Method and apparatus for improved autocorrelation in biphase mod

Details Method and apparatus for improved autocorrelation in biphase mod Method and apparatus for improved autocorrelation in biphase mod

1997-04-21

1999-07-27

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

375343, 342145, 708422, H04B 1500, H04K 100, H04L 2730

Patent

active

059302925

ABSTRACT:
The present invention describes a method and apparatus for improving the autocorrelation performance in spread spectrum radar and communications systems by using a tri-state digital correlator to demodulate the received biphase modulated waveform. The tri-state correlator (100) includes a multiplexer (112) having a code input for receiving a tri-state code sequence, and three inputs each for receiving a sequence of data words including a first input for receiving a digitized signal data word, a second input for receiving an inverted digitized signal data word, and a third input for receiving a zero data word. The multiplexer includes an output and a means for producing a sequence of data words at the output, said means presenting at the output exactly one of the three data words appearing at either the first, second, or third input depending on which of the three code states appears at the code input. The present invention also describes the manner in which the tri-state code sequence is constructed from a binary code sequence to effect a significant improvement in the autocorrelation performance.

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patent: 5646626 (1997-07-01), Willis
patent: 5646627 (1997-07-01), Willis et al.
patent: 5684727 (1997-11-01), Campbell et al.
patent: 5809064 (1998-09-01), Fenton et al.

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