Multibeam, digitally modulated, time division, switched satellit

Details Multibeam, digitally modulated, time division, switched satellit Multibeam, digitally modulated, time division, switched satellit

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.

REFERENCES:
patent: 3406401 (1958-10-01), Tillotson
patent: 3530252 (1970-09-01), Puente
patent: 3711855 (1973-01-01), Schmidt et al.
patent: 3818453 (1974-06-01), Schmidt et al.
patent: 3835253 (1974-09-01), Bond
patent: 3839599 (1974-10-01), Pitroda
patent: 3842350 (1974-10-01), Gross
patent: 3858007 (1974-12-01), Ganssmantel
patent: 3928804 (1975-12-01), Schmidt et al.
patent: 3942115 (1976-03-01), Wolejsza, Jr.
patent: 3958083 (1976-05-01), Hara et al.

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