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Interference Alignment for Cellular Networks

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2 Author(s)
Changho Suh ; Dept. of EECS, Univ. of California, Berkeley, CA ; Tse, D.

In this paper, we propose a new way of interference management for cellular networks. We develop the scheme that approaches to interference-free degree-of-freedom (dof) as the number K of users in each cell increases. Also we find the corresponding bandwidth scaling conditions for typical wireless channels: multi-path channels and single-path channels with propagation delay. The scheme is based on interference alignment. Especially for more-than-two-cell cases where there are multiple non-intended BSs, we propose a new version of interference alignment, namely subspace interference alignment. The idea is to align interferences into multi-dimensional subspace (instead of one dimension) for simultaneous alignments at multiple non-intended BSs. The proposed scheme requires finite dimensions growing linearly with K, i.e., ~O(K).

Published in:

Communication, Control, and Computing, 2008 46th Annual Allerton Conference on

Date of Conference:

23-26 Sept. 2008