摘要
对于复杂恶劣环境的无线传感器网络应用,多数协议采用跳频提高网络的抗干扰能力和安全性.广泛使用的IEEE802.15.4标准在2.4GHz频段提供了16个频道,有效的支持了跳频通信的设计.但是,跳频通信的可靠性和链路的特征有着密切的关系,本文通过对复杂室内环境（工厂,实验室）无线通信特征的测试和分析发现,链路具有时变性,同时在一段相当长的时间内具有稳定性,因此本文针对复杂室内环境链路特征提出了一种自适应跳频方法,该方法通过评估当前频道的链路质量,只在频道的链路质量超出允许范围时进行跳频.仿真和测试结果表明,相比于多数工业应用采用时隙跳频方法,自适应跳频的可靠性提高了10%~16%,是一种有效的可靠性设计方法.
In order to increase the transmitting reliability for the wireless sensor network application in complex and hash environment,frequency hopping is often adopted to improve the anti-interference ability.This paper measured and analyzed the 2.4Ghz IEEE802.15.4 link characteristics in factory and lab environment,and based on the results,an adaptive frequency hopping method was proposed to meet high reliability requirements in complex indoor applications.The implementation of the algorithm on IEEE802.15.4 MAC was given,and the simulation and testing results compared with slotted hopping show that the new method has increased the communication reliability by 10%~16%.
出处
《小型微型计算机系统》
CSCD
北大核心
2010年第9期1735-1741,共7页
Journal of Chinese Computer Systems
基金
国家"八六三"高技术研究发展计划重大项目(2007AA041201)资助
国家"八六三"高技术研究发展计划项目(2007AA04Z169)资助
国家自然科学基金项目(50674010)资助
关键词
无线传感器网络
自适应跳频
可靠性
频率分集
wireless sensor network
adaptive frequency hopping
reliability
frequency diversity
