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A Land mobile satellite service (LMSS) is an arm of mobile satellite system (MSS), in which a number of services are its subset. To ensure network availability, high quality of service (QoS), and reduce outage on the channel as a result of channel interferences during propagation, it is important to understand channel behaviour in various transmission environments. Vast literature has been published on the subject of channel models that attempted to improve on impairments in communication links: a large number has focused on narrowband channels than wideband. Due to advances in recent technology wideband modelling of satellite channels becomes necessary, which this research study is focused, particularly model for Land Mobile Satellite (LMS) channel. This study models the complete behaviour of LMS Channel based on the Lutz’s (1989) two-state statistical model but modified with two-state Markov chain for two different transmission environments, namely: shadowing (line-of-sight) and unshadowing (nonline-of-sight) conditions. In order to reduce the effect of channel outages, satellite diversity approach was employed in addition to the 2-state Markov chain. Simulations of these conditions were performed using MATLAB programming language. The study concludes that satellite diversity reduces outage on the channel, and when mobile terminals have access to two geostationary satellites simultaneously network availability is assured compared to when it has only one satellite link. .

Modelling of Land Mobile Satellite Channel to Counter Channel Outage