Cooperative MIMO Systems in Wireless Sensor Networks

Ahmad, Mohd Riduan (2011) Cooperative MIMO Systems in Wireless Sensor Networks. In: Radio Communications. INTECH. ISBN 978-953-307-091-9

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The Multiple-Input Multiple-Output (MIMO) term originally describes the use of the multiple antennas concept or exploitation of spatial diversity techniques. In early research work, the MIMO concept was proposed to fulfil the demand for providing reliable high- speed wireless communication links in harsh environments. Subsequently, MIMO technology has been proposed to be used in wireless local area networks and cellular networks, particularly at the base station and access point sides to tackle the challenges of low transmission rates and low reliability with no constraints on energy efficiency. In contrast, Wireless Sensor Networks (WSNs) have to deal with energy constraints due to the fact that each sensor node depends on its battery for its operation. In harsh environments, sensor nodes must be provided with reliable communication links. However, current WSN design requirements do not require high transmission rates. The concept of cooperative MIMO was introduced in WSNs by utilizing the collaborative nature of dense sensor nodes with the broadcast wireless medium to provide reliable communication links in order to reduce the total energy consumption for each sensor node. Therefore, instead of using multiple antennas attached to one node or device such in the traditional MIMO concept, cooperative MIMO presents the concept of multiple sensor nodes cooperating to transmit and/or receive signals. Multiple sensor nodes are physically grouped together to cooperatively transmit and/or receive. Within a group, sensor nodes can communicate with relatively low power as compared to inter-group communication. Furthermore, by using this cooperative MIMO concept, we can provide the advantages of traditional MIMO systems to WSNs, particularly in terms of energy efficient operation. This chapter introduces the concepts of diversity techniques and their relationship with cooperative MIMO systems and to discuss their practicality for implementation in WSNs. The approaches that we are going to use in this chapter are the comparative study and performance evaluation of major diversity techniques and their implementations in cooperative MIMO systems. The outcomes can be used as the basis for further study in order to find the most suitable cooperative MIMO scheme to be implemented in the WSN environment.

Item Type: Book Chapter
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Faculty of Electronics and Computer Engineering > Department of Computer Engineering
Depositing User: En. Mohd Riduan Ahmad
Date Deposited: 10 Jul 2012 04:17
Last Modified: 28 May 2015 02:37
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