Wireless Communications
A Cross-Layer Admission Control Framework for Wireless Ad-Hoc Networks using Multiple Antennas
IEEE Transactions on Wireless Communications
IEEE Journal on Selected Areas in Communications
A framework for uplink power control in cellular radio systems
IEEE Journal on Selected Areas in Communications
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Carrier Sense Multiple Access (CSMA) is the conventional medium access method used in wireless Ad Hoc networks. It can be enhanced as a Space-Division based CSMA (namely, SD-CSMA) by using multi-antenna techniques, which allows concurrent link communications in the network. In this paper, we present a MAC design that can adaptively switch between CSMA and SD-CSMA in multi-antenna based Ad Hoc Networks. We first investigate the CSMA mode and the SD-CSMA mode by considering several practical constraints from MIMO physical layer, which include imperfect channel estimation, modulation and coding scheme, MMSE detection, power constraint and packet length. We then propose a selection criterion that adaptively switches between CSMA and SD-CSMA based on current wireless channels among nodes. Simulation results verify that the proposed design can outperform both the CSMA mode and the SD-CSMA mode in terms of aggregate throughput.