Journal ArticleDOI
BER performance of an optically pre-amplified FSO system under turbulence and pointing errors with ASE noise
TLDR
In this article, the bit error rate (BER) performance of a free space optical (FSO) communication system was evaluated in the presence of amplified spontaneous emission (ASE) noise under weak, moderate to strong, and very strong atmospheric turbulence regimes and PEs.Abstract:
The performance of a free space optical (FSO) communication system is significantly affected by various atmospheric turbulence conditions and pointing errors (PEs) apart from the additive noise, which is assumed to be Gaussian Optical pre-amplifiers are an essential component of FSO systems for improving the receiver sensitivity However, optical pre-amplification results in amplified spontaneous emission (ASE), which dominates the receiver thermal and shot noises The square law photodetection process at the receiver in a FSO system necessitates the consideration of chi-square statistics for the decision variable contrary to the Gaussian approximation that is widely used in the literature In this paper, we evaluate the bit error rate (BER) performance of a FSO system assuming non-return-to-zero on–off keying modulation in the presence of ASE noise under weak, moderate to strong, and very strong atmospheric turbulence regimes and PEs We also derive asymptotic BER expressions for the considered FSO system for large values of the signal-to-noise ratio in terms of simple elementary functions Further insight into the system is provided by performing a diversity analysisread more
Citations
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Journal ArticleDOI
Learning-Based Signal Detection for MIMO Systems With Unknown Noise Statistics
TL;DR: This paper aims to devise a generalized maximum likelihood (ML) estimator to robustly detect signals with unknown noise statistics in multiple-input multiple-output (MIMO) systems by proposing a novel ML detection framework driven by an unsupervised learning approach.
Journal ArticleDOI
Performance analysis of all-optical amplify and forward relaying over log-normal FSO channels
TL;DR: A comprehensive analysis of all-optical relaying free space optical systems in the presence of all main noise sources, including background, thermal, and amplified spontaneous emission noise, by considering the effect of the optical degree-of-freedom is proposed.
Journal ArticleDOI
Performance enhancement of the average spectral efficiency using an aperture averaging and spatial-coherence diversity based on the modified-PPM modulation for MISO FSO links
Ebrahim E. Elsayed,Bedir Yousif +1 more
TL;DR: In this paper, the authors proposed a hybrid MPPM/SPPM modulation to improve the average spectral efficiency (ASE) of free-space optical (FSO) communication links using the modified pulse-position modulation (MPPM) and spatial pulse position modulation (SPPM).
Journal ArticleDOI
Performance Comparison of All-Optical Amplify-and-Forward Relaying FSO Communication Systems With OOK and DPSK Modulations
TL;DR: In this article, the authors performed simulations and experiments on a dual-hop free-space optical (FSO) communication system with on-off keying (OOK) and differential phase-shift keying signals, focusing on the receiving sensitivity loss (RSL).
Journal ArticleDOI
Performance of M-PAM FSO communication systems in atmospheric turbulence based on APD detector
Haifeng Yao,Ni Xiaolong,Chunyi Chen,Bo Li,Xinmeng Zhang,Yi Liu,Shoufeng Tong,Zhi Liu,Jiang Huilin +8 more
TL;DR: The numerical results show that the 4-PAM free-space optical (FSO) communication is suitable for medium-to-weak turbulence, and the high gain of APD can mitigate the influence of ABER.
References
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Journal ArticleDOI
Urban optical wireless communication networks: the main challenges and possible solutions
Debbie Kedar,Shlomi Arnon +1 more
TL;DR: Some of the exciting new research approaches that have been suggested to deal with UOWC issues are presented, including optimization of telescope gain, new technologies for pointing systems, and solutions at the network level.
Journal ArticleDOI
On the bit error rate of lightwave systems with optical amplifiers
Pierre A. Humblet,Murat Azizoglu +1 more
TL;DR: In this paper, the performance of optical amplifiers and a wideband optical filter is evaluated in the presence of spontaneous noise and photodetector shot noise and compared with those predicted by Gaussian approximations for amplitude shift keying (ASK), Frequency Shift Kening (FSK), or differential phase shift keening (DPSK) modulations.
Journal ArticleDOI
BPSK Subcarrier Intensity Modulated Free-Space Optical Communications in Atmospheric Turbulence
TL;DR: In this paper, the error performance of the FSO using a subcarrier intensity modulation (SIM) based on a binary phase shift keying (BPSK) scheme in a clear but turbulent atmosphere is presented.
Journal ArticleDOI
Part 1: optical communication over the clear turbulent atmospheric channel using diversity
E.J. Lee,Vincent W. S. Chan +1 more
TL;DR: This work derives the outage probability of spatial diversity and time diversity systems that use equal gain combining (EGC), optimal combining, and select-max combining and feels diversity should be considered as one of the system techniques to improve channel performance in clear atmospheric optical channels.
Journal ArticleDOI
Derivation of analytical expressions for the bit-error probability in lightwave systems with optical amplifiers
TL;DR: In this article, the authors derived the bit-error probability for a lightwave communications system using an amplitude-shift-keying (ASK) pulse modulation format and employing optical amplifiers such that amplified spontaneous emission noise dominates all other noise sources.