短距离无线传感网络传输链路性能评估硬件设计与试验

Hardware design and testing for the performance evaluation of transmission link in short-distance wireless sensor networks

为提升城市主干道无线监测系统传输性能评估有效性,针对无线传感网络链路通信质量评估,设计出一种节点硬件电路。从不同评价因子影响角度,研究无线传感节点模拟在林荫小道上433 MHz频率下的传播特性,分别得出信号接收强度值(RSSI)、链路质量指示值(LQI)以及包接收率(PRR)与距离的关系。结果表明,拟合出的RSSI值呈对数距离损耗模型特性,η值在2.354~2.745,LQI值呈指数型曲线上升,PRR随着距离由近到远不断降低。通过传输衰减特点分析可知,在60 m处的稳定性较好,可以在此处布放节点建立传感网。传输链路性能评估的研究为实现无线传感网找到最佳理想通信路径和布放点提供了重要基础。

In order to improve the effectiveness of transmission performance evaluation of the urban arterial road wireless monitoring system,a node hardware circuit was designed aiming to communication quality evaluation for Wireless Sensor Networks.From the different evaluation perspective of the impact of factors,the propagation characteristics of wireless sensor nodes simulation at 433 MHz frequency on tree-lined trails was explored,and the relationships between signal reception strength value RSSI,link quality indication value LQI and packet reception rate PRR and distance are obtained respectively.The results show that the fitted RSSI value presents the characteristics of logarithmic distance loss model,the value ofηis between 2.354 and 2.745,and the LQI value increases with exponential curve,and the PRR keeps decreasing with distance from near to far.It can be known through the analysis of transmission attenuation characteristics,the stability at 60 meters is better,and the nodes can be deployed here to establish a sensor network.Research on performance evaluation of transmission link provides an important foundation for realizing wireless sensor networks to find the optimal ideal communication path and placement point.