Research and Simulation of PPM Modulation and Demodulation System on Spatial Wireless Optical Communication

For the development of the information age, it needs to establish high transmission rate, great information, wide covering space communication network systems. The space-satellite communication using the extremely short wave length light wave is the best plan to realize the high code rate communication. High code rate modulation is one of the key technologies to realize free-space optical communication system. The free-space optical communication system wants to realize high-power and wide range of communication which requires high-rate modulation laser transmitter. PPM (Pulse Position Modulation) has been widely used in free-space optical communication system because of its advantages such as high power efficiency, transmission efficiency and strong anti-jamming capability.