Estimation of fading parameter correlation for modeling the land mobile satellite channel

Abstract

This paper addresses the correlation of fading signal parameters for dual-satellite land mobile satellite (LMS) channels. We use Loo's model to describe the slow and fast variations that occur due to varying shadowing conditions and multipath fading, respectively. Loo's parameters (mean power of direct signal component, standard deviaton of direct signal component, and average multipath power) are estimated segment-by-segment from fading signals of two simultaneously measured geostationary satellites using a curve-fitting approach. The parameter correlation between the signals of the two satellites is investigated. A significant correlation is found in the mean power of the direct signal components in some environments, when both satellites are shadowed or blocked by obstacles

Approximating Shadowed Rician Model to Other Simpler Models

“…The problem with Loo's model is in its complexity. Until now, there is no closed form formula for the PDF of the received signal envelope (Konig, Amdt, Ihlow & Heuberger, 2012). Even if we use numerical solutions to calculate required quantities, such as Symbol Error Rate (SER), it will take a lot of time to get results, even with accepted tolerance.…”