Advances in Networks 2020; 8(1): 1-8 http://www.sciencepublishinggroup.com/j/net doi: 10.11648/j.net.20200801.11 ISSN: 2326-9766 (Print); ISSN: 2326-9782 (Online) Rain Fade Mitigation Technique Using Residue Number System Architecture on KU Band Satellite Communication Link Stephen Akobre 1, * , Mohammed Ibrahim Daabo 2 , Abdul-Mumin Salifu 3 Faculty of Computing and Information Sciences, C. K. Tedam University of Technology and Applied Sciences, Navrongo, Ghana Email address: * Corresponding author To cite this article: Stephen Akobre, Mohammed Ibrahim Daabo, Abdul-Mumin Salifu. Rain Fade Mitigation Technique Using Residue Number System Architecture on KU Band Satellite Communication Link. Advances in Networks. Vol. 8, No. 1, 2020, pp. 1-8. doi: 10.11648/j.net.20200801.11 Received: August 26, 2020; Accepted: October 13, 2020; Published: October 20, 2020 Abstract: Rain fade is the loss of signal power at the receiver of a telecommunication system mainly due to absorption and scattering caused by rain in the transmission medium, especially at frequencies above 10 GHz. In order to combat the loss of the signal power at the receiver, there is the need to employ rain fade mitigation techniques. Consequently, researchers have been studying how rain affects the signal in different geographical locations as well as proposing some mitigation techniques. Power control is one of the mitigation techniques that have been proposed. But this technique has some associated challenges. Increasing the power will lead to an increase in cost of transmission which will eventually be passed on to the consumer thereby making satellite services expensive. It introduces a delay in compensation due to link estimation and coordination. Also, because of health concerns there is a limit to the amount of power that can be radiated to the ground and this is governed by international agreements. Another power management drawback in using this technique is that, it is essential to track the power continuously to ensure that the power values are not set too high, which can lead to the front end of the receiver being overdriven and eventually leading to a shutdown or physical damage. In this paper, we address the power control challenges, by leveraging on the inherent properties of Residue Number System (RNS) to propose an RNS architecture using the moduli set {2 2n+1 -1, 2 2n -1, 2 2n } that can mitigate rain fade in the satellite link. In digital communication systems, the bit energy, e b , is the most important parameter in determining the communications link performance. Numerical analysis shows that the proposed scheme performs better than the traditional method as indicated in the high energy per bit value obtained in the proposed system in comparison with the traditional method. Keywords: Rain Fade Mitigation, Power Control, Residue Number System 1. Introduction The immense strength of satellite broadcasting lies in its ability to access a limitless number of sites without the need for any physical links irrespective of their location. A satellite receives the up-linked signal, lowers its frequency and rebroadcasts it to any geographical area desired. Ku band satellites are designed for spot beams, operating in the higher range of 12 GHz and allow smaller antennas to capture their signals [1]. The satellite signal transmission process is shown in Figure 1. Rainfall is known to be the major cause of signal impairment in Ku band. In view of this, researchers have been developing rain rate and rain attenuation models to characterise and predict the effects of rain and propose mitigation techniques. However, very little has been done with regards to rain attenuation mitigation. A research was conducted on mitigation technique for rain fade using frequency diversity method by [2] in Malaysia. The frequency diversity method was used; however, this technique is not suitable because ground stations and satellites using this technique must be equipped to operate in dual frequency mode. The method is also complex because the receiver will have to pick up all the different signals. Power control is one of the mitigation techniques that have been