Differential correlator for spread spectrum communication...

Details Differential correlator for spread spectrum communication... Differential correlator for spread spectrum communication...

H - Electricity

04

K

325/3

H04K 1/04 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2002883

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 previously received chip of spread spectrum signal, 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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