In the article we propose an end-to-end service composition for information transport based on principles from Service Oriented Architecture (SOA), As we show, some SOA concepts are similar to concepts in Open Systems Interconnection (OSI) reference model, with the key advantages of dynamism and flexibility. We discuss Service Oriented Networks (SON) based on transport service composition across access and core segments and we show how semantic technologies can be used for an access network selection.
COBISS.SI-ID: 22803495
An adaptive zero forcing maximum likelihood soft input soft output detector for wireless MIMO systems is presented. zmanjša za 90%, pri tem se zmogljivost sistema poslabša za manj kot 1dB v primerjavi s klasičnim algoritmom največje verjetnosti. It is shown by computer simulations that the computational complexity of new algorithm is reduced by 90% while the system performance degrades by less than 1dB in comparison to the ML detector.
COBISS.SI-ID: 22401319
The pile-up rejection in nuclear spectrometry has been confronted recently by several pile-up correction schemes that compensate for distortions of the signal and subsequent energy spectra artefacts as the counting rate increases. We study here a real-time capability of the event-by-event correction method, which at the core translates to solving many sets of linear equations. We propose a novel approach based on the Gauss-Seidel iterative method, which turns out to be a stable and cost-efficient solution to improve spectroscopic resolution in the front-end electronics.
COBISS.SI-ID: 23171879
Free Space Optics (FSO) or optical wireless systems provide high data rate solution for bandwidth hungry communication applications. FSO links are highly weather-dependent. Employing a hybrid network consisting of an FSO link and a back up link in the GHz frequency range renders high availability of the communication link and provides comparable data rates. Effects of fog, rain and snow on FSO/GHz hybrid network are studied. It is suggested in the paper, that free space optical links can be supplemented with 40 GHz RF links to achieve near carrier class availability.
COBISS.SI-ID: 23243047
Multiple-input multiple-output (MIMO) technology is an efficient solution for providing higher data throughput and link reliability in wireless systems. In this paper a virtual MIMO system, based on constellation of multiple high-altitude platforms is proposed. HAPs provide a broadband wireless access to high-speed trains under predominantly line-of-sight propagation conditions. The performance of transmit diversity based on space–time block coding is investigated and compared to the reference receive diversity scheme based on best HAP selection.
COBISS.SI-ID: 23050279