Thesis
Wavelength division multiple access in LiFi networks
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2025
- Thesis identifier
- T17215
- Person Identifier (Local)
- 202054679
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- This thesis is focused on an indoor Light Fidelity (LiFi) network with a high amount of closely deployed Red-Green-Blue-Amber (RGBA) Access Point (AP)s and mobile users. The contributions made are threefold. Firstly, the impact of the Passband Shift (PS) effect is discussed in such a context, along with the challenges it entails. A generic system model is presented, including geometrical details, and the Probability Density Function (PDF) of the central wavelength of a shifted optical filter spectrum is presented, which is dependent on user mobility behaviour. Based on this, a new parameter (the Spectral Overlap (SO)) that can facilitate system design choices is formally introduced, and an investigation on the benets of optimising the Optical Front-End (OFE) for networked Visible Light Communication (VLC) with RGBA densely deployed APs is carried out. Secondly, a novel resource allocation scheme based on WD! (WD!) that can be used in the context of LiFi, called adaptive Wavelength Division Multiple Access (WDMA), is proposed. It allocates resources in a way that adapts to users' mobility behaviours by leveraging the PS effect and spatial separation while maintaining underlying compatibility with smart lighting solutions. By means of custom-written simulations, this scheme is tested against a fixed benchmark, showing improved fairness in the allocation as well as lower Connection Loss (CL) probability. Thirdly, this scheme is evolved into its "adaptive Wavelength Division Multiple Access-Multiple Input Multiple Output (WDMA-MIMO)" version to achieve better utilisation of available network resources even in lowly crowded scenarios. It is then tested against fixed benchmark in the context of increasing network crowdedness and considered in terms of handover rate. In terms of achievable data rate (both network and per-user), average Signal-to Interference-plus-Noise Ratio (SINR) in active channels, and CL, the fixed benchmark is always outperformed by the proposed scheme.
- Advisor / supervisor
- Andonovic, Ivan
- Resource Type
- DOI
Relations
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PDF of Thesis T17215 | 2025-03-04 | Public | Download |