Average channel capacity for generalized fading scenarios

Novel expressions for the average channel capacity (ACC) of single-branch receivers operating in generalized fading channels, namely η-μ and κ-μ, are derived. The expressions are written in terms of the well-known Meijer's G-functions, which are easily implemented in the most popular computing softwares. In addition, it is shown that, for any given fading condition, the Nakagami-m ACC defines regions of capacity: it lowerbounds the η-μ ACC and it upperbounds the κ-μ ACC. In the same way, it lowerbounds the α-μ ACC for α < 2 and μ > m, and it upperbounds the α-μ ACC for α > 2 and μ < m.