In version 3.7.7 GNU Radio added a 16QAM constellation object however there does not seem to be a receiver modem fine carrier tracking block that will handle 16QAM. The Costas loop block is only good for 2,4, and 8 PSK constellations. Do you know if any new fine carrier tracking blocks are planned? Has anyone implemented a GRC 16QAM receiver in any other way that you know of please?
Thanks very much, John R.