Cone of silence: adaptively nulling interferers in wireless networks

Dense 802.11 wireless networks present a pressing capacity challenge: users in proximity contend for limited unlicensed spectrum. Directional antennas promise increased capacity by improving the signal-to-interference-plus-noise ratio (SINR) at the receiver, potentially allowing successful decoding of packets at higher bit-rates. Many uses of directional antennas to date have directed high gain between two peers, thus maximizing the strength of the sender's signal reaching the receiver. But in an interference-rich environment, as in dense 802.11 deployments, directional antennas only truly come into their own when they explicitly null interference from competing concurrent senders. In this paper, we present Cone of Silence (CoS), a technique that leverages software-steerable directional antennas to improve the capacity of indoor 802.11 wireless networks by adaptively nulling interference. Using in situ signal strength measurements that account for the complex propagation environm...

• Type: Conference
• Year: 2010
• Where: SIGCOMM
• Authors: Georgios Nikolaidis, Astrit Zhushi, Kyle Jamieson, Brad Karp
• Keywords: 802.11, Communications, Directional Antennas, SIGCOMM 2010, Wireless Networks