Trellis-coded DPSK for mobile fading channels

The error performances of the trellis-coded 8DPSK signals in Rayleigh fading channels are presented. The interrelationships between the bit error rate, the fade rate, the interleaving depth, and the decision depth of the decoder are examined. It is found that for fade rates between 0.01 and 0.03, one can safely choose an interleaving depth of 20 symbols and an interleaving span of 10 symbols to achieve about 10-dB fade margin at a 10/sup -3/ bit error rate. It is also found that the differential detection of PSK breaks down for fade rates greater than or equal to 0.06, due to the severe differential phase jitter introduced by the fading process.<>