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Computer Science > Information Theory

arXiv:1405.0032 (cs)
[Submitted on 30 Apr 2014 (v1), last revised 13 Oct 2014 (this version, v2)]

Title:Distributed Space-Time Interference Alignment with Moderately-Delayed CSIT

Authors:Namyoon Lee, Ravi Tandon, Robert W. Heath Jr
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Abstract:This paper proposes an interference alignment method with distributed and delayed channel state information at the transmitter (CSIT) for a class of interference networks. The core idea of the proposed method is to align interference signals over time at the unintended receivers in a distributed manner. With the proposed method, achievable trade-offs between the sum of degrees of freedom (sum-DoF) and feedback delay of CSI are characterized in both the X-channel and three-user interference channel to reveal the impact on how the CSI feedback delay affects the sum-DoF of the interference networks. A major implication of derived results is that distributed and moderately- delayed CSIT is useful to strictly improve the sum-DoF over the case of no CSI at the transmitter in a certain class of interference networks. For a class of X-channels, the results show how to optimally use distributed and moderately-delayed CSIT to yield the same sum-DoF as instantaneous and global CSIT. Further, leveraging the proposed transmission method and the known outer bound results, the sum-capacity of the two-user X-channel with a particular set of channel coefficients is characterized within a constant number of bits.
Comments: To appear in IEEE TWC
Subjects: Information Theory (cs.IT)
Cite as: arXiv:1405.0032 [cs.IT]
  (or arXiv:1405.0032v2 [cs.IT] for this version)
  https://doi.org/10.48550/arXiv.1405.0032
Related DOI: https://doi.org/10.1109/TWC.2014.2363475

Submission history

From: Namyoon Lee [view email]
[v1] Wed, 30 Apr 2014 20:56:05 UTC (284 KB)
[v2] Mon, 13 Oct 2014 03:57:52 UTC (392 KB)
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