不同调制机制下无线传感网收发器能耗优化模型  

Optimization of Transceiver Energy Consumption in WSNs under Different Modulation Schemes

作　　者：姚信威[1] 王万良[1] 吴腾超[1] 岑跃峰[1] 

机构地区：[1]浙江工业大学计算机科学与技术学院,杭州310023

出　　处：《传感技术学报》2013年第8期1140-1146,共7页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(61070043);"十二五"国家科技支撑计划项目(2012BAD10B01)

摘　　要：针对无线传感网节点能量约束问题,提出单位比特数据传输能耗最小化模型。从物理层和硬件电路角度,建立收发器能耗模型,根据不同的调制机制,并考虑数据重传机制,提出了基于单位数据传输能耗最小化的最佳负载大小模型和最优通信距离模型。分析了在不同信号干扰、通信距离、负载大小、发射功率以及不同调制机制下的最优能耗值。实验结果进一步验证:当信号干扰强度较大时,短距离通信更有利于系统节能;随着通信距离的增加,最佳负载大小值趋于常量;采用自适应发射功率能明显降低数据传输能耗;随着通信距离或者干扰强度的增大,数据传输能耗以指数形式增加。To solve the issue of energy-constrained in Wireless sensor Networks（ WSNs）,a novel model is proposed to minimize the energy consumption per bit over an additive white Gaussian Noise channel.The energy consumption includes two aspectes： the transmission energy and the circuit energy consumption.It can be achieved by deriving expressions for the optimum transmission distance and packet length based on packet retransmission and specific modulation schemes.The values of minimized energy consumption are analyzed and compared under different interferences,transmission distances,payload sizes,transmission energies and modulations.Numerical results show：（ a） under severe wireless interference condition,it is better to use short distances to transmit datas;（ b） the optimum packet length converges to a constant value for long transmission distances;（ c） it is preferable to use adaptive transmission power to minimize energy consumption;（ d） with the increase of transmission distances or wireless interference,the energy consumption almost rapidly increases in exponential form.

关 键 词：无线传感网 能耗 优化 建模 

分 类 号：TP92[自动化与计算机技术]