Measurement and Modeling of D2D Propagation Channels at Terahertz and Millimeter-wave bands in Workstation and Workbench Environments.
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Jha, Sahaj Kumar
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Abstract
Propagation channel measurements and modeling are required for proper design and efficient deployment of wireless communication systems. These channel models extract empirical parameters that help in statistical characterization of the propagation environment. Since any communication system is highly dependent on the propagating environment, it becomes necessary to study the channel in its environment of use.
The evolution of wireless communication has led to the connection of billions of devices and emergence of new(er) applications in remote sensing, localization, and ranging. These devices and applications will require significantly higher data throughput and lower latency. To support such high fidelity communication, there is a need for a reliable wireless architecture. However, the development of any such wireless systems requires a thorough study of scenario-specific channel models.
A large portion of the data traffic arising from the devices and applications would originate from indoor communication, especially in workstation and workbench environments. These environments are hotspots for network congestion because of the dense deployment of wireless multimedia devices communicating at these locations, such as laptops to monitors (for extended display), cell phones to projectors (for multimedia presentation), and other lab workbench equipment.
This thesis intends to provide a detailed characterization of a Device-to-Device (D2D) wireless propagation channel at Terahertz (THz) and Millimeter-wave (mm-wave) frequencies in the aforementioned environments. For the comprehensive characterization of the propagating channel, the experiments were performed in two environments:
1. Office Workstation Environment : The office workstation is unique in its structure and layout, with constituents such as computers, monitors, etc. serving as impediments to wireless propagation in this environment. Therefore, for the efficient deployment of D2D wireless systems operating at THz and mm-wave frequencies in this environment, a thorough characterization of Electromagnetic (EM) wave propagation in the aforementioned environment was performed. Large-scale parameters such as pathloss was found to be increasing with increasing frequency, i.e., higher at THz than mm-wave frequencies, while shadowing was larger in mm-wave than THz band. The spatial correlation values (computed after removing Line-of-Sight (LOS)) ranged between 0.13 and 0.34, indicating the sub-channels to be uncorrelated. Furthermore, the difference in capacity between LOS and Obstructed-Line-of-Sight (OLOS) was more pronounced in the THz band than at mm-wave frequencies.
2. Laboratory Workbench Environment : The workbench environment is replete with interacting objects that could act as obstructions and scatterers for wireless signal propagation. The pathloss was found to be severely affected by obstructions (around 66 dB in the experiments). The root-mean-squared (rms) delay spread was observed to decrease with increasing Transmitter (TX)-Receiver (RX) separation distance. The environment of study in this work is densely congested, in contrast to a sparse channel measurement. Therefore, the statistical channel model extracted from the channel parameters provided in this work will aid in realistic simulations for such environments.
There are very few works on scenario-specific channel measurement and modeling in these environments. A comprehensive channel measurement campaign and subsequent channel modeling have been provided in this thesis. Results presented in this study can be used by wireless system engineers working on sixth-generation (6G and beyond) applications to aid D2D wireless system design and implementation.
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2024-07-27
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