Hi Sagnik,
right now, you can't build loops out of stream connections. That has causality reasons – if you had such a loop, and the "merging" block at the start of the loop would need input on both channels, GNU Radio couldn't guarantee your flow graph could ever start¹.
If you can live with a loosely–coupled feedback loop, message
passing would be an appropriate method: You can pass messages from
any block to any block without any restrictions - but also,
without backpressure. See chapter four or five of
http://tutorials.gnuradio.org . (If you haven't already, read the
tutorial from the start – I think it's rather nice!)
Best regards,
Marcus
¹ In fact, that restriction has historical reasons, and we know
we could remove it in some cases, but we didn't, so far. I used to
have an experimental branch where we didn't have that restriction,
but then a lot of our not-directly-stream-connection-related stuff
breaks; basically, a lot of algorithm in GNU Radio's internal data
handling depend on the Flow Graph being cycle-free.
I am using a GRC flowgraph for testing the energy detection algorithm for cognitive radio.I want to update my threshold for probability detection by estimating the SNR of the channel.
However, for this, I need a feedback loop, which I want to know how to implement.
Regards,
Sagnik Basu
B. Tech | 2013-2017
Dept. of Electronics and Communication
NIT Rourkela
M: 8337942928
_______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio