Due to the 16QAM and 16APSK characteristic, is there exact comparison between 16QAM and 16APSK BER?

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    $\begingroup$ Why shouldn't there be? It's a bit unclear why you're asking this. BER is defined independent of the modulation scheme, so it's always possible to compare modulation schemes w.r.t. their BER under identical conditions (e.g. AWGN SNR). $\endgroup$ – Marcus Müller Dec 17 '19 at 19:44