Cooperative Spectrum Sensing in OFDM Based on MIMO Cognitive Radio Sensor Networks
Wei Ma, Sen Zhe Hu, Yan Cong Wang, Liang Zhu · 2009
Sharing of frequency spectrum between licensed primary users and unlicensed secondary users (SUs) requires reliable detection of spectrum occupancy by the SUs. We present a a new cooperative spectrum sensing in OFDM system based on MIMO cognitive radio (CR) sensor networks. We present a new interference temperature estimation approach based on OFDM technique in MIMO system. Frequency spectrum sensing combination of the observed energy values from different cognitive radio users is investigated. Square-law-combining (SLC) is theoretically proved to be nearly optimal in low signal-to-noise ratio (SNR) region, an usual scenario in the context of MIMO cognitive radio sensor networks. Simulation and experiment results show a substantial improvement for the utilizations of frequency spectrum of SUs.