BWRC Publications

Citation
Anant Sahai, Mubaraq Mishra, Rahul Tandra, Kristen Ann Woyach. "Cognitive Radios for Spectrum Sharing". IEEE Signal Processing Magazine, 26(1):140-145, January 2009.

Abstract
The radios of tomorrow will be capable of frequency agility. This is good because under the current static system of frequency assignment a great deal of spectrum remains underused. Using the FCC database of television towers and ITU propagation models, we see that about half of the TV channels are safely available for medium-range use across the United States. However, if we try to detect these opportunities using single radios acting alone, then only half of these opportunities will typically show up as being guaranteed to be safe. This is because the fear of fading forces us to try and rule out even very weak channels from use. Such detection of weak channels has its own signal processing challenges that arise from the uncertainty in the noise models. The fading uncertainty can be overcome by using cooperative sensing approaches, but this leads to another problem --- how can cooperative sensing approaches ever be certified and regulated? To avoid putting the government in the precarious position of trying to prove the correctness of code and protocols, we study the overhead that would be imposed by a more reactive system of spectrum policing and punishment. There are two prongs to this strategy. First, radios must be certified to be appropriately vulnerable to punishment in the form of spectrum jails where the more bands a radio wants to expand into, the more severe are the jail sentences. This leads to overhead in the form of innocent radios being wrongfully convicted and thus sitting in jails for a time. The second is for radios to explicitly encode their identity in their transmission patterns to both allow themselves to be more easily caught as well as prevent wrongful conviction by allowing themselves to be distinguished from other suspects. This leads to overhead in the form of spectrum that goes unused for data transmission because it is being implicitly used to convey identity information.

Electronic downloads

• SPMag_Jan.pdf · application/pdf · 3963 kbytes

Citation formats

• HTML

  Anant Sahai, Mubaraq Mishra, Rahul Tandra, Kristen Ann
  Woyach. <a
  href="http://bwrc.eecs.berkeley.edu/php/pubs/pubs.php/821.html">Cognitive
  Radios for Spectrum Sharing</a>, <i>IEEE Signal
  Processing Magazine</i>, 26(1):140-145, January 2009.

• Plain text

  Anant Sahai, Mubaraq Mishra, Rahul Tandra, Kristen Ann
  Woyach. "Cognitive Radios for Spectrum Sharing". IEEE
  Signal Processing Magazine, 26(1):140-145, January 2009.

• BibTeX

  @article{SahaiMishraTandraWoyach2009,
      author = {Anant Sahai and Mubaraq Mishra and Rahul Tandra
                and Kristen Ann Woyach},
      title = {Cognitive Radios for Spectrum Sharing},
      journal = {IEEE Signal Processing Magazine},
      volume = {26},
      number = {1},
      pages = {140-145},
      month = {January},
      year = {2009},
      URL = {http:///php/pubs/pubs.php/821.html}
  }
  

Posted by Mubaraq Mishra on Jan 12, 2009..

Notice: This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright.