Differentially coherent combining for electronic article...

Details Differentially coherent combining for electronic article... Differentially coherent combining for electronic article...

2005-06-14

2005-06-14

Swarthout, Brent A. (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S568100, C340S572200, C340S572400

Reexamination Certificate

active

06906629

ABSTRACT:
Conventional EAS systems, such as ULTRA*MAX, use noncoherent detection and a highly nonlinear post detection combining algorithm. It is well known that using the phase information that is present in the received signal has advantages in detection performance. This is difficult to do in conventional ULTRA*MAX receiver because of the combination of a narrow signal bandwidth and short receive window duration. A method to incorporate signal phase into the detector by differential coherent combining is provided, which significantly improves processing gain that was not previously obtainable.

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