A cooperative transmission scheme for cluster based wireless sensor networks

  • Authors:
  • Asaduzzaman Asaduzzaman;Hyung Yun Kong

  • Affiliations:
  • Department of Electrical Engineering, University of Ulsan, Ulsan, Korea;Department of Electrical Engineering, University of Ulsan, Ulsan, Korea

  • Venue:
  • ICIC'09 Proceedings of the Intelligent computing 5th international conference on Emerging intelligent computing technology and applications
  • Year:
  • 2009

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Abstract

In this paper, a cross layer approach is used to obtain spatial diversity in physical layer. We develop a low complexity cooperative diversity protocol for Low Energy Adaptive Clustering Hierarchy (LEACH) based wireless sensor networks. A simple modification in clustering algorithm of LEACH protocol is proposed to exploit virtual MIMO based user cooperation. Instead of selecting a single cluster-head at network layer, we proposed M cluster-heads in each cluster to obtain a diversity order of M in long distance communication. Due to the broadcast nature of wireless transmission cluster-heads are able to receive the data from sensor nodes at the same time. This fact ensures the synchronization required to implement a virtual MIMO based space time block code (STBC) in cluster-head to sink node transmission. Analysis and simulation results show that our proposed cooperative LEACH protocol can save a huge amount of energy over LEACH protocol with same data rate, bit error rate, delay and bandwidth requirements.