Universiti Teknologi Malaysia Institutional Repository

HF messaging system with automatic link establishment (ALE) capability

Hasan, Nurulfadzilah (2006) HF messaging system with automatic link establishment (ALE) capability. Masters thesis, Universiti Teknologi Malaysia, Faculty of Electrical Engineering.

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HF radio spectrum, ranging from 3 to 30 MHz can be utilized for voice and data communication. One of the benefit of using HF for communicating is that HF system is low-cost, requires minimum equipments and easy to set up. But due to the unpredictability and propagation problems such as multipath fading, interference and attenuation, communication using HF becomes very challenging. Besides, the availability of the channels varies depending on the time of day, seasons and the condition of the ionosphere. The purpose of this research is to design a HF messaging system equipped with Automatic Link Establishment (ALE) capability. ALE is an adaptive radio technology for automatically establishing communications over HF single sideband (SSB) links using the best frequency possible. The objective of the research is to design a messaging system that permits reliable data transmission over the HF radio with minimum cost and equipments. This research also looked at the feasibility of implementing ALE as software, designed using Visual C++ programming language. Equipments used in this research are commercial HF radio and modem, which are both controlled by the software. Field testing is conducted between UTM Skudai and several places in Malaysia to verify the performance of the system. From the results, it is proven that by applying adaptive radio technology, propagation problems can be overcome and reliability of data transmission can be improved. Moreover, amateur radio users can use the system, as it requires minimum equipment.

Item Type:Thesis (Masters)
Additional Information:Thesis (Master of Engineering (Electrical)) - Universiti Teknologi Malaysia, 2005; Supervisor : Assoc. Prof. Dr. Ahmad Zuri Sha'meri
Uncontrolled Keywords:HF messaging system, HF radio, data transmission, HF communication system, automatic link establishment (ALE)
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:5338
Deposited By: Ms Zalinda Shuratman
Deposited On:10 Apr 2008 09:10
Last Modified:12 Jul 2012 02:42

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