DVB-S2 ACM: Capacity Assessment and Key System Issues
Point-to-point multi-beam satellite systems based on the DVB-S standard are currently designed for link closure in the worst-case prop- agation and location conditions. The DVB-S standard, conceived for broadcasting applica- tions, considers a fixed coding rate and modula- tion format that are selected according to the assumed coverage and availability requirements. This approach implies the occurrence of high margins in the majority of the cases, when inter- ference and propagation conditions allow for higher signal-to-noise-plus-interference ratio. The adaptive coding and modulation (ACM) introduction in the new DVB-S2 standard for the interactive service profile opens up a number of appealing opportunities for the design and development of satellite broadband networks. In this article we show how the ACM introduction in the satellite downlink enables greatly enhanced system performance but also has a profound impact on the way the system and some of the key system components are designed.