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LED power consumption in joint illumination and communication system.

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Visible light communication (VLC) increases LED power consumption and heat due to signal modulation. This can lead to reduced light output and visible flicker, impacting joint illumination and communication systems.

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Area of Science:

Optoelectronics
Solid-state lighting
Optical communications

Background:

Visible light communication (VLC) systems integrate lighting and data transmission.
LED power consumption and luminous efficacy are critical parameters in VLC system design.
Signal modulation in VLC can affect LED performance and introduce undesirable effects like flicker.

Purpose of the Study:

To analyze the power penalty in illumination LEDs used for VLC.
To model the relationship between electrical power, luminous flux, and LED current.
To investigate the impact of modulation schemes on LED performance and identify potential issues.

Main Methods:

Modeling the convex relationship between dissipated electrical power and LED current.
Modeling the concave relationship between output luminous flux and LED current.
Analyzing LED luminous efficacy considering recombination mechanisms, current, and temperature dependencies.
Examining Pulse Amplitude Modulation (PAM) and Orthogonal Frequency Division Multiplexing (OFDM) for joint illumination and communication (JIC) systems.

Main Results:

Signal modulation decreases LED output light but increases total power consumption, leading to extra heating.
LED luminous efficacy is affected by recombination mechanisms and varies with current and temperature.
Rapid light fluctuations from modulation can cause visible flicker, especially with burst transmissions.

Conclusions:

VLC introduces a power penalty in illumination LEDs due to modulation-induced inefficiencies.
Understanding LED non-linearities and thermal effects is crucial for efficient JIC system design.
Mitigation strategies for flicker and power loss are necessary for practical VLC applications.