Conventional and multiple trellis-coded 8-PSK modulations over EHF mobile satellite channels.

Abstract

The increasing demand of the frequency spectrum for land mobile satellite communication services has led to the approach of moving the current operating frequency up to EHF (30/20 GHz) band. In this thesis, the propagation characteristics of the EHF mobile satellite communication channel are estimated and modeled. Conventional and multiple trellis-coded modulation schemes designed for fading environment are considered for the EHF mobile satellite channel. The design criteria for optimum trellis-coded modulation scheme on the folding channel are studied. Through computer simulation, the performances of both coherent and differential trellis-coded modulation systems with selected coding schemes on the EHF channel models are evaluated. The effects of using channel state information and interleaving technique on the trellis-coded modulation systems are also studied. Finally the simulation results are presented and discussed.