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Mitigating channel fading and transceiver impairments are desirable forhigh-speed terahertz (THz) wireless links. This paper analyzes the performanceof a multi-antenna THz wireless system by considering the combined effect ofpointing errors and fluctuating two-ray (FTR) fading model. We provide astatistical characterization of the maximal ratio combining (MRC) receiver overindependent and nonidentical (i.ni.d.) channel conditions in terms ofmulti-variate Fox's H by deriving density and distribution functions of thesignal-to-noise ratio (SNR) of a single-link THz link using incomplete Gammafunction. We develop exact analytical expressions of outage probability,average bit-error-rate (BER), and ergodic capacity for both single-antenna andMRC receivers. We also present the diversity order of the system by derivingasymptotic expressions for outage probability and average BER at high SNR toobtain insights into the system performance. We validate our derived analyticalexpressions with Monte-Carlo simulations and demonstrate the effect of varioussystem and channel parameters on the performance of single and multi-antennaTHz wireless communications.

Terahertz Wireless Transmissions with Maximal Ratio Combining over Fluctuating Two-Ray Fading