Ergodic Capacity Analysis of Cognitive System with Self-Sustainable Relay and Statistical CSI

The cooperative cognitive wireless system based on underlay paradigm with available statistical channel state information (CSI) is considered in this paper. The primary and the cognitive network share the same spectrum band, under the constraint of interference threshold and maximal tolerable outage permitted by the primary user. The communication in the cognitive decode-and-forward (DF) relaying system is established via energy constrained relay, which harvests energy from both cognitive and primary transmitters. The ergodic capacity analysis is provided and the results are corroborated by an independent simulation method.