HIGH-LEVEL TRELLIS-CODED MODULATION WITH SLOW FREQUENCY-HOPPING FOR LAND MOBILE COMMUNICATIONS

The use of high level modulation systems such as Trellis-coded 8-PSK a nd Trellis-coded 16-QAM, with slow frequency hopping, pilot symbol aid ed and small-sized interleaving techniques is proposed for land mobile communications. The bit error rate (BER) performance of those systems in the presence of additive white Gaussian noise (AWGN), cochannel in terference (CCI), and slow Rayleigh fading are evaluated by computer s imulation. Space diversity is applied to enhance the system performanc e. We show that by choosing optimum interleaving size and number of fr equency hopped (FH) channels, the proposed systems give considerable p erformance improvement and much less delay, especially in a slow fadin g environment.