Open AccessRobust resource allocation for orthogonal frequency division multiplexing‐based cooperative cognitive radio networks with imperfect channel state information
Author(s) -
Yang Weiwei,
Zhao Xiaohui
Publication year - 2017
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2016.0742
Subject(s) - cognitive radio , computer science , resource allocation , mathematical optimization , channel state information , channel (broadcasting) , relay , orthogonal frequency division multiplexing , transmitter power output , computational complexity theory , heuristic , interference (communication) , algorithm , wireless , computer network , power (physics) , transmitter , telecommunications , mathematics , physics , quantum mechanics , artificial intelligence
In this study, the authors study the robust resource allocation problem for orthogonal frequency division multiplexing‐based cooperative cognitive radio networks (CRNs) with decode and forward protocol and consideration of imperfect channel state information. The objective is to maximise the capacity of the cooperative CRN, while the interference to primary user receiver is below a predefined interference threshold and the transmit power of cognitive source and each relay is kept within their power budgets. Considering all possible channel uncertainties, they propose a heuristic robust relay selection scheme and formulate robust power allocation as a semi‐infinite programming (SIP). By the worst‐case approach, the SIP problem is converted into a convex optimisation problem and solved by the Lagrange dual decomposition method. They also analyse feasible regions of the constraints, convergence behaviour and computational complexity of their proposed robust algorithm. Simulation results show the impact of channel uncertainties and the outperformance of the proposed algorithm by comparing with non‐robust algorithms.