MIMO-FSO communication with Hybrid Modulation. Mixed modulation in free space optics

      Аннотация: The MIMO technique in wireless communication systems is widely used because it provides huge data throughput and increased link range without the addition of neither bandwidth nor transmitted power. However, this technology has demerits as well, in which transmission is affected badly due to attenuation of the signal. Attenuation arises when the atmosphere is cloudy, foggy, dusty, and rainy outside. There are few challenges in FSO links such as channel randomness, PAT (Pointing, Acquisition & Tracking), fading, etc. which makes the system performance low. To overcome these statistical channel modeling with various fading factors, omnidirectional control channel, spatial diversity techniques, RF/FSO hybrid architecture and advanced components respectively play a vital role to improve the performance of the system. In this book, a system is proposed to investigated the implementation of hybrid modulation (NRZ, DQPSK, and Polsk) for a range of 1 km at frequency 193.1 THz over FSO channel (under various atmospheric conditions) by using SISO/MIMO-FSO technique.

Ключевые слова: Free Space Optics, MIMO, Hybrid Modulation, Attenuation, Q-factor