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A low‐complexity resource allocation algorithm in OFDMA‐based cooperative cognitive radio networks
Author(s) -
Tang Yi,
Wang Lijie,
Zhao Haitao,
Wei Jibo
Publication year - 2014
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.2916
Subject(s) - computer science , subcarrier , cognitive radio , resource allocation , relay , interference (communication) , orthogonal frequency division multiple access , orthogonal frequency division multiplexing , transmission (telecommunications) , computer network , channel (broadcasting) , algorithm , power (physics) , telecommunications , wireless , physics , quantum mechanics
Summary In this paper, we propose a low‐complexity resource allocation algorithm for the orthogonal frequency division multiplexing cooperative cognitive radio networks, where multiple primary users (PUs) and multiple secondary users (SUs) coexist. Firstly, we introduce a new concept of ‘efficiency capacity’ to represent the channel conditions of SUs by considering both of the interference caused by the PUs and the channel gains of the SUs with the assist of the relays. Secondly, we allocate the relay, subcarrier and transmission power jointly under the constraint of limiting interference caused to the PUs. Simulation results show that the proposed algorithm can achieve a high data rate with a relative low power level. Copyright © 2014 John Wiley & Sons, Ltd.