Abstract
In the recent years, Free Space Optics (FSO) technology has attracted significant research and commercial interest mostly because of its many advantages in comparison with other radio systems used for point-to-point connections. However, the reliable operation of these systems significantly depends on the conditions of the atmosphere in the area in which the optical beam propagates. The most important of these conditions are atmospheric turbulence and the misalignment between the optical beam and the receiver, which is also known as the pointing errors effect. In this work, in order to obviate the performance mitigation caused by these phenomena, we examined the most widely accepted and one of the most effective techniques, i.e., the implementation of receivers’ diversity. Various metrics have been investigated to evaluate the performance of such systems, but most of them do not take into account that the ultra-fast modern optical communication systems use blocks of bits for the transmission and codes for the detection and/or correction of erroneous bits. Thus, by taking these aspects into account, in this work, we investigated the combined impact of spatial jitter and atmospheric turbulence on the total average block error rate of an optical wireless system with receivers’ diversity. Novel closed-form analytical formulas were derived.
Highlights
Over the last few years, Free Space Optics (FSO) technology has raised significant scientific interest for experimental, theoretical, and commercial purposes, mostly because of its many advantages in comparison with other techniques such as those based on Radio Frequency (RF) systems for point-to-point (P2P) or point-to-multipoint applications
The implementation of diversity mentioned to the transmission of many copies of the same signal from a transmitter towards one or multiple receivers, so as to be maintained the required performance level of the FSO during a poor propagation of the laser beam through the atmosphere, [1]; this configuration works as a single-input multipleoutput (SIMO) scheme
The remainder of this work is organized as follows: in Section 2, we introduce the system under investigation and the model of the channel considering the joint influence of scintillation and spatial jitter, while in Section 3, the total average Block Error Rate (ABLER) of the SIMO FSO system is investigated
Summary
Over the last few years, FSO technology has raised significant scientific interest for experimental, theoretical, and commercial purposes, mostly because of its many advantages in comparison with other techniques such as those based on Radio Frequency (RF) systems for point-to-point (P2P) or point-to-multipoint applications. The implementation of diversity mentioned to the transmission of many copies of the same signal from a transmitter towards one or multiple receivers, so as to be maintained the required performance level of the FSO during a poor propagation of the laser beam through the atmosphere, [1]; this configuration works as a single-input multipleoutput (SIMO) scheme. This technique may be generally implemented in terms of space, time, or wavelength [1,16,17,18]. Where It,d and Ip,d are the values of irradiance due to scintillation and spatial jitter for each one of the D receivers, respectively, and Il,d represents the parameter of path losses which is deterministic and, without loss of generality, has been considered normalized to unity [1,3]
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