Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/15956

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2004 - 200912010 - 20111

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COAR Access Rights: search.filters.coarAccessRights.metadata only accessDepartment: search.filters.department.Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Elektronik ve Haberleşme Mühendisliği Bölümü

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  • Master Thesis
    Dwdm technology and ason
    (2011) Karakoç, Ceyda
    DWDM (Dense Wavelength Division Multiplexing) system which is the main point for telecommunication networks; evolved rapidly day by day. In this thesis, DWDM systems are analysing with new technologies and also evaluating some parameters like dispersion parameter with real measurements.
  • Master Thesis
    Performance analysis of detection techniques in direct sequence code division multiple access (DS-CDMA) communication systems
    (2004) Alat, Gökçen
    DS-CDMA is a new technology providing significant progress in wireless communication. Each user is distinguished by a unique spreading code to modulate an information signal. There are two factors limiting a DS- CDMA system: channel noise which is modelled as an additive white Gaussian noise and multiple access interference due to the many user simultaneously sharing the system. Generally, there are three different methods in the detection of user's signal: the single user detection technique, the optimal detection technique and the suboptimal detection technique. m In previous works, conventional detector and the suboptimal multiuser detection techniques are compared using Gold sequence which is produced from the pseudo noise code sequence. In this thesis, conventional single user detection technique is compared against the decorrelating detector and minimum mean square error (MMSE) based on suboptimal linear multiuser detection techniques. Three types of signature waveforms are used in this study: Gold sequence, small set of Kasami and the large set of Kasami. The small set of Kasami displays best BER performance. The large set of Kasami provides better performance than Gold sequence. Finally, in addition to frequently used Gold code sequence on the detection techniques, this thesis makes a comparison according to the usage of different code sequences that have lower cross correlation property