A Tractable Product Channel Model for Line-of-Sight Scenarios

We here present a general and tractable model for line-of-sight (LOS) scenarios, which is based on the product of two independent and non-identically distributed κ-μ shadowed random variables. Simple closed-form expressions for the probability density function, cumulative distribution function and moment-generating function are derived, which are as tractable as the corresponding expressions derived from a product of Nakagami-m random variables. This model simplifies the challenging characterization of LOS product channels, as well as combinations of LOS with non-LOS ones. It also shows a higher flexibility when fitting measurements with respect to exact approaches based on the Rician distribution.