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has been cited by the following article:

• TITLE: Sidelobe Suppression in CR-OFDM system by Adding Extended Data Carriers

  AUTHORS: Tianwei Wen, Yafeng Wang

  KEYWORDS: Cognitive Radio; Extended Data Carrier; OFDM; Sidelobe Suppression; Linear Least Square

  JOURNAL NAME: Communications and Network, Vol.5 No.3C, November 12, 2013

  ABSTRACT: Out-band radiation is a severe problem for Cognitive Radio with OFDM system (CR-OFDM) which is caused by the sidelobe of OFDM signals. Lots of studies have been done on suppressing the sidelobe power and numerous methods have been proposed. In this paper, we propose a novel method to minimize the sidelobe by adding extended data carrier so called EDC to the original data carriers so as to protect primary user (PU) spectrum. Unlike the methods before, the EDCs are deployed within the secondary user (SU) data frequency spectrum to fully use the spectrum. Moreover, we derive the linear least squares problem to get the optimal weighting factors of EDCs to minimize the sidelobe power which is subject to an original data interference constraint. By simulation, we find that EDC is more capable in sidelobe suppression than method of Cancellation Carrier (CC) while EDC has only a small loss in BER performance.