PERFORMANCE OF TRELLIS-CODED MODULATION SCHEMES ON SHADOWED MOBILE SATELLITE COMMUNICATION CHANNELS

The Canadian mobile satellite (MSAT) channel has been modeled as the s um of lognormal and Rayleigh components to represent foliage attenuati on and multipath fading, respectively. Several authors have applied tr ellis coded modulation (TCM) schemes to this channel, estimating the b it error performance via computer simulation. In this paper, analytica l expressions are derived for the pairwise error probability (PEP) of TCM schemes over this channel under ideal interleaving. The analysis i s applied to three detection strategies: ideal coherent detection, pil ot-tone aided detection, and differential detection. The results are s ubstantiated by means of computer simulation. In addition, first-order statistics of absolute and differential phases of a shadowed Rician p rocess are examined.