Browsing Dept. of Electrical and Electronics Engineering - Ph.D. / Sc.D. by Title
Now showing items 113-132 of 136
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Repeated filtering in consecutive fractional Fourier domains
(Bilkent University, 1997)In the first part of this thesis, relationships between the fractional Fourier transformation and Fourier optical systems are analyzed to further elucidate the importance of this transformation in optics. Then in the ... -
Robust sampled-data control
(Bilkent University, 1995)Robust control of uncertain plants is a major area of interest in control theory. In this dissertation, robust stabilization of plants under various classes of structural perturbations using sampled-data controllers is ... -
Robustly and strongly stabilizing low order controller design for infinite dimensional systems
(Bilkent University, 2018-07)This thesis deals with the robust stabilization of in nite dimensional systems by stable and low order controllers. The close relation between the Nevanlinna-Pick interpolation problem and the robust stabilization is ... -
Secure multi-antenna transmission with finite-alphabet signaling
(Bilkent University, 2018-01)With the ever-growing demand for services that rely on transmission over wireless networks, a challenging issue is the security of the transmitted information. Due to its open nature, wireless communications is prone to ... -
Signal and detector randomization for multiuser and multichannel communication systems
(Bilkent University, 2013)Randomization can be considered as a possible approach to enhance error performance of communication systems subject to average power constraints. In the first part of this dissertation, we consider downlink of a multiuser ... -
Signal and image processing algorithms using interval convex programming and sparsity
(Bilkent University, 2012)In this thesis, signal and image processing algorithms based on sparsity and interval convex programming are developed for inverse problems. Inverse signal processing problems are solved by minimizing the ℓ1 norm or the ... -
Signal processing based solutions for holographic displays that use binary spatial light modulators
(Bilkent University, 2012)Holography is a promising method to realize satisfactory quality threedimensional (3D) video displays. Spatial light modulators (SLM) are used in holographic video displays. Usually SLMs with higher dynamic ranges are ... -
Signal representation and recovery under measurement constraints
(Bilkent University, 2012)We are concerned with a family of signal representation and recovery problems under various measurement restrictions. We focus on finding performance bounds for these problems where the aim is to reconstruct a signal ... -
Signaling games in networked systems
(Bilkent University, 2018-08)We investigate decentralized quadratic cheap talk and signaling game problems when the decision makers (an encoder and a decoder) have misaligned objective functions. We first extend the classical results of Crawford and ... -
Sparsity and convex programming in time-frequency processing
(Bilkent University, 2014-12)In this thesis sparsity and convex programming-based methods for timefrequency (TF) processing are developed. The proposed methods aim to obtain high resolution and cross-term free TF representations using sparsity and ... -
Spatial decoding of oscillatory neural activity for brain computer interfacing
(Bilkent University, 2013)Neuroprosthetics (NP) aim to restore communication between people with debilitating motor impairments and their environments. To provide such a communication channel, signal processing techniques converting neurophysio ... -
Stability and control of a compass gait model walking with series-elastic ankle actuation
(Bilkent University, 2017-12)Passive dynamic walking models are capable of capturing basic properties of walking behaviors and can generate stable human-like walking without any actuation on downhill surfaces. The passive compass gait model is among ... -
Structural analysis of pole assignment and stabilization in dynamic systems
(Bilkent University, 1989)Motivated by the need for qualitative investigation of general system properties such as controllability, obser\^bility, existence of fixed modes, etc. as the complement of the quantitative approach in analysis, ... -
Tailoring nonlinear temperature profile in laser-material processing
(Bilkent University, 2019-04)Ablation cooled material removal opened up great opportunities for understanding nonlinear processes. Especially using lasers as a tool to tailor nonlinear temperature gradient of material and engineering them to achieve ... -
Three-dimensional facial motion and structure estimation in video coding
(Bilkent University, 1994)We propose a novel formulation where 3-D global and local motion estimation and the adaptation of a generic wire-frame model to a particular speaker are considered simultaneously within an optical flow based framework ... -
Three-dimensional holographic video display systems using multiple spatial light modulators
(Bilkent University, 2011)Spatial light modulators (SLMs) are commonly used in electro-holographic display systems. Liquid crystal on silicon, liquid crystal, mirror-based, acousto-optic and optically addressed devices are some of the SLM types. ... -
Three-dimensional integral imaging based capture and display system using digital programmable Fresnel lenslet arrays
(Bilkent University, 2012)A Fresnel lenslet array pattern is written on a phase-only LCoS spatial light modulator device (SLM) to replace the regular analog lenslet array in a conventional integral imaging system. We theoretically analyze the ... -
Time-frequency component analyzer
(Bilkent University, 2003)In this thesis, a new algorithm, time–frequency component analyzer (TFCA), is proposed to analyze composite signals, whose components have compact time–frequency supports. Examples of this type of signals include biological, ... -
Transformation techniques from scalar wave fields to polarized optical fields for wide-viewing-angle holographic displays
(Bilkent University, 2018-07)Although the optical waves are vector-valued electromagnetic waves in nature, in holographic three-dimensional television (3DTV) research, an optical eld to be displayed is usually modeled as a scalar wave eld. In this ... -
Ultraviolet-visible nanophotonic devices
(Bilkent University, 2010)Recently in semiconductor market, III-Nitride materials and devices are of much interest due to their mechanical strength, radiation resistance, working in the spectrum from visible down to the deep ultraviolet region ...
