Interference Avoidance and Control

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Executive Summary

The throughput of a wireless network is often limited by interference caused by multiple concurrently active nodes. The conventional approach of using a "One-transmission-at-a-time" MAC protocol to combat interference leads to a significant loss of achievable throughput compared to schemes such as interference cancellation that keep all transmitters active simultaneously. Unfortunately, interference cancellation incurs significant computational complexity, and cannot be implemented with commodity hardware. In this paper, the authors propose a practical approach for improving the throughput of interfering nodes using variable-width frequency allocation. They show that variable-width channels provide significant theoretical capacity improvements, comparable to interference cancellation for infrastructure networks.

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