| Abstract: | The average bit-error rate(ABER) performance of free-space optical(FSO) communication links is investigated for space-shift keying(SSK) over log-normal and negative-exponential atmospheric turbulence channels. SSK is compared with repetition codes and a single-input single-output system using multiple pulse amplitude modulations. Simulation results show that the signal-to-noise ratio gain of SSK largely increases with greater spectral efficiencies and/or higher turbulence effects. A tight bound for ABER is derived based on an exact moment generation function(MGF) for negative-exponential channel and an approximate MGF for log-normal channel.Finally, extensive Monte Carlo simulations are run to validate the analytical analysis. |
