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This paper describes a low complexity, low data rate ultra-wideband system suited for use in body area network (BAN) applications. The described system has lower complexity and power consumption compared to similar systems for BAN applications. System architecture is defined and expected results in BAN communication channel are presented. Main building blocks like analog RF front-end IC and small size antennas suitable for applications on the human body have been developed and produced. Some measurement results of the implementation are presented.

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The immense public interest in Internet multimedia, and particularly World Wide Web applications, has also triggered a lot of research towards better understanding of networking requirements of such applications. In this paper, we propose a Petri net model that addresses traffic generation paiterns of Internetbased real-time block-transfer applications. The proposed model is based on Web's native HyperText Transport Protocol, and consists of three modules: client, server, and real channel. The model flexibility is achieved through adjustable system parameters. Formal validation results demonstrate the corectness of the proposed model.

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