Different Modulation Schemes Employed in Free Space Optical Communication Systems

Le résumé fourni par la source

Numerous modulation schemes are used in free space optical (FSO) transmission, including Phase Shift Keying (PSK), Orthogonal Frequency Division Multiplexing (OFDM), Space Shift Keying (SSK), Pulse Position Modulation (PPM), Gaussian Minimum Shift Keying (GMSK), and Subcarrier Intensity Modulation (SIM). By changing the phase of digital data, PSK changes the spectrum into orthogonal subcarriers, OFDM changes the beam’s location, PPM changes the positions of pulses, GMSK uses a Gaussian filter to smooth phase shifts, and SIM changes the amplitude of subcarriers. Each scheme is designed to optimally handle different transmission situations, balancing data rate and reliability based on factors like system complexity, available bandwidth, and the state of the atmosphere.

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