超宽带无线传感器网络的能耗建模及其优化

摘要

A precise sensor node energy consumption mode! Was presented for ultra wide-band (UWB) wireless sensor networks (WSNs) with jointed consideration and study of the working status of each circuit module at the sensor nodes. Also, an optimal data frame length choosing algorithm was proposed to minimize the average transmitting energy for transmit 1 bit data using three modulations methods and two transmission modes. The correctness of the algorithm was verified by simulation. The simulation results show that based on guaranteeing the quality of service (QoS) of the network service (The threshold of the signal-to-noise ratio of the receiving signal at receiver is fixed at 12 dB), the data frame with large length can be selected to archive the better throughput and the less time delay when the transmitter sensor is near the receiver senor(less than 20 m), and vice versa. Also, the proper modulation method and transmission mode can be chosen according to the requests of the network service and the conditions of the network environment to minimize the energy consumption and time delay simultaneously.%在综合分析和考虑传感器节点收发机各个电路模块工作状态的基础上,首先对超宽带无线传感器网络进行精确的节点能耗建模,然后针对3种不同的调制方式和2种不同的传输模式,以最小化成功传输1 bit信息的平均传输能耗为目标提出最优数据帧帧长确定算法,最后通过仿真验证该算法的正确性.仿真结果表明,在保证网络业务服务质量的前提下(接收机处接收信号信噪比门限为12 dB),当传感器节点间距离较近(20m以内)时,可以适当地增大数据帧帧长以获取较大的吞吐量和较小的时延；当节点间距离较大(大于70 m)时,则需减小数据帧帧长以降低能量开销,并可以根据网络环境的状况和网络业务的要求,选择适当的调制方式和传输模式可以折中地同时实现能耗和时延最小化.