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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.
For wireless sensor network applications in harsh environments, most protocols use frequency hopping to improve network anti-jamming capability and security.The widely used IEEE802.15.4 standard provides 16 channels in the 2.4GHz frequency band, which effectively supports frequency hopping communication However, the reliability of FH communication is closely related to the characteristics of the link. Through testing and analyzing the characteristics of wireless communication in complex indoor environments (factories and laboratories), this paper finds that the links are time-varying, Therefore, in this paper, an adaptive frequency hopping method is proposed for the link characteristics of complex indoor environments. This method evaluates the link quality of the current channel, and only when the link quality of the channel is out of the allowable range Frequency hopping.The simulation and test results show that the reliability of adaptive frequency hopping is improved by 10% ~ 16% compared with that of most industrial applications, which is an effective reliability design method.