一种适用于物联网设备的自适应跳频方法  

Frequency-adaptive Technology Implementing in Internet of Things System

作　　者：楼亮亮[1,2,3] 熊勇[1,2,4] 周苗[1,2,4] 鲍星合[1,2,4] 谷宇章[1,2,4] 

机构地区：[1]中国科学院上海微系统与信息技术研究所,上海200050 [2]中国科学院无线传感网与通信重点实验室,上海201800 [3]上海大学通信与信息工程学院,上海200072 [4]上海物联网有限公司,上海201800

出　　处：《计算机与现代化》2014年第8期1-4,10,共5页Computer and Modernization

基　　金：国家科技重大专项(2014ZX03005001-002);上海市科学技术委员会重点项目(12511503300;11DZ0512500;12DZ2250200);上海市科学技术委员会资助课题(12511501700)

摘　　要：由于2.4 GHz频段的免授权性和开放性,新的无线系统在该频段内的自由接入必定会受到同频系统的干扰。针对上述问题,采用自适应跳频技术保证通信双方在通信中自动适应信道变化,实时避开频率集中被干扰的频点,提高通信的可靠性和抗干扰能力。首先介绍自适应跳频技术的2种相关算法,时间同步及信道评估算法,接着介绍基于CC2500的物联网设备的具体实现流程,并采用公共信道实现跳频信令的传输,在基于CC2500的物联网设备上做了具体实践,最后通过实验分析表明,该跳频算法具有一定的实用性和先进性。The license-free ISM 2. 4 GHz band is widely used on a global scale,and the new access of wireless systems in the ISM band is interfered by other wireless systems. Aiming at this disadvantages described above,this paper presents a method based on technology of adaptive frequency hopping（ AFH）,avoiding using those frequency points interfered to improve the reliability and antijamming capability of communication. At first,this paper introduced two algorithms to support AFH technology：time synchronization algorithm and channel estimation algorithm,then introduced the specific implementation process of CC2500-based IOT devices,and made a specific practice on the CC2500-based devices. And at last,experimental analysis shows that the frequency hopping algorithm is of a certain practicality and advanced.

关 键 词：自适应跳频 信道检测 频率捷变 信号冲突 2 4 GHZ 

分 类 号：TN929[电子电信—通信与信息系统]