Charalampos Liolios

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The use of sensor networks for healthcare, well-being, and working in extreme environments has long roots in the engineering sector in medicine and biology community. With the growing needs in ubiquitous communications and recent advances in very-low-power wireless technologies, there has been considerable interest in the development and application of(More)
In this work, we consider a Zigbee wireless sensor network and study the effect of different network topologies on quality of service metrics such as throughput, end-to-end delay, and packet dropping. A campus building is selected as an experimentation testbed, where several end devices are placed, together with routers and a single coordinator. In this(More)
In this work we study an adaptable SOVA/log-MAP turbo decoder for LTE mobile standard and flat Rayleigh fading channel. Particularly, this decoder is shown to adapt dynamically to different service scenarios, considering parameters like performance and complexity for indoor/low range outdoor operating environment (mobile speed of 4 km/h). We concentrate on(More)
According to published literature for turbo decoding, SOVA and log-MAP algorithms share common operations. This paper shows that the improved reconfigurable SOVA/log-MAP turbo decoder can be implemented in LTE standard for uncorrelated Rayleigh fading channel. We concentrate on physical shared channel and use pipeline turbo decoder architecture with 12(More)
Quality of service (QoS) is an important task in the design of mobile communication systems. For UMTS system in order to realise a particular service, the QoS requirements in terms of performance and latency, have to be satisfied. Considering the QoS classification according to the priority of latency or performance, possible examples of service scenarios(More)
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