Performance of Dual-Hop Relaying for THz-RF Wireless Link over Asymmetrical α μ Fading

Pranay Bhardwaj, S. M. Zafaruddin

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27 Scopus citations


Terahertz (THz) frequency bands can be promising for data transmissions between the core network and access points (AP) for next-generation wireless systems. In this paper, we analyze the performance of a dual-hop THz-RF wireless system where an AP facilitates data transmission between a core network and user equipment (UE). We consider a generalized model for the end-to-end channel with independent and not identically distributed ( fading model for THz and RF links using the α-μ distribution, the THz link with pointing errors, and asymmetrical relay position. We derive a closed-form expression of the cumulative distribution function (CDF) of the end-to-end signal to noise ratio (SNR) for the THz-RF link, which is valid for real-valued μ for a generalized performance analysis over THz fading channels. Using the derived CDF, we analyze the performance of the THz-RF relayed system using decode-and-forward (DF) protocol by deriving closed-form expressions of outage probability, moments of SNR, average BER, and a tight approximation of ergodic capacity in terms of system parameters. We develop asymptotic analysis on the ergodic capacity, outage probability, and average BER in the high SNR region and derive the diversity order of the system. We also analyze the considered system with an i.i.d. model and develop simplified performance to provide insight on the system behavior analytically under various practically relevant scenarios. Simulation and numerical analysis show a significant effect of fading parameters of the THz link and a nominal effect of normalized beam-width on the performance of the relay-assisted THz-RF system.

Original languageEnglish
Pages (from-to)10031-10047
Number of pages17
JournalIEEE Transactions on Vehicular Technology
Issue number10
StatePublished - 1 Oct 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 1967-2012 IEEE.


  • Bit error rate
  • decode and forward
  • diversity order
  • ergodic capacity
  • outage probability
  • performance analysis
  • pointing errors
  • relaying
  • signal to noise ratio
  • terahertz


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