  Small-cell cellular base stations are going to be used for mmWave and sub-THz
communication systems to provide multi-Gbps data rates and reliable coverage to
mobile users. This paper analyzes the base station coverage of sub-THz
communication systems and the system performance in terms of spectral
efficiency through Monte Carlo simulations for both single-cell and multi-cell
cases. The simulations are based on realistic channel models derived from
outdoor field measurements at 142 GHz in urban microcell (UMi) environments
conducted in downtown Brooklyn, New York. The single-cell base station can
provide a downlink coverage area with a radius of 200 m and the 7-cell system
can provide a downlink coverage area with a radius of 400 m at 142 GHz. Using a
1 GHz downlink bandwidth and 100 MHz uplink bandwidth, the 7-cell system can
provide about 4.5 Gbps downlink average data rate and 410 Mbps uplink average
data rate at 142 GHz.
