CDMA system architecture for satcom terminals

Details CDMA system architecture for satcom terminals CDMA system architecture for satcom terminals

1997-06-13

2000-04-18

Kizou, Hassan

Multiplex communications

Communication over free space

Message addressed to multiple destinations

370314, 370316, 370320, 370325, H04B 7212

Patent

active

060523646

ABSTRACT:
A satellite communication system including a portable satellite terminal is provided which utilizes C/K.sub.u -band and spread spectrum technology to drastically reduce the antenna and terminal sizes. Both CDMA and time division multiplexing (TDM) are used to permit efficient all-digital voice, facsimile and data operations in either full mesh or star modes. A single Network Controller can handle both Star and Mesh mode traffic on the same or several transponders. Narrowband CDMA/frequency division multiple access is used for inbound transmission from the terminal while outbound transmissions from the hub utilize TDM/FDMA. Furthermore, the system is scalable in fixed bandwidth increments to support network size evolution. All signalling for call setup and takedown is done in-band on the same carrier that is used for the traffic, thereby eliminating the need for a separate signalling channel and frequency retuning. Only a small set of distinct PN code sequences, independent of the actual number of user terminals in the network, are required for the entire network.

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