Distorted constellation

[Avishek-debbakshi]

In srsRAN with matlab i am currently doing that analyzers part (PUSCH) where i am getting distorted constellation even for QPSK and other modulation schemes to what are the changes to be done

[dvdgrgrtt]

Hi @Avishek-debbakshi,
I need some more context to help you - where are you getting the IQ samples from? Are you analyzing a PUSCH transmission that was received correctly (crc=OK) or one that wasn't, maybe with bad SNR? Please paste the relevant part of the logs.

Also, what do you mean by "distorted"? Recall that the analyzer shows the constellation after channel estimation and equalization, two processes that are not perfect and introduce errors, so even with high SNR, the constellation won't look perfect - I'm attaching an example I get with an SNR of around 30dB of a PUSCH that was received correctly.

[Avishek-debbakshi]

Yes now i figured it was due to low SINR