Optimal design of virtual MIMO for WSN performance improvement

Authors:
Kan Baoqiang;Lei Zhao;J. H. Fan;J. Y. Wang
Affiliations:
PLA University of Technology, Nanjing, China;Laboratory of Sensor Networks and Institute of Computing Technology and Academy of Sciences, Beijing;PLA University of Technology, Nanjing, China;College of Missle, Air Force Engineering University, Xi'an, China
Venue:
WSEAS TRANSACTIONS on COMMUNICATIONS
Year:
2011

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Abstract

In this paper, we studied the performance of bit error rate(BER) for a virtual multiple-input multiple-output (MIMO) based communications architecture. As a case, wireless sensor networks with clusters were considered. Then an optimal transmitting power(TP) scheme for cooperative sensor nodes was presented. Specifically, by minimizing BER of the Nt×1 virtual MIMO system, we derived the closed-form of the optimal TP for each cooperating node in one cluster. Through simulations, we compared this strategy with an equal TP assignment method. Its performance enhancement was verified by extensive simulations under different scenes. At the aim to energy efficient, a thorough explanation of optimally choosing number of cooperating nodes was also delivered by the aid of mathematical analysis as well as simulation verifications.