Sidelobe Suppression for Non-systematic Coded UW-OFDM in Cognitive Radio Networks
Konferenz: European Wireless 2014 - 20th European Wireless Conference
14.05.2014 - 16.05.2014 in Barcelona, Spain
Tagungsband: European Wireless 2014
Seiten: 6Sprache: EnglischTyp: PDFPersönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt
Rajabzadeh, Morteza; Steendam, Heidi (DIGCOM Research Group, TELIN Dept., Ghent University, Ghent, Belgium)
Rajabzadeh, Morteza; Khoshbin, Hossein (Electrical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran)
In this paper, a novel non-contiguous non-systematic coded unique word (UW)-OFDM system is proposed to opportunistically transmit data on the spectrum holes available in a cognitive radio network. In such a system, the spectral sidelobes of the active subcarriers interfere with the adjacent spectral band used by the primary system. In the proposed scheme, the code generator matrix of the UW-OFDM is designed to suppress the sidelobes. So, there is no need to add any extra processing to the transmitter for suppressing sidelobes. The derived code generator matrix is optimum in the sense of being matched to the best linear unbiased estimator and to the linear minimum mean square error data estimators. The achieved sidelobe suppression is a function of the number of transmitted data symbols. Simulation results show that by a slight decrease in the number of transmitted data symbols, the sidelobes power can be suppressed to zero.