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B. I. Filippov, PhD (technical sciences), associate professor of Information Security department, NSTU; This email address is being protected from spambots. You need JavaScript enabled to view it.
G. A. Chernetsky, PhD (technical sciences), professor of the department «Radio systems»

The aim of the work is the choice of such technical solutions which would allowreallyto receivegiven probabilistically – time response characteristics on an output of an information transmission system on hydroacoustic communication channels. In the work the comparative analysis of modems efficiency for the discrete communication channel, methods of transmission of discrete messages in hydroacoustic communication channels with limited bandpass range is made. It is offered to use generalized information characteristic of modems considering at the same time both noise immunity, and information transmission rate which is their assessment on specific relation h = Ps/Pp·γm (γm – specific information transmission rate) for a certain equivalent probability of an error peq = p/log2m (m – the code base). This characteristic allows to compare the
modems which use codes with different base and having different noise immunity. It is shown that application of signals of lattice code modulation (LCM) which combines multiposition signals and noiseproof codes allows (in case of set speed of signal transmission and probability of erratic reception) to reduce necessary power line energetics and frequency band. Such signals are considered to be the most efficient ones therefore this type of modulation can be recommended also for hydroacoustic communication systems.

Key words: hydroacoustic channel, efficiency of discrete informationtransmissionsystems, discrete messagestransmissionmodems, noise proof coding.

DOI: 10.21667/1995-4565-2017-59-1-42-52

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