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Evaluation of Atmospheric Detrimental Effects on Free Space Optical Communication System for Delhi Weather
摘要： Free Space Optical (FSO) communication systems are gaining popularity due to its tremendous speed, advanced capacity, cost effectiveness, secure and easy to deploy wireless networks. This technology has proven an effective choice for last mile applications and hard to reach areas where deployment of optical fibre links is not feasible. But FSO link is highly weather dependent and as signal passes through the atmospheric channel, the main impairments are the atmospheric turbulence, which induce fading and deteriorate the system performance. Delhi has a great potential for FSO communication because of its clear skies. Since there is no analysis for weather condition found in Delhi, this work provides analysis of typical Delhi weather condition ranging from heavy to light rain, fog and clear sky. The performance of FSO link is analysed in terms of attenuation and link length margin under different weather condition. The results are concluded to identify which atmospheric condition influences more on FSO link performance.
关键词： rain attenuation,atmospheric attenuation,free space optical communication,absorption,scattering,visibility,rainfall rate,Delhi weather condition,fog attenuation,link margin
更新于2025-09-23 15:19:57
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Reliability of Disdrometer-derived W-Band Attenuation Predictions
摘要： applications W-band frequencies are used for radar observations of clouds. In a undergo underneath potential significant attenuation. Also in satellite telecommunications the use of W-band frequencies is planned, to transfer the ever increasing amount of data. Rain attenuation is one of the most significant atmospheric effects influencing propagation, and precise knowledge is important for system design. signals the Often the specific rain attenuation is given as a function of rain rate, but at higher frequencies, such as W-band, the sensitivity to the shape of the drop size distribution (DSD) increases. Incorporating DSD measurements in the prediction process is recommended. In this study the reliability of the on DSD attenuation measurements is confirmed through comparison with radiometric attenuation data, acquired from an Atmospheric Propagation and Profiling System (ATPROP). 90 GHz, 2D-Video-Disdrometer predictions (2DVD), based of at a
关键词： W-band frequencies,electromagentic wave propagation,specific rain attenuation
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Statistics of Rain Attenuation in Prague, Empirical Data and Numerical Predictions
摘要： Attenuation of electromagnetic waves in microwave bands is determined experimentally via measurement of received signal variations on terrestrial radio links operating in three frequency bands around 58, 94 and 122 GHz. The measured time series of attenuation are processed to obtain long-term cumulative distributions of attenuation due to hydrometeors. The obtained empirical distributions are compared with the ones predicted using the model of the Recommendation ITU-R P.530. For a given time percentages, the predicted attenuation levels exceeded are apparently lower than the levels of empirical distributions. A power-law relationship between attenuation and rain intensity is obtained by a least square approximation of measured simultaneous rain intensity and rain attenuation. The results are discussed and compared with the numerical predictions.
关键词： electromagnetic wave propagation,atmospheric hydrometeors,rain attenuation
更新于2025-09-04 15:30:14