The κ-μ Shadowed Fading Model: Unifying the κ-μ and η-μ Distributions

This paper shows that the recently proposed kappa-mu shadowed fading model includes, besides the kappa-mu model, the eta-mu fading model as a particular case. This has important relevance in practice, as it allows for the unification of these popular fading distributions through a more general, yet equally tractable, model. The convenience of new underlying physical models is discussed. Then, we derive simple and novel closed-form expressions for the asymptotic ergodic capacity in kappa-mu shadowed fading channels, which illustrate the effects of the different fading parameters on the system performance. By exploiting the unification here unveiled, the asymptotic capacity expressions for the kappa-mu, eta-mu, and Rician shadowed fading models are also obtained in closed form as special cases.