LED Selection and MAP Detection for Generalized LED Index Modulation

LED Life Versus LED System Life

The useful life of an LED is presently determined by the IESNA LM80-08 lumen maintenance standard. Even though an LED system has many components, the current industry practice rates LED system lifetime based on a single component, namely, the LED. LED system life is one of the least understood parameters, especially in application environments. As a result, any lifetime claim for a complete LED...

LED-LED portable oxygen gas sensor.

A portable instrument for oxygen determination, based on the quenching of phosphorescent octaethylporphyrin by gaseous O(2), has been developed using the fluorimetric paired emitter-detector diode technique (FPEDD). The instrument configuration consists of two light-emitting diodes (LEDs) facing each other, with an interchangeable support containing a phosphorescent membrane in between, in whic...

LED-ID Systems Applying the Modulation and Coding Selection Scheme Based on Received Angle

This paper proposed the Modulation and Coding Selection (MCS) scheme according to the received angle in LED-ID optical wireless system. If location of LED-ID receiver is different, the optical power of received signal is different due to the received angle in LED-ID system. Therefore, system performance varies as the receiving angle changes, affecting the stability of the whole system. In the i...

LED Modulation Characteristics in a Visible-Light Communication System

This paper conducts a research on modulation characteristics of blue light-emitting diodes (LEDs) used in a visible-light communication (VLC) system. Through analysis of the modulation characteristics of LEDs with different emitting sizes, we find that there is a similar linear relationship between LED’s 3dB bandwidth and the operation current density. This experiment also shows that high serie...

Approaches to Sex Education: Peer-Led or Teacher-Led?