Programmable two-part matched filter for spread spectrum

Details Programmable two-part matched filter for spread spectrum Programmable two-part matched filter for spread spectrum

1995-05-25

1997-05-06

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375206, 375343, 36472411, H04B 1707, H04L 2722

Patent

active

056278551

ABSTRACT:
A spread-spectrum-matched-filter apparatus including a code generator, an in-phase-programmable-matched filter, a quadrature-phase-programmable-matched filter, an in-phase-frame-matched filter, a quadrature-phase-frame-matched filter, and a controller. The code generator generates replicas of a pilot-chip-sequence signal and a data-chip-sequence signal, which are used to set the programmable-impulse responses of the in-phase-programmable-matched filter and the quadrature-phase-programmable-matched filter. The programmable-impulse responses are alternately changed between that of the pilot-chip-sequence signal and the data-chip-sequence signal so that the in-phase-programmable-matched filter and the quadrature-phase-programmable-matched filter alternately detect the pilot-spread-spectrum channel and the data-spread-spectrum channel embedded in a received spread-spectrum signal, respectively. The in-phase-frame-matched filter and the quadrature-phase-frame-matched filter detect a despread-pilot-bit-sequence signal and generate a peak-pilot-correlation signal which can be used for timing of the controller as to when to trigger changing the programmable-impulse responses of the programmable-matched filters.

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J.H. Cafarella, W.M. Brown, E. Stern and J.A. Alusow, "Acoustoelectric Convolvers for Programmable Matched Filtering in Spread Systems," Proceedings of the IEEE, vol. 64, No. 5, pp. 756-759. May 1976.

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