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.
Results
Showing 1 to 20 of 89 for “"Path Loss"”.
-
Digital Terrain Models for Radio Path Loss Calculations
… digital terrain modelling for estimating radio path propagation within a mobile communication system. The ideal requirements are for a data structure which is storage efficient and computationally efficient for calculating profiles, whilst elevation errors should be constrained and radio path …
-
A Grid based Indoor Radiolocation Technique Based on Spatially Coherent Path Loss Model
… technique based on a Spatially Coherent Path Loss Model (SCPL). SCPL is a path loss model which characterizes the radio wave propagation in an environment by solely using Received Signal Strength (RSS) fingerprints. The propagation of the radio waves is characterized by uniformly dividing …
-
A Technique for Evaluating the Uncertainties in Path Loss Predictions Caused by Sparsely Sampled Terrain Data
… models provide an estimate of the power loss in a communication link caused by the surface of the ground, atmospheric refraction, foliage, and other environmental factors. Many of the models rely on digital topographic databases to provide information about the terrain, and generally the …
-
Analysis of Path Loss from a Transmitter in an Aircraft Cabin to an Exterior Fuselage-Mounted Antenna
… it is of interest to determine the "interference path loss" (IPL) from a transmitting device inside the cabin of such aircraft to the antenna terminals of a potential victim system of the aircraft. Past studies have concentrated on measurements. These efforts to measure IPL directly have …
-
Wideband Terrestrial Path Loss Measurement Results For Characterization of Pico-cell Radio Links at 38 GHz and 60 GHz Bands of Frequencies
… broadband wireless channels by measuring path loss statistics during different weather conditions. Hardware and software components of a wideband direct-sequence spread spectrum (DSS) channel sounding system, used extensively throughout measurement campaigns, are discussed in detail in …
-
A statistical ultra wideband indoor channel model and the effects of antenna directivity on multipath delay spread and path loss in ultra wideband indoor channels
… pairs. The effects of antenna directivity on path loss and multipath propagation in the channel were analyzed extensively for various omni-directional and directional antenna combinations. A statistical model of the path loss in the channel is presented, where the parameters in the model …
-
Automated Electronic Mode Stirring in Reverberant Cavities to Optimize Backscatter Link Margins
… by the deep nulls present due to dense multipath. With the round-trip path losses incurred by backscatter communication links, the system link budget is very sensitive to these nulls. Real-world applications require a strategy to mitigate this path loss actively in a wireless uplink, while …
-
Indoor Propagation Modeling at 2.4 GHz for IEEE 802.11 Networks
… out inside two different buildings. Then, path loss exponents from log-distance path loss model and standard deviations from log-normal shadowing, which statistically describe the path loss models for a different transmitter receiver separations and scenarios, are determined. The purpose of …
-
Validation of the ITU-R P series radio wave propagation model for millimetre wave V-Band (60GHz) line-of-sight point-to-point short distance link
… obtained confirm a strong correlation between path-loss and the impact of rain and atmospheric gases as predicted by the ITU path-loss model but also highlight a discrepancy. Further analysis revealed that rain duration appears to be having a detrimental effect on link performance. The …
-
Indoor wide band radio wave propagation measurements and models at 1.3 ghz and 4.0 ghz
… delay jitter, differential delay jitter, and path loss through analyses of impulse response estimates, which were obtained via repetitive 5 ns probing pulses. The effects of frequency, antenna height, topography (line-of-sight or obstructed direct path), and building environment on delay …
-
Design of an energy-efficient geographic routing protocol for mobile ad-hoc networks
… Ad-hoc networks and hence cope with dynamic path loss conditions, it is apparent that research and development of energy efficient geographic routing protocols is of great importance. Therefore various mobile Ad-hoc routing protocols have been studied for their different approaches. …
-
Improving the planning and deployment of wireless networks via the application of deep learning
… enhanced empirical model that utilizes extracted path loss components to expedite outdoor path loss predictions. Additionally, it presents the Path Loss Prediction Network (PPNet), a novel deep learning framework based on SegNet architecture aimed at refining radio propagation predictions. A …
-
Voice Call Capacity Over Wireless Mesh Networks
… the number of calls carried using packet loss and packet delay as metrics. We observe that, for one, two, three and four hop, 5.5 Mbps IEEE 802.11 wireless links have an upper-bound of eight, six, five, and three voice calls respectively. We then consider a carrier sensing range and a path …
-
Investigation of Indoor Propagation Algorithms for Localization Purposes: Simulation and Measurements of Indoor Propagation Algorithms for Localization Applications using Wall Correction Factors, Local Mean Power Estimation and Ray Tracing Validations
… mean power estimation, proposing new indoor path loss model and introducing a case study on 60 GHz propagation in indoor environments using ray tracing and measurements. A summary of propagation mechanisms and manifestations in the indoor environment is presented. This comprises the indoor …
-
Antenna effects on indoor wireless channels and a deterministic wide-band propagation model for in-building personal communication systems
… (CP) is more robust in combating multipath than linear polarization in line-of-sight channels. One objective of this thesis is to study the effects of antenna polarization and antenna pattern on multipath delay spread and path loss in indoor obstructed (OBS) wireless channels. A …
-
Propagation modeling for land mobile satellite communications
… and rural areas where fading occurs due to multipath effects and vegetative shadowing. A review of the literature was performed to study these propagation impairments. Available experimental data are examined, compared, and summarized. Propagation through vegetation is studied in order to compare …
-
Design and implementation of a methodology to characterize indoor visible light communication channels
… in the time domain and channel metrics such as path loss, RMS delay spread, coherence bandwidth, and maximum bitrate. Our method accurately estimates path loss, with a measured value of $15$ dB at $30$ cm transceiver distance, consistent with simulation results in the literature. However, our …
-
Communication in a Poisson field of interferers
… in a wireless environment; subject to path loss, shadowing, and multipath fading. We consider both cases of slow and fast-varying interferer positions. Under this scenario, we determine the statistical distribution of the cumulative interference at the output of a linear receiver, …
-
Integration of a genetic optimisation algorithm in a simulation framework for optimising femtocell networks.
… topologies. It estimates the throughput and path loss of all the femto and macro users for all the supported bandwidths of an LTE-A system using different modulation schemes. A series of tests are carried out using the described simulation framework for a range of scenarios. The modulation …
-
Remote Sensing-based Channel Modeling and Deployment Planning for Low-power Wireless Networks
… and Ranging (LiDAR) instruments, a specialized path loss model and evolutionary computation to identify (near-)optimal node position in forests, automatically and prior to the actual deployment. When low-power WSNs operating at 2.4 GHz are deployed in forests, the presence of trees greatly …
Page 1 of 5