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arXiv 2401.02701cs.ITeess.SPmath.IT
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无蜂窝大规模MIMO中的联合用户关联与功率控制

Joint User Association and Power Control for Cell-Free Massive MIMO

Chongzheng Hao, Tung Thanh Vu, Hien Quoc Ngo, Minh N. Dao, Xiaoyu Dang, Chenghua Wang, Michail Matthaiou

AI总结:

针对以用户为中心的CFmMIMO网络,本文联合优化UE关联与功率控制以最大化和SE,并按系统规模提出JointCFNet、SCA与低复杂度APG算法,显著降低运行时间且性能优越。

摘要:

本工作提出了在下行链路以用户为中心的无蜂窝大规模多输入多输出(CFmMIMO)网络中联合设计用户设备(UE)关联和功率控制(PC)的新颖方法,其中每个UE仅由一组接入点(AP)服务,以减少前传信令和计算复杂度。为了最大化UE的和频谱效率(SE),我们在每AP发射功率、服务质量速率要求、最大前传信令负载以及每个AP所服务UE的最大数量等约束下,构建了一个混合整数非凸优化问题。为了高效求解所构建的问题,我们根据CFmMIMO系统的不同规模提出了两种不同方案。对于小规模CFmMIMO系统,我们提出了一种连续凸逼近(SCA)方法以获得平稳解,并开发了一种基于学习的方法(JointCFNet)来降低计算复杂度。对于大规模CFmMIMO系统,我们利用加速投影梯度(APG)技术提出了一种低复杂度次优算法。数值结果表明,在小规模系统中,我们的JointCFNet能够产生与SCA算法相近的性能,并显著减少运行时间。所提出的APG方法被证实在大规模系统中运行速度远快于SCA算法,同时获得接近SCA方法的SE性能。此外,APG方法的中位数和SE比启发式基线方案高出约2.8倍。

英文摘要:

This work proposes novel approaches that jointly design user equipment (UE) association and power control (PC) in a downlink user-centric cell-free massive multiple-input multiple-output (CFmMIMO) network, where each UE is only served by a set of access points (APs) for reducing the fronthaul signalling and computational complexity. In order to maximize the sum spectral efficiency (SE) of the UEs, we formulate a mixed-integer nonconvex optimization problem under constraints on the per-AP transmit power, quality-of-service rate requirements, maximum fronthaul signalling load, and maximum number of UEs served by each AP. In order to solve the formulated problem efficiently, we propose two different schemes according to the different sizes of the CFmMIMO systems. For small-scale CFmMIMO systems, we present a successive convex approximation (SCA) method to obtain a stationary solution and also develop a learning-based method (JointCFNet) to reduce the computational complexity. For large-scale CFmMIMO systems, we propose a low-complexity suboptimal algorithm using accelerated projected gradient (APG) techniques. Numerical results show that our JointCFNet can yield similar performance and significantly decrease the run time compared with the SCA algorithm in small-scale systems. The presented APG approach is confirmed to run much faster than the SCA algorithm in the large-scale system while obtaining an SE performance close to that of the SCA approach. Moreover, the median sum SE of the APG method is up to about 2.8 fold higher than that of the heuristic baseline scheme.

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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