Browsing Tez Koleksiyonu by Title
Now showing items 1-20 of 31
-
2d CMUT array based ultrasonic micromanipulation of particles
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)The thesis introduces a concept of combining row column addressed CMUT arrays with microfluidic channel to enable trapping and two-dimensional manipulation of micro-particles. In this work a multilayer planar resonator ... -
5G challenges : Waveform design and D2D communication
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)Fifth generation (5G) of communication systems is expected to satisfy a wide variety of requirements with regards to different applications. Flexibility, low latency, low power consumption are the most important ones. Using ... -
Aerial platforms utilization for future networks
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)Challenges facing the next generation of communication systems include utilizing the wireless networks in the rural areas and disaster situations, as well as the requirements of high capacity services and connectivity ... -
Air-ground channel modeling and waveform containment
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)The content of this work is divided into two main parts. Part I is dedicated for characterizing Air-Ground channels. Applications using Air-Ground communications are expected to grow in the future. Low altitude phases of ... -
Altitude optimization of UAVS serving as base stations using deep learning
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2020)It is expected that unmanned aerial vehicles (UAVs) will play a vital role in future communication systems. Optimum positioning of UAVs, serving as base stations can be done through extensive measurements or ray tracing ... -
Compensation of mutual coupling in transmitting arrays of thin wire antennas
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)In the classical approach of antenna array theory, mutual coupling between elements is usually ignored. However, depending on the application, errors due to mutual coupling can be significant. This thesis presents a numerical ... -
A comprehensive survey on small object detection
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2021)The advancement in artificial intelligence and computer vision facilitates object detection for computer-based systems. Object detection is used in a wide spectrum of applications such as face detection, enforcement ... -
Deep learning based prediction of path loss values and distributions from satellite images
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2021)It is critical to provide rapid deployment of robust and effective outdoor communication systems in today's world, where many seek to provide wireless connection services from aerial grids of drones and balloons, or low ... -
Design of a digitally controlled ring oscillator for ADPLL
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2021)The digitally controlled oscillator is a commonly investigated circuitry due to its wide uses, especially in PLLs. This thesis proposes a digitally controlled ring oscillator with a sufficiently wide tuning range and fine ... -
Developing novel spectrum occupancy prediction and physical layer security techniques
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2020)Wireless communication systems have pervaded every aspect of our lives; from financial transactions to health records, from entertainment to work, from education to travelling. This extensive usage of wireless devices is ... -
Development of a wireless multichannel neural data transmission system
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)Implantable microelectrode arrays enable multichannel electrophysiological recordings from the mammalian brain during behavioral experiments. Wireless data transmission systems combined with the microelectrode arrays and ... -
Digital filter and analog LDO design for ADPLL in 180 nm CMOS technology
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2021)PLL is a control system built by elements that synchronize frequency and phase of a stable reference signal with an oscillator output signal. In 21st century, PLL is widely and essentially used in one's daily life in ... -
Directivity enhancement of 60 GHz microstrip patch antennas using dielectric fabry-perot resonantors
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2019)The 60 GHz frequency band offers many opportunities for innovations in the wireless network technology, unlike other bands. Since the wavelength in the 60 GHz band is millimetric, this band can suitably represent the ... -
Dynamic range enhancement in light field imaging systems
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2019)High dynamic range imaging has been an active research area in computational photography over the last two decades. The main reason is that the dynamic range of a traditional camera is typically less than the dynamic range ... -
Emulation techniques for small scale fading aspects of wireless channels by using reverberation chamber
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)Reverberation chambers (RVCs) are used to provide an effective and reliable testbed for emulating wireless channel effects in the laboratory environment. Various techniques that enrich the capabilities of the RVC in channel ... -
Extending light field camera capabilities
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)A traditional camera captures an image by projecting a scene on a two-dimensional image sensor plane regardless of the direction light rays coming onto the sensor. A light field camera, in contrast, records light rays in ... -
Extracting sub-exposure images from a single capture through fourier-based optical modulation
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)Through pixel-wise optical coding of images during exposure time, it is possible to extract sub-exposure images from a single capture. Such a capability can be used for different purposes, including high-speed imaging, ... -
FM band channel measurements and modelling
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2018)As the demand for higher data rates increases every day, the need for new frequency bands becomes more and more prominent. The FM band between 88 and 108 MHz is one of the bands that are not fully utilized. This band for ... -
A high-resolution time to digital converter design for all digital phase-locked loops
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2021)Phase-locked loops are one of the most significant modules that are used not only for communication circuits but also in other fields like biomedical and computer sciences. There are many types of PLLs such as Analog, ... -
Neural network-based adaptive myoelectric signal classification via utilization of entropy history
(İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)The surface electromyography (sEMG) signals emanating from the remnant forearm muscles of transradial amputees are eligible for controlling robotic prostheses to replace the functions of the lost hand. sEMG pattern recognition ...
