Outage Capacity With Non-Uniform Signaling For Free-Space Optical Channels

The outage capacity of slow-fading free-space optical (FSO) channels is derived with pulse amplitude modulation (PAM) signaling. Both uniform and non-uniform discrete input distributions are considered. For practical implementation, a nonuniform distribution with quantized-level probabilities is proposed. The combined effects of atmospheric turbulence, pointing errors and transmitter beamwidth are considered in the analysis. An upper and …