TY - JOUR
TI - Multi-hop DF relayed FSO links with various modulation formats emulated by a dual-hop scheme for strong turbulence conditions
AU - Androutsos, N.A.
AU - Nistazakis, H.E.
AU - Petkovic, M.I.
AU - Djordjevic, G.T.
AU - Stassinakis, A.N.
AU - Volos, C.K.
JO - Optik - International Journal for Light and Electron Optics
PY - 2021
VL - 227
TODO - null
SP - null
PB - Elsevier GmbH
SN - 0030-4026
TODO - 10.1016/j.ijleo.2020.165972
TODO - Atmospheric turbulence;  Estimation;  Turbomachinery, Mathematical complexity;  Mathematical expressions;  Mathematical forms;  Modulation formats;  Negative exponential;  Optical wireless link;  Outage probability;  Pulse amplitude modulations (PAM), Modulation
TODO - In this work, we try to minimize the mathematical complexity in analyzing outage and error performance by emulating multi-hop terrestrial FSO communication system as a single dual-hop scheme. More specifically, we approximate the topology of such a system and we estimate analytically its performance, by taking into account various modulation formats for strong and saturated atmospheric turbulence conditions. The theoretical study of the FSO system performance is performed using either the negative exponential or the K distribution models, while the well-known modulation formats on-off keying (OOK), pulse amplitude modulation (PAM) and pulse position modulation (PPM), have been employed. Thus, closed form mathematical expressions for outage probability and average BER estimation are derived and their outcomes can easily be used for the design of modern optical wireless links. Finally, using the obtained mathematical forms, the corresponding numerical results are presented using realistic FSO parameter values. © 2020 Elsevier GmbH
ER -