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Light Acquisition

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.

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Updated: May 3, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

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A MISO UCA beamforming dimmable LED system for indoor positioning.

Attaphongse Taparugssanagorn¹, Siwaruk Siwamogsatham², Carlos Pomalaza-Ráez³

¹Wireless Information Security and Eco-Electronics Research Unit/National Electronics and Computer Technology Center, Bangkok 12120, Thailand. attaphongse.taparugssanagorn@nectec.or.th.

Sensors (Basel, Switzerland)

|February 1, 2014

Summary

This study introduces a multiple input single output (MISO) beamforming system using dimmable light-emitting arrays (LEAs) for enhanced visible light communication and precise receiver positioning. A hexagonal LED transmitter layout improves accuracy over rectangular grids, optimizing energy consumption.

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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.