出版社：University of Rijeka, Faculty of maritime studies
摘要：This paper presents an analysis, based on the simulation model, of the existing broadband and alternative narrowband maritime VHF radiotelephone communication systems. The alternative system proposed by the ITU organization is one of the possible solutions to the lack of communication channels in the maritime VHF bands. The influence of changes in the modulation process on the quality of information in the maritime VHF radiotelephone communications is examined using a computer simulation model taking into account all the relevant technical characteristics of maritime VHF radiotelephone equipment. The process of evaluating the quality of speech signals was carried out by means of an objective quality assessment technology using a computer program that implements PESQ algorithm which ensures the comparability of obtained results with the traditional method of subjective evaluation of signal quality. The process of quality assessment was conducted using four standardized sample voice signals with different influences of external interference on the communication channel. Analysis of the results confirms the possibility of using alternative communication systems.
其他摘要：U radu je provedena analiza postojećeg širokopojasnog i alternativnog uskopojasnog komunikacijskog sustava pomorskih VHF radiotelefonskih komunikacija, zasnovanih na simulacijskom modelu. Alternativni sustav predložen je od strane ITU organizacije kao jed
关键词：maritime VHF communications; narrowband modulation; signal quality; PESQ
