Quality of Service of VoIP over DVB-RCS multimedia satellite withon board processing
In this work we investigate the use of the DVB-RCS return channel to provide two-way VoIP transmissions over regenerative GEO satellites. Transmission impairments result from congestion and jitter like in terrestrial network but the paramount impairment in a GEO satellite scenario is the large propagation delay. So therefore, we develop a model for the DVB-RCS transmission delays by assuming a MFTDMA superframe pattern. We also develop a model for the switching matrix on-board that can serve a variable number of users depending on the speech coders under consideration. We finally obtain objective parameters of the quality of voice for different speech coders G.711, G.723 and G.729 and results have shown that some codecs do not achieve sufficient performance in a DVB-RCS scenario.