Pulse or digital communications – Repeaters – Testing
Patent
1995-05-01
1998-08-04
Pham, Chi H.
Pulse or digital communications
Repeaters
Testing
375210, 380 31, 380 42, H04B 1707, H04K 100
Patent
active
057905916
ABSTRACT:
A spread spectrum transmitter for generating a plurality of spread spectrum codes comprises a shift register having a plurality of stages, with a plurality of tap sets connected to selected ones of said stages. Each tap set defines a different spread spectrum code, which may be maximal or non-maximal. Outputs from the tap sets are combined using exclusive-OR gates and fed back to through a table of logic gates to the input of the shift register. A serial data register is loaded from a data stream and clocked periodically into a parallel data register. The parallel data register corresponds to a data symbol and is connected to the table, whereby one of the spread spectrum codes at a time is selected. A code portion of the spread spectrum code up to a designated length is generated for each data symbol. More than one code portion may be simultaneously sent using offset quadrature phase shift keying. A receiver may detect the code portion or code portions sent by delaying the received signal and combining it with a plurality of delayed versions thereof, the delay period for each delayed version corresponding to the tap locations in the tap set of the transmitter shift register.
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Dixon Robert C.
Gold Robert
Luther William
Omnipoint Corporation
Pham Chi H.
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