无线传感器网络中协作通信的能耗优化方法研究

江若宜; 季薇; 郑宝玉

doi:10.3724/SP.J.1146.2009.00521

无线传感器网络中协作通信的能耗优化方法研究

doi: 10.3724/SP.J.1146.2009.00521

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出版历程
- 收稿日期: 2009-04-10
- 修回日期: 2010-02-09
- 刊出日期: 2010-06-19

Joint Optimization of Energy Consumption in Cooperative Wireless Sensor Networks

摘要

摘要: 针对能量受限的无线传感器网络，该文综合考虑了协作节点数量和调制方式对系统能量有效性的影响，提出一种能量最优的综合优化方法。文中首先给出了在Rayleigh衰落信道环境下，协作通信系统采用二相相移键控(BPSK)和M进制正交幅度调制(MQAM)时误码率的闭式表达，同时对协作通信的系统能耗进行了分析。在此基础上，根据能耗最小化原则对协作节点数量和调制方式进行了联合优化。仿真结果表明，与调制方式固定或协作节点数固定的系统相比，该方案能进一步降低协作通信的系统能耗。
- 无线传感器网络; 能量有效性; 协作通信; 调制方法
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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