Research on free-space optical communication system for OFDM serial relay based on exponentiated Weibull turbulence model

摘要

The performance of a decode-and-forward (DF) serial relay OFDM free-space optical (FSO) communication system with exponentiated Weibull (EW) distribution is investigated in this paper. Considering that the optical signal propagation in free space is affected by a variety of destructive effects such as atmospheric turbulence, fog, path loss and pointing error, the closed expression of system outage probability and symbol error rate is derived using the Meijer G function respectively. The effects of key factors such as the number of different relay nodes, weather conditions, link length between relays, and number of subcarriers on the outage and symbol error rate performance of the serial relay OFDM FSO system are analyzed by simulation. The results show that the system's performance decreases with the increase of the distance between relays, and the communication will be interrupted in foggy days.