基于噪声的能量有效PCS门限自配置策略

无线传感器网络节点预先绑定的物理载波侦听（PCS）门限无法适应不同噪声。为此，采用圆盘模型分析PCS门限对网络性能的影响，将能量有效的PCS门限配置问题，等效为冲突概率最小与吞吐损失最小的最优PCS门限规划问题，提出一种基于随机噪声的能量有效PCS门限自配置策略（EPCS）。仿真结果表明，在方差为0．01-0．20的高斯噪声条件下，EPCS门限的吞吐率和能量有效性分别下降17．9％和34．1％，均优于预配置PCS门限的性能。

Strategy for Energy-efficient PCS Threshold Self-configuring Based on Noise

Fixed physical carrier sensing threshold is set before Wireless Sensor Network（WSN） nodes are deployed under the environment in actual using, which is not guaranteed that the fixed Physical Carrier Sensing（PCS） threshold set beforehand can work well under different environments noise. Thus, the effects on WSN performances by PCS threshold are analyzed and the problem of configuring an energy-efficient PCS threshold is equivalent to the programming of the optimized PCS to minimize both the conflicts probability and throughput loss, and a strategy for energy-efficient PCS threshold self-configuring based on noise is proposed. Simulation results show that, the throughput and energy-efficiency of the Energy-efficient PCS（EPCS） threshold are reduceding 17.9% and 34.1% respectively when the Gaussian noise with variance being 0.01 changes to the Gaussian noise with variance being 0.2, which are better than the performances of the bound PCS thresholds.