Team for Research in
Ubiquitous Secure Technology

Citation
Arash Parsa, Amin Aminzadeh Gohari, Anant Sahai. "Exploiting Interference Diversity for Event-Based Spectrum Sensing". 2008 IEEE Symposium on Dynamic Spectrum Access Networks (DySpAN)., 2008.

Abstract
Spectrum sensing is a core problem in cognitive radio. Detecting the presence/absence of very weak primary users with a single antenna can be very difficult. Environmental uncertainties result in SNR walls that detectors cannot overcome. Multiple-antenna approaches show some potential gains, but we show here that single user multiple-antenna detection still must suffer from an SNR wall. The reason is that the real-world uncertainty in noise is dominated by the potential presence of an unknown number of low-power and time-varying interference sources in the external environment. Traditional collaborative spectrum sensing attempts to use the shadowing/multipath diversity across different users to boost the reliability of detection. We show that there is another kind of diversity that is also available: interference diversity. This captures the fact that low powered interference sources are local to individual users whereas the primary user has a global footprint. To exploit this diversity, we must shift our perspective from existence based detection (whether the primary is present or not) to event-based detection (whether the primary has turned off or on).

Electronic downloads

• http://www.eecs.berkeley.edu/~aminzade/DyspanFinalVersion.pdf

• HTML

  Arash Parsa, Amin Aminzadeh Gohari, Anant Sahai. <a
  href="http://www.truststc.org/pubs/462.html"
  >Exploiting Interference Diversity for Event-Based
  Spectrum Sensing</a>, 2008 IEEE Symposium on Dynamic
  Spectrum Access Networks (DySpAN)., 2008.

• Plain text

  Arash Parsa, Amin Aminzadeh Gohari, Anant Sahai.
  "Exploiting Interference Diversity for Event-Based
  Spectrum Sensing". 2008 IEEE Symposium on Dynamic
  Spectrum Access Networks (DySpAN)., 2008.

• BibTeX

  @inproceedings{ParsaGohariSahai08_ExploitingInterferenceDiversityForEventBasedSpectrum,
      author = {Arash Parsa and Amin Aminzadeh Gohari and Anant
                Sahai},
      title = {Exploiting Interference Diversity for Event-Based
                Spectrum Sensing},
      booktitle = {2008 IEEE Symposium on Dynamic Spectrum Access
                Networks (DySpAN).},
      year = {2008},
      abstract = {Spectrum sensing is a core problem in cognitive
                radio. Detecting the presence/absence of very weak
                primary users with a single antenna can be very
                difficult. Environmental uncertainties result in
                SNR walls that detectors cannot overcome.
                Multiple-antenna approaches show some potential
                gains, but we show here that single user
                multiple-antenna detection still must suffer from
                an SNR wall. The reason is that the real-world
                uncertainty in noise is dominated by the potential
                presence of an unknown number of low-power and
                time-varying interference sources in the external
                environment. Traditional collaborative spectrum
                sensing attempts to use the shadowing/multipath
                diversity across different users to boost the
                reliability of detection. We show that there is
                another kind of diversity that is also available:
                interference diversity. This captures the fact
                that low powered interference sources are local to
                individual users whereas the primary user has a
                global footprint. To exploit this diversity, we
                must shift our perspective from existence based
                detection (whether the primary is present or not)
                to event-based detection (whether the primary has
                turned off or on). },
      URL = {http://www.truststc.org/pubs/462.html}
  }
  

Posted by Amin Aminzadeh Gohari on 23 Aug 2008.
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