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Rain fade dynamic characteristics for ku-band satellite communication systems in Malaysia

Jong, Siat Ling (2015) Rain fade dynamic characteristics for ku-band satellite communication systems in Malaysia. PhD thesis, Universiti Teknologi Malaysia.

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Abstract

Satellite communication systems operating at frequencies above 10GHz are always subjected to signal fade occurrences due to heavy precipitation, particularly in equatorial regions. In order to reduce the impact of these fades, there are several Propagation Impairment Mitigation Techniques (PIMTs) exist to cope with deep fades, such as implementation of power control, link diversity and adaptive modulation schemes. However, the proper design and implementation of PIMTs require knowledge of the first time- and second-order statistics of rain attenuation. Hence, this work concentrates on those aspects in equatorial Johor Bahru, Malaysia based on a one year Ku-band propagation measurement campaign that includes the equipment of Direct Broadcast Receiver (DBR) and Automatic Weather Station (AWS). The investigation of precipitation characteristics begins by processing the rain tip data collected from AWS. A new processing method is proposed to improve the estimation of precipitation statistics specifically for lower rain rates than 12 mm/h. Then,rain fade behaviour such as rain attenuation, fade duration and fade slope as well as seasonal and diurnal variations of rain attenuation are also investigated. It was found that convective rain are likely to occur during the afternoon hour from 3 to 5 pm with high intensity, shorter duration and relatively high rate of change of attenuation during the inter-monsoon season. Besides, the Synthetic Storm Technique (SST) and Stratiform Convective-Synthetic Storm Technique (SC-SST) are proposed to estimate the dynamic characteristics of rain attenuation directly from rain rate time series, especially in the absence of measured attenuation data. The SC-SST was found 10% better than the SST and 57% better than ITU-R models in predicting fade duration, while SST was comparable with ITU-R P 1623-1 model in estimating fade slope statistics. Finally, by taking advantage of local rain attenuation characteristics a time diversity technique is recommended to compensate for deep fades, particularly in heavy rain regions.

Item Type: Thesis (PhD)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-5865 Telecommunication. Telegraph.
Depositing User: En. Sharul Ahmad
Date Deposited: 17 May 2016 07:32
Last Modified: 17 May 2016 07:32
URI: http://eprints.uthm.edu.my/id/eprint/7756
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