Cooperative Spectrum Sharing for a Primary Network with Capacity Constraint

In this paper, we propose a cooperative framework for spectrum sharing between a secondary random ad hoc network and a primary network with capacity constraint. While the interference from secondary network must satisfy a power constraint, there is no stipulation on its higher order statistics. Considering a generalized Gaussian model for interference, we show that the capacity of a primary link can be improved by increasing the kurtosis of interference. We show that by using power control, the secondary network can increase the kurtosis of its interference and thereby can help the primary links to maintain their minimum capacity constraint. Secondary network is allowed to share the spectrum for a fraction of time proportional to the capacity gain obtained by the primary link. Simulation results show that by cooperation from the secondary network, both secondary and primary networks can achieve their goals in accessing the spectrum and satisfying the capacity constraint.