Lifetime maximization for amplify-and-forward cooperative networks

Power allocation strategies are devised to maximize the network lifetime of amplify-and-forward (AF) cooperative networks in this work. We consider the scenario where one source and multiple partners cooperate to transmit messages to the destination, where the power emitted by sensors is subject to the SNR requirement at the destination. First, the power allocation strategy that demands the minimum instantaneous aggregate transmit power of all cooperating partners is described and analyzed. The optimal solution results in a form of selective relaying; namely, the sensor with the best channel condition is selected for transmission. However, this instantaneous power minimization strategy does not necessarily maximize the lifetime of batterylimited systems. Then, we propose three AF cooperative schemes to exploit the channel state information (CSI), the residual battery energy and the QoS requirement. It is shown that the network lifetime can be extended considerably by taking all these t...

• Type: Journal
• Year: 2008
• Where: TWC
• Authors: Wan-Jen Huang, Yao-Win Peter Hong, C. C. Jay Kuo
• Keywords: Network Lifetime, Power Allocation, Power Allocation Strategies, TWC 2008