Paper Info
Title
Cognitive relay-sharing by using hierarchical modulation under interference constraints
Abstract
In this paper, we investigate relay-sharing in cognitive radio (CR) networks to improve the secondary user's (SU's) performance in the presence of interference. It is assumed that the relay is shared simultaneously between both the primary user (PU) and the SU by using hierarchical modulation at the relay node while mapping the PU's and the SU's symbols onto two different layers of the hierarchical constellation. The proposed scheme relies on power adjusting, where the SU power adjustment is based on channel side information (CSI) and tolerable interference limit at the PU. Theoretical analyses along with simulation results are provided to evaluate the performance of the proposed dynamic spectrum sharing scheme. The results demonstrate that the proposed relay-sharing scheme may result in about 7dB and 15dB signal to noise ratio (SNR) improvement for the SU in low-SNR and high-SNR regimes, respectively.
Year
DOI
Venue
2014
10.1109/GLOCOM.2014.7036935
Global Communications Conference
Keywords
Field
DocType
cognitive radio,modulation,radio spectrum management,radiofrequency interference,relay networks (telecommunication),SU power adjustment,channel side information,cognitive radio networks,cognitive relay-sharing,dynamic spectrum sharing scheme,hierarchical constellation,hierarchical modulation,interference constraints,power adjusting,primary user,relay node,secondary user performance,signal to noise ratio improvement,tolerable interference limit
Topology,Telecommunications,Computer science,Signal-to-noise ratio,Co-channel interference,Communication channel,Real-time computing,Interference (wave propagation),Hierarchical modulation,Relay,Cognitive radio,Phase-shift keying
Conference
ISSN
Citations 
PageRank 
2334-0983
2
0.38
References 
Authors
5
4
Name
Order
Citations
PageRank
Khakzad, H.150.76
Shakeri, R.220.38
Taherpour, A.360.79
Khattab, T.491.69