In this thesis it is investigated if it would be technically and economicallypossible to combine wind power and railway feeding. As a case studyBlekinge Kustbana (BKB), a railway section in the south of Sweden ischosen. The thesis includes an extensive power and energy flow analysison the railway section where large-scale wind power production is directlyconnected.When the work of this thesis started it was first of all a three sided convertersolution that should be studied. Where three-sided converter consists of aPWM-converter with the wind power connected to the DC-Iink. But duringthe work it was concluded that this solution is not the best solution for thecase. A better solution is the three-sided transformer, were the wind poweris connected through a third winding to the railway transformer on the 50Hzside.Also different railway feeding systems and their influence on how the windpower can be used are investigated.From the conclusions it can be mentioned that it would be profitable todirectly connect 4.5MW wind power to BKB. / <p>NR 20140805</p>

This thesis describes an approach for solving planning problems for a team of robots involving picking up and moving objects. The temporal goals are described using linear temporal logic over subsets of the workspace. Temporal logic is a convenient formalism to capture the usual control specications such as reachability and invariance as well as more complex specications like sequencing and obstacle avoidance. Those goals include the positions of the robots and the positions of the objects, e.g, go to a given location, bring an object there or pick up this object. We consider robots moving in a 2D environment which is partitioned into non-overlapping regions. A cost representing the total number of actions done by all the robots will be used to evaluate the quality of the runs. Our goal is to create a plan in a decentralized way for the robots that has a small cost and makes the robots collaborate to decrease the cost even more. The approach is divided in several steps. First a plan is created for each robot using an abstraction of the robot and its specication. This plan describes the sequence of abstract actions the robot will do to full its specifications. Second those actions are ordered in order to make their global cost as small as possible. Third and nally, the robot path for executing each action is found using automata theory. Such path is guaranteed to respect the global specication of the robot. We support the proposed theory with experimental results, showing that it gives an optimal solution in some simple examples.

In national security and public safety (NSPS) scenarios, the concept of device-to-device (D2D) clustering allows user equipment (UEs) to dynamically form clusters and thereby allows for local communication with partial or no cellular network assistance. We propose and evaluate a clustering approach to solve this problem in this thesis report. One of the key components of clustering is the selection of so called cluster head (CH) nodes that are responsible for the formation of clusters and act as a synchronization and radio resource management information source. In this thesis work we propose a weighted CH selection algorithm that takes into account UE capability, mobility and other information and aims at balancing between energy efficiency, discovery rate and cluster formation time. Numerical results show that the clustering approach consumes more energy but it can achieve a much higher discovery rate and communication rate for the system. Simulation results indicate that the weighted clustering approach is a viable alternative in NSPS situations.

With the dynamic changes in technological advancements, wireless communicationtechnologies has made a tremendous progress from simple to complex systems that are able tocommunicate across multiple networks platform. As these systems continue to prove theirproficiency and benefits, it is strongly asserted that wireless technologies will continue to play aneven more critical and vital role compared to wired connections in the future. The most relevant question now regarding the future of wireless technologies is whether it going todominate the wireline transmission or be a complementary to wireline where it’s difficult for anyreason to have wireline like wireless backhaul. With today’s wireless data rate speeds it would bedifficult to imagine it replacing wireline in the near future, but technically speaking it is feasible toachieve those data rates with use of wider spectrum. Moreover, wireless communication technologies particularly that of wireless mobile phonetechnology, is continuously more preferred in communication today, making it the first priority ofmodern day lifestyle. Modern communication system standards have therefore been subjected toevaluation and analysis to establish a more profound understanding of these various technologies.The proposed study presents an overview of various wireless communication systems such as:Global system for mobile communications (GSM), high-speed packet access (HSPA), long-termevolution (LTE), mobile WiMAX, ultra wideband (UWB) technology, ultra mobile broadband(UMB), wireless local area network (WLAN), Bluetooth wireless technology, and, Wi-Fi.

In this project, we investigate the performance of Raptor codes as candidatesfor channel coding for the wireless communication between access nodes.Very high data-rates are used, and processing uses more resources than transmission.Therefore, we need fast encoding and decoding algorithms for thechannel coding. Raptor codes have linear encoding and decoding times, andcan have very small overhead if they are properly designed. Hence, they arepossible candidates. We have implemented an encoding and decoding algorithm for Raptorcodes, as well as an environment for simulation. The system requirementsare expressed in terms of delay between the beginning of a transmission andthe successful decoding, and storage required during the transmission and processing.We have evaluated the performance of Raptor codes in terms of delayand storage as a function of system design parameters, in particular the numberof nodes in the network, and the size of the packets. We show that if thesize of the packets is properly chosen, Raptor codes can be useful for the application,and we explain the method for choosing the size of the packets. Wealso provide a way to calculate the delay and the storage for a given systemconfiguration, in order for example to determinate the larger number of nodesor the larger of users such that the delay and the storage are acceptable.

Professional Mobile Radio (PMR) also known as Private Mobile Radio or Land Mobile Radio (LMR) are radio systems conceived for public safety or professional event organizers. They are designed to provide a reliable and robust communication system independent from conventional public networks. In France, for instance, the national police is equipped with a PMR network, namely ACROPOL, that blankets the entire country and allows both voice and low data rate services. The object of this thesis is the North-American standard Project P25. It is a standard defined by the Telecommunications Industry Association (TIA) and is currently used by many radio communication systems in North-America. This report presents the results of a Matlab/C simulation designed to provide performances information on P25 physical layer. This knowledge is exploited to verify that the standard requirements are met. The final purpose of this thesis is the integration of Project 25 Layer 1 on a real radio platform. Thus, this report gauges the performances of all the modulators defined in the TIA standard for both Project 25 phase 1 and phase 2. Several tests are presented, they were realized in different conditions, that is with different channel models, propagation models as well as with or without any fading, in static and dynamic conditions. From this simulation, the Bit Error Rates vs Eb/N0 results have been extracted and are presented. The complete Forward Error Correction part has also been implemented and the correction capability of all the encoders and decoders has been verified, yielding the BER vs Eb/N0 plots. The resistance to an interferer has been evaluated, in several cases, with an interferer in the same channel or in an adjacent channel. The second part of this report presents the integration of the physical layer on a radio device. This was done to validate that both physical and MAC layers were compliant to the standard. This has been realized by interfacing the radio platform with Matlab via an Ethernet link and using UDP protocol.  Furthermore, at the end of the thesis some conclusions are drawn and future possible studies are detailed.

We have different kinds of signal processing everywhere around us in our everyday life, in our cellphones, when we are listening to music, watching TV etc. This makes signal processing a very interesting and important technical area, where the demand of skilled engineers sets the limit of what is possible. Working with signal processing requires in-depth knowledge in areas such as mathematics, physics, electronics, and other related areas. For this, it has traditionally been demanded by a talented developer to also master the advanced programming languages such as C / C + + and Assembler. This has begun to change; today there are several companies that offer graphical development environments for signal processing, environments where programming skills are not needed anymore, and the focus can be on signal processing instead. The goal with this project is to build a corresponding graphical development environment to reach an understanding of what is required of these systems, and also to grasp what opportunities that are available within graphic programming. Inspiration for the work has partly arise from some of the tools available on the market, and partly from previous theses that have been written about graphic programming. The challenge lies in creating a program that can execute signal diagrams in real time from given signal blocks, and be able to handle feedback loops in an efficient way and to do so at the lowest "cost" in terms of clock cycles as possible. This should also be compared against to code, compile and run a complete signal diagram directly. To increase the usability it should also be possibility to externally manage in real time the parameters of the signal diagram during execution. The interface is a separate program, which is to some extent similar to Matlab Simulink, where a signal diagram is drawn up graphically by connecting wires between different signal blocks. This signal scheme is then executed in an additional program that serves as a runtime environment. In this report, the term "signal engine" is used for this program. Signal engine is equivalent to the program that should have been run directly into a standalone DSP (Digital Signal Processor) if a more classic design had been selected, but now runs as a separate process in Windows.

In this master thesis, a sensorless system has been developed for an induction machine in railway applications. The approach which was taken in this master thesis is a consequence of the expectations of the company: investigate thepossibilities of having the current generation of Alstom's drive system working without use of a speed sensor. Some tests have thus been performed in order to validate parts of this statement. However, because of the substantial time that would require an exhaustive investigation and a complete development, from simulation to tests on a real train, it has been decided to focus more on selecting a method relevant for Alstom's specications, and simulate it in order to identify issues. Thus, from an extensive literature search based on books and articles considered as references, several methods has been investigated and one have been selected for simulation. Two set-ups were used for simulations; one developed in Matlab and the other one using real-time simulators used by Alstom to test and validate its hardware and control software. From these tests, it was showed that for an accurate control, it is necessary to estimate, jointly with the speed, main motor parameters. But these motor parameters can hardly be all estimated at the same time and a strategy in order to estimate eciently these other parameters is proposed. Issues related to a practical implementation are also investigated and some conclusions are drawn for an implementation of a sensorless system in an Alstom train.

For modern heavy-duty vehicles, improved fuel consumption is a necessity in order to cope with governmental demands and to stay ahead of competitors. This thesis examines how the fuel consumption can be reduced by controlling the auxiliary systems, such as the cooling system. All auxiliary systems are powered by the combustion engine and therefore reducing the power consumption of the auxiliaries would decrease the fuel consumption of the vehicle. The power consumption of the auxiliary devices is evaluated using recorded driving data for various vehicles and routes. It is shown that the consumption of the auxiliary systems depends on both vehicle and ambient variables, such as temperature and road topology. It is also concluded that controlled auxiliaries are beneficial for improved fuel consumption, but the drawback is decreased robustness. When the energy consumption of the auxiliaries is known, an optimal control problem for reducing the energy consumption of the cooling system is presented. With the road topology assumed to be known, the optimal velocity, the optimal gear choice with the possibility to use neutral gear with idling engine, as well as the optimal fan control are decided. Finally, the optimal control problem is solved for different scenarios and it is concluded that the cooling system influences both the optimal velocity and the optimal gear choice.

The Global Position System (GPS) has become nearly mandatory in our daily life,like the Internet. Since it (the part for civilian use) is free, open and accurate,lots of applications have made our life more convenient and more effective, suchas the location-based applications for cell phones, tracking bulldozers, shippingcontainers, etc. GPS is becoming mature and rather accurate, but its securitycan’t be neglected since it is widely used in the world. RF interference can beclassified into: intentional and unintentional interference. There are lots of RF inour surroundings, whose frequency might be close to GPS frequency, could affectthe GPS accuracy, or even sometimes make it unavailable. This project, I analyzetwo types interferences, spoofing and jamming interference. I implement two attacks:a version of Cicada attack, to check how this specific attack affects GPS, and thedistance-deceasing attack, a special type of a relay attack (Early Detect(ED) attackand Late Commit(LC) attack). I find (i) that the Cicada attack, as implemented,is essentially equivalent to jamming, and (ii) how to set up the ED/LC attacks tosucceed (i.e., have low BER).