无线传感器网络中协作通信的能耗优化方法研究

Joint Optimization of Energy Consumption in Cooperative Wireless Sensor Networks

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。

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.