Abstract
We propose a multicast scheme for multibeam satellite systems exploiting both the multiuser and spatial diversity inherent in this type of systems while taking into account realistic physical distributions of User Terminals (UTs) over the coverage. Our proposed scheme makes use of the well-known Adaptive Coding and Modulation (ACM) feature in Digital Video Broadcasting over Satellite, 2nd Generation (DVB-S2) and Extension (DVB-S2X) standards but also incorporates a set of innovative features. First, multilink reception, that is, receivers that can syntonize different frequencies and/or polarizations, together with Network Coding (NC) is used to enable decoding of signals from adjacent beams (spatial diversity). Second, efficient and fair allocation of resources is achieved through Proportionally Fair Multicast (PFM) scheduling. Our results, obtained over realistic nonuniform UTs distributions, show average system multicast throughput gains up to 88% with regard to state-of-the-art multicast schemes. Furthermore, a complete cross-layer architecture is proposed, fully compliant with the standard providing Quality of Service (QoS) guarantees.
Highlights
Recent studies are showing an increasing demand for the efficient distribution of personalized contents in Internet based networks [1]
In order to show results for the proposed scheme, we focus on clusters of 6/7 beams under the control of a single GW within a system of the characteristics of Table 1
Note that this is a feasible approach since HTS systems require several GW feeder links in order to provide User Terminals (UTs) with the required throughputs for broadband and multimedia applications [33, 34]
Summary
Recent studies are showing an increasing demand for the efficient distribution of personalized contents in Internet based networks [1]. This has led to the deployment of satellite platforms delivering high throughputs (HTS systems) such as Ka-SAT [2] or constellations of communication satellites such as the O3b system [3]. Multicasting is one of the cornerstones for the effective dissemination and distribution of personalized multimedia contents in broadband networks and the focus of this paper Applications such as audio/video streaming, online gaming, file distribution, and file downloading are based on multicast-like transmissions
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