基于干扰感知的多星协同跳波束资源分配

Multi-satellite cooperative beam hopping resource allocation based on interference perception

跳波束(beam hopping,BH)技术是解决低地球轨道(low earth orbit,LEO)卫星资源分配的波束个数受限及传输需求不均匀问题的关键技术,但是现有研究仅考虑了单颗LEO卫星的跳波束资源分配,即一颗卫星服务一个地面区域的跳波束资源分配方案。然而实际的LEO卫星覆盖是由多个轨道上的多颗卫星同时协同覆盖的。现有方案仅考虑单颗卫星的跳波束资源分配,会带来卫星间的波束干扰,导致通信质量下降,吞吐量降低。针对上述问题,提出了基于干扰感知的LEO多星协同跳波束资源分配(IARA-BH)方案,在满足用户需求的前提下,以优化网络的干扰分布水平、提升网络系统吞吐量为目标,寻找最优的跳波束资源分配方案。仿真结果表明,相比较仅考虑单星的跳波束资源分配方案,多星协同跳波束资源分配方案的平均信号干扰比(signal to interference ratio,SIR)提升了15.52%,同时系统吞吐量提升了5.72%。

Beam hopping(BH)is a crucial technology in the low earth orbit(LEO)satellite system with limited beams number and uneven transmission requirements.However,the existing research only considers the resource al-location of a single LEO satellite,that is,the resource allocation scheme in which one satellite serves one ground area.However,the actual LEO satellite coverage is simultaneously covered by multiple satellites in multiple orbits.Exist-ing schemes only consider the resource allocation of a single satellite,which will cause beam interference between satellites,resulting in a decrease in communication quality and throughput.In response to the above problems,an in-terference aware cooperative resource allocation scheme for LEO with beam hopping(IARA-BH)was proposed.The basic idea of IARA-BH was to improve the interference distribution and throughput of multi-satellite networks under the constraint of guaranteeing user requirements by coordinating beam interference between satellites.The experi-ment results show that compared with the single-satellite beam hopping resource scheduling scheme,the mul-ti-satellite cooperative beam hopping resource scheduling scheme can improve the average signal to interference ratio(SIR)by 15.52%,and the system throughput can be increased by 5.72%.