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 25 for “"Propagation channel"”.
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Propagation channel models for 5G mobile networks. Simulation and measurements of 5G propagation channel models for indoor and outdoor environments covering both LOS and NLOS Scenarios
… next-generation cellular system, for which the propagation channel models need to be predicted to enhance the design guidance and the practicality of the whole design transceiver system. The present work addresses the main concepts of the propagation channel behaviour using ray tracing software …
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Implanted Antennas and Intra-Body Propagation Channel for Wireless Body Area Network
… challenges, such as frequency band selection, channel modeling, antenna design, physical layer (PHY) protocol design, medium access control (MAC) protocol design and power source. This research focuses on the design of implanted antennas, channel modeling between implanted devices and Wireless …
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Radio Wave Propagation Measurements and Modeling for Land Mobile Satellite Systems
… is conditioned by the characteristics of the propagation path between a satellite and mobile users. The most important propagation effect in land mobile satellite system is roadside attenuation of the signals due to vegetation or urban structures. System designers should have the most reliable …
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Multiple Antenna Terminals in Realistic Environments - A Composite Channel Modeling Approach
… wireless communication systems we need physical channel models that take into account also the directional domain of the propagation channel. In this thesis we investigate, validate and propose a practical approach to wireless channel modeling and, particularly, to mobile communication systems. …
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Feasibility Study and Performance Evaluation of Vehicle-to-Everything (V2X) Communications Applications
… notification time and distance. We conducted channel measurements at a 5.86–5.91-GHz frequency and 5.9-GHz DSRC performance measurements at railroad crossings in open spaces, shadowed environments, and rural and suburban environments related to the presented V2T architecture. Our measurements …
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A Propagation Simulator for Land Mobile Satellite Communications
… communications link can be determined by the propagation path between a satellite and mobile users. Some of the most important factors are multipath propagation and vegetative shadowing. System designers should have the most reliable information about the statistics of fade duration in order …
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Wideband propagation measurements for personal communication systems
The propagation channel is a vital but invisible part of any wireless communications system. As wavelengths get shorter, multipath effects become more pronounced, causing small scale fading in narrowband channels, and inter-symbol interference in wideband systems because of delay spread in the …
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Indoor Propagation Modeling at 2.4 GHz for IEEE 802.11 Networks
… challenges. It is difficult to predict the propagation of a radio frequency wave in an indoor environment. To assist in deploying the above systems, characterization of the indoor radio propagation channel is essential. The contributions of this work are two-folds. First, in order to build a …
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Integral Identities for Passive Systems and Spherical Waves in Scattering and Antenna Problems
… and have been used recently to model antenna-channel interaction and multiple-input multiple-output (MIMO) communication systems. This thesis is also the first to present a method to estimate spherical wave coefficients from propagation channel measurements. The results of this thesis can …
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Differential MMSE: A New Approach for Adaptive Interference Suppression Over Time-Varying Channels
… phase variations typical of a wireless fading channel. A classical method for noncoherent communication over such channels is differential modulation and demodulation, which obviates the need to track amplitude and phase by exploiting the fact that channel variations over successive symbols are …
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Performance evaluation of a spread spectrum local area position location system
… limitation to position accuracy was found to be propagation channel induced errors. By employing nonlinear filtering methods combined with robust estimation techniques, position error distributions which exceed the performance of classic least squared error methods have been achieved. The …
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The Impact of Antenna and RF System Characteristics on MIMO System Capacity
… Recent research has shown that in multipath propagation environments, the spatial characteristics of the propagation channel can be exploited to increase spectral efficiency through the use of multiple antennas at the transmitting and receiving nodes. Such multiple-input multiple-output …
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Measurement Based Channel Characterization and Modeling for Vehicle-to-Vehicle Communications
… link, which rely upon the properties of the propagation channel. Therefore, understanding the properties of the propagation channel becomes extremely important. This thesis aims to fill some gaps of knowledge in V2V channel research by addressing four different topics. The first topic is …
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Design and performance of a flexible wavelet based multicarrier modulation for wireless communications
… of this new scheme over various wireless channels are reported and the differences with OFDM are highlighted whenever relevant. The issue of equalisation for WPM signal is extensively discussed and quantitative comparison with the extremely efficient cyclic based OFDM equalisation method …
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An air-coupled ultrasonic array scanning system for rapid through transmission NDT
… used to couple the ultrasonic signal through the propagation channel. The fundamental basis of the proposed approach is the removal of the water couplant, enabling a receiver array to be employed, and thus scan large areas more quickly. Flexibility would also be increased with this technique due …
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Secure communication through free-space channel using quantum illumination
… protocol has been demonstrated in a fiber channel. In this thesis, we extend the QI secure communication protocol to a free-space propagation channel. Unlike a fiber channel, a free-space channel is susceptible to air turbulence. Because a single spatial mode of light is essential in the QI …
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High Speed Turbo Tcm Ofdm For Uwb And Powerline System
… capturing multipath energy in highly dispersive channels and delivering high data rate transmission. One of UWB proposals in IEEE P802.15 WPAN project is to use multi-band OFDM system and punctured convolutional codes for UWB channels supporting data rate up to 480Mb/s. The HomePlug Networking …
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Latency Study and System Design Guidelines for Cooperative LTE-DSRC Vehicle-to-Everything (V2X) Communications including Smart Antenna
… of vehicles results in a highly variable propagation channel that complicates communication. Use of a smart, steerable antenna can be one solution. The most commonly used antennas for vehicular communication are omnidirectional. Such antennas have consistent performance over all angles in …
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Adaptive DS-CDMA multiuser detection for time variant frequency selective Rayleigh fading channel
… over time-variant frequency selective fading channels. In addition, channel acquisition and delay estimation techniques are developed to combat the uncertainty introduced by the wireless propagation channel. This work emphasizes fast and simple techniques that can meet practical needs for high …
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Performance evaluation of massive MIMO Systems for future wireless access systems
… An evaluation of the effect of the iii dominant propagation channel conditions was also done by evaluating the spectral efficiency performance of the four detection methods in correlated and uncorrelated channels. Lastly the effect of pilot contamination was investigated. The results showed that …
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