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Sensing of OFDM signals with cyclic delay diversity over doubly‐selective fading channels
Author(s) -
Tian Jinfeng,
Jiang Yonglei,
Chen Huaxia,
Hu Honglin
Publication year - 2012
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.1527
Subject(s) - cyclostationary process , fading , orthogonal frequency division multiplexing , cognitive radio , channel (broadcasting) , computer science , detector , electronic engineering , transmitter , diversity scheme , telecommunications , engineering , wireless
Orthogonal frequency division multiplexing signals with cyclic delay diversity (CDD) exhibit distinguishable cyclostationarity that can be used to design cyclostationary signatures for cognitive radio networks. However, such cyclostationary signatures are seriously weakened over doubly‐selective fading channels, which consequently causes remarkable performance degradation of cyclostationarity‐based detectors. In this paper, we propose a new detector for CDD orthogonal frequency division multiplexing (CDD‐OFDM) signals over doubly‐selective fading channels. By modelling the doubly‐selective fading channel with basis expansion model, we derive the second‐order cyclic statistics of the received CDD‐OFDM signal in close form. Not only the transmitter‐induced cyclostationary characteristics but also the channel‐spread cyclostationary features are exploited for sensing CDD‐OFDM signals that experience doubly‐selective fading. Simulation results indicate that the proposed detector provides substantial performance improvement. Copyright © 2011 John Wiley & Sons, Ltd.