Automatic Link Maintenance in HF Radio Networks Through Cognitive Frequency Hopping Technique

Masoud Khodaverdizadeh ¹ ( Department of Electrical and Computer Engineering, Science and Research Branch, Islamic Azad University, Tehran )
Afrooz Haghbin ² ( Department of Mechanical, Electrical and Computer Engineering- Science and Research Branch, Islamic Azad University, Tehran, Iran )
Farbod Razzazi ³ ( Department of Mechanical, Electrical and Computer Engineering- Science and Research Branch, Islamic Azad University, Tehran, Iran )

Submited date : 2023-06-18 Accepted date : 2023-10-21

Keywords: Automatic Link Maintenance, Cognitive Frequency Hopping, Frequency Hopping Pattern, HF Radio Network,

Abstract :

One of the ways to increase the reliability of communication in HF radio networks is to use automatic link establishment and maintenance methods using frequency hopping techniques. After the frequency hopping link establishment, it is necessary to constantly check the status of the established link, Due to the interference conditions in the HF frequency band. Then, if the efficiency of the system decreases, necessary measures are taken to change the frequency channels used for data transmission. In this paper, the frequency hopping based automatic link maintenance (FH-ALM) method is used to solve this problem. Due to the possibility of disrupting the frequency hopping pattern used for data transmission by smart jammers, in the proposed method to deal with the interference effects of the channel and mentioned type of jammers, the cognitive frequency hopping method is used to select a new frequency hopping pattern by using an intelligent algorithm. Moreover, during data transmission, the status of frequency channels is constantly checked and the desired frequency hopping sequence is selected for the next frequency hopping period. Finally, assuming the existence of a smart jammer, the performance of the proposed automatic link maintenance system is checked in comparison with the situation where the frequency hopping pattern is randomly selected among the suitable frequency channels for communication. By simulating the proposed cognitive frequency hopping method, it is found that the use of the proposed method improves the performance of the automatic link maintenance system by more than 5 dB compared to the existing methods.

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