低轨卫星系统下混合预编码与结合器设计  

Hybrid Precoding and Combiner Design in Low Earth Orbit Satellite Systems

作　　者：王丹[1] 莫刘燕 侯康宁 WANG Dan;MO Liuyan;HOU Kangning(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《小型微型计算机系统》2025年第3期744-750,共7页Journal of Chinese Computer Systems

基　　金：重庆市自然科学基金项目(cstc2021jcyj-msxmX0454)资助.

摘　　要：低轨卫星通信和大规模多输入多输出(MIMO)技术结合可以实现显著的频谱和能量效率(EE)增益,但传统的预编码和结合器设计可能导致高实现复杂度或高能量消耗.本文对在大规模MIMO低轨卫星系统下提高能量效率的低分辨率移相器混合预编码器和组合器的设计进行了研究.首先公式化能量效率最大化优化问题,该公式为非凸的,为了易于处理,利用遍历和率的封闭形式的紧上界来近似混合预编码设计的能量效率最大化问题.为解决该问题,提出了一种迭代算法,该算法连续地利用迭代相位匹配算法设计各用户的低分辨率模拟预编码器和组合器对,然后基于获得的有效基带信道计算数字预编码器和组合器,并利用LUP算法来降低矩阵求逆的算法复杂度.仿真结果表明,与基线方案相比,所提算法具有更好的性能,其能量效率更接近最优数字预编码方案.The combination of low orbit satellite communication and large-scale multiple input multiple output(MIMO)technology can achieve significant spectrum and energy efficiency(EE)gains,but traditional precoding and combiner designs may lead to high implementation complexity or energy consumption.This article investigates the design of a low resolution phase shifter hybrid precoder and combiner for improving energy efficiency in large-scale MIMO low orbit satellite systems.Firstly,the optimization problem of maximizing energy efficiency is formulated,which is non convex.For ease of processing,the closed form tight upper bound of ergodic sum rate is used to approximate the energy efficiency maximization problem of hybrid precoding design.To solve this problem,an iterative algorithm was proposed,which continuously utilizes iterative phase matching algorithms to design low resolution analog pre encoders and combiners for each user.Then,based on the obtained effective baseband channels,digital pre encoders and combiners are calculated,and the LUP algorithm is used to reduce the algorithm complexity of matrix inversion.The simulation results show that the proposed algorithm has better performance compared to the baseline scheme,and its energy efficiency is closer to the optimal digital precoding scheme.

关 键 词：低轨卫星 混合预编码 大规模MIMO 能量效率 移相器 

分 类 号：TP927[自动化与计算机技术]