On the Performance of Multihop THz Wireless System Over Mixed Channel Fading With Shadowing and Antenna Misalignment

Pranay Bhardwaj, S. M. Zafaruddin

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The existing relay-assisted terahertz (THz) wireless system is limited to dual-hop transmission with pointing errors and short-term fading without considering the shadowing effect. This paper analyzes the performance of a multihop-assisted backhaul communication mixed with an access link under the shadowed fading with antenna misalignment errors. We derive novel probability density and distribution functions of the signal-to-noise ratio (SNR) of the multihop link employing channel-assisted (CA) and fixed-gain (FG) amplify-and-forward (AF) relaying for each hop by considering independent but not identically distributed (i.ni.d) α - μ fading channel with pointing errors. We present analytical expressions for the outage probability and average bit-error-rate (ABER) and develop asymptotic analysis in high SNR regime to derive the diversity order for both CA-multihop and FG-multihop backhaul links. We use the derived results of the multihop systems to analyze the statistical performance of the integrated backhaul-access relaying for both uplink and downlink transmission considering the generalized-K shadowed fading model in the access link. We also present exact and asymptotic expressions of the outage probability for the considered mixed system. We perform computer simulations to provide design and deployment aspects of employing multiple relays to enhance THz wireless transmissions.

Original languageEnglish
Pages (from-to)7748-7763
Number of pages16
JournalIEEE Transactions on Communications
Issue number11
StatePublished - 1 Nov 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 1972-2012 IEEE.


  • AF relays
  • average bit error rate
  • multihop relaying
  • outage probability
  • pointing errors
  • shadowing
  • terahertz (THz) communications


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