Fixed-Gain AF Relaying for RF-THz Wireless System Over α-κ-μ Shadowed and α-μ Channels

Pranay Bhardwaj, S. M. Zafaruddin

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Recent research investigates the decode-and-forward (DF) relaying for mixed radio frequency (RF) and terahertz (THz) wireless links with zero-boresight pointing errors. We analyze the performance of a fixed-gain amplify-and-forward (AF) relaying for the RF-THz link to interface the access network on the RF technology with wireless THz transmissions. We develop probability density function (PDF) and cumulative distribution function (CDF) of the end-to-end SNR for the relay-assisted system in terms of bivariate Fox's H function considering α - μ fading for the THz system with non-zero boresight pointing errors and α - κ - μ shadowed ( α -KMS) fading model for the RF link. Using the derived PDF and CDF, we present exact analytical expressions of the outage probability, average bit-error-rate (BER), and ergodic capacity of the considered system. We also analyze the outage probability and average BER asymptotically for a better insight into the system behavior at high SNR. We use simulations to compare the performance of the AF relaying having a semi-blind gain factor with the recently proposed DF relaying for THz-RF transmissions.

Original languageEnglish
Pages (from-to)999-1003
Number of pages5
JournalIEEE Communications Letters
Issue number5
StatePublished - 1 May 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
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  • Amplify-and-forward
  • DF
  • bit-error-rate
  • ergodic capacity
  • performance analysis
  • pointing errors
  • terahertz


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