Dynamic slot allocation (DSA) in indoor SDMA/TDMA using smart antenna basestation
IEEE/ACM Transactions on Networking (TON)
Capacity of Ad Hoc wireless networks
Proceedings of the 7th annual international conference on Mobile computing and networking
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
Smart Antennas for Wireless Communications: IS-95 and Third Generation CDMA Applications
Smart Antennas for Wireless Communications: IS-95 and Third Generation CDMA Applications
Transmission scheduling in ad hoc networks with directional antennas
Proceedings of the 8th annual international conference on Mobile computing and networking
Performance of Carrier Sense Multiple Access with Collision Avoidance Protocols in Wireless LANs
Wireless Personal Communications: An International Journal
Collision Avoidance in Single-Channel Ad Hoc Networks Using Directional Antennas
ICDCS '03 Proceedings of the 23rd International Conference on Distributed Computing Systems
Theoretical analysis of asynchronous multi-packet reception in 802.11 networks
IEEE Transactions on Communications
Computer Networks: The International Journal of Computer and Telecommunications Networking
IEEE 802.15.4 MAC for clustered WSNs with a directional framework
International Journal of Sensor Networks
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We consider the Medium Access Control (MAC) protocol design for nodes in a wireless LAN that use a wide-azimuth switched beam smart antenna system comprised of a multiple beam antenna array. The one-hop performance of Carrier Sense Multiple Access (CSMA) as well as Slotted Aloha for such a system is presented analytically and through simulation. The problem of synchronization of multiple beams in CSMA is investigated in our analysis. Our results show that, under heavy offered load conditions, CSMA is a good choice with nodes that have multiple-beam smart antennas, despite the performance loss due to the beam synchronization, providing a stable throughput that approaches unity and is invariant to fluctuations in the offered load. Slotted Aloha, on the other hand, is capable of higher peak throughput in a narrow range of offered loads as more switched beams are employed, but performance drastically reduces beyond optimum offered loads. We also introduce a method, Expanded Receive Rule (ERR), whereby the tight synchronization among different beams of a receiver node in CSMA is relaxed, which is observed to provide better throughput. Finally, we also present performance results for a 4-way-handshake-type carrier sense mechanism using multiple beam antennas.