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In this paper, we consider a dual-hop mixed THz-RF system model forbackhaul-fronthaul applications where the link between source and destinationis established only through the relay node in which decode-and-forward relayingprotocol is used. The THz link suffers from the joint impact of antennamisalignment and stochastic characteristics of wireless channels, including theeffect of environmental conditions such as pressure, humidity, and temperature.The envelope of THz link in the first hop follows a generalized $\alpha-\mu$distribution, and for the RF end, the Nakagami-$m$ distribution is considered.In this context, we obtain new closed-form expressions of the cumulativedensity function and the moment-generating function of the end-to-endsignal-to-noise ratio. Further, we derive the average symbol error rateexpressions for coherent rectangular quadrature amplitude modulation (RQAM) andcoherent hexagonal QAM (HQAM), as well as the non-coherent modulation scheme.The asymptotic behavior is also discussed to examine the system's diversity.Furthermore, the impact of several parameters, such as fading coefficients ofindividual links and antenna misalignment, as well as the distance betweennodes, are also highlighted in the system's performance. Moreover, Monte Carlosimulations are used to validate the presented analytical framework. Finally,the presented numerical insights aid in the extraction of practical designprinciples.

New Closed-Form ASER Expressions for Dual-Hop Mixed THz-RF Cooperative Relay Networks