Sidelobe Suppression in Ofdm based Cognitive Radio- Review
Keywords:
OFDM, CR, Sidelobe suppression, Modulation, Spectrum, Licensed user, Secondary user.Abstract
Cognitive radio (CR) technology has attracted lots of attention recently. It is an intelligent wireless communication
system that is aware of its surrounding environment. Orthogonal Frequency Division Multiplexing (OFDM) is proved to be
the best signaling technique for CR systems, as it is able to achieve high data rate communication by utilizing variety of
orthogonal frequency bands that are modulated. The performance of OFDM is severely affected due to the out of band
radiation (OOB) occurring because of sidelobes of modulated subcarriers. Thus the result of a system employing CR with
OFDM suffers from interference between the primary and secondary user. In this paper study of various sidelobe
suppression methods is done and presented. Different problems of sidelobe generation are studied, along with their effects on
a CR system.
