Free Space Optical (FSO) Communication Systems are wireless systems capable of providing high speed, secure and cost effective communication between two entities. The channel for FSO is expressed in terms of the Malaga-distribution model. It is a generalized channel model encompassing all the channel conditions and previous models. In this work, the performance of a Subcarrier Intensity Modulation FSO system is analyzed by considering the ill effects channel turbulence and pointing error and derived a closed form analytical expression for bit error rate and channel capacity. The results demonstrate the performance deterioration the system suffers because of the channel and also how the m-distribution model can be used to obtain the performance over other FSO channels.
This study focuses on the analysis of a decode-and-forward relay-based asymmetric radio frequency-free space optical (RF-FSO) communication system. These types of communication systems are of very high speed, secure, and costeffective. Such systems can be used to provide the last-mile access to many household users and can provide temporary network access during disasters and link failures. In the communication model analysed, the RF path is considered as Rayleigh fading, and the FSO path is considered as Málaga (ℳ)-distributed turbulence fading with the pointing error. Two types of detection schemes consisting of intensity modulation/direct detection and heterodyne detection are considered at the receiver for the analysis. For this cooperative communication system, novel mathematical expressions for the cumulative distribution function, probability density function, and moment generating function of the end-to-end signal-to-noise ratio are derived. With the aid of these statistical characteristics, new closed mathematical formulations are obtained for outage probability and the average bit error rate for different binary and M-ary modulation approaches.
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