Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 72 for “"TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television"”.
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Impacts of higher-order dispersion coefficients and dispersion fluctuations on one-pump fiber optical parametric amplifier
Four-wave mixing (FWM) is a nonlinear effect in optical fiber which is useful for fiber optical parametric amplifiers (FOPA). The performance of FOPA i.e. parametric gain, amplification bandwidth, and saturation power are reliant on the efficiency of the FWM process. The random dispersion …
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Modeling and performance evaluation of free space optical link for ground-to-train communications
There is an increased demand for high-speed train (HSR) services. Consequently, onboard high-speed internet access needs increased as passengers travel to and from work. This sudden surge in demand introduced new challenges in delivering a seamless internet connection on-board fast-moving trains. …
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New methods of partial transmit sequence for reducing the high peak-to-average-power ratio with low complexity in the ofdm and f-ofdm systems
The orthogonal frequency division multiplexing system (OFDM) is one of the most important components for the multicarrier waveform design in the wireless communication standards. Consequently, the OFDM system has been adopted by many high-speed wireless standards. However, the high peak-to-average- …
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Joint routing protocol and image compression algorithm for prolonging node lifetime in wireless sensor network
Wireless sensor network (WSN) are among the emerging modern technologies, with a vast range of application in different areas. However, the current WSNs technology faces a key challenge in terms of node lifetime and network connectivity due to limited power resource of the node. The conventional …
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Modulation techniques for GPR system radargram
Ground Penetrating Radar (GPR) system ability to detect embedded object underground is dependent on the ultra-wideband antenna use. Based on this antenna type, the fractional bandwidth used by the GPR system is usually greater or equal to 1. On the other hand, the GPR system using fractional …
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Development of wideband phased array antenna
… which has range between 3GHz to 9GHz at the radio frequency (RF) laboratory. Simulation result for wideband 4-8 GHz while the measurement result drops at 7.8 - 4.2 GHz, and the gain is 3.65 dB, and directivity 5.35 dBi. As well as the phase difference between the port 1 to port 2 is -154° and …
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Enchancing RFID data quality and reliability using approximate filtering techniques
Radio Frequency Identification (RFID) is an emerging auto-identification technology that uses radio waves to identify and track physical objects without the line of sight. While delivering significant improvements in various aspects, such as, stock management and inventory accuracy, there are …
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An improved negative selection algorithm based on the hybridization of cuckoo search and differential evolution for anomaly detection
The biological immune system (BIS) is characterized by networks of cells, tissues, and organs communicating and working in synchronization. It also has the ability to learn, recognize, and remember, thus providing the solid foundation for the development of Artificial Immune System (AIS). Since the …
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An intrusion detection system for DDoS flooding attacks on IPv6 networks using deep learning techniques
The news about distributed denial of service (DDoS) attacks is rapidly increased around the world. Many services of companies and/or governments are victims of the attack. The main purpose of DDoS attacks is to overload the service for a long time, rather than to steal money or data from the …
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Substrate integrated waveguide microwave antenna and filter design using H-fractal unit cell
Currently, the fifth generation (5G) technology has been assigned for microwave. There are several challenges in developing antennas and filters for 5G devices that need to be addressed such as low efficiency and large size at the lower proposed 5G frequency band (1 GHz -6 GHz). Hence, a compact …
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Pattern reconfigurable metamaterial antenna for 5G base station network
Reconfiguration of an antenna’s radiation pattern in a predefined direction is very important for enhancing the performance of communication systems in terms of the quality of service, system security, avoiding interference, and economizing power. Metamaterials, on the other hand, are commonly used …
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Cloud Computing based Learning Management System (CC-LMS) implementation model in Malaysia Higher Education Institutions
In the education arena, cloud computing is more apparent in technology to ensure the availability and sharing of resources through virtualization. Despite its attractiveness and benefits, the Higher Education Institution (HEIs) are still hesitant to implement cloud computing services due to …
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Multi slot amplitude coding technique for high speed optical fiber communication system
The rapid progress of the high speed optical communications system is driven by the exponential growth of users demand on information and services. The trend towards high speed and high capacity transmission system are multiplexing technique such as electrical time division multiplexing (ETDM) and …
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Building a family ontology to meet consistency criteria
Semantic web is an extension of the current web in which the existing information on the web are organized and encoded more meaningfully using ontology language, thus enabling effective communication among machines and humans. Ontology is the backbone of the semantic web that contributes to …
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Analysis of electromyograph (EMG) for controlling wheelchair motion
Nowadays, due to the aging of the current population, the need of wheelchair has significantly increased not only to the disabled community but also to the old citizen. However, the use of manual wheelchair is restricted to the user with leg impairment only. Yet, for the user with severe impairment …
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An implementation of peak to average power ratio reduction for multicarrier system (orthogonal frequency division multiplexing)
Orthogonal frequency division multiplexing (OFDM) has been becoming more popular modulation technique in the high-speed wireless communication system. It is used especially in Large Term Evaluation technique (LTE) which depended from the fourth-generation (4G) of wireless communication system. OFDM …
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A concept for wildlife tracking using ultra high frequency (UHF) radio
… of small animals or big animals. Normally, a radio tracking using a low frequency between 30MHz to 300MHz known as Very High Frequency (VHF). In this study, a band of Ultra High Frequency (UHF) with a frequency 315MHz is used as a transmitter. While a encoder HT12E is used as a function of …
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Optimization of supply chain management by simulation based RFID with XBEE Network
… the widely used technology in recent years is Radio Frequency Identification (RFID). It is an advanced Auto-ID wireless network based configuration system used for identification and tracking of items movement data. Technically, basic requirements for deploying RFID network are to identify the …
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A modified technique in RFID networking planning and optimization
Radio Frequency Identification (RFID) system is acknowledged as a mature technology often deployed in large scale tracking applications. Implementation issues like cost and effectiveness necessitated research on RFID Network Planning (RNP). The solution typically inspired by nature includes the use …
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Optimization of coded signals based on wavelet neural network
… compression technique is used in many modern radar signal processing systems to achieve the range accuracy and resolution of a narrow pulse while retaining the detection capability of a long pulse. It is important for improving range resolution for target. Matched filtering of binary phase …
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