Topological Interference Management with just Retransmission: What are the "Best" Topologies?
Navid Naderializadeh, Aly El Gamal, A. Salman Avestimehr

TL;DR
This paper investigates interference management in topology-aware wireless networks using retransmission schemes, establishing conditions for optimal symmetric DoF and demonstrating their practical relevance and rate improvements.
Contribution
It introduces a necessary and sufficient condition for achieving half symmetric DoF with retransmission schemes, linking topology to interference neutralization capabilities.
Findings
Half symmetric DoF is achievable under the identified topology condition.
Existence of a set of transmitters for interference neutralization is guaranteed when the condition is met.
Retransmission schemes provide practical throughput gains beyond asymptotic DoF results.
Abstract
We study the problem of interference management in fast fading wireless networks, in which the transmitters are only aware of network topology. We consider a class of retransmission-based schemes, where transmitters in the network are only allowed to resend their symbols in order to assist with the neutralization of interference at the receivers. We introduce a necessary and sufficient condition on the network topology, under which half symmetric degrees-of-freedom (DoF) is achievable through the considered retransmission-based schemes. This corresponds to the "best" topologies since half symmetric DoF is the highest possible value for the symmetric DoF in the presence of interference. We show that when the condition is satisfied, there always exists a set of carefully chosen transmitters in the network, such that by retransmission of their symbols at an appropriate time slot, we can…
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Taxonomy
TopicsCooperative Communication and Network Coding · Advanced MIMO Systems Optimization · Advanced Wireless Network Optimization
