Improved energy detection spectrum sensing method for OFDM-based cognitive radio system

Abstract

The spectrum sensing scheme which is used for detecting primary users in a licensed spectrum are essential to utilize the spectrum effectively for cognitive radio communication systems. As a matter of fact, sensing accuracy is regarded as the most important factor for spectrum sensing with the intension of sufficient protection for the primary user. A novel spectrum sensing scheme which exploits the cyclic prefix of an orthogonal frequency-division multiplexing (OFDM) symbol as well as idle period containing no information symbols is proposed in this chapter. From the analysis and simulation results, it shows that the proposed scheme can improve sensing accuracy and increase system throughput compared with the conventional scheme which uses only idle period. © 2012 Springer Science+Business.