A Comparative Analysis of Different Modulation Techniques Based on Subcarrier Intensity Modulation in Free Space Optics Using Log-Normal Turbulence Model

2016 ◽  
Author(s):  
Rajat Kumar Giri ◽  
Bijayananda Patnaik
Keyword(s):  
Comparative Analysis ◽  
Turbulence Model ◽  
Free Space ◽  
Intensity Modulation ◽  
Free Space Optics ◽  
Space Optics ◽  
Modulation Techniques ◽  
Log Normal

scholarly journals A Review On FSO By Using Different Modulation Techniques

2018 ◽  
Vol 7 (3.8) ◽  
pp. 136
Author(s):  
Rajan Miglani ◽  
Sachal Charak ◽  
Sandeep Kumar Arora ◽  
Mahedi Masud
Keyword(s):  
Free Space ◽  
Atmospheric Condition ◽  
Free Space Optics ◽  
Space Optics ◽  
Rf Communication ◽  
Modulation Techniques ◽  
Efficient Communication ◽  
Atmospheric Channel ◽  
Better Than

Now a days as we are seeing that the free space optics is one of the emerging technology used for the replacement of the radio frequency wireless communication, due to their advantages over it like cost, speed, bandwidth, minimum error as well as efficient communication. The quality of services provided by the FSO is far better than the RF communication network. The free space optics is unlicensed band which make it less costly than the licensed band technology. As the atmospheric channel is used for transmission the effects of atmospheric condition effects the communication. In this paper we try to discuss all the modulation schemes which help to improve the performances of the optic system. 

scholarly journals Performance Evaluation of Log-normal And Negative Exponential Channel Modeling Using Various Modulation Techniques in OFDM-FSO Communication

2005 ◽  
Vol 4 (2) ◽  
pp. 639-647
Author(s):  
Nitin Shankar Singh ◽  
Gurpartap Singh
Keyword(s):  
Phase Shift ◽  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Free Space Optics ◽  
Phase Shift Keying ◽  
Space Optics ◽  
Modulation Techniques ◽  
Shift Keying ◽  
Negative Exponential

Free Space Optics (FSO) is one of the emerging technology which is thoroughly being popular and is basically using optical signals for the communication. The paper evaluates the bit error rate performance of the Free space Optics (FSO) system. To design a high performance communication link for the atmospheric FSO channel, it is of great importance to characterize the channel with proper model. The performance of the highly efficient, high data rate system is limited by the certain constraints like scintillation effects and atmospheric turbulence. The FSO communication system using Orthogonal Frequency Division Multiplexing (OFDM) technique which is known for its increased robustness against frequency selective fading, narrow-band interference and high channel efficiency. The performance of the modulation techniques- Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK) and 8-PSK are studied in the Lognormal and Negative Exponential channel. The obtained results are the comparative study of Bit Error Rate (BER) vs. Signal to Noise Ratio (SNR), which is quite useful for analyse the system performance with different channel models for various modulation techniques.

scholarly journals Modulation Techniques of Free Space Optics using Various Link Ranges

2019 ◽  
Vol 9 (2) ◽  
pp. 2952-2955
Keyword(s):  
Free Space ◽  
Free Space Optics ◽  
Free Space Optical ◽  
Optical Links ◽  
Space Optics ◽  
Data Rates ◽  
Modulation Techniques ◽  
Efficient Communication ◽  
Link Budget ◽  
Attenuation Values

Free space optics is the present trend, which enables the communication to achieve the expected data rates for the increasing user demands. The utility of FSO in free space medium enables higher data rates than the conventional microwave links for efficient communication. Several researchers have performed the analysis of free space optics by use of different modulation techniques and optimization of the link budget in free space optical links. In this work, CW laser transmitting source ranging to 10dB of output level, link ranges of 500, 1000 and 1500 mts with attenuation values of 0.2, 0.7 and 0.9 dB/Km respectively are considered. The analysis of free space optics is carried out by using various modulation techniques such as ASK, PSK, FSK, MZ, EA, Dual Drive MZ and it is observed that Dual Drive MZ modulation performs well when compared with the other modulation techniques.

Analysis of Free Space Optics Link Performance Considering the Effect of Different Weather Conditions and Modulation Formats for Terrestrial Communication

2020 ◽  
Vol 41 (4) ◽  
pp. 463-468 ◽  
Author(s):  
Sanmukh Kaur ◽  
Amayika Kakati
Keyword(s):  
Free Space ◽  
Weather Conditions ◽  
Index Of Refraction ◽  
Free Space Optics ◽  
Modulation Formats ◽  
Space Optics ◽  
Link Performance ◽  
Dense Fog ◽  
Log Normal ◽  
Research Analysis

AbstractFree space optics (FSO) links provide an effectual and efficient way of transmission of data throughout free channels due to its higher bandwidth and inbuilt capability of security. In this research analysis, the FSO link is evaluated on the basis of Q value for different modulation formats and weather conditions. Gamma–Gamma and log-normal scintillation models have been analyzed for different index of refraction in terms of Q factor versus a range of a proposed FSO link. Attenuation increases during the occurrence of different fog conditions, and there might be complete link failure in the case of dense fog and for some of the cloud conditions.

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