ECE-Theses-MSc

Permanent URI for this collectionhttps://iorep.miuegypt.edu.eg/handle/20.500.13071/11

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Design and Implementation of Wirless Sensor Network in a Distributed Control System for Emergency Response Notification /
Bekdash, Omar Mokhtar,; Supervisor : Hassan Ahmed El-Ghitani, Alaa Mahmoud Hamdy.
Today’s world is faced with many different types of emergencies in various types of environment. Response to such emergencies is critical to protect resources including human life. The research carries a study on how the wireless sensor network can solve problems that can be difficult and high risk for wired sensor network and how it beats the wired system on both time and cost matter. The research also carries a comparative study between different types of emergen cy communication systems and shows the most suitable system for each case depending on danger, cost and field used in. Furthermore, in this work, an emergency response system is proposed which is easy to deploy and can report the emergency to the users i n various forms, emergency response notification will be the preferred emergency system in the future. A design for an emergency response system is presented using temperature, level, and pressure sensors as a proof of concept. The automated system achieve s better performance than manual human response, it overcomes delayed informed danger, alarm priority and incorrectly estimating the type of danger or emergency.
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Design and Simulation of Antennas for Millimeter-Wave Communication Systems /
Elsebai, Mayar Raafat Wageeh Elsebai,; Supervisor : Fawzy Ibrahim, Hesham ElBadawy, Tamer Mostafa Abuelfadl.
Design an antenna in the Milli-Meter Wave (MMW) band could be a very hard task, the designing rules that are used in the designing process for the low band frequencies do not apply in case of high frequencies (from 30 GHz to 300 GHz) which is called Extremely High Frequency (EHF) band. The main objective of this thesis is to propose a technique that could make the designing process in MMW band much easier than before. The main idea of the proposed technique is designing new antennas based on a previously designed one called the reference antennas in order not to start from scratch every time a desired antenna is designed. This technique is applied and tested to design several antennas both single and dual band antenna designs. The utilization of proposed technique proved that it is fast, generic, easy and reliable one. For the single band designed antennas, four high performance antennas are designed and simulated based on this approach using IE3D simulation tool. The reference antenna operates at 77 GHz; its frequency is transformed to make the antennas operate at 35 GHz, 60 GHz, 94 GHz and 120 GHz for each design. For the dual band antennas, the reference antenna operates at dual band of 77 GHz and 98 GHz. Then by applying the same approach, three antennas are designed and simulated based on the previously designed reference one using CST Microwave Studio. The resulted desired first antenna works at dual band of 60 GHz and 77 GHz, the second one works at dual band of 77 GHz and 94 GHz and the last one works at dual band of 94 GHz and 120 GHz. Some modifications are applied to the mentioned technique and to the design in order to increase the limit of operation for the designed MMW dual band antenna and to make maximum benefits from the design without the need to design antennas from scratch; this was demonstrated by two examples, first antenna operate at 60 and 72 GHz while the second one operates at 90 and 117 GHz. I After proving the validity of this technique through this work; the designing process will be easier, especially the optimization step, which could be done also by applying this approach instead of tedious optimization based on the HF software packages.
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Design of Low Phase Noise RF Oscillators for Modern Wireless Communication Systems /
Abouyoussef, Mahmoud Samy,; Supervisor : Hassan El-Ghitani, Ayman M. El-Tager.
In this work, a low phase noise RF oscillator is designed, simulated and measured. The size of the designed oscillator is compact enough to be used in different applications. Moreover, it can be designed with low fabrication facilities. First, a novel quad spiral resonator is designed. Two resonator structures were introduced. One with a wide separation between the spirals, and another with a narrow gap. Parametric analyses were performed on many physical parameters of the two structures. Different orientations were simulated and compared with each other until the one that gives the best performance was chosen. Another parametric sweep is done on the minimum dimension length, width, and separation used. Each dimension gives a resonator with its own oscillation frequency that can be used according to the desired application. The proposed resonator is compared with other published work and shows a significant improvement in the Q factor of about 400. Second, a negative resistance method is utilized in designing two oscillators, including nonlinear Harmonic Balance simulation, EM-Circuit-Co-simulation. The active device used in the proposed oscillators is ATF-13786. A biasing network as well as an output circuit are designed and optimized for both oscillators. The first oscillator works at 14.4 GHz with a low phase noise of -125 dBc/Hz @ 1 MHz. It has an output power of 10.6 dBm. The second is a harmonic oscillator at 20 GHz. The active circuit is designed to oscillate at 10 GHz, but the output circuit is matched to the second harmonic. The circuit oscillates at 19.8 GHz with a low phase noise of -101 dBc/Hz @ 10 KHz The circuit has an output power -3 dBm. The two circuits are compared with other published work in the same frequency range. The advantage of low phase noise is achieved at the expense of the area.
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Performance Assessment for 5g Access Techniques /
Al-Masry, Ahmed Ali Fawzy,; Supervisor : Fawzy Ibrahim, Hesham ElBadawy
Nowadays, Non-Orthogonal Multiple Access (NOMA) has gained great attention due to its higher spectral efficiency (SE) over Orthogonal Multiple Access (OMA). NOMA can play a vital role in improving the capacity of future networks. Moreover, power domain NOMA multiplexes the users in power domain utilizing the Superposition Coding (SC) and allows them to access the whole spectrum simultaneously. Furthermore, at the receiver side Successive Interference Cancelation (SIC) is applied for signal detection. In this thesis, the Nakagami-m fading channel is more suitable to study the channel model. Therefore, the generation of the Nakagami-m fading channel represents the main contribution of this work. This is why the special Nakagami-m function will be generated. This thesis addresses two main channel models. First of all, the effect of conventional channel model on dual NOMA user (conventional NOMA system two users) is studied. This will be done to get complete modelling of the NOMA system. Secondly, the channel model is changed to be based on a statistical Nakagami-m generation function. The channel statistical model is used by taking into consideration the correlation coefficient matrix. Finally, the statistical channel model is deployed with multi user and perform the assessment technique. The obtained results show that the maximum efficiency that may be reached for conventional NOMA (two users NOMA) will occur at transmitted power of 25dBm. Whereas, by increasing the number of users up to sixteen users the maximum Energy Efficiency (EE) will be achieved at power level of 32dBm. Therefore, increasing more power the system will suffer from more interference, so that the obtained EE will be degraded.
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Performance evaluation of intelligent reflecting surface in heterogeneous wireless networks : (5G and beyond) /
El-Kholy, Enji Mamdouh Rashad Mahmoud,; Supervisor : Fawzy Ibrahim Abd El-Ghany, Mahmoud Mohamed El-Mesalawy, Mehaseb Ahmed Mehaseb. Includes Arabic Summary.
Simultaneous Wireless Information and Power Transfer (SWIPT) is recognized as a promising technique for addressing the energy constraints in wireless communication systems. Meanwhile, Intelligent Reflecting Surfaces (IRS) can customize wireless channels to enhance the spectral and energy efficiency of wireless communication systems. Integrating IRS into SWIPT systems can enable long-distance wireless communication with high data rates, device density, reliability, and energy endurance, particularly in the forthcoming Sixth Generation (6G) era. This thesis investigates a Multiple-Input Single-Output (MISO) IRS-assisted SWIPT system. This system involves a Base Station (BS) mounted on an Unmanned Aerial Vehicle (UAV) that concurrently sends information to Information Decoding Receivers (IDRs) and transfers energy to Energy Harvesting Receivers (EHRs). Unlike conventional SWIPT systems with fixed transmitters, UAV-mounted BSs offer flexible wireless service delivery to ground users. The main objective of the proposed system is to maximize the spectral efficiency of the IDRs by simultaneously optimizing the phase shifts of the reflecting elements at the IRS and the precoding vectors at the UAV. To achieve this, the thesis proposes the utilization of Dinkelbach’s algorithm, which allows the optimization of all the variables simultaneously with an acceptable complexity. MATLAB-based simulation results show that integrating the IRS into the SWIPT system enhances the spectral efficiency of IDRs by 60% and the energy efficiency of EHRs by almost 20 μW compared to the system without IRS. Furthermore, numerical analysis reveals that the proposed method significantly exceeds the performance of the AO-based SCA algorithm by approximately 78%

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Browsing ECE-Theses-MSc by Subject "Wireless Communication Systems"