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

1997-03-20

1998-09-01

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375206, 375343, 36472411, H04B 1707, H04L 2722

Patent

active

058021027

ABSTRACT:
A spread-spectrum-matched-filter apparatus including a code generator, a programmable-matched filter, a 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 response of the programmable-matched filter. The programmable-impulse response is alternately changed between that of the pilot-chip-sequence signal and the data-chip-sequence signal so that the programmable-matched filter alternately detects the pilot-spread-spectrum channel and the data-spread-spectrum channel embedded in a received spread-spectrum signal. The frame-matched filter detects a despread-pilot-bit-sequence signal and generates a peak-pilot-correlation signal which can be used for timing of the controller as to when to trigger changing the programmable-impulse response of the programmable-matched filter.

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

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