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Visible Light Communication Measurement

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Asphandyar Ali

New Member
Hello, my thesis is based on providing mobility to a Lifi user in a room using LED transmitters. I will be adjusting the distance between LEDs to give a continuous pattern in a specific room so there's no void space left between the signal lobes. For that I need to physically move the detector under a transmitting LED to check 'Signal Strength'. The photodetector (receiver) is connected with Channel 1 of the oscilloscope, what do I measure to determine signal strength including point of disconnection, using oscilloscope?

Hint: I have measure dc levels and form a tabular data!
 

Asphandyar Ali

New Member
Its a simple test to determine signal strength received from the LED. I want to know what parameters should I note down during the test that show the strength of signal at different angles of the LED.
 

Asphandyar Ali

New Member
The important question is how do I determine the signal strength on an oscilloscope? I am getting a thick ugly sinusoidal wave there and I know I gotta check the DC levels but I am not sure about the intervals. I expected to take one reading for one location of the detector.
 

Tony Stewart

Well-Known Member
Most Helpful Member
It is not so simple to get the LiFi data rates of 10Mbps with a PD+TIA amplifier. not DC. But this is what is needed.
 
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Asphandyar Ali

New Member
Yes its not. My thesis is on providing mobility to the user in a specific room, not much worried about 10 Mbps, but I have a question! How do you determine its 10 Mbps? I provide 4 Mhz to the LED driver and it reflects on the oscilloscope!
 
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