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Power-aware Relay Selection Algorithm for Cooperative Diversity in the Energy-constrained Wireless Sensor Networks  

Xiang, Gao (한국기술교육대학교 전기전자공학과)
Park, Hyung-Kun (한국기술교육대학교 정보기술공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.10A, 2009 , pp. 752-759 More about this Journal
Abstract
Cooperative diversity is an effective technique to combat multi-path fading. When this technique is applied to energy-constrained wireless sensor networks, it is a key issue to design appropriate relay selection and power allocation strategies. In this paper, we proposed a new multi-relay selection and power allocation algorithm to maximize network lifetime. The algorithm are composed of two relay selection stages, where the channel condition and residual power of each node were considered in multi-relay selection and the power is fairly allocated proportional to the residual power, satisfies the required SNR at destination and minimizes the total transmit power. In this paper, proposed algorithm is based on AF (amplify and forward) model. We evaluated the proposed algorithm by using extensive simulation and simulation results show that proposed algorithm obtains much longer network lifetime than the conventional algorithm.
Keywords
Sensor Networks; Relay Selection; Cooperative Diversity; Network Lifetime;
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