基于多跳位置估计的无线光自组网拓扑重构

Topology reconfiguration of wireless optical ad hoc networks based on multi-hop location estimation

设计了基于多跳位置估计的无线光移动自组织网络拓扑重构方法,该方法不依赖定位系统,如全球定位系统(global positioning system,GPS)等,也不需要无线电通信辅助,仅采用自由空间光(free space optical,FSO)对网络中其他节点进行方向和距离估计,位置估计信息通过多跳方式传递,用于建立重构链路,增加节点连通度,提高网络性能。该方法分析了多跳节点间的位置不确定区域,并提出了覆盖不确定区域的光波束分配算法用于新的FSO链路建立。仿真表明,在节点规模小于20的自组织网络中,光束发散角大小与距离估计误差决定相对定位精度,并影响重构网络节点端到端性能,通过减小发散角并提高光检测灵敏度,该方法的性能接近基于GPS定位的重构方法。

A method of free space optical(FSO)communication ad hoc network topology reconstruction based on multi-hop position estimation is designed.This method is global positioning system(GPS)and radio frequency(RF)free,only uses FSO to estimate the direction and distance of neighbor nodes,and exchanges position estimation information through multi-hop mode to establish more FSO links which may increase the connectivity of network and improve the network transmission performance.The location uncertainty region between multi-hop nodes is analyzed and FSO new links are established by using the proposed beam allocation algorithm.The simulation results show that the relative positioning accuracy is determined by the beam divergence angle and the distance estimation error with the node size less than 20,and the end-to-end performance of the reconfiguration network node is affected.By reducing the divergence angle and improving the optical detection sensitivity,the performance of the method is close to that of the reconstruction method based on GPS positioning.