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Mitigating channel fading and transceiver impairments are desirable for high-speed terahertz (THz) wireless links. This paper analyzes the performance of a multi-antenna THz wireless system by considering the combined effect of pointing errors and fluctuating two-ray (FTR) fading model. We provide a statistical characterization of the maximal ratio combining (MRC) receiver over independent and nonidentical (i.ni.d.) channel conditions in terms of multi-variate Fox's H by deriving density and distribution functions of the signal-tonoise ratio (SNR) of a single-link THz link using incomplete Gamma function. We develop exact analytical expressions of outage probability, average bit-error-rate (BER), and ergodic capacity for both single-antenna and MRC receivers. We also present the diversity order of the system by deriving asymptotic expressions for outage probability and average BER at high SNR to obtain insights into the system performance. We validate our derived analytical expressions with Monte-Carlo simulations and demonstrate the effect of various system and channel parameters on the performance of single and multi-antenna THz wireless communications.Index Terms-Beyond 5G/6G wireless systems, fluctuating two ray, performance analysis, pointing error, maximal ratio combining, probability distribution function, terahertz communication. I. INTRODUCTIONTerahertz (THz) wireless is an upcoming technology to provide new spectrum resources for future communication systems. The availability of contiguous high bandwidth transmissions in the THz spectrum can be potential for wireless backhaul/fronthaul technology [1]- [3]. The THz spectrum is mostly unlicensed and can support secured terabits per second (Tbps) data transmissions with low latency for various highend applications. The line-of-sight (LOS) THz technology requires high directional antennas with higher gain to compensate for severe path loss due to the molecular absorption of transmitted signals. Nevertheless, the THz link is susceptible to the random pointing errors caused by the misalignment between transmitter and receiver antenna beams and may incur transceiver distortion at higher frequencies in addition to the stochastic multi-path fading [4]- [7]. Alleviating the adverse effects of signal attenuation and fading is desirable for highspeed THz links.Recently, dual-hop and multi-hop relaying at THz frequencies have been investigated [8]- [16]. More specifically, the authors in [8] formulated an optimal relaying distance for THzband communication to maximize the network throughput.

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