Patent ID: 6477196
Filing Date: 2002-11-05
Classification: H04B

Abstract:
A method of excising one or more narrow-band interfering signals and obtaining a desired signal in a direct sequence spread spectrum communications receiver comprising:receiving an input signal containing the one or more narrow-band interfering signals and a desired direct sequence spread spectrum signal; maintaining a constant input signal level; converting the input signal into a baseband signal; performing a spectral analysis on the baseband signal to obtain spectral analysis output signals; determining which spectral analysis output signals contain the one or more narrow-band interfering signals; positioning band-reject filters to filter the baseband signal to excise the one or more narrow-band interfering signals according to the spectral analysis output signals determined to contain the one or more narrow-band interfering signals; and demodulating the desired direct sequence spread spectrum signal in the filtered baseband signal to obtain the desired signal.