[Discuss-gnuradio] About threshold value in digital_correlate_access_code_bb in gr-digital

[Songsong Gee]

I got a question about threshold value in digital_correlate_access_code_bb in gr-digital while testing benchmark_xx.py

threshold is set to 12 by default,

However, if I use threshold=12, it never calls callback function

Thus, I changed this value with larger value, like 24, 36, 64...

And then callback function is invoked, but not successfully (means, ok = False, not True is printed by benchmark_rx.py)

I think this threshold is a kind of a tolerance value when a system extracts data from a signal (packet)

So, Does it permit up to (threshold) wrong bits out of a length of access code, or a length of a packet?

Therefore, the lower threshold means the lower tolerance, is that right?

The question is,

if a recovered data has lots of wrong bits than this tolerance,

What things happen so that it cannot invoke callback function?

Of course, I can invoke the callback by modifying threshold,

but it also causes the unsuccessful packet reception.

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Seokseong Jeon, PhD Candidate

Communication & Networks Lab

IT Convergence Engineering (ITCE), POSTECH, Korea

+82 10 8338 1229, gee.songsong at gmail . com