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Fbmc Çok Taşıyıcılı Kablosuz Haberleşme Sistemlerinde Zaman ve Frekans Kaymalarının Performansa Etkisi

dc.contributor.advisorAktaş, Emre
dc.contributor.authorAlavanda, Elif
dc.date.accessioned2018-09-13T06:58:04Z
dc.date.available2018-09-13T06:58:04Z
dc.date.issued2018-07-09
dc.date.submitted2018-06-11
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dc.identifier.urihttp://hdl.handle.net/11655/4877
dc.description.abstractMulticarrier systems are preferred today due to their robustness to the multipath effects and using fast fourier transform(FFT) easily to feasible and more efficient in many communication systems. Orthogonal Frequency Division Multiplexing (OFDM) system is a multicarrier system that allows a high speed broadband system is divided into lower speed signals at narrowband. In OFDM subcarriers are chosen orthogonal to each other pass through the flat fading channel improves the system performance. In many studies for next-generation communication systems, there is research on a system known as filter bank multicarrier (FBMC) which is an alternative to OFDM, uses faster fading signal shaping filters and more efficient because it does not use cyclic prefix. Many factors such as delay spread of the channel, doppler shift in wireless channels, the difference between receiver and transmitter oscillators cause inter symbol interefence (ISI) and intercarrier interference (ICI) and due to these interferences FBMC system performance also reduce as well as in OFDM system. The FBMC system is analyzed due to the its sensitivity to carrier frequency offset (CFO) and timing offset (TO) , which reduces its performance. In these analyses, Staggered Multitone Modulation(SMT) on the class of FBMC system that are based on quadrature amplitude modulation (OQAM) is used. The signal to interference ratio (SIR) is calculated without any of the assumption which are CFO and TO is so small in the system and the channel is flat fading. The results without assumption is analyzed in the small, medium and high delay spread areas. With this thesis, the changing in the power delay profile(PDP) of the channel is shown the effect on the FBMC system performance. Furthermore, in the AWGN channel , the performance of the OFDM and the FBMC system which are affected by the CFO and TO is observed due to the changing in the subcarrier number.tr_TR
dc.description.tableofcontentsÖZET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i ABSTRACT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii TEŞEKKÜR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v İÇİNDEKİLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi ÇİZELGELER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii ŞEKİLLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix SİMGELER VE KISALTMALAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii 1. GİRİS¸ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1. Tezin Amacı . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2. Tezin Kapsamı ve Akışı . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2. ÇOKLU TAŞIYICILI SİSTEMLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1. FBMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.1.1. CMT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.1.2. SMT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.1.3. FMT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 2.2. OFDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3. CFO VE TO’NUN FBMC/SMT PERFORMANSINA ETKİSİ . . . . . . . . . . . . . . . . . . 41 3.1. AWGN kanalda performans analizi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3.1.1. Kom¸su zaman ve frekans binlerinde zaman kayması olduğunda eşleştirilmiş süzgeç çıktılarının çıkarımı ( = 0, 6= 0, = 0 ) . . . . . . 43 3.1.2. Komşu zaman ve frekans binlerinde frekans ofseti varlığında eşleştirilmiş süzgeç çıktılarının çıkarımı ( 6= 0, = 0, = 0 ) . . . . . . 59 3.1.3. Komşu zaman ve frekans binlerinde zaman ve frekans ofseti varlığında eşleştirilmiş süzgeç çıktılarının çıkarımı ( 6= 0, 6= 0, 6= 0 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 3.2. Frekans seçmeli kanalda performans analizi . . . . . . . . . . . . . . . . . . . . . . . . . . 83 vi 3.2.1. Komşu zaman ve frekans binlerinde eşleştirilmiş süzgeç çıktılarının çıkarımı( = 0, 6= 0, = 0) . . . . . . . . . . . . . . . . . . . . . . . . . 85 3.2.2. Komşu zaman ve frekans binlerinde eşleştirilmiş süzgeç çıktılarının çıkarımı( 6= 0, = 0, = 0) . . . . . . . . . . . . . . . . . . . . . . . . . 96 3.2.3. Komşu zaman ve frekans binlerinde eşleştirilmiş süzgeç çıktılarının çıkarımı( 6= 0, 6= 0, 6= 0) . . . . . . . . . . . . . . . . . . . . . . . . . 107 4. KANAL MODELLERİ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 5. CFO VE TO’NUN OFDM PERFORMANSINA ETKİSİ . . . . . . . . . . . . . . . . . . . . . . . 122 5.1. AWGN kanalda performans analizi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 5.1.1. Komşu zaman ve frekans binlerinde eşleştirilmiş süzgeç çıktılarının çıkarımı ( 6= 0, 6= 0, 6= 0 ) . . . . . . . . . . . . . . . . . . . . . . . . 122 5.1.2. Komşu zaman ve frekans binlerinde eşleştirilmiş süzgeç çıktılarının çıkarımı ( = 0, 6= 0, = 0 ) . . . . . . . . . . . . . . . . . . . . . . . . 127 5.1.3. Komşu zaman ve frekans binlerinde eşleştirilmiş süzgeç çıktılarının çıkarımı ( 6= 0, = 0, = 0 ) . . . . . . . . . . . . . . . . . . . . . . . . 130 5.2. Frekans seçmeli kanalda performans analizi . . . . . . . . . . . . . . . . . . . . . . . . . . 132 6. NÜMERİK SONUÇLAR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 7. SONUÇ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 KAYNAKLAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 ÖZGEÇMİS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152tr_TR
dc.language.isoturtr_TR
dc.publisherFen Bilimleri Enstitüsütr_TR
dc.rightsinfo:eu-repo/semantics/openAccesstr_TR
dc.subjectfilter bank multicarrier
dc.subjectorthogonal frequency division multiplexing
dc.subjectcarrier frequency offset
dc.subjecttime offset
dc.subjectsignal to interference ratio
dc.titleFbmc Çok Taşıyıcılı Kablosuz Haberleşme Sistemlerinde Zaman ve Frekans Kaymalarının Performansa Etkisitr_TR
dc.typeinfo:eu-repo/semantics/masterThesistr_TR
dc.description.ozetGünümüzde bir çok haberleşme sisteminde, çok yollu etkilere kar¸sı daha dayanıklı ve hızlı Fourier dönüşümü (FFT) kullanımından dolayı uygulanabilirliği kolay ve daha verimli olan çok taşıyıcılı sistemler tercih edilmektedir. Dik Frekans Bölmeli Çoğullama (OFDM) sistemi, yüksek hızlı geni¸s bantlı bir sistemi her biri daha dar bir bandı kullanan, daha düşük hızda sinyallere bölünmesini sağlayan bir çok taşıyıcılı sistemdir. OFDM'de birbirine dik olarak seçilen alt taşıyıcıların düz sönümlenmeli kanallardan geçmesi performansı iyileştirir. Yeni nesil haberleşme sistemleri için bir çok çalışmada OFDM'e alternatif çok taşıyıcılı filtre bankası (FBMC) olarak bilinen, ön ek kullanmadığı için verimliliği daha yüksek ve daha hızlı sönümlenen sinyal şekillendirme filtreleri kullanılan bir sistem üzerinde araştırmalar olduğu görülür. Yayılım gecikmeleri, kablosuz kanallarda meydana gelen doppler kayması, alıcı ve verici osilatörleri arasındaki farklılık gibi bir çok etken OFDM sisteminde oldu˘gu gibi FBMC sistemlerinde de semboller arası girişim (ISI) ve taşıyıcılar arası girişim (ICI)'a neden olarak sistem performansını dü¸sürür. Bu tez çalı¸smasında, FBMC sistemi performansının dü¸smesine neden olan ta¸sıyıcı frekans ofseti (CFO) ve zaman kayması (TO) karşı hassasiyetine göre analiz edilmiştir. Bu analizlerde ofset dörtlü genlik kiplemesine (OQAM)'ne dayanan FBMC sistemi sınıfındaki aşamalı çok yönlü modülasyon (SMT) kullanılmıştır. Sistemde bulunan CFO, TO'nun çok küçük olduğu ve kanalın düz sönümlenmeli olduğu varsayımı yapılmadan oluşturulan sistem modelleri ile sinyal girişim oranı (SIR) hesaplamaları yapılmıştır. Varsayımlar yapmadan bulunan sonuçlar düşük, orta, yüksek gecikmeli yayılma ortamlarında incelenmiştir. Bu çalışma ile, kanalın güç gecikme profilindeki (PDP) de˘ gi¸simin FBMC sistem performansına etkisi gösterilmiştir. Ayrıca AWGN kanalda CFO, TO tarafından etkilenen OFDM ile FBMC sistemlerinin performansları alt taşıyıcı sayısındaki değişimlere göre gözlenmiştir.tr_TR
dc.contributor.departmentElektrik –Elektronik Mühendisliğitr_TR
dc.contributor.authorID10200059tr_TR


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