Browsing Master's Theses by Author "Uysal, Murat"
Now showing items 1-20 of 31
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Adaptive multiple-input multiple-output (MIMO) techniques for visible light communications
Visible Light Communication (VLC) technology is a promising solution of wireless communication systems in beyond 5G communication networks, which provides low implementation cost, high energy efficiency, and high-speed ... -
Adaptive OFDM-based acoustic underwater transmission: system design and experimental verification
Sadeghi, Mohammad (2017-08)In this study, we design and implement an adaptive Underwater Acoustic (UWA) orthogonal frequency division multiplexing (OFDM) system employing adaptive modulation and transmit power. Recently, UWA communications gain more ... -
Analysis and optimization of the network throughput in ieee 802.15.13 based visible light communication networks
In recent years, commercialization of visible light communication networks have started. As a result, there are multiple groups working for their standardization. In this work, we focus on one of them, which is IEEE 802.15 ... -
Channel modelling and characterization for visible light communications
Sarbazi, Elham (2014-08)Visible light communications (VLC) involve the dual use of illumination infrastructure (i.e., LEDs) for wireless communication purposes. Despite the growing academic and industrial interest, there is a lack of realistic ... -
Coded continuous phase modulation for tactical communications
Foruhandeh, Mahsa (2014-08)Satisfying the various demands of tactical transceivers is one the common challenges in military communications. Different modulation, coding and spread spectrum techniques are needed to meet these requirements. Although ... -
A compact circularly polarized monopulse slotted waveguide array for airborne applications
Nawaz, Wasim (2019-10-24)In modern radar and communication systems, high gain, high power capability and low-profile antenna systems are frequently utilized. In airborne and space borne applications, slotted waveguide antenna array is widely used ... -
A custom-design atmospheric channel emulator for the performance evaluation of free space optical communication systems
Kebapçı, Burak (2017-08)The properties of atmospheric chamber and measurement methods that are used in this system are explained and analyzed in detail. We present our own custom design atmospheric channel emulator for FSO system evaluations and ... -
Diversity techniques for ultraviolet communications
Ardakani, Maryam Haghighi (2016-08)Strong molecular and aerosol scattering in ultraviolet (UV) wavelengths enable mechanisms where transmitter can communicate with the receiver in the absence of line of sight (LOS) link. Recent advances in solid state ... -
Diversity-multiplexing tradeoff for network coded cooperative OFDMA systems
Heidarpour, Ali Reza (2016-08)Cooperative communication (CC) exploits the broadcasting nature of wireless transmission and creates a distributed multiple-input multiple-output (MIMO) system among the wireless nodes which are physically separated from ... -
Enhanced unipolar OFDM based relay-assisted visible light communications
Gerard, Djengomemgoto (2016-08)Due to spectrum scarcity of the conventional radio frequency (RF) and the higher demand for wireless services, visible light communication (VLC) has emerged as a complementary solution to RF technology for ubiquitous ... -
An experimental and numerical investigation of immersion cooled blue led combined with yag:ce phosphor for thermal, electrical and optical performance
At the new age of illumination, light emitting diodes (LEDs) have been proven to be the most efficient alternative to conventional light sources. Yet, in comparison to the other lighting systems, LEDs can withstand a lower ... -
Experimental investigation of pointing errors on drone-based FSO systems
Airborne free-space optical (FSO) communication links can be efficiently used for backhaul/fronthaul needs of future cellular networks. Unlike terrestrial FSO links where a fixed connection between two buildings is considered, ... -
FPGA implementation of OFDM based VLC
This thesis presents the Field Programmable Gate Array (FPGA) based implementation of Orthogonal Frequency Division Multiplexing (OFDM) for a Visible Light Communication (VLC) System. This happens to be the Single-Input ... -
HC-FFT : highly configurable and efficient FPGA ımplementation of FFT
Ergül, Pakize (2021-01-14)Fast Fourier Transform (FFT) is an efficient implementation of DFT. It is a ubiqui-tously used building block in a wide array of signal processing systems. In general-purpose applications such as spectral monitoring and ... -
Induction cooker design and experimental results with quasi resonant topology and jitter method
Tülü, Mehmet Emin (2012-08)This thesis presents an induction cooker design and its detailed experimental results. The design is based on Quasi Resonant Topology and is unique in terms of the particular Jitter Method it employs to drive the semiconductor ... -
Information theoretical performance analysis and optimization of underwater acoustic communication systems
Nouri, Hatef (2013-08)Underwater wireless communication is a rapidly growing field of research and engineering as its applications, which were once exclusively military, are extending into commercial fields. The need for underwater wireless ... -
Lighting design considerations and channel modeling for visible light communications
Safaraliev, Sadi (2019-06-10)There has been an extensive work on visible light communication (VLC) mainly due to scarcity in radio frequency (RF) spectrum and urgent need for a new wireless communication system in the near future. VLC considers the ... -
Multi-hop hybrid FSO/RF communication systems
Kazemi, Hossein (2014-08)The reliability of free-space optical (FSO) links is severely restricted by weather-dependent atmospheric phenomena including absorption, scattering and turbulence. An efficient solution is to build hybrid links where a ... -
Performance analysis and optimization of relay-assisted free space optical communication systems
Kashani, Mohammadreza Amini (2012-07)Free-space optical (FSO) communication has received an increasing attention in recent years with their ability to achieve ultra-high data rates (at the order of multiple gigabits per second) over unlicensed optical spectrum. ... -
Performance analysis of multi-relay free space optical communication systems
Mostaani, Zohreh (2015-01)Free space optical (FSO) communication has attracted a great attention in recent years because of their high bandwidth capacity in unregulated spectrum which makes them a cost-effective and easy-to-install alternative to ...
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