A Study on the Effect of Improving Data Rates by Adaptive Coding and Modulation for High Throughput Satellite in Time-Varying Communication Environments

Abstract

We studied the effect of using Adaptive Coding and Modulation (ACM) on the data rate of a system that communicates between a high throughput satellite in geostationary orbit and the ground. We assumed two cases: OFDMA (Orthogonal Frequency Division Multiple Access) communication system and the environment under the resource control for frequency bandwidth and transmission power between beams. Rain attenuation was calculated from AMeDAS rainfall data to show the effect of ACM on actual rainfall changes. The modulation scheme and coding rate used those of DVB-S2 and DVB-S2X. The proposed method determines the allocation ratio of communication resources (transmission power and bandwidth) using the user's traffic demand information acquired from another channel and shows the effect of this method on the data rate when combined with ACM by comparing it with the case where communication resources are equally allocated to users.