Power Allocation in Cognitive Satellite Terrestrial Networks with QoS Constraints

The increasing demand for high-speed multimedia services and the underutilization of scarce satellite spectral resources have recently led the researchers to propose the concept of cognitive satellite terrestrial networks. Considering this novel architecture, we propose an efficient resource management mechanism for the terrestrial network that acts as the secondary system. We introduce a new power allocation algorithm that optimizes the effective capacity of the terrestrial link for given Quality of Service (QoS) requirements while guaranteeing a specified outage probability for the satellite link. Both perfect and imperfect channel estimation cases are considered in the power allocation scheme and analytical results are presented. Numerical calculations evaluate the performance of the proposed scheme.