Cooperative Mimo Communications In Wireless Sensor Networks

Mohd Riduan , Ahmad (2010) Cooperative Mimo Communications In Wireless Sensor Networks. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

For most applications, sensor nodes rely solely on batteries for their power supply and hence battery depletion may have a great impact on the overall network performance. Consequently, most of the cunent research work in wireless sensor networks (WSNs) is focusing on improving ru·chitectures and protocols with energy conservation as the main focus. Instead of using a competing approach such as used in traditional wireless networks, sensor nodes are proposed to cooperate to achieve a common goal. Multiple sensor nodes can be used to transmit and receive cooperatively and such a configuration is known as a cooperative Multiple-Input Multiple-Output (MIMO) system. Cooperative MIMO systems have been proved to reduce both transmission energy and latency in WSNs. However, most current work in WSNs considers only the energy cost for the data transmission component and neglects the energy component responsible for establishing a cooperative mechanism. When the energy cost of cooperative mechanism establishment is considered, the total energy consumed as a function of the increasing number of cooperating nodes becomes of particular interest.' In addition, most of the previous work in WSNs focused only on Space-Time Block Coding (STBC) schemes and ignored other potential MIMO schemes. In this report, both transmission ru1d circuit energies for both components are included in the performance models. Three major cooperative MIMO systems, namely Beamforming (BF), Space-Time Block Coding (STBC) ru1d Spatial Multiplexing (SM) are compared and ru1alysed. WSNs are assumed to operate in quasi-static Rayleigh fading chmmels with Af cooperating transmit nodes and N cooperating receive nodes.

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