I amĀ
transmitting and receiving from the same bladeRF board using a cable and a 20 dB attenuator.
If you see in the flowgraph I multiply by 0.3, that is specifically to prevent clipping and non-linearity.
I have tried using AGC or gain of low pass filter but no success.
The problem is that same flowgraph is working perfectly for BPSK and QPSK(most of the times), so I think issues with amplitude/clipping/non-linearity are ruled out.
However, when I move to 8PSK and QAM, I don't get demodulated output.
Any suggestions whether there are issues with flowgraph or is it some issue with hardware?