The degree of diversity and thereby the minimum Hamming distance (HD)
of a code is known to be the most important design parameter in a perf
ectly interleaved nonfrequency-selective slowly-fading channel. The co
ncatenation of an inner multilevel block modulation code with an outer
non-binary single parity check (SPC) code yields a doubling of the HD
. Simulation results for Rayleigh and Rician fading channels show cons
iderable coding gains compared to uncoded 4-PSK.