On the performance of ad hoc networks with beamforming antennas
MobiHoc '01 Proceedings of the 2nd ACM international symposium on Mobile ad hoc networking & computing
Directional virtual carrier sensing for directional antennas in mobile ad hoc networks
Proceedings of the 3rd ACM international symposium on Mobile ad hoc networking & computing
Using directional antennas for medium access control in ad hoc networks
Proceedings of the 8th annual international conference on Mobile computing and networking
A MAC protocol for full exploitation of directional antennas in ad-hoc wireless networks
Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing
Deafness: A MAC Problem in Ad Hoc Networks when using Directional Antennas
ICNP '04 Proceedings of the 12th IEEE International Conference on Network Protocols
On the effectiveness of switched beam antennas in indoor environments
PAM'08 Proceedings of the 9th international conference on Passive and active network measurement
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When directional antennas are used in 802.11 based wireless LANs, higher network capacity is often accompanied with more collisions. This is due to the enhanced hidden node problem and the deafness problem that arise in the directional transmission/reception scenario. These problems are caused by an inconsistent view of the medium status by neighboring nodes. We have developed a new variation to the 802.11 protocol called sectorized MAC (S-MAC), which employs a novel architecture consisting of multiple directional antennas and multiple receivers. With a new self-interference cancellation scheme, an S-MAC node can continuously monitor the channel status in all directions in order to avoid the aforementioned problems. It is fully compatible with the standard 802.11 protocol and can inter-operate with omni-antenna-based 802.11 nodes. It is applicable to both infrastructure mode and ad hoc mode. Simulation studies show that it achieves significant capacity gains, even if only used in part of the network.