1st International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications

Research Article

Implementation Issues of A Wideband Multi-Resolution Spectrum Sensing (MRSS) Technique for Cognitlve Radio (CR) Systems

  • @INPROCEEDINGS{10.1109/CROWNCOM.2006.363471,
        author={J. Park and Y.  Hur and T.J. Song and K. Kim and J.  Lee and K. Lim and C.-H.  Lee and H. S.  Kim and J.  Laskar},
        title={Implementation Issues of A Wideband Multi-Resolution Spectrum Sensing (MRSS) Technique for Cognitlve Radio (CR) Systems},
        proceedings={1st International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications},
        publisher={IEEE},
        proceedings_a={CROWNCOM},
        year={2007},
        month={5},
        keywords={Chromium Cognitive radio Digital modulation Harmonic distortion Narrowband Nonlinear control systems Performance gain Phase modulation Voltage-controlled oscillators Wideband},
        doi={10.1109/CROWNCOM.2006.363471}
    }
    
  • J. Park
    Y. Hur
    T.J. Song
    K. Kim
    J. Lee
    K. Lim
    C.-H. Lee
    H. S. Kim
    J. Laskar
    Year: 2007
    Implementation Issues of A Wideband Multi-Resolution Spectrum Sensing (MRSS) Technique for Cognitlve Radio (CR) Systems
    CROWNCOM
    IEEE
    DOI: 10.1109/CROWNCOM.2006.363471
J. Park1,*, Y. Hur2, T.J. Song1, K. Kim1, J. Lee3, K. Lim1, C.-H. Lee2, H. S. Kim4, J. Laskar1
  • 1: Georgia Electronic Design Center (GEDC), Georgia Institute of Technology, Atlanta, GA, USA
  • 2: Samsung RFIC Design Center at Georgia Tech., Atlanta, GA, USA
  • 3: Samsung Electro-Mechanics Inc., Suwon, Korea
  • 4: Hanbat National University, Daeleon, Korea
*Contact email: park@gatech.edu

Abstract

Spectrum sensing is a key function for a cognitive radio (CR) system. An analog-based multi-resolution spectrum sensing (MRSS) technique was proposed as a flexible, low-power, high-speed spectrum-sensing solution. In this paper, implementation issues of the MRSS technique are investigated, and the corresponding practical specifications are suggested. First, nonlinear effects from a voltage-controlled oscillator (VCO) and multipliers are explored. System simulation results show that harmonic distortion components of VCO and wavelet-pulse power levels should be controlled to alleviate these nonlinear effects. Afterward, I/Q phase- and gain-mismatch effects ore addressed. Specifically, narrow-band signals are more sensitive to these gain and phase mismatches compared to broadband digital modulated signals. Overall, phase mismatch is more sensitive than gain mismatch on MRSS performance, showing a linear degradation of a detected power-level up to a 60-degree phase-mismatch