Browsing Doctoral Degrees (Electronic Engineering) by Title
Now showing items 22-41 of 54
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Design and realization for radar cross section reduction of patch antennas using shorted stubs metamaterial absorbers
(2019)This thesis is devoted to analyzing of the Radar Cross Section (RCS) of rectangular patch antenna using Metamaterial Absorber (MMA) and the analysis of its reducing techniques. The addressed theme has a great complexity ... -
The Design of high-voltage planar transistors with specific reference to the collector region.
(1984)The thesis represents a major contribution to the understanding of the design and fabrication of high-voltage planar silicon bipolar transistors, and reports on the original research carried out and the special methods ... -
Determination of millimetric signal attenuation due to rain using rain rate and raindrop size distribution models for Southern Africa.
(2014)The advantages offered by Super High Frequency (SHF) and Extremely High Frequency (EHF) bands such as large bandwidth, small antenna size, and easy installation or deployment have motivated the interest of researchers to ... -
The development of an experimental, low profile, broadband travelling wave tube amplifier.
(1994)An experimental, field replaceable travelling wave tube (TWT) with low profile, TEM transitions has been developed with the aim of combining the cost advantages of field replaceable TWTs with the bandwidth advantages of ... -
A distributed framework for the control and cooperation of heterogeneous mobile robots in smart factories.
(2017)The present consumer market is driven by the mass customisation of products. Manufacturers are now challenged with the problem of not being able to capture market share and gain higher profits by producing large volumes ... -
Enhanced performance and efficiency schemes for generalised spatial modulation.
(2017)Abstract available in PDF file. -
Enhanced performance and efficiency schemes for generalised spatial modulation.
(2017)Generalised spatial modulation (GSM) is a relatively new multiple-input multiple-output (MIMO) technique, which conveys information via a spatial constellation, comprising groupings of active transmit antenna, and a ... -
Factors influencing the usage of web 2.0 tools in higher education.
(2019)The purpose of this study was to investigate the factors that influence the usage of Web 2.0 tools among academics in higher education in South Africa as well as the barriers that may arise when using these tools. Web 2.0 ... -
Hybrid token-CDMA MAC protocol for wireless networks.
(2009)Ad hoc networks are commonly known to implement IEEE 802.11 standard as their medium access control (MAC) protocol. It is well known that token passing MAC schemes outperform carrier-sense-multiple-access (CSMA) schemes, ... -
A MAC protocol for wireless networks with QoS guarantees.
(2002)Mobile communications are becoming integrated into society at an explosive rate. While 2nd generation (2G) systems limit the user to basic services such as voice and low-bit rate data, 3G networks are characterized by ... -
Mitigation techniques through spatial diversity combining and relay-assisted technology in a turbulence impaired and misaligned free space optical channel.
(2018)In recent times, spectrum resource scarcity in Radio Frequency (RF) systems is one of the biggest and prime issues in the area of wireless communications. Owing to the cost of spectrum, increase in the bandwidth allocation ... -
Modeling of raindrop size distribution and critical diameters for rainfall attenuation over microwave links in Southern Africa.
(2014)The inability of service providers to constantly meet the design target of 99.99 % availability of the line-of-sight (LOS) microwave links has caused concern among both the operators and consumers. The non-availability of ... -
Modelling and testing microwave magnetrons.
(1988)Though declining in popularity over the last decade, the magnetron still has applications where portable high power is needed. This study examines the predicted performance of cylindrical microwave magnetrons using ... -
Modelling of propagation path loss using adaptive hybrid artificial neural network approach for outdoor environments.
(2018)Prediction of signal power loss between transmitter and receiver with minimal error is an important issue in telecommunication network planning and optimization process. Some of the basic available conventional models in ... -
Multiple antenna systems : channel capacity and low-density parity-check codes.
(2005)The demand for high data rate wireless communication systems is evident today as indicated by the rapid growth in wireless subscribers and services. High data rate systems are bandwidth intensive but bandwidth is an expensive ... -
Multiscaling analysis and modelling of bursty impulsive noise in broadband power line communication channels.
(2017)Power line communication (PLC) networks have the potential to offer broadband application services to homes and small offices cheaply since no additional wiring is required for it implementation. However, like other ... -
Neural networks and early fast Doppler for prediction in meteor-burst communications systems.
(1994)In meteor-burst communications systems, the channel is bursty with a continuously fluctuating signal-to-noise ratio. Adaptive data rate systems attempt to use the channel more optimally by varying the bit rate. Current ... -
Non-binary compound codes based on single parity-check codes.
(2013)Shannon showed that the codes with random-like codeword weight distribution are capable of approaching the channel capacity. However, the random-like property can be achieved only in codes with long-length codewords. On ... -
Optimized digital signal processing algorithms applied to radio communications.
(1992)The application of digital signal processing to radio communications has come of age with the advent of low power, high speed microprocessors and over the past five years, various transceiver architectures, utilizing ... -
Packet scheduling in satellite LTE networks employing MIMO technology.
(2014)Rapid growth in the number of mobile users and ongoing demand for different types of telecommunication services from mobile networks, have driven the need for new technologies that provide high data rates and satisfy their ...