GBS over WGS Using DVB-S and DVB-S2 (#1546)

This paper determines the link performance of Global Broadcast Service (GBS) when it is transitioned to Wideband Global SATCOM (WGS) satellites. Current and future (smaller) GBS terminals as well as current Digital Video Broadcast-Satellite (DVB-S) and future (DVB-S2) Modems are considered. DVB-S2 provides a large increase in capability in terms of modulations and forward error correcting coding rates. In addition, DVB-S2 allows for different modulations and coding to different terminals using variable coding and modulation (different streams are coded with different, fixed parameters within the DVB-S2 physical layer frame). Further DVB-S2 allows adaptive coding and modulation whereby each frame is coded with its own set of parameters (which are dynamically modified according to reception conditions). The WGS performance will be based on a System Utilization Plan (SUP) including a frequency plan and beam configuration applied to the first WGS satellite placed in orbit at 175E. The WGS SUP includes a case where two uplink carriers in a single WGS 125 MHz channel are fanned-out to two Ka-band downlink beams where the downlink carriers share the same channel. Cases where the single GBS downlink carrier shares the 125 MHz channel with non-GBS traffic are also considered. A Theater Injection Point (TIP) uplink into a narrow beam with the downlink in a wide bean is also defined. Several propagation margins are considered to allow results to be applied to different receive terminal locations.