  We propose pulse laser-based ultra-violet communication over long distance,
such that the pulse response signals can be detected at the receiver at the
cost of low data transmission rate. We characterize the signal and achievable
performance for the pulse laser-based communication. Since the detection
performance critically depends on the pulse response position estimation, we
also propose two approaches to estimate the pulse response positions, one based
on counting the number pulses in a window, and the other based on the
correlation of pulse response shape and the number of detected photoelectrons.
It is seen that the correlation-based position estimation approach can achieve
more accurate estimation compared with the counting-based one.
