Spread aloha CDMA data communications

Details Spread aloha CDMA data communications Spread aloha CDMA data communications

1994-06-07

1996-07-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 93, 375200, 375206, H04J 1300

Patent

active

055373976

ABSTRACT:
Multiple transmitters transmit data signals using identical spreading codes. A single matched filter of a receiver receives all the signals. A broadcast timing control signal retards or advances timings of individual transmitters to offset the interleaved signals. A subtracting circuit subtracts first and strongest signals until a single signal remains, and then reinserts the subtracted signals in the receiver. The identical code spreading sequence used in all the transmitters and in the matched filter is selected from a specific class of codes known as maximum length shift register sequences in a length equal to 2 .sup.n -1 for integer values of n. The method provides multiple access to a data communications channel without prearranging times or querying availability, and with automatic offsetting of the identical form signals.

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