Combined digital filter and correlator

Details Combined digital filter and correlator Combined digital filter and correlator

2007-06-08

2010-12-14

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S343000, C375S350000

Reexamination Certificate

active

07852908

ABSTRACT:
The present invention is a combined digital filter and correlator, which is used in a radio frequency (RF) receiver, and takes advantage of common structures used in both digital filters and correlators. Specifically, a digital filter may mix (multiply) digital filter coefficients with samples of a down-converted RF signal, and then sum the resulting products to provide filtered samples of the down-converted RF signal. Similarly, a correlator may mix (multiply) a reference code with the samples of the down-converted RF signal, and then sum the resulting products to provide a correlation of the down-converted RF signal. The present invention combines the digital filter coefficients and the reference code into a modified reference code, which is then mixed with the samples of the down-converted RF signal and summed to provide a filtered correlation of the down-converted RF signal.

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