ATM cell/IP packet transmission characteristics evaluation in multimedia interactive satellite communication system

Asymmetric bidirectional satellite communication systems (multimedia satellite communication systems) with the capability of economical and high-speed multimedia access using terrestrial stations in the uplink and satellite circuits in the downlinks are proposed and an experimental prototype is fabricated. In this system, ATM cell/IP packets are transmitted in the satellite circuits and performance is evaluated in terms of the error characteristics of the ATM layer/IP layer, which play an important role in system design. In this respect, a simple error model is used to represent the satellite circuit part of the multimedia communication system and the actually measured results and their corresponding evaluation are also presented. By determination of proper parameters and their values, good agreement is seen between the calculated results based on the presented model and the measured ones. At a cell loss rate of 10(-7), the required E-b/N-0 of the system is about 4.7 dB. Further, the system margin is shown to be about 7 dB in achieving such EbN0 ratios, which indicates that the system possesses sufficient realization capability. (C) 2001 Scripta Technica.