Spectrum shaping via network coding in cognitive radio networks

Shanshan Wang, Yalin E. Sagduyu, Junshan Zhang, Jason H. Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

21 Scopus citations


We consider a cognitive radio network where primary users (PUs) employ network coding for data transmissions. We view network coding as a spectrum shaper, in the sense that it increases spectrum availability to secondary users (SUs) and offers more structure of spectrum holes, which in turn improves the predictability of the primary spectrum. With this spectrum shaping effect of network coding, each SU can carry out adaptive channel sensing by dynamically updating the list of the (predicted) idle PU channels and giving priority to these channels for spectrum sensing. This dynamic spectrum access approach with network coding improves how SUs detect and utilize spectrum holes over PU channels. Our results show that compared to the existing approaches based on retransmission, both PUs and SUs can achieve higher stable throughput, thanks to the spectrum shaping effect of network coding.

Original languageEnglish (US)
Title of host publication2011 Proceedings IEEE INFOCOM
Number of pages5
StatePublished - Aug 2 2011
EventIEEE INFOCOM 2011 - Shanghai, China
Duration: Apr 10 2011Apr 15 2011

Publication series

NameProceedings - IEEE INFOCOM
ISSN (Print)0743-166X




  • Cognitive radio networks
  • dynamic spectrum access
  • network coding
  • spectrum shaping

ASJC Scopus subject areas

  • Computer Science(all)
  • Electrical and Electronic Engineering


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