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

Hongxin Lin, Yuanjian Li*, Guanghui Chen, Zening Liu, Yongming Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)1181-1185
Number of pages5
JournalIEEE Communications Letters
Volume29
Issue number6
DOIs
Publication statusAccepted/In press - 2025

Keywords

  • adaptive decoding transmission
  • fluctuating two-ray fading
  • millimeter wave cell-free network
  • performance analysis
  • Terahertz backhaul

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