I am building a communication system which uses light. For the system, I've buiult a custom analog circuit and connected it to LFRX with SMA-BNC-Alligator clip.
A simple dry run gives the following: As you can see, data is transmitted with on off keying. (Please ignore some ripples and fluctuation, it's due to 60 Hz fluorscent light interference. I'll fix it later.) I wonder that such input range (+- 50 mV) is quite acceptable for GNU Radio to manipulate. Since it's my first time to physically implement a communication system, I only have mathematical and theoretical knowledge, but have little experience and sense about dBm, rx sensitivity and so. But as I can see the waveform not so bad, I think I can manipulate it by equalizing or something... PS: In addition, that 60 Hz interference, would it be better if I filter out that at the analog circuit with high pass filter? Or is it just ok to use high pass filter block in GNU Radio. I think the former is better to reduce the computational cost of GNU Radio. And it is more proper to filter out before it passes through the ADC... Regards, Jeon.
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