEnglish
Published IEEE 01.12.2014
Subjects
Adaptive modulation
Binary phase shift keying
Cooperative systems
Decode-and-forward protocol
Multi-node cooperative communications
Probabilistic logic
Relays
Signal to noise ratio
adaptive modulation
Multi-node cooperative communications
decode-and-forward protocol
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Summary: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.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2014.2366099