Hi all,
I am implementing a fsk receiver and using clock_recovery_mm for
synchronization. The block was working fine till I lowered my data rate
to
50bps. I do not know what goes wrong for low data rates.
I am using 48k sampling rate and while working with 100bps I was having
480
samples per symbol (As i am implementing binary FSK so symbol rate= bit
rate ). When dealing with 50bps I changed the symbol rate => omega =
960
but the block was not giving the right output.
I dig into the block and found some strange things. I found that the
clock
recovery goes wrong when consecutive sequence (either 1 or 0) is input
to
it. The problem that i figured out by using the scope sink (in grc)
was with both the 100bps as well as 50 bps. But the 100 bps it was still
decoded by the binary slicer, however in case of 50 bps it was becoming
weird. Screen shots of for 100 bps ad 50 bps are attached. According to
our
understanding the highlighted portion is not correctly decoded.
–
*
Best Regards
Niaz A.*
NUCES-FAST, Islamabad Campus
EXT-369
Engineers motto: cheap, good, fast: choose any two (copied)