Approximate Capacity of a Class of Gaussian Interference-Relay Networks

Soheil Mohajer, Suhas N. Diggavi, Christina Fragouli, David N. C. Tse
2011 IEEE Transactions on Information Theory  
In this paper, we study a Gaussian relay-interference network, in which relay (helper) nodes are to facilitate competing information flows between different source-destination pairs. We focus on two-stage relay-interference networks where there are weak cross links, causing the networks to behave like a chain of Gaussian channels. Our main result is an approximate characterization of the capacity region for such and networks. We propose a new interference management scheme, termed interference
more » ... eutralization, which is implemented using structured lattice codes. This scheme allows for over-the-air interference removal, without the transmitters having complete access the interfering signals. This scheme in conjunction a new network decomposition technique provides the approximate characterization. Our analysis of these Gaussian networks is based on insights gained from an exact characterization of the corresponding linear deterministic model.
doi:10.1109/tit.2011.2120210 fatcat:fd6b5xm76fcx5ouo4okyvabrey