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Recent research investigates the decode-and-forward (DF) relaying for mixedradio frequency (RF) and terahertz (THz) wireless links with zero-boresightpointing errors. In this letter, we analyze the performance of a fixed-gainamplify-and-forward (AF) relaying for the RF-THz link to interface the accessnetwork on the RF technology with wireless THz transmissions. We developprobability density function (PDF) and cumulative distribution function (CDF)of the end-to-end SNR for the relay-assisted system in terms of bivariate Fox'sH function considering $\alpha$-$\mu$ fading for the THz system with non-zeroboresight pointing errors and $\alpha$-$\kappa$-$\mu$ shadowed ($\alpha$-KMS)fading model for the RF link. Using the derived PDF and CDF, we present exactanalytical expressions of the outage probability, average bit-error-rate (BER),and ergodic capacity of the considered system. We also analyze the outageprobability and average BER asymptotically for a better insight into the systembehavior at high SNR. We use simulations to compare the performance of the AFrelaying having a semi-blind gain factor with the recently proposed DF relayingfor THz-RF transmissions.

Fixed-Gain AF Relaying for RF-THz Wireless System over $\alpha$-$\kappa$-$\mu$ Shadowed and $\alpha$-$\mu$ Channels