On the synergistic benefits of alternating CSIT for X channel within a four-symbol channel extension

In this paper, we investigate the degrees of freedom (DoF) of the two-user single input single output (SISO) X channel with alternating channel state information at the transmitters (CSIT). Three cases are considered for the availability of CSIT; perfect, delayed and no-CSIT. Each state is associate...

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Bibliographic Details
Main Authors: Wagdy, Ahmed, El-Keyi, Amr, Khattab, Tamer, Nafie, Mohammed
Format: Conference Proceeding
Language:English
Subjects:
Context
Interference
Receivers
Signal to noise ratio
Transmitters
Upper bound
Wireless networks
Online Access:Request full text
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Summary:In this paper, we investigate the degrees of freedom (DoF) of the two-user single input single output (SISO) X channel with alternating channel state information at the transmitters (CSIT). Three cases are considered for the availability of CSIT; perfect, delayed and no-CSIT. Each state is associated with a fraction of time denoted by λ P , λ D and λ N , respectively. We provide new results for the achievable DoF of the channel when the available CSIT alternates between these three cases under a certain distribution for Λ(λ P , λ D , λ N ). Specifically, we show that the two-user SISO X channel with alternating CSIT for Λ(1/8, 3/8, 1/2) can achieve 5/4 DoF. The achieved DoF in this case lie between the maximum DoF of the channel, i.e., 4/3 DoF for Λ(1, 0, 0), and the 6/5 DoF achieved for Λ(0, 1, 0).
ISSN:1550-3607
1938-1883
DOI:10.1109/ICC.2015.7249025