Optimal Feedback Bit Allocation for MU-MIMO Systems Combined With OFDM in Cellular Networks

IF 7.1 2区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Vehicular Technology Pub Date : 2025-01-14 DOI:10.1109/TVT.2025.3528756

Jeongbin Kim;Moonsik Min

引用次数: 0

Abstract

In this correspondence, we investigate the performance of multiuser multiple-input and multiple-output (MU-MIMO) systems in cellular networks using Poisson point process (PPP) models. Focusing on limited-feedback-based MU-MIMO combined with orthogonal frequency division multiplexing (OFDM), we aim to maximize the sum rate of users in wide-band cellular networks. To achieve this, we formulate a centralized feedback bit allocation problem and propose an approximation for the instantaneous signal-to-interference-plus-noise ratio (SINR), as it is difficult to obtain accurately at the transmitter. Using Karush-Kuhn-Tucker (KKT) conditions, we derive closed-form solutions for optimal feedback bit allocation. Our results demonstrate significant performance improvements compared to conventional equal feedback bit allocation, providing practical insights for enhancing the spectral efficiency of wideband communication systems in cellular networks.

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蜂窝网络中结合OFDM的MU-MIMO系统的最优反馈位分配

在本通信中，我们使用泊松点过程（PPP）模型研究了蜂窝网络中多用户多输入多输出（MU-MIMO）系统的性能。以基于有限反馈的MU-MIMO与正交频分复用（OFDM）相结合为研究重点，以实现宽带蜂窝网络中用户总速率的最大化为目标。为了实现这一目标，我们制定了一个集中反馈位分配问题，并提出了瞬时信噪比（SINR）的近似，因为它很难在发射机上准确获得。利用Karush-Kuhn-Tucker （KKT）条件，我们得到了最优反馈位分配的闭型解。与传统的等反馈比特分配相比，我们的研究结果显示了显著的性能改进，为提高蜂窝网络中宽带通信系统的频谱效率提供了实用的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Vehicular Technology 工程技术-电信学

CiteScore

6.00

自引率

8.80%

发文量

1245

审稿时长

6.3 months

期刊介绍： The scope of the Transactions is threefold (which was approved by the IEEE Periodicals Committee in 1967) and is published on the journal website as follows: Communications: The use of mobile radio on land, sea, and air, including cellular radio, two-way radio, and one-way radio, with applications to dispatch and control vehicles, mobile radiotelephone, radio paging, and status monitoring and reporting. Related areas include spectrum usage, component radio equipment such as cavities and antennas, compute control for radio systems, digital modulation and transmission techniques, mobile radio circuit design, radio propagation for vehicular communications, effects of ignition noise and radio frequency interference, and consideration of the vehicle as part of the radio operating environment. Transportation Systems: The use of electronic technology for the control of ground transportation systems including, but not limited to, traffic aid systems; traffic control systems; automatic vehicle identification, location, and monitoring systems; automated transport systems, with single and multiple vehicle control; and moving walkways or people-movers. Vehicular Electronics: The use of electronic or electrical components and systems for control, propulsion, or auxiliary functions, including but not limited to, electronic controls for engineer, drive train, convenience, safety, and other vehicle systems; sensors, actuators, and microprocessors for onboard use; electronic fuel control systems; vehicle electrical components and systems collision avoidance systems; electromagnetic compatibility in the vehicle environment; and electric vehicles and controls.

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