Resource allocation in cognitive wireless powered communication networks with wirelessly powered secondary users and primary users

摘要

＜正＞Dear editor,Wireless powered communication networks（WPCNs） are popular especially for wireless sensor networks where sensors can be wirelessly powered. For coordinating wireless power and information transfer, Ju and Zhang in their pioneer work [1] proposed a "harvest-then-transmit" protocol for WPCN, where the time for wireless power transfer （WPT） and wireless information transfer（WIT） is divided into two phases:the WPT phase and WIT phase. Meanwhile, cognitive radio （CR）