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This paper investigates the impact of the channel state information (CSI) andantenna correlation at the multi-antenna relay on the performance of wirelesspowered dual-hop amplify-and-forward relaying systems. Depending on theavailable CSI at the relay, two different scenarios are considered, namely,instantaneous CSI and statistical CSI where the relay has access only to theantenna correlation matrix. Adopting the power-splitting architecture, wepresent a detailed performance study for both cases. Closed-form analyticalexpressions are derived for the outage probability and ergodic capacity. Inaddition, simple high signal-to-noise ratio (SNR) outage approximations areobtained. Our results show that, antenna correlation itself does not affect theachievable diversity order, the availability of CSI at the relay determines theachievable diversity order. Full diversity order can be achieved withinstantaneous CSI, while only a diversity order of one can be achieved withstatistical CSI. In addition, the transmit antenna correlation and receiveantenna correlation exhibit different impact on the ergodic capacity. Moreover,the impact of antenna correlation on the ergodic capacity also depends heavilyon the available CSI and operating SNR.

Wireless Powered Dual-Hop Multi-Antenna Relaying Systems: Impact of CSI and Antenna Correlation