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Is the error rate for QPSK31 in a white noise channel worse than BPSK31?

I didn't see an apples-to-apples comparison in the PSK31 paper you linked to, and I don't know enough about the performance of FEC as a function of SNR to comment anyway. … Assuming for the sake of argument that FEC improves BER up to a certain point, then collapses (seems reasonable), you might see the behavior described in the PSK31 paper. …
Rodney Price's user avatar