Frequency-adaptive Technology Implementing in Internet of Things System

doi:10.3969/j.issn.1006-2475.2014.08.001

Abstract

Abstract: 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.

Key words: adaptive frequency hopping, channel detection, frequency agile, signal conflict, 2.4 GHz

CLC Number:

TN929

LOU Liang-liang1,2,3, XIONG Yong1,2,4, ZHOU Miao1,2,4, BAO Xing-he1,2,4, GU Yu-zhang1,2,4. Frequency-adaptive Technology Implementing in Internet of Things System[J]. Computer and Modernization, doi: 10.3969/j.issn.1006-2475.2014.08.001.

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