OOK Demodulation

GNU Radio
1

Hello,

I have recently been working on an OOK modulation and demodulation
block. I
am using GNU Radio 3.6.1. I achieved the OOK modulation by modifying the
digital_constellation.cc file and changing the constellation points to
(1+0j) and (0+0j). The modulation part works well, but I am having
trouble
with the demodulation. I am unable to demodulate the information that I
am
receiving. I was wondering if any one could tell me why this is
happening? I
would greatly appreciate any help or advice. Thank you for your time.

Sam

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2

For a general idea of how demodulation is done in gnuradio, take a look
at
how digital.clock_recovery_mm_ff() is used.

For an idea of how OOK threshold decision is made, grab datasheet for
SX1231 chip, and look at OOK demodulator section, which shows how peak
detection works (with diagram).

on-off-keying is generally regarded as not the first choice due to noise
susceptibility.
But i think it would be useful to experiment with it.