Thesis
Efficient designs for LiFi system
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2024
- Thesis identifier
- T17171
- Person Identifier (Local)
- 202054849
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- LiFi (short for light fidelity) is emerging as a complementary technology to the existing radio frequency (RF) telecommunication ecosystem. With the increasing data throughput and power consumption demands of new wireless RF standards, developing a LiFi physical layer that supports high data throughput (at least 10 Gbit/s) and energy-efficient transmission (less than 1 nJ/bit) is paramount. Designing a high-speed and power-efficient LiFi system necessitates considering both the transmission protocol and the optoelectronic front-end. The first part of the thesis addresses this by exploring the use of the Generalised Space Shift Keying (GSSK) technique for digital baseband modulation. However, to maintain stable communication under changing channel conditions, an adaptive GSSK algorithm is required, which includes beam selection and codebook adjustment based on instantaneous channel conditions. The thesis explores such algorithm and demonstrates that, depending on the use case, a transmission protocol based on adaptive GSSK can be used for high-speed and energy efficient LiFi transceiver design, even in mobile scenarios. To demonstrate the viability of adaptive GSSK for real system deployment, the thesis introduces a practical DSP implementation of an HDL-synthesizable adaptive GSSK algorithm for field-programmable gate arrays (FPGAs). Beyond modulation techniques, optoelectronic front-end elements can limit system performance. Custom receiver optics for high-speed photodiodes (PD) or PD arrays can enhance the LiFi transceiver’s performance. The thesis adopts freeform optics design methodology, typically used for far-field irradiance pattern generation, for receiver optics design, which can be tailored for specific scenarios such as an adaptive GSSK link. In summary, the thesis demonstrates how a high-speed, power-efficient LiFi system can be implemented using the proposed adaptive GSSK algorithm. The efficiency of such a system can be further enhanced by a freeform optical concentrator, which can be customised to suit the transmission technique. These contributions lay the foundation for a high-speed, power-efficient LiFi transceiver prototype.
- Advisor / supervisor
- Andonovic, Ivan
- Haas, Harald
- Michie, Craig
- Resource Type
- DOI
Relations
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PDF of thesis T17171 | 2024-12-18 | Public | Download |