Sidelobe suppression using extended active interference cancellation with self-interference constraint for cognitive OFDM system

Daiming Qu, Zhiqiang Wang, Tao Jiang, Mahmoud Daneshmand

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

8 Scopus citations

Abstract

To improve the spectrum utilization, more and more attention was paid to OFDM based opportunistic spectrum access (OSA) systems in recent years. In this paper, to enable coexistence between a secondary user and a primary user, a novel method called EAIC was proposed for spectral sculpting of OFDM signal effectively. In EAIC, however, the cancellation signals cause self-interferences to OFDM data tones so that the symbol-error-rate (SER) performance was degraded especially in high order modulation such as 64 QAM. In this paper, a new method called EAIC with self-interference constraint (EAIC-IC) is proposed, in which we analyze the interferences caused by cancellation signals, and then formulate an optimization problem to minimize both the total sidelobe power and the self-interferences. Simulation results show that the EAIC-IC method can provide a perfect tradeoff between spectrum notch depth and SER performance via adjusting the value of the constraint parameter.

Original languageEnglish
Title of host publication2009 4th International Conference on Communications and Networking in China, CHINACOM 2009
Pages219-223
Number of pages5
DOIs
StatePublished - 2009
Event2009 4th International Conference on Communications and Networking in China, CHINACOM 2009 - Xian, China
Duration: 26 Aug 200928 Aug 2009

Publication series

Name2009 4th International Conference on Communications and Networking in China, CHINACOM 2009

Conference

Conference2009 4th International Conference on Communications and Networking in China, CHINACOM 2009
Country/TerritoryChina
CityXian
Period26/08/0928/08/09

Keywords

  • Cognitive radio
  • OFDM
  • Oppotunistic spectrum access
  • Out-of-band radiation
  • Sidelobe suppression

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