Active subchannel detection for non-contiguous OFDM-based cognitive radio systems

Jie Ding*, Daiming Qu, Xiao Jun Sun, Tao Jiang, Lu Liu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

3 Citations (Scopus)


For non-contiguous OFDM (NC-OFDM) based cognitive radio (CR) systems, one of huge challenges is to establish spectrum synchronization before data transmissions. In this paper, we propose a novel active subchannel detection scheme for the NC-OFDM receiver without out-of-band spectrum synchronization information. The key idea of the proposed scheme is to employ the received training symbol to calculate the a posterior probability (APP) of each subchannel being active, and then APPs are used to make a decision on which subchannels are active and to be processed in data detection. Furthermore, performance analysis of active subchannel detection is given. Both theoretical analysis and simulation results show that the proposed scheme can provide satisfactory performance of the symbol error rate (SER) when the interference from primary users is considered.

Original languageEnglish
Title of host publication2010 IEEE Global Telecommunications Conference, GLOBECOM 2010
Publication statusPublished - 2010
Event53rd IEEE Global Communications Conference, GLOBECOM - 2010 - Miami, United States
Duration: 6 Dec 201010 Dec 2010


Other53rd IEEE Global Communications Conference, GLOBECOM - 2010
Country/TerritoryUnited States


  • Cognitive radio
  • Detection
  • Spectrum synchronization


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