  Previous studies on the temporal characteristics of single-scatter
transmission in non-line-of-sight (NLOS) ultraviolet communications (UVC) were
based on the prolate-spheroidal coordinate system. In this work, a novel
single-scatter channel impulse response (CIR) model is proposed in the
spherical coordinate system, which is more natural and comprehensible than the
prolate-spheroidal coordinate system in practical applications. Additionally,
the results of the widely accepted Monte-Carlo (MC)-based channel model of NLOS
UVC are provided to verify the proposed single-scatter CIR model. Results
indicate that the computational time costed by the proposed single-scatter CIR
model is decreased to less than 0.7% of the MC-based one with comparable
accuracy in assessing the temporal characteristics of NLOS UVC channels.
