Abstract
Millimeter-wave will be the strong contender for the terrestrial link using for 5G networks. So it is imperative to examine these frequency bands to ensure the uninterrupted services when 5G network is connected in tropical regions. A critical challenge of link-budgeting in mm-wave 5G networks is the precise estimation of rain attenuation for short-path links. The difficulties are further intensified in the tropical areas where the rainfall rate is very high. Different models are proposed to predict rain attenuation, however recent measurements show huge discrepancies with predictions for shorter links at mm-wave. The path reduction factor is the main parameter in the prediction model for predicting total attenuation from specific rain attenuation. This study investigates four path reduction factor models for the prediction of rain attenuation. A comparison was made between these models based on rain attenuation data measured at 26 GHz at 300 m and 1.3 km links in Malaysia. All models are found to predict rain attenuation at a 1.3 km link with minimum errors, while tremendous discrepancies are observed for 300 m link. Hence it is highly recommended to further investigate the reduction factor model for shorter links less than 1 km
Highlights
The Worldwide continuous demand for data on wireless communication systems having user ubiquitous access requires a high-speed data rate and a large bandwidth to fulfill the requirement uninterruptedly. 5th generation (5G) millimeter-wave communication system is coming forth technology which will provide efficient mmWave spectrum utilization to provide high-speed data rates and large bandwidth
Attenuation caused by the rain of an mm-wave link faces a tremendous challenge to signal accessibility for 5G networks operating in tropical regions
The path reduction factor is the main parameter in the prediction model for predicting total attenuation from specific rain attenuation
Summary
The Worldwide continuous demand for data on wireless communication systems having user ubiquitous access requires a high-speed data rate and a large bandwidth to fulfill the requirement uninterruptedly. 5th generation (5G) millimeter-wave (mm-Wave) communication system is coming forth technology which will provide efficient mmWave spectrum utilization to provide high-speed data rates and large bandwidth. Most of the measurements for the mm-wave terrestrial link are concentrated on effective path length and considered path reduction factors (less than 1) as the main part of the rain fade estimation These prediction models are used as a way of ‘averaging out’ the spatial inhomogeneity of rainfall rate that is uniformly distributed along the propagation path of 1 km and named as specific attenuation in dB/km. ITU recommended applying this model around the world, by giving measured rainfall rate data at the regionally or by applying the ITU recommended map It is applicable for estimation of rain attenuation at any frequency somewhere in the range of 1 and 100 GHz with a limited distance till 60 km. The regression coefficients of (13) were obtained by multiple nonlinear regressions, using the currently measured data in the ITU-R databanks
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