Research Article
Sidelobe Suppression for OFDM based Cognitive Radio Systems
@INPROCEEDINGS{10.1109/CHINACOM.2009.5339744, author={Xiao Fu and Jun Wanf and Shao Qian Li}, title={Sidelobe Suppression for OFDM based Cognitive Radio Systems}, proceedings={3rd International ICST Workshop on Cognitive Radio Network}, publisher={IEEE}, proceedings_a={CRNET}, year={2009}, month={11}, keywords={Cognitive Radio; interference suppression; capacity; cancellation subcarriers; subcarrier weighting}, doi={10.1109/CHINACOM.2009.5339744} }- Xiao Fu
Jun Wanf
Shao Qian Li
Year: 2009
Sidelobe Suppression for OFDM based Cognitive Radio Systems
CRNET
IEEE
DOI: 10.1109/CHINACOM.2009.5339744
Abstract
This paper investigates the sidelobe suppression techniques of Orthogonal Frequency Division Multiplexing (OFDM) based Cognitive Radio (CR) systems. We firstly argue that the existing sidelobe suppression algorithms cannot satisfy the special requirements of CR systems. Then we formulate the interference suppression problem of CR systems into two algorithms from capacity perspective, namely, average power allocation with cancellation subcarrier (CCs) scheme and adaptive subcarrier weighting scheme. We show that the capacity of the two schemes can well approximate the ideal waterfilling algorithm performance. We further show that under tough interference suppression requirement of licensed users (LU), the adaptive subcarrier weighting scheme is a better choice for CR systems.
