| A link analysis was performed of the Digital Video Broadcast-Satellite (DVB-S) second generation waveform (DVB-S2) using a commercial (Ku band) and a Wideband Gapfiller Satellite (WGS) satellite. The analysis is motivated by the CENTCOM VSAT network (aka the GWoT network) that uses the EUTELSAT W6 satellite (21.5 degrees 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 (1m) as well as duplex 1.8m and 2.4m terminals. The return traffic consists of constant-rate, tactical, video feeds (from the 2.4m terminals) along with SIPRNET IP interactive traffic (from the 1.8m terminals). The hub is located at Landstuhl, Germany. First, the capacity of the W6 transponder is computed for the forward and return traffic sharing the same transponder. Next, the increased capacity will be computed due to an upgrade to DVB-S2 with VCM (at the hub Modem in Landstuhl and the VSAT terminal integrated receiver and decoders in SWA) over the baseline GWoT network. Finally, the system capacity is computed using WGS (at 60 degrees east) again using DVB-S2 with VCM and DVB-RCS. |