Paper Info
Title
Direct link-aware relay selection for average interference-constrained underlay cognitive radio
Abstract
Cooperative relaying combined with selection exploits spatial diversity to significantly improve the performance of interference-constrained secondary users in an underlay cognitive radio network. We present a novel and optimal relay selection (RS) rule that minimizes the symbol error probability (SEP) of an average interference-constrained underlay secondary system that uses amplify-and-forward relays. A key point that the rule highlights - for the first time - is that, for the average interference constraint, the signal-to-interference-plus-noise-ratio (SINR) of the direct source-to-destination (SD) link affects the choice of the optimal relay. Furthermore, as the SINR increases, the odds that no relay transmits increase. We also propose a simpler, more practical, and near-optimal variant of the optimal rule that requires just one bit of feedback about the state of the SD link to the relays. Compared to the SD-unaware ad hoc RS rules proposed in the literature, the proposed rules markedly reduce the SEP by up to two orders of magnitude.
Year
DOI
Venue
2015
10.1109/ICC.2015.7248655
IEEE International Conference on Communications
Keywords
Field
DocType
amplify and forward communication,cognitive radio,cooperative communication,error statistics,probability,radiofrequency interference,relay networks (telecommunication),telecommunication links,SEP,SINR,amplify-and-forward relays,cognitive radio network,cooperative relaying,direct link-aware relay selection,interference-constrained secondary users,optimal relay selection,signal-to-interference-plus-noise-ratio,source-to-destination link,spatial diversity,symbol error probability
Underlay cognitive radio,Relay channel,Antenna diversity,Computer science,Symbol error probability,Computer network,Underlay,Interference (wave propagation),Odds,Relay
Conference
ISSN
Citations 
PageRank 
1550-3607
0
0.34
References 
Authors
15
2
Name
Order
Citations
PageRank
Priyanka Das1182.34
Neelesh B. Mehta297982.27