Spectrum sensing method based on past channel sensing information

Abstract

According to the characteristic of the signa1 strength in the cognitive sate11ite communications network that was continua11y changing，a nove1 spectrum sensing method based on the past channe1 sensing information was proposed to overcome the we11-known detection performance 1imitations of c1assica1 energy detection.First，by fo11owing the forgetting mechanism，the detection scheme based on the history of past sensing information was presented to make an accurate judgment.Furthermore，in order to weaken the effect of the parameters，an additiona1 process based on the 1ast time sensing was setup.Theoretica1 ana1ysis and resu1ts of extensive simu1ation demonstrate its improvement on performances.

Keywords

• spectrum sensing;energy detection;forgetting mechanism;past channe1 sensing information