Paper Info
Title
Improper Gaussian signaling for multiple-access channels in underlay cognitive radio.
Abstract
This paper considers an unlicensed multiple-access channel (MAC) that coexists with a licensed point-to-point user, following the underlay cognitive radio paradigm. We assume that every transceiver except the secondary base station has one antenna and that the primary user (PU) is protected by a minimum rate constraint. In contrast to the conventional assumption of proper Gaussian signaling, we allow the secondary users to transmit improper Gaussian signals, which are correlated with their complex conjugate. When the secondary base station performs zero-forcing, we show that improper signaling is optimal if the sum of the interference channel gains (in an equivalent canonical model) is above a certain threshold. Additionally, we derive an efficient algorithm to compute the transmission parameters that attain the rate region boundary for this scenario. The proposed algorithm exploits a single-user representation of the secondary MAC along with new results on the optimality of improper signaling in the single-user case when the PU is corrupted by an improper noise.
Year
DOI
Venue
2017
10.1109/TCOMM.2018.2880765
IEEE Transactions on Communications
Keywords
Field
DocType
Random variables,Interference,Cognitive radio,Receivers,Base stations,Entropy,Integrated circuits
Underlay cognitive radio,Base station,Topology,Mathematical optimization,Telecommunications,Transceiver,Communication channel,Gaussian,Canonical model,Interference (wave propagation),Mathematics,Complex conjugate
Journal
Volume
Issue
ISSN
abs/1711.09768
3
0090-6778
Citations 
PageRank 
References 
1
0.34
20
Authors
3
Name
Order
Citations
PageRank
Christian Lameiro1397.71
Ignacio Santamaría294181.56
Peter J. Schreier331732.69