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| A Cooperative MIMO Scheme Based on Limited Feedback in WSNs |
| Zhang Yu①; Li Zi②; Cai Yue-ming①; Chen Xian-ming①; Xu You-yun① |
| ①Institute of Communications Engineering of PLAUST, Nanjing 210007, China;②Chongqing Communication College, Chongqing 400035, China |
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Abstract A limited feedback-based cooperative MIMO scheme is proposed to reduce the total energy consumption in Wireless Sensor Networks (WSNs). In this scheme based on the gradient algorithm, cluster head and cooperative cluster head can automatically adjust their power using one-bit feedback. For the cooperative MISO scheme based on Alamouti-code with limited feedback in WSNs, the bit-error-rate and the energy consumption is analyzed and its energy-consumption expression about Chernoff bound is derived. Analysis and numerical results show that the proposed cooperative MISO scheme consumes less energy than the cooperative MISO scheme based on standard Alamouti-code, and obtains high energy-efficiency. If the one is always chosen, which can provide better channel to transmit data, it will reduce more energy-consumption in WSNs.
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Received: 10 December 2007
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2009, Vol. 31 
