On the value of cooperation in interference relay networks

Authors

Veniamin I. Morgenshtern and Helmut Bölcskei

Reference

Allerton Conference on Communication, Control, and Computing, Monticello, IL, pp. 1939-1949, Sept. 2005, (invited paper).

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Abstract

We study fading interference relay networks where M single-antenna source-destination terminal pairs communicate concurrently through a set of K relays, each of which is equipped with N (cooperating) transmit/receive antennas, using half-duplex two-hop relaying under the two protocols introduced in [1] and [2], respectively. The main contributions of this paper are: 1) For fixed N and M,K going to infinity, we establish the impact of cooperation at the relay level on network capacity scaling. More specifically, it is shown that asymptotically in M and K cooperation in groups of N relay antenna elements leads to an N-fold reduction in the total number of relays needed to achieve a given per source-destination terminal pair capacity. 2) We characterize the rate at which the network "crystallizes'', i.e., the individual single-input single-output source-destination terminal pair links decouple and the corresponding random (fading) channel gains converge to a deterministic limit.

Keywords

Interference relay channel, distributed orthogonalization, cooperation, capacity scaling, crystallization, large deviation theory

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