Pulse or digital communications – Repeaters – Testing
Patent
1988-11-15
1990-10-16
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
H04L 102
Patent
active
049641387
ABSTRACT:
A spread spectrum communications system includes an encoder for differentially encoding a spread spectrum spreading code sequence in accordance with an input data signal. Each chip of the spreading code sequence is inverted, or not inverted, relative to the polarity of a corresponding chip of the spreading code sequence a fixed time delay previously, depending on whether the input data is a logic one or zero, respectively. At the receiver, the data is recovered in a differential data decoder wherein the presently received chip of the spread spectrum signal and a corresponding previously received chip of spread spectrum signal, received a fixed time delay previously, are compared one chip at a time. Since it is the spreading code sequence that is differentially encoded and differentially decoded, there is no need for a synchronized code sequence generator at the receiver, and data synchronization is achieved after one cycle time of the received spread spectrum spreading code sequence has elapsed.
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Cripps Peter K.
Nease Greg A.
Agilis Corporation
Cangialosi Salvatore
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