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Alat, Gökçen

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https://hdl.handle.net/20.500.12416/8965
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Bilgisayar Mühendisliği
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  • Thumbnail Image
    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
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    Master Thesis
    Performance of William's % retracement in banking and energy sectors
    (2002) Alat, Gökçen
    Günümüzün en yaygın yatırım araçlarından biri de hisse alım satımıdır. Yatırımcıların hisse alım-satımında, analiz yöntemleri etkin bir rol oynamaktadır. Bu tezde analiz methodlarından biri olan teknik analiz incelenmekte, bazı önemli gösterge ve grafik analizleri sunulmaktadır. Tezin asıl amacı William's %R göstergesinin her al ve sat denildiğinde 100 olaydan kaçının doğru tuttuğunu yüzde olarak hesaplamaktır. Örnek olarak en popüler ve market payı yüksek olan en büyük beş banka ile enerji hisselerinin tamamını içeren dört şirket seçilmiştir. Böylece göstergenin başarısı ile genelleme yapmak daha kolay olacaktır. Tezde göstergenin hesaplanışı ve grafik çizimi matematik tabanlı grafik çizicisi olan Matlab' da programı yazılmıştır.