  Line-of-sight (LOS) wireless communication at terahertz (THz) frequency bands
is envisioned to play a major role in defining next-generation wireless
technologies. This work analyzes the performance of a potential LOS THz system
experiencing propagation loss and misaligned antenna beams. The THz channel
particularities are discussed in terms of deterministic path loss, molecular
absorption effect and stochastic fading due to antenna pointing errors.
Assuming phase shift keying (PSK) modulation schemes, simplified analytical
expressions are approximated for computing symbol error rate (SER) of the
proposed THz system. Monte Carlo simulations are applied to verify theoretical
model accuracy over various transmission distances and misalignment scenarios.
The derived SER formulas match simulation results for Signal-to-noise ratio
(SNR) above 35 dB at transmission distance up to 100 m and antenna displacement
jitter variance of 0.05 $m^2$. In general, the theoretical model mismatch does
not exceed 2 dB for lower SNR levels.
