Distributed orthogonalization in large interference relay networks

Authors

Veniamin I. Morgenshtern, Helmut Bölcskei, and Rohit U. Nabar

Reference

Proc. IEEE Int. Symposium on Information Theory (ISIT), Adelaide, Australia, pp. 1211-1215, Sept. 2005.

DOI: 10.1109/ISIT.2005.1523534

Abstract

We study fading interference relay networks where M single-antenna source-destination terminal pairs communicate through a set of K relays using half-duplex two-hop relaying. Two specific protocols are considered, P1 introduced in [Bölcskei et al., 2004] and P2 introduced in [Dana and Hassibi, 2003]. P1 relies on the idea of relay partitioning and requires each relay terminal to know one backward and one forward fading coefficient only. P2 requires each relay terminal to know all M backward and M forward fading coefficients and does not need relay partitioning. We prove that in the large-M limit the minimum rate of growth of K for P1 to achieve a strictly positive per source-destination terminal pair capacity is K~M^3 whereas in P2 it is K~M^2. The protocols P1 and P2 are thus found to trade off the number of relay terminals for channel state information (CSI) at the relays; more CSI at the relays reduces the total number of relays needed to achieve a strictly positive per source-destination terminal pair capacity in the large-M limit.

Keywords

Relay networks, capacity scaling, distributed orthogonalization

Comments

Compared to the version in the proceedings, minor corrections in the formulation of Theorems 1 and 2.

Download this document:

Copyright Notice: © 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.