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Computer Science > Information Theory

arXiv:1103.6060 (cs)
[Submitted on 30 Mar 2011]

Title:Interference, Cooperation and Connectivity - A Degrees of Freedom Perspective

Authors:Chenwei Wang, Syed A. Jafar, Shlomo Shamai (Shitz), Michele Wigger
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Abstract:We explore the interplay between interference, cooperation and connectivity in heterogeneous wireless interference networks. Specifically, we consider a 4-user locally-connected interference network with pairwise clustered decoding and show that its degrees of freedom (DoF) are bounded above by 12/5. Interestingly, when compared to the corresponding fully connected setting which is known to have 8/3 DoF, the locally connected network is only missing interference-carrying links, but still has lower DoF, i.e., eliminating these interference-carrying links reduces the DoF. The 12/5 DoF outer bound is obtained through a novel approach that translates insights from interference alignment over linear vector spaces into corresponding sub-modularity relationships between entropy functions.
Comments: Submitted to 2011 IEEE International Symposium on Information Theory (ISIT)
Subjects: Information Theory (cs.IT)
Cite as: arXiv:1103.6060 [cs.IT]
  (or arXiv:1103.6060v1 [cs.IT] for this version)
  https://doi.org/10.48550/arXiv.1103.6060
Related DOI: https://doi.org/10.1109/ISIT.2011.6034162

Submission history

From: Chenwei Wang [view email]
[v1] Wed, 30 Mar 2011 22:47:12 UTC (240 KB)
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Chenwei Wang
Syed Ali Jafar
Shlomo Shamai
Michele A. Wigger
Michèle A. Wigger
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