Research On Ka-band Multi-beam Satellite Power Allocation Algorithms

In the multi-beam satellite communication system,there are shortcomings of limited on-board resources(such as power,bandwidth,computation and storage area).Therefore,how to allocate and manage on-board resources reasonably,so as to further improve the utilization rate of on-board resources,has very important research significance.Based on these problems,this paper has explored the following work in depth:Firstly,the channel characteristics of Ka-band multi-beam satellite system are introduced.And we analyze the effects of antenna elevation and radio frequency on four attenuations,namely,free space loss,atmospheric absorption loss,atmospheric scintillation loss and cloud and fog loss.And then rainfall attenuation characteristics of Ka-band multi-beam satellite communication system are studied.The effects of rainfall rate,antenna elevation and radio frequency on rainfall attenuation are analyzed using ITU-R rain attenuation model.The Ka-band rainfall attenuation values of 65 main ground stations in China are calculated,which provides data support for the follow-up algorithm research.Secondly,in order to solve the problem that multi-beam satellite systems have limitations on time delay in practice,a joint optimal power allocation algorithm for multi-beam satellites is optimized by introducing the constraints of time delay constraints.And a joint optimal power allocation algorithm with delay constraints is constructed.The algorithm is simulated and validated on Matlab platform.The simulation results show that the optimized algorithm can make the actual channel capacity of each beam not less than the minimum traffic request that meets the delay limit,and meet the system's delay limit requirements.Thirdly,a joint bandwidth and power allocation algorithm for multi-beam satellites considering inter-beam interference is studied.The algorithm is simulated and validated on Matlab platform.The simulation results show that the proposed algorithm can distribute bandwidth and power resources more flexibly and fairly,and the utilization ratio of bandwidth and power resources is higher than that of single optimal power and bandwidth allocation algorithms.Finally,the joint bandwidth and power allocation algorithm considering inter-beam interference is optimized.By introducing the beam selection factor,the effective beams are selected before allocating the bandwidth and power.Then a joint inter-beam bandwidth and power allocation algorithm with beam selection is constructed.The algorithm is simulated and validated on Matlab platform.The simulation results show that the optimized algorithm reduces the computational load,improves the total capacity of the system,and improves the utilization of bandwidth and power resources.In addition,the optimized algorithm has more fairness in resource allocation than the algorithm that optimizes bandwidth resource and power resource separately.