Performance enhancement of the average spectral efficiency using an aperture averaging and spatial-coherence diversity based on the modified-PPM modulation for …

EE Elsayed, BB Yousif - Optics Communications, 2020 - Elsevier
The performance evaluation and enhancement of the proposed model for a free-space
optical (FSO) communication links using the modified pulse-position modulation (MPPM) …

Performance enhancement of M-ary pulse-position modulation for a wavelength division multiplexing free-space optical systems impaired by interchannel crosstalk …

EE Elsayed, BB Yousif - Optics Communications, 2020 - Elsevier
The performance evaluations and enhancements of wavelength-division-multiplexing
(WDM) for the free-space optical (FSO) communication systems using a digital pulse …

Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors

T Ismail, E Leitgeb, Z Ghassemlooy… - IET networks, 2018 - Wiley Online Library
Free space optics (FSO) communication links are impaired by the fading due to turbulence
and misalignment. In this paper, we theoretically analyze the pointing error effects on …

Performance enhancement of hybrid diversity for M-ary modified pulse-position modulation and spatial modulation of MIMO-FSO systems under the atmospheric …

EE Elsayed, BB Yousif - Optical and Quantum Electronics, 2020 - Springer
In this paper, we propose a novel model for hybrid spatial diversity of M-ary pulse position
modulation (M-ary PPM) and spatial modulation (SM) with a multiple-input multiple-output …

BER analysis of a hybrid modulation scheme based on PPM and MSK subcarrier intensity modulation

H Liu, R Liao, Z Wei, Z Hou, Y Qiao - IEEE Photonics Journal, 2015 - ieeexplore.ieee.org
In order to improve the bit-error-rate (BER) performance of free-space optical (FSO)
communication systems employing binary phase-shift keying subcarrier intensity modulation …

Performance analysis of a hybrid QAM-MPPM technique over turbulence-free and gamma–gamma free-space optical channels

HS Khallaf, HMH Shalaby… - Journal of Optical …, 2017 - opg.optica.org
The performance of a hybrid M-ary quadrature amplitude modulation multi-pulse pulse-
position modulation (hybrid QAM-MPPM) technique is investigated in both turbulence-free …

Performance analysis of FSO coherent BPSK systems over Rician turbulence channel with pointing errors

H Zhou, W Xie, L Zhang, Y Bai, W Wei, Y Dong - Optics express, 2019 - opg.optica.org
We investigate the performance of coherent free-space optical (FSO) system in terms of bit
error rate (BER) evaluation by adopting the modified Rician distribution based coherent …

Performance assessment of hybrid PPM–BPSK–SIM based FSO communication system using time and wavelength diversity under variant atmospheric turbulence

K Sharma, SK Grewal - Optical and Quantum Electronics, 2020 - Springer
In this paper, free space optical communication system employing a hybrid modulation
technique called pulse position modulation–binary phase shift keying–subcarrier intensity …

Performance enhancement of DWDM-FSO optical fiber communication systems based on hybrid modulation techniques under atmospheric turbulence channel

MR Hayal, BB Yousif, MA Azim - Photonics, 2021 - mdpi.com
In this paper, we enhance the performance efficiency of the free-space optical (FSO)
communication link using the hybrid on-off keying (OOK) modulation, M-ary digital pulse …

Performance enhancement of hybrid fiber wavelength division multiplexing passive optical network FSO systems using M-ary DPPM techniques under interchannel …

EE Elsayed, BB Yousif, M Singh - Optical and Quantum Electronics, 2022 - Springer
The performance of moment generating function approaches, specifically Chernoff bound
(CB) and modified Chernoff bound (MCB), is examined and improved in this study. We …