You can use the Chunks to Symbols block to define a custom
constellation. Here's an example for 64QAM:
https://github.com/argilo/gr-qam/blob/master/apps/qam64_b200.grc
For FSK, you can use the Frequency Mod block. You have to input a
correctly scaled float value for the shift you want. For multi-tone FSK,
use the Frequency Mod block in conjunction with the Chunks to Symbols block.
Ron
On 5/7/20 15:44, Roman A Sandler wrote:
Hi,
I am currently using `digital.generic_mod` with the included
modulation scheme from
https://www.gnuradio.org/doc/sphinx-3.7.1/digital/constellations.html
<https://signtr.website/click?redirect=https%3A%2F%2Fwww.gnuradio.org%2Fdoc%2Fsphinx-3.7.1%2Fdigital%2Fconstellations.html&dID=1588891460577&linkName=https://www.gnuradio.org/doc/sphinx-3.7.1/digital/constellations.html> (e.g. digital.constellation_8psk, digital.constellation_16qam,
etc...) as such:
```
digital_constellation_modulator = digital.generic_mod(
constellation=digital.constellation_bpsk().base(),
differential=False,
samples_per_symbol=sps,
pre_diff_code=True,
excess_bw=excess_bw,
verbose=False,
log=False)
```
However, I would like to use modulation schemes which are not included
in digital. I have two questions in that regard:
1) How can I define my own phase-amplitude type modulation schemes
such as 4PAM, 64QAM which are not included by default?
2) Can I use digital.generic_mod with FSK type modulations like GFSK?
If not how would I use them?
Thanks,
Roman
