Elektrik - Elektronik Mühendisliği Bölümü Koleksiyonu

Permanent URI for this collectionhttps://gcris.khas.edu.tr/handle/20.500.12469/47

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Browsing Elektrik - Elektronik Mühendisliği Bölümü Koleksiyonu by Publication Category "Kitap Bölümü - Uluslararası"

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    Book Part
    Analysis and Optimization of Matching Networks-I Getting Started With Ads
    (Springer-Verlag Berlin, 2008) Şengül, Metin Y.; Şengül, Metin
    [Abstract Not Available]
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    Book Part
    Analysis and Optimization of Matching Networks-Ii Getting Started With Microwave Office
    (Springer-Verlag Berlin, 2008) Şengül, Metin Y.; Şengül, Metin
    [Abstract Not Available]
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    Book Part
    Channel Modeling for Visible Light Communications
    (Springer-Verlag Berlin, 2016) Miramirkhani, Farshad; Panayırcı, Erdal; Uysal, Murat; Panayırcı, Erdal
    In this chapter, we present a novel and realistic channel modeling approach for visible light communications that overcomes the limitations of previous works. In our work, we consider wavelength dependency, effect of realistic light sources as well as different types of reflections such as specular and mixed cases of diffuse and specular. We use nonsequential ray tracing algorithms to calculate the detected power and path lengths from source to detector for each ray. These are then processed to yield the channel impulse responses for various indoor environments. We further present a channel characterization study where channel parameters such as channel DC gain, root mean square delay spread, coherence bandwidth, mean excess delay are calculated for different environments.
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    Book Part
    Minimum Length Scheduling for Discrete Rate Based Full Duplex Wireless Powered Communication Networks
    (Springer, 2019) Iqbal, Muhammad Shahid; Şadi, Yalçın; Şadı, Yalçın; Ergen, Sinem Coleri
    In this study, we consider a wireless powered communication network where multiple users with radio frequency energy harvesting capabilities communicate to a hybrid energy and information access point in full duplex mode. We characterize an optimization framework for minimum length scheduling to determine the optimal rate adaptation and transmission scheduling subject to energy causality and traffic demand constraints of the users considering discrete-rate transmission model. We first formulate the problem as a mixed integer nonlinear programming problem which is hard to solve for a global optimum in polynomial-time. Then, based on an analysis on the characteristics of the optimal solution, we derive optimality conditions for rate adaptation and scheduling using which we propose a fast polynomial-time complexity heuristic algorithm. We illustrate through numerical analysis that the proposed algorithm performs very close to optimal for various network scenarios.