6 research outputs found
Relative positioning of the Satellite Digital Multimedia Broadcast (S-DMB) amongst candidate mobile broadcast solutions
No full textIntegrating Satellite Digital Radio Broadcasting (S-DB), Terrestrial Cellular Technology and EGNOS Satellite Navigation
No full textHybrid satellite and terrestrial infrastructure for mobile broadcast services delivery: An outlook to the ‘Unlimited Mobile TV’ system performance
No full textOrganic thionitroso compounds
No full textA series of novel N-substituted phthalimide-2-sulplienamides was prepared. The N-aryl analogues were shown to be efficient precursors to thionitrosoarenes. Extension of the methodology to heteroaroraatic and acyl derivatives was unsuccessful, with the exception of 3-thionitroso- pyridine, the first known thionitrosoheteroarene. Thionitrosoarenes are shown to be versatile dienophiles and enophiles. Reactions with various substituted dienes proceeded with high stereoselectivity and some regioselectivity to afford 3,6-dihydro- 1,2-thiazines. Cycloadditions of thionitrosoarenes generated independently from imidosulphurous chloride precursors showed similar selectivities. The mechanism of cycloaddition is discussed in the light of molecular orbital calculations
Evaluation of cross-layer reliability mechanisms for satellite digital multimedia broadcast
No full textThis paper presents a study of some reliability mechanisms which may be put at work in the context of Satellite Digital Multimedia Broadcasting (SDMB) to mobile devices such as handheld phones. These mechanisms include error correcting codes, interleaving at the physical layer, erasure codes at
intermediate layers and error concealment on the video decoder. The evaluation is made on a realistic satellite channel and takes into account practical constraints such as the maximum zapping time and the user mobility at several speeds. The evaluation is done by simulating different scenarii with complete protocol stacks. The simulations indicate that, under the assumptions taken here, the scenario using highly compressed video protected by erasure codes at intermediate layers seems to be the best solution
on this kind of channel
