A DoF-Optimal Scheme for the two-user X-channel with Synergistic Alternating CSIT
Abstract
In this paper, the degrees of freedom (DoF) of the two-user single input single output (SISO) X-channel are investigated. Three cases are considered for the availability of channel state information at the transmitters (CSIT); perfect, delayed, and no-CSIT. A new achievable scheme is proposed to elucidate the potency of interference creation-resurrection (IRC) when the available CSIT alternates between these three cases. For some patterns of alternating CSIT, the proposed scheme achieves DoF, and hence, coincides with the information theoretic upper bound on the DoF of the two-user X-channel with perfect and instantaneous CSIT. The CSIT alternation patterns are investigated where the patterns that provide extraordinary synergistic gain and dissociative ones are identified.
Keywords
Cite
@article{arxiv.1404.6348,
title = {A DoF-Optimal Scheme for the two-user X-channel with Synergistic Alternating CSIT},
author = {Ahmed Wagdy and Amr El-Keyi and Tamer Khattab and Mohammed Nafie},
journal= {arXiv preprint arXiv:1404.6348},
year = {2014}
}
Comments
accepted at 2014 IEEE International Symposium on Information Theory for presentation at the symposium and for publication in the proceedings