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International Journal of Distributed Sensor Networks
Volume 2012 (2012), Article ID 541258, 14 pages
http://dx.doi.org/10.1155/2012/541258
Research Article

An Autonomous Packet Transmission Strategy for Opportunistic Wireless Sensor Networks

1Vocational School of Technical Sciences, Karamanoglu Mehmetbey University, 70100 Karaman, Turkey
2Department of Electrical and Electronics Engineering, Fatih University, 34500 Istanbul, Turkey
3Department of Electrical Engineering, Qatar University, P.O. Box 2710, Doha, Qatar
4Department of Electrical and Electronics Engineering, Mevlana University, 42003 Konya, Turkey

Received 24 April 2012; Revised 18 September 2012; Accepted 30 September 2012

Academic Editor: Yunghsiang Han

Copyright © 2012 Hakki Soy et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We consider a wireless sensor network that comprises a single hop between the sensor nodes and the central controller node with multiple antennas. In this system model, we concentrate on the single-beam opportunistic communication and propose two novel packet transmission schemes that can perform multiuser diversity gain based on the signal-to-noise ratio (SNR) and the normalized SNR (NSNR) measurements at the sensor nodes with single antenna. The main objective of the multiuser diversity is to increase the total throughput over the fast fading channels. Proposed schemes are based on the principle of cross-layer design that integrates with physical layer characteristics of wireless channel and medium access control (MAC) layer characteristics of network. In our design, we assume that the sensor nodes know only their own channels to the controller node and the packet transfer from the sensor nodes to the controller node is initiated when the channel quality of any node exceeds the predefined threshold at the current time slot. To determine the optimum threshold, we maximize the probability of successful packet transmission where only one sensor node transmits its packet in one time slot under the simplified collision model. Simulation results are demonstrated to compare the performance of the proposed schemes in terms of throughput, energy efficiency, and fairness. The obtained results show that the presented opportunistic strategy can be used to improve the network throughput.