摘要
多波束卫星通信系统能够为移动用户提供全球范围的通信服务.然而,由于条件限制,星上资源利用率较低,并且星地距离较远,业务传输过程中存在较大时延.为了提高星上资源的利用率,本文在有波束干扰的多波束卫星通信系统中,针对有严格时延要求的卫星通信业务,提出了一种新的下行链路资源分配算法,增加了业务时延限制和最大干扰功率限制两种约束条件,满足各点波束的最大业务时延要求以及对地面网络通信的干扰影响.本文同时考虑了各点波束的相互干扰对系统容量的影响,以最大化满足点波束业务需求量为优化目标,利用拉格朗日对偶理论和次梯度下降法得到最优资源分配结果.仿真结果表明:在噪声功率谱密度相同的信道条件下,与现有的几种算法相比,本文提出的算法可满足每个点波束的时延要求,具有较好的公平性,同时提高了系统的总传输速率,降低了点波束业务需求与所分配通信资源之间的差值,最大化满足用户通信业务需求;在噪声功率谱密度不同的信道条件下,本文提出的算法仍保持较好的公平性.
Multi-beam satellite communication system can provide mobile users with global communication services.However, the on-board resource utilization is low due to the limited resources as well as the long distance between satellites and the earth, and the resulted time delay in service transmission.To address this, we propose a new downlink resource allocation algorithm for a multi-beam satellite communication system with beam interference, which is designed under two constraints of strict service delay and limited maximum interference power.Meanwhile, the influence of inter-beam interference on the system capacity is considered, and the Lagrange duality theory and sub-gradient descent method are used to obtain the optimal resource allocation strategy in order to maximize the service capacity of spot beam.The simulation results show that under the same noise power spectral density channel, the proposed algorithm meets the time delay requirement for each spot beam, has good fairness, improves the system in total transmission rate, and reduces the difference between the spot beam service demand and the allocated communication resources, therefore can provide maximized communication service to users;while under the condition of different noise power spectral densities, the proposed algorithm still maintains good fairness.
作者
司闯
李鹏
史传胜
葛旗伟
SI Chuang;LI Peng;SHI Chuansheng;GE Qiwei(School of Electronics&Information Engineering,Nanjing University of Information Science&Technology,Nanjing 210044)
出处
《南京信息工程大学学报（自然科学版）》
CAS
北大核心
2022年第2期233-240,共8页
Journal of Nanjing University of Information Science & Technology（Natural Science Edition）
基金
国家自然科学基金(61501244,61501245)
江苏省自然科学基金(BK20150932)。
关键词
卫星通信
多波束
波束干扰
资源优化
时延
干扰功率
satellite communication
multi-beam
beam interference
resource optimization
time delay
interference power
