Distributed Spectrum Sensing with Two-Stage Detection for Cognitive Radio
Yohannes D. Alemseged, Chen Sun, Ha Nguyen Tran, Hiroshi Harada · 2009
In this paper we investigate spectrum sensing for cognitive radio (CR) by using multiple spectrum sensors. We explore sensing schemes based on soft information combining, hard information combining and a two-stage detection scheme that uses both soft information combining and hard information combining. The two-stage detection scheme is shown to provide improved performance compared to sensing based on either hard information combining or soft information combining alone with a trade-off of sensing time. Computer simulation results are provided to validate the concept.