Routing and Wavelength Assignment Methods in WDM Optical Networks Based on Multi-Layer Graph Metrics

Wavelength Division Multiplexing (WDM) has been a widely-used multiplexing technique in large-scale optical telecommunication networks during the past few decades. Routing and Wavelength Assignment (RWA) is a fundamental process that involves determining the optimal path (routing) and assigning specific wavelengths to incoming data streams to...

Developing a Markov-Modulated Process Model for Mobility Processes

A major factor in the spreading of viruses is human-to-human transmission, and human mobility is clearly linked to the spreading process of epidemics. If we hope to understand the evolution of an epidemic, then we must also understand the underlying mobility process and the interaction between the two.<br/><br/>We propose the Markov modulated...

Design and Implementation of a Superconducting Phase-Shifter

Superconducting detectors such as Microwave Kinetic Inductance Detectors (MKIDs) have lead to the designs of THz on-chip spectrometers such as DESHIMA. With DESHIMA a wideband THz signal is fully sampled by several hundreds of channels of which the frequency is defined by an array of band-pass filters. Each band-pass filter which is connected to...

Advances in Graph Signal Processing: Fast graph construction & Node-adaptive graph signal reconstruction

This thesis consists of two parts in both data science and signal processing over graphs. In the first part of this thesis, we aim to solve the problem of graph construction in big data scenario, which is critical for practical tasks, like collaborative filtering in recommender systems, spectral embedding or clustering in learning algorithms. We...

IMS in 5G: Analysis of IMS based communication services in the 5G network

The thesis focuses on investigating the role of IP Multimedia Subsystem (IMS) in 5G networks. IMS already plays a very important role in enabling a wide range of real-time multimedia communication services such as basic phone calls and messaging in the LTE network. Addition of application servers on top of the IMS core can provide enhanced...

Measuring the robustness of network controllability

Networks are all around us, telecommunication networks, road transportation networks, and the Internet are a few examples of networks that we encounter every day. The entities in a network are represented by nodes and the interconnections between them are represented by links. For example, in a telecommunication network, a node could be an end...

SIS Epidemics on Network with Non-Markovian Curing Process

Susceptible-Infected-Susceptible (SIS) model is commonly used to describe the spreading of virus on networks. However, a real-life epidemic process is not necessarily Markovian. The spreading of diseases, behaviors and information in real systems are sometimes dependent on the characteristics and current status of individuals. Thus it is far...

Analysis of application-based traffic load balancing over satellite links of divergent performance

The main goal of the thesis is to investigate how to optimize Quality of Experience (QoE) of users using applications over satellite links by application aware load balancing capabilities of SD-WAN. SES (Commercial satellite operator) customers want to use applications over satellite links that have high latency and are often more congested than...

Performance Analysis of Google Congestion Control Algorithm for WebRTC

Web Real-Time communication (WebRTC) is a technology that enables web browsers to establish real-time communication services without the need of specific software or plug-ins. This technology is gaining popularity and is already supported by popular browsers such as Google Chrome, Firefox and Safari. The quality of real-time communication...

Modelling epidemic spreading phenomena processes on networks

Spreading processes are ubiquitous in nature and societies, e.g. spreading of diseases and computer virus, propagation of messages, and activation of neurons. Computer viruses cause an enormous economic loss. Moreover, many illnesses/diseases still causing a serious threat to public health. For example, the outbreaks of circulating influenza...

Feasibility Study on Optically Transparent Cylindrical Dielectric Resonator Antennas Integrated in an Enclosed Light Bulb Using Doppler Based Radar for Human Presence Detection

This thesis will focus on an 24 GHz indoor human presence detection radar with an optically transparent dielectric resonator antenna (DRA) applied in an enclosed light source. The DRA was studied extensively by simulations and measurements and demonstrated to suffer from blind spots for radar implementation because of the light bulb housing. To...

EM Interference Analysis of the Fly's Eye Antenna System in Stadium Scenarios

In this thesis the interference aspect of the Fly's Eye multi-beam antenna system of \cite{FlyEye}, a new base station concept to tackle the high data rate demands in spart stadiums is investigated. In particular the co-polar interference performance and the degree of multipath interference within the single spatial channel are considered. A...

Latency Analysis and Reduction in a 4G Network

5G, the next generation of mobile network, is expected to be launched commercially around 2020. Compared to the present generation – 4G mobile network, a significant improvement in terms of performance and reliability is considered for 5G. One of the important factor in the design of 5G is – about 10 times lower packet latency than 4G. Some of...

Evaluating the suitability of Narrowband Internet-of-Things (NB-IoT) for smart grids

Narrowband Internet-of-Things (NB-IoT), recently introduced by 3GPP, is a relevant Radio Access Technology (RAT) solution for deployment within smart grids, the electricity grids of the future, due to the need to provide low-cost connectivity to a large number of smart meters installed in households. Outage Restoration and Management (ORM), a...

Analysis of three dimensional array antenna elements to achieve asymmetric active element patterns

Typical antenna arrays are designed such that the active element pattern is symmetric around the broadside direction. However, applications exist, for example in satellite communication, where a symmetric pattern is not needed or even unwanted. This angular selectivity can be achieved using asymmetric elements. However, it is known that for well...