Performance Analysis of Distributed Cluster-Based MAC Protocol for Multiuser MIMO Wireless Networks


Azadeh Ettefagh, Marc Kuhn, Celal Esli, and Armin Wittneben


EURASIP Journal on Wireless Communications and Networking, July 2011.

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It is known that multiuser MIMO communication can enhance the performance of wireless networks. It can substantially increase the spectral efficiency of wireless networks by utilising multiuser interference rather than avoiding it. This paradigm shift has most impact on the medium access control (MAC) protocol because most existing MAC protocols are designed to reduce the interference. In this paper, we propose a novel cluster-based carrier sense multiple access with collision avoidance (CB-CSMA/CA) scheme. The proposed scheme enables multiuser MIMO transmissions in WLANs by utilising the multiuser interference cancellation capability of the physical layer. In this paper we focus on the performance analysis of CB-CSMA/CA. We investigate saturation throughput applying optimum backoff parameters and in the presence of synchronisation errors. Furthermore, we study the impact of different clustering methods on non-saturation throughput. We show that CB-CSMA/CA improves throughput significantly compared to the CSMA/CA scheme used in the IEEE 802.11 system. It is a promising approach for a variety of network configurations including typical infrastructure WLANs as well as many other wireless cooperative networks.


Cluster-based CSMA/CA, cooperative wireless networks, MIMO, WLAN, infrastructure network, clustering

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Copyright Notice: © 2011 A. Ettefagh, M. Kuhn, C. Esli, and A. Wittneben.

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