Cooperation with multiple relays in wireless sensor networks: optimal cooperator selection and power allocation
Göktürk, Muharrem Sarper and Gürbüz, Özgür (2010) Cooperation with multiple relays in wireless sensor networks: optimal cooperator selection and power allocation. (Submitted)
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In this paper, we formulate the energy minimal joint cooperator selection and power assignment problem under individual transmit power constraints such that the cooperative transmission satisfies a demanded average bit-error-rate (BER) at the destination receiver. We define the average BER of a cooperative system with multiple relays, and we propose a simple yet close approximation for the BER to facilitate simple cooperator selection mechanisms with closed form power solutions. We present the optimal solution for the joint cooperator selection and power assignment problem, and we propose a distributed implementation. We show that the energy dissipated at the transmit amplifiers can be reduced by 80%, and the total energy cost can be reduced by 20% considering current transceivers. Via thorough performance analysis considering various network topologies, target average BER levels, power consumption models that take into account the energy dissipated in the transceivers of source, cooperator and destination nodes, we demonstrate that our distributed method provides comparable energy savings with the optimal scheme, with significantly lower complexity and robust performance under channel state information errors. Our approach emerges as a practical method for wireless sensor networks, owing to its simple distributed operation that provides reliable long-haul communication with significant energy savings, without incurring frequent message updates.
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