一种新的无线网络信号干扰累加捕获模型

A New Capture Model Based on Cumulative Signal Interferences for Wireless Ad Hoc Networks

目前的模拟器大都基于传统的无线网络物理层捕获模型,然而,由于无线硬件技术的发展,实际的无线网卡已经具备了在先后到达接口的多个信号中进行有选择捕获的高级接收功能,不论接收的信号是否为最先到达接口的.目前还没看到有模拟器实现高级物理层捕获算法,使得理论研究和实际情况脱节.本文试图解决这样的问题,首先,给出了一个基于信号累加机制的干扰模型,在此基础上提出了一个新的高级捕获模型,用模拟器进行了实现,并给出了仿真分析,其模拟结果证明,节点密度增加不到3倍的情况下,丢包率增加了近5.5倍,足以说明信号累加效应带来的巨大影响.

Most of the simulators are based on traditional wireless physical capture model,but with the development of hardware,the wireless card gains the capability of selective receiving among several packet in deferent intervals whatever which packet arrive first. Unfortunately there has no related physical capture model been realized on simulators,leaving the gap between theoretical research and hardware reality. This paper tries to solve such problem. Firstly,an interference model based on cumulative signal effect is proposed and an advanced capture model is then built. Upon this capture model a realization on simulator has been given out. The numerical experiment demonstrate that the packet drop rate increased 5.5 times with the node density add up to 3 times. The result shows that the cumulative signal interference has tremendous effect on packet receiving.