Timing estimation based on normalized 4-th order moment for OFDM-based cognitive radio systems

We proposed a new method for timing estimation in cognitive radio systems under a fractional bandwidth (FBW) scenario. A conventional timing estimation based on autocorrelation suffering performance reduction caused by interference and multipath channel distortion. The proposed method is developed based on normalized 4-th order moment for symmetric correlator. Based on these 4-th order moment, a binary hypothesis testing problem is formulated. Computer simulation shows that the method is perform well in high interference and fading multipath channels environment.