摘要： 多波束卫星通信系统由于频率复用导致波束间存在干扰。为此,通过引入干扰系数,构建带宽功率联合分配模型,将该资源分配问题拆分为功率分配、带宽分配和对偶变量更新3个子问题,并提出相应的分配算法。算法在初次完成功率以及带宽分配后,利用子梯度算法更新对偶变量,对功率和带宽进行再分配,如此进行迭代计算,直至满足对偶变量收敛条件,由此实现分配结果的最优。仿真结果表明,与功率和带宽均匀分配算法及按比例分配算法相比,该算法在明显降低系统二阶业务拒绝量的同时,提高了系统容量。

关键词: 卫星通信系统, 多波束, 波束间干扰, 资源分配, 联合分配, 凸优化

Abstract: In consideration of the inter-beam interference in multi-beam satellite communication systems,a model of a multi-beam satellite system with inter-beam is set up by introducing with interference factor.Then,a joint power bandwidth allocation algorithm is proposed.The resource allocation problem is divided into three sub-problems:power allocation,bandwidth allocation and renewal of dual variables.During the algorithm,firstly it updates the dual variables by using the sub-gradient algorithm after power and bandwidth allocation for the first time.Then it redistributes the power and bandwidth until the dual variables is convergent.By using the joint algorithm proposed,it can guarantee the result is the optimal solution.Simulation results show the performance of the system is improved compared with the existing algorithms.

Key words: satellite communication system, multi-beam, inter-beam interference, resource allocation, joint allocation, convex optimization

中图分类号: 

• TN927