A TDMA satellite communication system for ISDN services-offset QPSKburst modem coupled with high coding gain FEC

摘要

The authors propose a time-division multiple-access (TDMA)satellite communication system suitable for integrated services digitalnetwork (ISDN) services for both basic interface services and primaryinterface services. The proposed system offers B-channel transmissionlines among telephone offices and subscriber lines for basic and primaryinterface services. To provide these service economically andefficiently, the proposed system uses an offset QPSK burst modem coupledwith high-coding gain forward-error correction in addition to demandassignment technology for each data burst and a transmitting andreceiving transponder hopping TDMA scheme. Major functions of TDMAterminals have been implemented in LSICs, monolithic ICs, and hybridICs. The experimental results show little P_edegradation for the offset QPSK burst modem and perfect operation of thedemand assignment and carrier hopping capability of the developed system