A MISO UCA beamforming dimmable LED system for indoor positioning.

Area of Science:

• Optical Communications
• Wireless Networking
• Signal Processing

Background:

• Visible light communication (VLC) offers a promising alternative to traditional radio frequency communication.
• Accurate receiver positioning is crucial for many VLC applications.
• Existing LED transmitter arrangements can suffer from coverage gaps and signal interference.

Purpose of the Study:

• To propose a novel multiple input single output (MISO) transmit beamforming system for VLC.
• To enhance receiver position estimation accuracy using dimmable light-emitting arrays (LEAs).
• To optimize system performance and energy efficiency through strategic transmitter alignment and dimming control.

Main Methods:

• Implementation of a MISO beamforming system with dimmable LEAs arranged in a uniform circular array (UCA).
• Deployment of LED transmitters in a hexagonal lattice alignment to minimize coverage holes and radiation overlap.
• Utilization of pulse width modulation (PWM) for dimming control to achieve closed-loop beamforming and minimize energy consumption.

Main Results:

• Demonstrated high-performance visible light communication between transmitters and receivers (LED readers).
• Achieved accurate receiver position estimation, outperforming traditional rectangular grid alignments.
• Reduced coverage holes and overlapping radiation areas through hexagonal lattice deployment.

Conclusions:

• The proposed MISO beamforming system with hexagonal LEA alignment significantly improves VLC performance and position estimation accuracy.
• PWM-based dimming control enables optimal beamforming and energy efficiency.
• This technique provides a robust and efficient solution for advanced visible light communication systems.