9th International Conference on Cognitive Radio Oriented Wireless Networks

Research Article

Energy Detection in Full-Duplex Cognitive Radios under Residual Self-interference

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  • @INPROCEEDINGS{10.4108/icst.crowncom.2014.255395,
        author={Taneli Riihonen and Risto Wichman},
        title={Energy Detection in Full-Duplex Cognitive Radios under Residual Self-interference},
        proceedings={9th International Conference on Cognitive Radio Oriented Wireless Networks},
        publisher={IEEE},
        proceedings_a={CROWNCOM},
        year={2014},
        month={7},
        keywords={energy detection full duplex self-interference},
        doi={10.4108/icst.crowncom.2014.255395}
    }
    
  • Taneli Riihonen
    Risto Wichman
    Year: 2014
    Energy Detection in Full-Duplex Cognitive Radios under Residual Self-interference
    CROWNCOM
    IEEE
    DOI: 10.4108/icst.crowncom.2014.255395
Taneli Riihonen1,*, Risto Wichman1
  • 1: Aalto University School of Electrical Engineering
*Contact email: taneli.riihonen@aalto.fi

Abstract

This paper investigates the possibility to exploit in-band full-duplex wireless technology for simultaneous spectrum sensing and data transmission in cognitive radio terminals. The focus is especially on the receiver operating characteristics of basic energy detection. Full-duplex operation suffers from self-interference, even after cancellation since it is imperfect in practice. The effect on the probability of missed detection is analyzed, and increasing sensing time is proposed as a countermeasure for residual distortion which, unlike in half-duplex operation, does not cause large overhead due to lost transmission opportunities. The study also compares the two- and single-antenna implementations of full-duplex radios and elicits a channel imbalance problem in the former due to which sensing provides different information than the transmitting antenna would observe.