Impact of Beacon Misdetection on Aggregate Interference for Hybrid Underlay-Interweave Networks

The impact of beacon misdetection on the aggregate interference from a hybrid underlay-interweave network is analyzed, for a Poisson field of cognitive radio (CR) nodes distributed over an annular region. This network consists of two types of nodes: underlay, and interweave. The underlay nodes are allowed to transmit anytime, whereas the interweave nodes must first sense an out-of-band beacon. When this sensing is erroneous, interweave node transmissions increase the interference. We analyze the interference statistics by deriving the exact moment generating function, the mean, and the outage probability of the primary receiver, for path loss and Rayleigh fading. Our analysis suggests that hybrid underlay-interweave CR systems are more suitable for areas with low path loss exponents such as rural/suburban environments.