Abstract
It is known that multiuser multiple-input multiple-output (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 article, 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 wireless local area networks (WLANs) by utilising the multiuser interference cancellation capability of the physical layer. In this article 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.
Highlights
Multiuser multiple-input multiple-output (MIMO) communication is an effective approach to improve the performance of a wireless system by realising distributed spatial multiplexing and/or diversity gains
While multiuser MIMO techniques can provide spatial multiplexing gains even in networks with single-antenna stations (STAs), distributed coordination function (DCF) prevents this by a collision avoidance mechanism
Contrary to [9] and [10], in which the authors focus on the diversity techniques, we focus on utilising the spatial multiplexing gain in carrier sense multiple access with collision avoidance (CSMA/CA)-based systems
Summary
Multiuser multiple-input multiple-output (MIMO) communication is an effective approach to improve the performance of a wireless system by realising distributed spatial multiplexing and/or diversity gains. Cluster-based CSMA/CA protocol Assume a network where multiple users can transmit independent data streams simultaneously and the destination nodes can efficiently decode the desired signal out of multiple streams. This is possible if there are enough degrees of freedom available at the destinations, e.g. each destination has enough antennas, or appropriate cooperation exists among nodes. The performance of the CB-CSMA/CA protocol in non-ideal conditions, e.g. where STAs in a cluster cannot transmit simultaneously or some of them may not have packets to transmit, is considered The former is achieved by taking the impact of event-synchronisation error on the network throughput into consideration. Throughput of a CB-CSMA/CA application may vary between the calculated bounds
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