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The performance of a satellite-to-ground optical communication system with phase modulation is limited by phase fluctuations induced by atmospheric turbulence. To improve the system performance, one effective way is to use coherent detection. In this paper, a satellite-to-ground coherent optical communication system with differential quadrature phase-shift keying (DQPSK) modulation is studied, and...
The performance of a free-space optical (FSO) communication system is limited by light intensity fluctuations induced by atmospheric turbulence. To improve the system performance, one effective way is to use forward error correction (FEC). Pulse position modulation (PPM) is a power- efficient modulation scheme employed in FSO systems. So this paper evaluates the performance improvement of an FSO system...
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