Browsing Dept. of Electrical and Electronics Engineering - Ph.D. / Sc.D. by Title
Now showing items 113-132 of 146
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Performance analysis of the carrier-sense multiple access protocol for future generation wireless networks
(Bilkent University, 2013)Variants of the carrier-sense multiple access (CSMA) protocol has been employed in many communications protocols such as the IEEE 802.11 and Ethernet standards. CSMA based medium access control (MAC) mechanisms have been ... -
Performance evaluation of telecommunication networks based on multi-regime fluid queues
(Bilkent University, 2009)Today’s state-of-the-art search engines utilize the inverted index data structure for fast text retrieval on large document collections. To parallelize the retrieval process, the inverted index should be distributed among ... -
Performance modeling and analysis of the interplay among Tcp, active queue management and wireless link adaptation
(Bilkent University, 2015-09)We propose a novel workload-dependent queuing model of a wireless router link which employs active queue management and is offered with a number of persistent TCP flows. As opposed to existing work that focus only on the ... -
Performance of two-level forward error correction for lost cell recovery in ATM networks
(Bilkent University, 1995)The major source of errors in Asynchronous Transfer Mode (ATM.) networks is expected to be buffer overflow during congestion, resulting in cell losses. The large ratio of the end-to-end propagation time for a typical ... -
Phase-based techniques for image and video processing applications
(Bilkent University, 2018-01)In this thesis, phase information is utilized to address several issues in image processing applications; namely image quality assessment, image contrast enhancement, and visual object tracking. The classical two-dimensional ... -
Plasmonically enhanced hot electorn based optoelectronic devices
(Bilkent University, 2015-06)Hot electron based optoelectronic devices have been regarded as cost-e ective candidates to their conventional counterparts. The efficiency of conventional optoelectronic devices that rely on semiconductor photo-absorbers ... -
PLAWE: A piecewise linear circuit simulator using asymptotic waveform evaluation
(Bilkent University, 1994)A new circuit simulation program, PLAWE, is developed for the transient analysis of VLSI circuits. PLAWE uses Asymptotic Waveform Evaluation (AWE) technique, which is a new method to analyze linear(ized) circuits, and ... -
Polar codes for distributed source coding
(Bilkent University, 2014)Polar codes were invented by Arıkan as the first “capacity achieving” codes for binary-input discrete memoryless symmetric channels with low encoding and decoding complexity. The “polarization phenomenon”, which is the ... -
Power allocation strategies for channel switching and wireless localization
(Bilkent University, 2018-08)Optimal power allocation is an important approach for enhancing performance of both communication and localization systems. In this dissertation, optimal channel switching problems are investigated for average capacity ... -
Radiation impedance of capacitive micromachined ultrasonic transducers
(Bilkent University, 2010)Capacitive micromachined ultrasonic transducers (cMUTs) are used to transmit and receive ultrasonic signals. The device is constructed from circular membranes fabricated with surface micromachining technology. They have ... -
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 ...
