Subspace-Based Method for Spectrum Sensing With Multiple Users Over Fading Channel

Spectrum sensing with single primary user (PU) has attracted the attention of researchers due to its influence on the scarce radio spectrum. Yet, the co-existence of multiple PUs within the sensing region is considered rarely. In this letter, spectrum sensing with multiple users over fading channel is investigated based on subspace filtering in the same frequency band. The corresponding closed-form solution of the false alarm and detection probabilities is given together with simulation verifications.