This document summarizes several statistical distributions used to model fading in wireless communication channels: Rician, Rayleigh, and lognormal distributions. It describes the Rayleigh distribution as modeling channels without a line-of-sight component, where the received signal envelope follows a Rayleigh distribution. The Rician distribution models channels with a dominant line-of-sight component, reducing to a Rayleigh distribution when the line-of-sight component fades. It also briefly discusses the Okumura and Hata propagation path loss models used for cellular system design.