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SCIENCE CHINA Information Sciences, Volume 62, Issue 8: 082302(2019) https://doi.org/10.1007/s11432-018-9813-9

Cooperative resource allocation in cognitive wireless powered communication networks with energy accumulation and deadline requirements

Ding XU1,2,*, Qun LI1
More info
  • ReceivedAug 30, 2018
  • AcceptedJan 30, 2019
  • PublishedJul 11, 2019

Abstract

This study investigates a multi-carrier cognitive wireless powered communication network (CWPCN)with a wirelessly powered primary user (PU).A two-stage cooperative protocol between the PU and the secondaryuser (SU) is adopted so that the PU can harvest energy from the SU while the SUgains transmission opportunities. It is assumed that the energy harvestedby the PU can be accumulated for future usage, and the quality of service of the PU is guaranteed by satisfying the required minimum number of data bitsfor a given deadline. Herein, we maximize the SU rate by considering the time allocation, subcarrier allocation, and power allocation in both an offlinesetting (in which the future channel gains are known a priori) and an onlinesetting (in which only the current channel gains are known). In the offline and online schemes, the maximizationproblem is solved using the block-coordinate descent method and the Lagrangeduality method. The effectiveness of theproposed schemes is evaluated and verified via simulation experiments against benchmark schemes.


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