专利名称：Two-system protocol conversion transceiver
repeater
发明人：Wiedeman, Robert A.申请号：EP96302353.6申请日：19960403公开号：EP0748064A3公开日：19980107
专利附图：
摘要：A system and method are disclosed for bidirectionally coupling a first satellitecommunication system to a second satellite communication system, wherein the first andsecond systems operate with different protocols. In a presently preferred embodiment
of this invention the first system uses a spread spectrum (SS), code division multipleaccess (CDMA) technique wherein the satellites serve as simple 'bent pipe' repeaters forrelaying communications between a user and a gateway. The second satellite
communication system may be any other type of system having at least one characteristicthat precludes direct communication between the first and the second systems. In anexemplary embodiment the second system uses a time division multiple access (TDMA)technique, and furthermore enables direct satellite-to-satellite communication links. Aground-based protocol conversion unit (70) is positioned for receiving a communicationfrom a satellite of either the first or the second system, and includes circuitry forconverting the transmission into a transmission that is suitable for transmission into theother system. For example, a SS-CDMA transmission is received from the first system, istranslated into a TDMA format, and is transmitted into the second system. Thecommunication may then be relayed between at least two satellites of the secondsystem before being transmitted to a ground station of the second system forconnection to the local public switched telephone network (PSTN). A hybrid
communication system in accordance with this invention is formed by placing the protocolconverter between two dissimilar satellite-based communication systems, thereby linkingthe two dissimilar systems for bidirectional voice and/or data communications.
申请人：Globalstar L.P.
地址：3200 Zanker Road San Jose, California 95134 US
国籍：US
代理机构：Vaufrouard, John Charles
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