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Elektronik ve Haberleşme Mühendisliği Bölümü Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/179

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    Book Part
    Decoding of Polar Codes
    (Springer Science and Business Media B.V., 2019) Gazi, O.
    As we explained in Chap. 1, polar encoder structures can be constructed in a recursive manner. This leads to recursive decoding structures. In [1], Arıkan proposed successive cancellation decoding algorithm for the decoding of polar codes and derived recursive expression for the decoding operations. © Springer Nature Singapore Pte Ltd. 2019.
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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.
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    Conference Object
    Citation - Scopus: 4
    Nonuniform Currents Flowing on a Perfectly Conducting Cylinder
    (2011) Başdemir, H.D.
    In this paper, we applied physical theory of diffraction (PTD) method to the perfectly electric conducting (PEC) cylinder for investigation of the scattering fields. Physical optics (PO) method was used to gain the uniform scattering field which is produced by the induced current from the incident wave on the tangential plane of the perfectly electric conducting cylinder. Nonuniform current and scattered field will be obtained by applying PTD method to the problem. As a last step of solution, nonuniform currents and nonuniform scattering fields were obtained with the assistance of the exact solution of the scattering waves from the cylinder. The scattering fields and currents are plotted numerically. © 2011 IEEE.
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    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