2nd International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications

Research Article

Cyclostationary Signature Detection in Multipath Rayleigh Fading Environments

  • @INPROCEEDINGS{10.1109/CROWNCOM.2007.4549833,
        author={Paul Sutton and Jorg Lotze and Keith Nolan and Linda Doyle},
        title={Cyclostationary Signature Detection in Multipath Rayleigh Fading Environments},
        proceedings={2nd International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications},
        keywords={Bandwidth  Degradation  Frequency division multiplexing  Interference  Rayleigh channels  Robustness  Signal detection  Signal processing  Watermarking  Wireless networks},
  • Paul Sutton
    Jorg Lotze
    Keith Nolan
    Linda Doyle
    Year: 2008
    Cyclostationary Signature Detection in Multipath Rayleigh Fading Environments
    DOI: 10.1109/CROWNCOM.2007.4549833
Paul Sutton1,*, Jorg Lotze1,*, Keith Nolan1,*, Linda Doyle1,*
  • 1: Centre for Telecommunications Value-chain Research (CTVR), University of Dublin, Trinity College Dublin, Rep. of Ireland Telephone: (+353) 1-8968443 Fax: (+353) 1-8968442
*Contact email: suttonpd@tcd.ie, lotzej@tcd.ie, keith.nolan@ctvr.ie, ledoyle@tcd.ie


Cognitive radio-based Open Spectrum systems offer a solution to the issue of spectrum scarcity by allowing wireless networks to dynamically access spectrum while coordinating to co-exist and avoid the creation of harmful interference. However, before a practical open spectrum system may be implemented, a number of significant technical and policy challenges must be overcome. One such technical challenge is the distributed coordination of operating frequencies and bandwidths between co-existing systems. Cyclostationary signatures have been shown to be a powerful tool in overcoming this challenge. A cyclostationary signature is a unique identifier or watermark which may be embedded in the physical properties of a communications signal. Such signatures may be used to aid peer devices in performing a number of critical tasks, including signal detection, classification and frequency acquisition. A key limitation of cyclostationary signatures when implemented in orthogonal frequency division multiplex (OFDM)- based systems is the sensitivity exhibited in time-variant multipath Rayleigh fading environments. Although OFDM-based systems offer robust performance under multipath conditions, detection of cyclostationary signatures can be severely degraded. As signature detection is adversely affected, the ability of Open Spectrum Systems to coordinate and coexist is seriously undermined. This paper therefore presents techniques for effectively overcoming the issue of multipath Rayleigh fading in the detection of cyclostationary signatures for Open Spectrum systems. Approaches for the generation and detection of signatures in OFDMbased waveforms are outlined and improvements in detection performance are illustrated using simulation results.