Investigation on Orthogonal Signals for Secure Transmission in Multiuser Communication
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In this paper the results of investigating various orthogonal signals that can be used as the carriers of users' information in a multiuser communication system are presented, primarily chaotic signals, wavelets, human body signals generated and classical orthogonal sequences like Walsh functions. In particular, the system that uses a combination of these investigated signals is analyzed in the presence of noise, fading and jamming. It was shown that a secure system can be designed that is based on the investigated signals and their combinations. For this purpose a theoretical model of communication systems is developed and then simulated and the results of simulationare presented and discussed. The aim of the research, to investigate possibility of development a secure multiuser system that is resistant to interception, interference and jamming, has been achieved.
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