Using directional antennas for medium access control in ad hoc networks
Proceedings of the 8th annual international conference on Mobile computing and networking
Proceedings of the 5th ACM international symposium on Mobile ad hoc networking and computing
A Multi-Radio Unification Protocol for IEEE 802.11 Wireless Networks
BROADNETS '04 Proceedings of the First International Conference on Broadband Networks
Fundamentals of wireless communication
Fundamentals of wireless communication
DSMA: an access method for MIMO ad hoc networks based on distributed scheduling
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WARP: a flexible platform for clean-slate wireless medium access protocol design
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Proceedings of the ACM SIGCOMM 2008 conference on Data communication
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IEEE Transactions on Information Theory
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INFOCOM'10 Proceedings of the 29th conference on Information communications
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Transmission capacity of ad hoc networks with spatial diversity
IEEE Transactions on Wireless Communications - Part 1
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MIMO capacity with interference
IEEE Journal on Selected Areas in Communications
Spatial Interference Cancellation for Multiantenna Mobile Ad Hoc Networks
IEEE Transactions on Information Theory
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In this paper, we demonstrate that multiple concurrent asynchronous and uncoordinated Single-Input Multiple-Output (SIMO) transmissions can successfully take place even though the respective receivers do not explicitly null out interfering signals. Hence, we propose simple modifications to the widely deployed IEEE 802.11 Medium Access Control (MAC) to enable multiple non-spatially-isolated SIMO sender-receiver pairs to share the medium. Namely, we propose to increase the physical carrier sense threshold, disable virtual carrier sensing, and enable message-in-message packet detection. We use experiments to show that while increasing the peak transmission rate, spatial multiplexing schemes such as those employed by the IEEE 802.11n are highly non-robust to asynchronous and uncoordinated interferers. In contrast, we show that the proposed multi-flow SIMO MAC scheme alleviates the severe unfairness resulting from uncoordinated transmissions in 802.11 multi-hop networks. We analytically compute the optimal carrier sense threshold based on different network performance objectives for a given node density and number of receive antennas.