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The ergodic capacity of underlay cognitive (secondary) dual-hop relaying systems is analytically investigated. Specifically, the amplify-and-forward transmission protocol is considered, while the received signals undergo multipath fading and shadowing with non-identical statistics. To efficiently describe this composite type of fading, the well-known generalized-K fading model is used. New analytical expressions and quite accurate closed-form approximations regarding the ergodic capacity of the end-to-end communication are obtained, in terms of finite sum series of the Meijer's-G function. The analytical results are verified with the aid of computer simulations, while useful insights are revealed.

ieee communications letters

On the Ergodic Capacity of Underlay Cognitive Dual-Hop AF Relayed Systems Under Non-Identical Generalized-<inline-formula> <tex-math notation="LaTeX">$K$</tex-math></inline-formula> Fading Channels

On the Ergodic Capacity of Underlay Cognitive Dual-Hop AF Relayed Systems Under Non-Identical Generalized- $K$ Fading Channels