The synergy between frequency and phase modulation (FPM) using trellis-code
d modulation (TCM) leads to greater gains than can be achieved using conven
tional TCM/MPSK modulation. An iterative structure is introduced into a TCM
/FPM scheme to give a new scheme, the turbo TCM/FPM scheme. Simulation resu
lts show that the new scheme can achieve a significant performance improvem
ent with respect to the turbo TCM BPSK and TCM/FPM schemes, respectively, f
or a DS/SSMA system over a multipath Rician fading channel.