Abstract
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.
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