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This study is concerned with outage performance analysis of a cognitive two-way relay system having a primary network of one transmitter and multiple receivers over Nakagami-m fading channels. In the considered cognitive radio system, the secondary network facilitates information exchange between source nodes with the aid of multiple decode-and-forward two-way relays. In the presence of multiple relays,...
This paper studies the performance of cognitive underlay decode-and-forward relay systems, where relay and destination nodes are equipped with multiple antennas and channel state information (CSI) of interference links are assumed to be imperfect. To analyze the effect of imperfect CSI on the system performance, the system outage probability has been derived in closed-form expression. Monte Carlo...
This paper is concerned with performance analysis of cognitive underlay partial relay networks with imperfect channel state information (CSI). To assure the required quality of service (QoS) at primary receivers, transmit power at secondary nodes is adjusted by using a back-off power scheme under imperfect CSI condition. The back-off power strategy reduces transmit power at secondary nodes and in...
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