ML estimation of time and frequency offset in OFDM systems
IEEE Transactions on Signal Processing
Cooperative Spectrum Sensing in Cognitive Radio, Part I: Two User Networks
IEEE Transactions on Wireless Communications
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
Hi-index | 0.00 |
Sensing the weak signals of primary users by cognitive devices greatly challenges the capability of energy detector under noise uncertainty. This paper proposes three schemes for detecting the primary signals of OFDM type. They are based on the auto-correlation ratio detection and exploit the multi-path diversity gain and multi-user cooperation. The detection and false alarm probabilities are then calculated and analyzed. The simulation results show that They effectively improve the performance of the ratio detection.