Link Analysis of Commercial and Wideband Gapfiller Satellite (WGS) Satellites Using DVB-S2 with Variable Coding and Modulation (VCM)

摘要

A link analysis was performed of the Digital Video Broadcast-Satellite (DVB-S) second generation waveform (DVB-S2) using a commercial (Ku band) and the Wideband Gapfiller Satellite (WGS) satellite at X-band and Ka-band. The analysis is for the CENTCOM VSAT network (also known as the Global War On Terrorism [GWOT] network) that uses the EUTELSAT W6 satellite (2□5° east) and supports both forward (DVB-S) and return traffic [DVB-Return Channel by Satellite (RCS)] traffic in the same 72 MHz transponder. The forward traffic consists of nominal DVB-S broadcasts to receive-only terminals (□m) as well as duplex □8m and 2.4m terminals. The return traffic consists of constant-rate, tactical, video feeds (from the 2.4m terminals) along with SIPRNET Internet Protocol (IP) interactive traffic (from the □8m terminals). The hub is located at Landstuhl, Germany. The paper considers 3 cases. First, the capacity of the Eutelsat W6 transponder is computed for the forward and return traffic sharing the same transponder. Next, the capacity is computed for DVB-S2 using Constant Coding and Modulation (CCM) and Variable Coding and Modulation (VCM) over the baseline GWOT network. Finally, the system capacity is computed using WGS (at 60° east) again using DVB-S2 with CCM and VCM and DVB-RCS.