Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1986-11-07
1989-03-07
Buczinski, Stephen C.
Pulse or digital communications
Spread spectrum
Direct sequence
370101, 370103, 375108, 375109, 375118, 375120, H04L 700, H04J 306
Patent
active
048113654
ABSTRACT:
An improvement to a communications system such as a satellite communications system, or the like, wherein a plurality of nodes transmit over a common path on a time sharing basis via a central hub. The method and apparatus permits closer spacing of the communications from the nodes on the path and eliminates wasted delay time. The method comprises designating one of the nodes as the reference node and the remaining nodes as slave nodes. A transmission sequence is begun by having the reference node transmit a repeating, pre-established, pseudo-random, digital sequence at a pre-established bit rate. The reference node continues its sequence, but then omits a portion between the start and end of the sequence. A slave node wishing to join the transmission sequence begins the same repeating, pre-established, pseudo-random, digital sequence at approximately the same pre-established bit rate and then starts transmitting an approximation of the portion of the sequence being omitted by the reference node. By adjusting the bit rate, phasing, framing and sequence portion of the transmission from the slave node until the portion being transmitted thereby exactly matches the portion being omitted by the reference node, the reference node and slave node are placed in precise synchronization. The slave node then informs the reference node that it is in synchronization and ready to begin normal message transmission. Normal message transmission is then begun by the reference and slave nodes. Since the slave nodes are in precise synchronization with the reference node and the length of each node's transmission is exact and pre-established, each node can precisely calculate the time at which to begin its transmission without need for delay between transmissions or the danger of overlap.
REFERENCES:
patent: 3350644 (1967-10-01), McNair
patent: 3566268 (1971-02-01), Webb
patent: 3969582 (1976-07-01), van Duuren et al.
patent: 4471481 (1984-09-01), Shaw et al.
patent: 4651330 (1987-03-01), Ballance
Buczinski Stephen C.
Streck Donald
Wallace Linda J.
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