Re: [Discuss-gnuradio] QAM Modulation-Demodulation in Loopback

[Brian Padalino]

On Wed, Dec 4, 2013 at 5:46 AM, Kartik Seth <address@hidden> wrote:
> I had already done simulation for PSK as well as QAM in GNURadio and
> everything worked fine, even after using Channel Model block in between.
>
> When using with bladeRF in loopback the issues with 8PSK and QAM are coming.
> I can see the constellation in scope sink(if that gives any insight) but
> nothing is demodulated correctly. Moreover, once in a while data is
> demodulated(after many executions of same flowgraph).
>
> So  either there are some issues with Demod blocks or with the hardware
> (assuming flowgraph is correct).
>
> Has anyone tried this before and can confirm that this works?
> It would be helpful if someone can try this on their end and provide
> feedback.

If you put your flowgraph online somewhere that I can grab, I'd give it a shot.

Maybe push it up to github and send a link to that?

Given that you've tried it out with even the channel model between the
blocks, it's probably a configuration item or hardware misbehaving.

Brian