低轨卫星MIMO通信系统联合姿态与预编码优化

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Wireless Communications Letters Pub Date : 2025-03-02 DOI:10.1109/LWC.2025.3566489

Mingyuan Hui;Qiucen Wu;Yu Zhu

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引用次数: 0

摘要

在这封信中，我们研究了低地球轨道（LEO）卫星多用户通信的波束形成优化，其中卫星姿态被视为一个额外的调谐变量，以减轻天线非全向辐射方向图引起的性能下降。通过揭示低轨卫星姿态旋转矩阵与卫星-用户收发信号模型之间的关系，提出了一种新的联合姿态和预编码优化（JAPO）方法，以最大化低轨卫星通信系统的和速率。具体地说，我们利用零强迫预编码器对波束功率分配和卫星姿态进行交替优化。在卫星姿态优化中，将涉及复杂旋转矩阵的棘手问题进行简化，然后采用流形优化方法求解。仿真结果表明，与基线方法相比，所提出的JAPO方法在不同发射功率预算、用户数量和天线阵列尺寸下均能保持较高的和速率，同时收敛速度快，从而突出了联合优化卫星姿态和预编码的优势。

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Joint Attitude and Precoding Optimization for LEO Satellite MIMO Communication Systems

In this letter, we investigate the beamforming optimization for low Earth orbit (LEO) satellite multi-user communication, where the satellite attitude is regarded as an additional tuning variable to mitigate the performance degradation caused by the non-omnidirectional radiation pattern of the antenna. By revealing the relationship between the LEO satellite attitude rotation matrix and the satellite-user transceiving signal model, we propose a novel joint attitude and precoding optimization (JAPO) method to maximize the sum rate of the LEO satellite communication system. Specifically, by utilizing a zero-forcing precoder, we optimize the beam power allocation and the satellite’s attitude with alternating optimization. In the optimization of the satellite’s attitude, we simplify the intractable problem related to the complex rotation matrix and then apply manifold optimization to solve it. Simulation results demonstrate that, compared to the baseline method, the proposed JAPO method consistently achieves higher sum rates across varying transmit power budgets, user numbers, and antenna array sizes, while converging rapidly, thereby highlighting the benefits of jointly optimizing the satellite’s attitude and precoding.

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来源期刊

IEEE Wireless Communications Letters Engineering-Electrical and Electronic Engineering

CiteScore

12.30

自引率

6.30%

发文量

481

期刊介绍： IEEE Wireless Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of wireless communications. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of wireless communication systems.