tailieunhanh - Báo cáo hóa học: " A Novel Cluster-Based Cooperative MIMO Scheme for Multi-Hop Wireless Sensor Networks"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A Novel Cluster-Based Cooperative MIMO Scheme for Multi-Hop Wireless Sensor Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 72493 Pages 1-9 DOI WCN 2006 72493 A Novel Cluster-Based Cooperative MIMO Scheme for Multi-Hop Wireless Sensor Networks Yong Yuan 1 Min Chen 2 and Taekyoung Kwon3 1 Department of Electronics and Information Huazhong University of Science and Technology Wuhan 430074 China 2 Department of Electrical and Computer Engineering University of British Columbia BC Canada V6T1Z4 3 School of Computer Science and Engineering Seoul National University Seoul 151742 South Korea Received 4 November 2005 Revised 11 April 2006 Accepted 26 May 2006 A cluster-based cooperative multiple-input-multiple-output MIMO scheme is proposed to reduce the adverse impacts caused by radio irregularity and fading in multi-hop wireless sensor networks. This scheme extends the LEACH protocol to enable the multi-hop transmissions among clusters by incorporating a cooperative MIMO scheme into hop-by-hop transmissions. Through the adaptive selection of cooperative nodes and the coordination between multi-hop routing and cooperative MIMO transmissions the scheme can gain effective performance improvement in terms of energy efficiency and reliability. Based on the energy consumption model developed in this paper the optimal parameters to minimize the overall energy consumption are found such as the number of clusters and the number of cooperative nodes. Simulation results exhibit that the proposed scheme can effectively save energy and prolong the network lifetime. Copyright 2006 Yong Yuan 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. 1. INTRODUCTION Due to the limited energy and difficulty to recharge a large number of sensors energy efficiency and maximizing network lifetime have been the most important design goals