Theses - Department of Electrical and Electronics Engineering
Faculty of Engineering
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Zone based GLRT for detecting physical random access channel signals in 5G
(Bilkent University, 2020-01)In LTE/5G systems, the random access channel (RACH) process occurs during the boot-up phase. As channel state information is not available at this stage, detecting several devices with high performance presents a challenging ... -
Optimal parameter encoding strategies for estimation theoretic secure communications
(Bilkent University, 2019-12)Physical layer security has gained a renewed interest with the advances in modern wireless communication technologies. In estimation theoretic security, secrecy levels are measured via estimation theoretic tools and ... -
Design and implementation of a general purpose median filter unit in VLSI
(Bilkent University, 1988-10)The median of a group, containing an odd number of elements, is defined as the middle element, when the elements of the group are sorted. A median filter finds the median of a number of elements at its inputs. Median filters ... -
Code design for interference channels
(Bilkent University, 2019-11)As the number of wireless devices dramatically increases, they experience more interference in their communications. As a result, managing interference in wireless networks is an important challenge in future wireless ... -
An analog neuromorphic classifier chip for ECG arrhythmia detection
(Bilkent University, 2019-10)Following Moore's Law, the increase in the availability of more processing power alongside the development of algorithms that can use this power, electrocardiogram (ECG) systems are now becoming a part of our daily lives. ... -
Non-uniformly sampled sequential data processing
(Bilkent University, 2019-09)We study classification and regression for variable length sequential data, which is either non-uniformly sampled or contains missing samples. In most sequential data processing studies, one considers data sequence is ... -
Effects of auditory attention on language representation across the human brain
(Bilkent University, 2019-09)Humans can effortlessly identify target auditory objects during natural listening and shift their focus between different targets. Unique allocation of brain resources would be inefficient for semantic search task. Here, ... -
Interactive real-time RF control for MRI transmit channels
(Bilkent University, 2019-09)Cardiac catheterization is one of the heavily researched areas of the real-time interventional studies in Magnetic Resonance Imaging (MRI), where elongated conductive wires are prone to excessive radiofrequency (RF) ... -
Automated image reconstruction for non-cartesian magnetic particle imaging
(Bilkent University, 2019-09)Magnetic particle imaging (MPI) is a high-contrast imaging modality that images the spatial distribution of superparamagnetic iron oxide (SPIO) nanoparticles by exploiting their nonlinear response. In MPI, image ... -
Electrically unbiased and half frequency driven waterborne 16×16-element 2-D phased array CMUT
(Bilkent University, 2019-09)Capacitive micromachined ultrasonic transducers (CMUT) are typically used as arrays consisting of separate cells or interconnected sub arrays, and these cells have several operation modes. Design procedure and ... -
Design and analysis of metamaterial based perfect absorbers
(Bilkent University, 2019-09)Subwavelength light absorbers have an enormous potential on applications such as photodetection, optoelectronics, solar cells and sensing. Scaling down the device dimensions provides artificial and advanced properties. ... -
Adaptive ambulance redeployment via multi-armed bandits
(Bilkent University, 2019-09)Emergency Medical Services (EMS) provide the necessary resources when there is a need for immediate medical attention and play a signi cant role in saving lives in the case of a life-threatening event. Therefore, it is ... -
Measuring and improving interpretability of word embeddings using lexical resources
(Bilkent University, 2019-08)As an ubiquitous method in natural language processing, word embeddings are extensively employed to map semantic properties of words into a dense vector representations. They have become increasingly popular due to their ... -
Personalizing treatments via contextual multi-armed bandits by identifying relevance
(Bilkent University, 2019-08)Personalized medicine offers specialized treatment options for individuals which is vital as every patient is different. One-size-fits-all approaches are often not effective and most patients require personalized care ... -
Hybrid and model based approaches for new BCI spellers
(Bilkent University, 2019-07)Electroencephalography (EEG) based brain-computer interfaces (BCIs), due to their non-invasive, portable and temporal resolution properties, are widely used in the field of neural engineering. In order to make BCI paradigms ... -
Stability of third order conewise linear systems
(Bilkent University, 2019-08)A conewise linear, time-invariant system is a piecewise linear system in which the state-space is a union of polyhedral cones. Each cone has its own dynamics so that a multi-modal system results. We focus our attention ... -
Design and development of an SSVEP based low cost, wearable, and wireless BCI system
(Bilkent University, 2019-08)It has become a challenging research topic to design and develop cheap and wearable brain-computer interface (BCI) systems but not compromising the performance. In this thesis, the design and development of a steady state ... -
Efficient parameter mapping for magnetic resonance imaging
(Bilkent University, 2019-08)Balanced steady-state free precession (bSSFP) is a magnetic resonance imaging (MRI) sequence that enables high signal-to-noise ratios in short scan times. However, it has elevated sensitivity to main eld inhomogeneity, ... -
Universally polarization-insensitive achromatic metasurfaces
(Bilkent University, 2019-07)Transparent optical components constitute the key elements of modern electro-optical systems including optical sensors, displays and imaging systems. The working principle of conventional transparent components rely on ... -
Iterative fitting approach to CR-MREPT
(Bilkent University, 2019-07)Electrical properties (conductivity, and permittivity, ) imaging, reveals information about the contrast between tissues. Magnetic Resonance Electrical Properties Tomography (MREPT) is one of the electrical properties ...
