Adaptive spatial reuse of spectrum resources based on multi-parametric quadratic programming for cognitive radio network

For cognitive radio network, there are multiple primary and secondary users in a region. Radio spectrum has the distinctive feature that transmissions at neighboring locations on the same channel interfere with each other, whereas the same channel can be used at far-off locations without mutual interference. Thus, spatial reuse provides an opportunity to increase spectrum efficiency and improve quality-of-service (QoS), etc. This paper presents an effective adaptive spatial reuse method of spectrum sources via multi-parametric quadratic programming. The proposed approach can not only minimize the transmitted power but also guarantee that the received signal-to-interference-plus-noise ratio (SINR) is strictly above the prescribed QoS constrained threshold at each secondary user (SU) and the interference power (IP) is strictly below the prescribed threshold at the primary users (PUs). Simulation results are presented to verify the efficiency of the proposed method.