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Joint Optimization of Energy Consumption in Cooperative Wireless Sensor Networks |
Jiang Ruo-yi; Ji Wei; Zheng Bao-yu |
Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunication, Nanjing 210003, China |
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Abstract In this paper, the optimum numbers of cooperative nodes and modulation methods are analyzed to minimize the total energy consumption in a cooperative wireless sensor networks, which is power-limited. An exact closed-form expression is derived for the average BER in Rayleigh-fading channels for both BPSK and MQAM modulations, and then the energy of cooperative system is analyzed. Finally a synthetic optimization of modulation and number of cooperative nodes is presented to minimize the total energy consumption. Comparisons with the fix-rate or fix numbers of cooperative nodes systems demonstrate the significant energy saving of the synthetic optimization.
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Received: 10 April 2009
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Corresponding Authors:
Jiang Ruo-yi
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