In this paper, we want to present a simulation platform for multimedia broadcast over DVB-SH. The platform has been designed and implemented within the context of the ESA study on "Scalable Video Coding Applications and Technologies for mobile satellite based hybrid networks". Its main features are realistic modeling of the multimedia encoding/decoding procedures done at the broadcasting headend and the mobile terminals, a detailed simulation of the DVB-SH link layer, and a representative emulation of the DVB-SH physical layer. With the help of this platform, important use cases for future DVB-SH systems, such as support of heterogeneous devices, graceful degradation of application quality across the coverage area, efficient statistical multiplexing of different services, etc. can be investigated in a straightforward and conclusive manner.
In this paper, we evaluate a multilevel coding (MLC) scheme with multistage decoding (MSD) designed for satellite broadcasting communications. The impact of three different satellite system impairments on the decoding performance is analyzed. First, the influence of errors introduced by the channel estimation is discussed, assuming a typical data-aided (DA) channel estimator with different pilot lengths. Second, the impact of the residual phase noise present after the phase recovery is investigated using a model based on a normal distribution. Finally, the degradation introduced by the non-linearities of the satellite power amplifiers is also analyzed. The impact of these effects is investigated via the mutual information. Besides, bit error rate (BER) simulations are performed for each impairment effect. The considered MLC scheme is compared to a classical bit-interleaved coded modulation (BICM) scheme, showing that the MLC scheme provides different grades of robustness for each level.
Modelling of the slow fading effects is essential for systems with long interleaving or targeting high quality-of-service (QoS). Time series are an efficient method to model the slow fading effects and allow using sequence derived from field experiments for the system evaluation. The paper gives an overview to the method and describes setups simplifying the work for typical problem areas
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