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dc.contributor.advisorNikolić, Zorica
dc.contributor.otherMilić, Dejan
dc.contributor.otherPerić, Zoran
dc.contributor.otherĐorđević, Goran T.
dc.contributor.otherSpalević, Petar
dc.creatorSmilić, Marko
dc.date.accessioned2021-09-29T11:01:34Z
dc.date.available2021-09-29T11:01:34Z
dc.date.issued2021-05-11
dc.identifier.urihttp://eteze.ni.ac.rs/application/showtheses?thesesId=8238
dc.identifier.urihttps://fedorani.ni.ac.rs/fedora/get/o:1735/bdef:Content/download
dc.identifier.urihttp://vbs.rs/scripts/cobiss?command=DISPLAY&base=70052&RID=39510025
dc.identifier.urihttps://nardus.mpn.gov.rs/handle/123456789/18547
dc.description.abstractThis dissertation considers adaptive transmission algorithms and their influence towards increasing information capacity and system reliability. Theses algorithms are applied to optical wireless communications, as well as to radio-frequency system with diversity receiver. System of adaptive transmission is described in detail, and different algorithms of adaptation are applied: ORA, OPRA, CIFR, and TIFR. Derived probability density function combines influence of atmospheric turbulence, atmospheric losses and positioning errors that consist of laser pointing precision and jitter. FSO system without adaptation is also considered. For this case, bit-error rate and outage probability are determined when signal is exposed to different strengths of atmospheric turbulence, when there is atmospheric attenuation and positioning errors due to both main causes, when IM/DD and heterodyne detection are used. Power penalty is also determined for such system. Bit-error rate is also determined for the case when SIM is used in combination with binary modulation and quadrature amplitude modulation. Capacity analysis is given for the use of ORA, OPRA, CIFR and TIFR adaptive transmission algorithms, and for IM/DD and heterodyne detection cases. Algorithms used for transmitter power adaptation are additionally analyzed and improved with an aim to obtain realistic and functional systems. Based on analytical expression, simulation model is developed for adaptive transmission systems, which is used to validate numerical results. Approximate expressions are also given for used adaptive algorithms. Finally, adaptive transmission is considered also for a class of wireless RF systems. Fading model used is based on α-κ-μ distribution. Outage probability and amount of fading are given as representative performance measures. Besides adaptive transmission algorithms used in FSO systems, analysis of space diversity reception is also presented for the general case of using L antennas.en
dc.formatapplication/pdf
dc.languagesr
dc.publisherУниверзитет у Нишу, Електронски факултетsr
dc.rightsopenAccessen
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.sourceУниверзитет у Нишуsr
dc.subjectBežične komunikacije u slobodnom prstoru, Malaga model atmosferske turbulencije, Algoritmi adaptivnog prenosa, Kapacitet kanala, Verovatnoća otkaza, Verovatnoća greške po bitu, α-κ-μ model fedinga, Diverziti prijemniksr
dc.subjectFree Space Optics communication, Malaga model of atmospheric turbulence, Adaptive transmission algorithms, Channel capacity, Outage probability, Bit Error Eate Probability, α-κ-μ fading model, Diversity receiveren
dc.titlePovećanje informacionog kapaciteta i pouzdanosti u bežičnim optičkim komunikacijama primenom algoritama adaptivnog prenosasr
dc.typedoctoralThesis
dc.rights.licenseBY-NC-ND
dcterms.abstractНиколић, Зорица; Милић, Дејан; Спалевић, Петар; Ђорђевић, Горан Т.; Перић, Зоран; Смилић, Марко; Повећање информационог капацитета и поузданости у бежичним оптичким комуникацијама применом алгоритама адаптивног преноса; Повећање информационог капацитета и поузданости у бежичним оптичким комуникацијама применом алгоритама адаптивног преноса;
dc.identifier.fulltexthttps://nardus.mpn.gov.rs/bitstream/id/76361/Doctoral_thesis_11455.pdf
dc.identifier.fulltexthttps://nardus.mpn.gov.rs/bitstream/id/76360/Smilic_Marko_M.pdf
dc.identifier.rcubhttps://hdl.handle.net/21.15107/rcub_nardus_18547


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