H - Electricity – 04 – B
Patent
H - Electricity
04
B
363/11
H04B 7/185 (2006.01) H04B 7/212 (2006.01)
Patent
CA 1262382
Abstract of the Disclosure: In a TDMA satellite communication network compris- ing a plurality of earth stations, a predetermined one of the stations is operable as a primary reference station for producing a first and a second reference burst to define a multiframe and a frame in an up-link signal, respectively. A synchronization burst is placed at every multiframe by each station with reference to the first and the second reference bursts detected from a down-link signal. A subsidiary reference station is selected from the remaining station to produce a specific one (SY2) of the synchronization bursts and a subsidiary reference burst (SR1) which is placed at the same time instant as the first and the second reference bursts. When the first and the second reference bursts disappear from the down-link signal, each station keeps synchronization with reference to the specific synchroniza- tion burst. Thereafter, synchronization is kept in each station with reference to the subsidiary reference station. The subsidiary reference burst may be produced in place of and simultaneously with the first and the second reference bursts when a single carrier frequency and a plurality of carrier frequencies are used in the network, respectively. Use of the plurality of carrier frequencies requires partial modification of hopping operation. The partial modification is possible by selectively producing a modification hopping code represent- ative of modification of the hopping operation.
481124
Corporation Nec
Smart & Biggar
LandOfFree
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