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On Alternate Relaying With Improper Gaussian Signaling

Lookup NU author(s): Dr Aissa Ikhlef


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In this letter, we investigate the potential benefits of adopting improper Gaussian signaling (IGS) in a two-hop alternate relaying (AR) system. Given the known benefits of using IGS in interference-limited networks, we propose to use IGS to relieve the inter-relay interference (IRI) impact on the AR system assuming no channel state information is available at the source. In this regard, we assume that the two relays use IGS and the source uses proper Gaussian signaling (PGS). Then, we optimize the degree of impropriety of the relays signal, measured by the circularity coefficient, to maximize the total achievable rate. Simulation results show that using IGS yields a significant performance improvement over PGS, especially when the first hop is a bottleneck due to weak source-relay channel gains and/or strong IRI.

Publication metadata

Author(s): Gaafar M, Amin O, Ikhlef A, Chaaban A, Alouini MS

Publication type: Article

Publication status: Published

Journal: IEEE Communications Letters

Year: 2016

Volume: 20

Issue: 8

Pages: 1683-1686

Print publication date: 01/08/2016

Online publication date: 06/06/2016

Acceptance date: 30/05/2016

ISSN (print): 1089-7798

ISSN (electronic): 1558-2558

Publisher: IEEE


DOI: 10.1109/LCOMM.2016.2577029


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