The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 14, 1999
Filed:
May. 08, 1997
Bradley P Badke, Chandler, AZ (US);
Sicom, Inc., Scottsdale, AZ (US);
Abstract
An interference-tolerant spread-spectrum receiver (20) includes an FIR (finite impulse response) filter network (32) and a correlator/detector (34). The filter network (32) contains a pair of FIR filters (36) substantially identical to each other. A signal passes directly into the first filter (36'), but is delayed a predetermined amount of time before passing into the second filter (36'). Each of the filters (36) contains means for sampling (62) and windowing (70) the signal in the time domain; transforming (118) the signal to the frequency domain; limiting (130) and despreading (160) the signal in the frequency domain; and transforming (168) the signal back to the time domain. The signal from the first filter (36') is delayed the predetermined amount of time to resynchronize signals from both filters (36), which signals are then combined into a single signal. The combined signal is then passed into the correlator/detector (34), which determines the presence or absence of a spread-spectrum signal.