The primary exclusive region in cognitive networks
In this paper, we consider a cognitive network in which a single primary transmitter communicates with primary receivers within an area of radius R 0, called the primary exclusive region (PER). Inside this region, no cognitive users may transmit. Outside the PER, provided that the cognitive transmitters are at a minimal distance εp from a primary receiver, they may transmit concurrently with the primary user. We determine bounds on the primary exclusive radius R0 and the guard band εp to guarantee an outage performance for the primary user. Specifically, for a desired rate C0 and an outage probability β, the probability that the primary user's rate falls below C0 is less than β. This performance guarantee holds even with an arbitrarily large number of cognitive users uniformly distributed with constant density outside the primary exclusive region. © IEEE.
