Multi-Antenna Down-link Cooperative Systems over Composite Multipath/Shadowing Channels

In this paper, we investigate the effects of shadowing and multi-path fading on a MIMO down-link amplifyand-forward (AF) dual-hop network. In the system, antenna selection is adopted at the first hop based on the shadowing information and we assume both hops undergo Generalized-K composite fading channel. For the considered model, approximate lower bound outage and error probability expressions are derived and asymptotic analysis is performed to investigate the effects of shadowing on the system performance. Moreover, the power allocation optimization problem is studied where optimal power values are obtained. Finally, the analytical findings are validated by the simulations.