Patent
1976-10-15
1978-08-08
Safourek, Benedict V.
179 15BS, H04B 720
Patent
active
041059735
ABSTRACT:
The present invention relates to a multibeam, digitally modulated, time division switched communication system especially for use with a satellite repeater wherein separate up-link and down-link signals are transmitted between each of a plurality of ground station areas and the repeater using space diversity techniques. The frequency band of each up-link signal is split to include at least two frequency multiplexed channels, each channel being separated at the repeater and independently switched at baseband frequencies through a repeater switching network comprising at least two matrix switches for retransmission on the appropriate down-link signal. Synchronizing and clock recovery procedures are used to enable both the clock at each ground terminal station within each ground station area to be synchronized with a master clock at the repeater, and the corresponding bits and subframes within an information frame to arrive in synchronism at the repeater to permit simultaneous switching of all up-link channels through the repeater switching network. The repeater switching network is controlled from the ground terminal stations by control signals included in each up-link subframe, the control signals determining for its associated down-link channel which synchronized up-link channel from another ground station area is to be connected to the associated down-link channel.
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Arnold Hamilton W.
Tillotson LeRoy C.
Young, Jr. James A.
Bell Telephone Laboratories Incorporated
Pfeifle Erwin W.
Safourek Benedict V.
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