Did 3GPP define 512 QAM DL in LTE in any of the releases?
I think they did 1024 QAM.
oh… For Radio or Microwave?
I guess 1024 added for MW…
1024 QAM introduced in REl 15, but I do not remember definition for 512QAM.
Found this document of Qualcomm, they do not mention 512QAM at all.