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A novel MAC protocol for a mobile ad hoc network with smart antennas $adaptive beamforming CSMA/CA protocol (ABF-CSMA/CA) - is presented. In ABF-CSMA/CA, training sequences are transmitted just before request-to-send (RTS) and clear-to-send (CTS) packets, so the temporal reference beamforming can be performed. An improved virtual carrier-sense mechanism is also proposed. In this scheme, every node has two kinds of network allocation vector (NAV) - omnidirectional NAV (oNAV) and beamforming NAV (WAV). Simulation results show that ABF-CSMA/CA can support smart antennas effectively and provide higher channel utilisation.
Date of Publication: 20 March 2003