An independent component analysis (ICA) based method is designed for improving the effect of grid radio monitoring and providing an effective layout of the monitoring system, in which the source signals can be retrieved and sudden emergence of abnormal signal sources can be detected. To analyze the multiple factors affecting the performance of the method, a MATLAB simulation modeling is built. The feasibility and efficiency of the proposed ICA based method are also demonstrated.

The multiple access control (MAC) protocol in broadband satellite access network is investigated. A novel combined dynamic allocation multi-access scheme is proposed, which is based on the chaotic prediction of self-similar traffic. The OPNET simulation system is developed for comparing the performance of different schemes. Simulation results indicate that the novel scheme has better performance when the traffic data exhibit self-similarity. The superiority of centralized access control with satellite onboard processing (OBP) is also proved.