Free-space satellite optical communication: adaptive information bandwidth to maintain constant bit error rate during periods of high satellite vibration amplitudes

1996 ◽  
Author(s):  
Arnon Shlomi ◽  
Norman S. Kopeika
Keyword(s):  
Optical Communication ◽  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Space Satellite

Improve the Bit Error Rate Performance of Free Space Optical Communication due to Atmospheric Turbulence Effect through the Robust Modulation

2014 ◽  
Vol 699 ◽  
pp. 942-947 ◽  
Author(s):  
A.K. Rahman ◽  
S.A. Aljunid ◽  
M.S. Anuar ◽  
H.A. Fadhil
Keyword(s):  
Atmospheric Turbulence ◽  
Optical Communication ◽  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Scintillation Index ◽  
Free Space Optical Communication ◽  
Free Space Optical ◽  
Space Optical Communication ◽  
Turbulence Effect

This paper focus on improvement bit error rate (BER) performance due to atmospheric turbulence effect in free space optical communication (FSOC) using new modulation technique that is dual diffuser modulation (DDM) technique. This technique uses two transmitter and differential mode detection at the receiver. The combination of dual diffuser with differential detection mode at receiver produce the superior modulation against the turbulence especially reducing the scintillation index, overcome the signal detection with fix zero threshold and improve the power received. These three element factors are important in order to improve the overall performance of free space optical system. The analysis result shows that under strong turbulence condition, the BER can improve 42 percent in term of FSO distance propagation.

scholarly journals Performance Analysis of Free Space Optical Communication System Under Rain Weather Conditions: A Case Study for Inland and Coastal Locations of India

2021 ◽  
Author(s):  
Harjeevan Singh ◽  
Nitin Mittal
Keyword(s):  
Attenuation Coefficient ◽  
Optical Communication ◽  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Weather Conditions ◽  
Coastal Areas ◽  
Free Space Optical Communication ◽  
Free Space Optical ◽  
Space Optical Communication

Abstract This work aims to investigate the performance of Free Space Optical Communication link under average and worst rain weather conditions of India. The meteorological data related to rainfall, from 2014 to 2017, was obtained from the Indian Meteorological Department for six different locations of India, representing the inland and coastal areas. The attenuation coefficient due to rain for all the locations has been calculated using mathematical models. The performance analysis of Wavelength Division Multiplexing based Free Space Optical Communication system has been analyzed, by incorporating the attenuation due to rain for all considered locations, in terms of received power, signal to noise ratio, bit error rate and eye diagrams. The inland location of Hyderabad has given the best results in terms of above mentioned parameters as it has recorded minimum average rainfall of 2.35 mm/hr with minimum attenuation coefficient of 1.91 dB/km and can support a link range of 5.43 km, corresponding to bit error rate of order of 10-9 under average rain weather conditions. On the other hand, the average rainfall is maximum for the coastal area of Mumbai with a value of 7.31 mm/hr, resulting in maximum attenuation coefficient of 4.08 dB/km and the maximum link range is limited to 3.48 km, corresponding to bit error rate of order of 10-9 under average conditions of rain weather. Similarly, the inland locations of India have delivered a better link performance as compared to coastal areas under worst rain weather conditions also. So it has been concluded that the coastal areas of India have shown major degradation in the performance of the FSOC link as compared to inland locations of the country.

Terrestrial Free Space Optic Propagation Analysis Considering Malaysia Weather Condition

2012 ◽  
Author(s):  
Wan Rizal Hazman Wan Ruslan ◽  
Sevia Mahdaliza Idrus ◽  
Arnidza Ramli ◽  
Norhafizah Ramli ◽  
Abu Sahmah Mohd Supa’at ◽  
...  
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Weather Condition ◽  
Q Factor ◽  
Performance Characterization ◽  
Space Optics ◽  
Terrestrial System ◽  
Data Rates ◽  
Free Space Optic

Pemantulan cahaya matahari oleh cermin atau dikenali sebagai heliograf adalah kaedah awal komunikasi optik wayarles (OWC). Sewajarnya, sistem komunikasi moden mendedahkan kadar data yang tinggi di samping kualiti perkhidmatan yang lebih baik berbanding kaedah terdahulu. Sistem komunikasi optic wayarles mempunyai banyak kebaikan dimana ia adalah penting untuk sistem daratan, sebagai contoh penggunaan Optik Ruang Bebas (FSO) di kawasan luar. Di dalam kertas kerja ini, gambaran dan pencirian prestasi sistem Optik Ruang Bebas seperti pelemahan, kadar bit kesalahan (BER), faktor Q dan jenis pengesan yang berguna untuk pengesanan dalam sistem FSO dibentangkan. Sistem telah direkabentuk dan disimulasi untuk perincian prestasi dengan mengambil kira kawasan Subang. Kata kunci: Pelemahan; kadar bit kesalahan; pengesan foto; faktor Q; sistem daratan The reflection of sunlight by mirrors or known as the heliograph is an early method of optical wireless communication (OWC). Naturally, modern communication system reveals much higher data rates with better quality of service (QoS) compared to those ancient methods. There are many advantages of OWC which are important for a terrestrial system for example the usage of an outdoor free space optics (FSO) system. In this paper, a description and system performance characterization of the FSO such as attenuation, bit error rate (BER), Q factor and the type of detectors that are highly useful for detection in FSO systems are presented. The system are designed and simulated for performance characterization considering Subang terrestrial. Key words: bit error rate; photodetector; Q factor; terrestrial system

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