Performance Analysis for mmWave Cell-Free Access Network Based on Terahertz Backhaul

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-03-28 DOI:10.1109/LCOMM.2025.3555748

Hongxin Lin;Yuanjian Li;Guanghui Chen;Zening Liu;Yongming Huang

引用次数: 0

Abstract

This letter proposes a downlink cell-free massive multiple-input multiple-output (CF-mMIMO) network architecture integrating terahertz (THz) backhaul and millimeter wave (mmWave) access, where a source server transmits signals to the central processing unit (CPU) via THz links, then enabling adaptive decode-and-forward transmission to multiple fiber-connected mmWave access points (APs). A novel fluctuating two-ray (FTR) fading model is adopted to characterize mmWave links for accurate performance analysis. Closed-form expressions for outage probability and ergodic capacity are derived for maximum ratio combining (MRC) receivers, complemented by asymptotic analysis in high signal-to-noise ratio (SNR) regimes. Extensive simulations validate the analytical results and demonstrate a critical trade-off: while increasing the number of APs yields marginal outage probability improvement due to THz backhaul limitations, it substantially enhances ergodic capacity through effective spatial multiplexing.

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基于太赫兹回程的毫米波无蜂窝接入网性能分析

这封信提出了一种无下行单元的大规模多输入多输出（CF-mMIMO）网络架构，集成了太赫兹（THz）回程和毫米波（mmWave）访问，其中源服务器通过太赫兹链路将信号传输到中央处理单元（CPU），然后实现自适应解码和转发传输到多个光纤连接的毫米波接入点（ap）。为了准确分析毫米波链路的性能，采用了一种新的波动双射线（FTR）衰落模型。导出了最大比组合（MRC）接收机的中断概率和遍历容量的封闭表达式，并在高信噪比（SNR）条件下进行了渐近分析。大量的模拟验证了分析结果，并证明了一个关键的权衡：虽然由于太赫兹回程的限制，增加ap的数量会产生边际中断概率的改善，但它通过有效的空间复用大大提高了遍历能力。

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 Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. 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 communication systems.