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流体天线辅助MU-MIMO网络中的联合波束成形与天线位置优化

Joint Beamforming and Antenna Position Optimization for Fluid Antenna-Assisted MU-MIMO Networks

The Hong Kong University of Science and Technology (HKUST)(香港科技大学);Southeast University(东南大学)

Tianyi Liao, Wei Guo, Hengtao He, Shenghui Song, Jun Zhang, Khaled B. Letaief

AI总结:

针对流体天线辅助MU-MIMO网络,提出联合优化波束成形与天线位置以最大化加权和速率的方法,采用块坐标上升和并行MM算法,并实现去中心化以降低计算复杂度,显著提升性能。

摘要:

流体天线系统(FAS)是未来无线通信网络的一项颠覆性技术。本文研究了流体天线(FA)辅助的多用户多输入多输出(MU-MIMO)网络中,面向加权和速率(WSR)最大化的波束成形矩阵与天线位置的联合优化问题。由于波束成形与FA位置之间的强耦合、WSR目标函数的非凹性以及高计算复杂度,该问题具有显著挑战性。为应对这些挑战,我们首先提出了一种基于块坐标上升(BCA)的新方法,利用矩阵分式规划技术将原始复杂问题重构为更易处理的形式。随后,我们开发了一种并行最大化-最小化(MM)算法,能够同时优化所有FA位置。为进一步降低计算成本,我们提出了一种基于去中心化基带处理(DBP)架构的去中心化实现方案。仿真结果表明,与传统MIMO网络相比,我们提出的算法不仅实现了显著的WSR提升,而且优于现有方法。此外,与集中式实现相比,去中心化实现大幅减少了计算时间,同时保持了相似的性能。

英文摘要:

The fluid antenna system (FAS) is a disruptive tech-nology for future wireless communication networks. This paper considers the joint optimization of beamforming matrices and antenna positions for weighted sum rate (WSR) maximization in fluid antenna (FA)-assisted multiuser multiple-input multiple-output (MU-MIMO) networks, which presents significant chal-lenges due to the strong coupling between beamforming and FA positions, the non-concavity of the WSR objective function, and high computational complexity. To address these challenges, we first propose a novel block coordinate ascent (BCA)-based method that employs matrix fractional programming techniques to reformulate the original complex problem into a more tractable form. Then, we develop a parallel majorization maximization (MM) algorithm capable of optimizing all FA positions simul-taneously. To further reduce computational costs, we propose a decentralized implementation based on the decentralized base-band processing (DBP) architecture. Simulation results demon-strate that our proposed algorithm not only achieves significant WSR improvements over conventional MIMO networks but also outperforms the existing method. Moreover, the decentralized implementation substantially reduces computation time while maintaining similar performance compared with the centralized implementation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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