Standalone canceller of narrow band interference for spread spectrum receivers
First Claim
1. A spread spectrum interference canceller for receiving from an antenna an RF analog input signal comprising (i) multiple direct-sequence spread spectrum signals, and (ii) additive multiple narrowband interferers, and for providing to a spread spectrum receiver an RF analog output signal comprising (i) multiple direct-sequence spread spectrum signals, and (ii) a reduced amount of narrowband interference compared to the interference in the RF analog input signal, said interference canceller comprisinga downconverter, responsive to said RF analog input signal, for translating the carrier frequency of said RF analog input signal from RF to a baseband intermediate frequency, and for amplifying and regulating the amplitude of said RF analog input signal and thereby generating a baseband analog input signal,a digital adaptive transversal filter, responsive to said baseband analog input signal, for digitizing said baseband analog input signal and thereby generating a baseband digital input signal, for generating a set of digital weight coefficients, for processing said baseband digital input signal through a transversal filter employing said digital weight coefficients to reduce the amount of narrowband interference and thereby generating a baseband digital output signal, and for converting to analog form said baseband digital output signal and thereby generating a baseband analog output signal, andan upconverter, responsive to said baseband analog output signal, for translating the carrier frequency of said baseband analog output signal from a baseband intermediate frequency to the RF frequency of said RF analog input signal, and thereby generating said RF analog output signal.
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Accused Products
Abstract
A spread spectrum interference canceller includes a downconverter for amplifying and translating the received signal from the radio frequency band to baseband, said signal comprising multiple direct sequence-spread spectrum signals and multiple narrowband interferers; a digital adaptive transversal filter for processing the downconverter output signal to suppress the narrowband interferers, and for regulating the amplitude of the resulting signal; an upconverter for translating the filter output from baseband to the radio frequency band, so that the resulting interference canceller output can be processed by a spread spectrum receiver.
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Citations
10 Claims
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1. A spread spectrum interference canceller for receiving from an antenna an RF analog input signal comprising (i) multiple direct-sequence spread spectrum signals, and (ii) additive multiple narrowband interferers, and for providing to a spread spectrum receiver an RF analog output signal comprising (i) multiple direct-sequence spread spectrum signals, and (ii) a reduced amount of narrowband interference compared to the interference in the RF analog input signal, said interference canceller comprising
a downconverter, responsive to said RF analog input signal, for translating the carrier frequency of said RF analog input signal from RF to a baseband intermediate frequency, and for amplifying and regulating the amplitude of said RF analog input signal and thereby generating a baseband analog input signal, a digital adaptive transversal filter, responsive to said baseband analog input signal, for digitizing said baseband analog input signal and thereby generating a baseband digital input signal, for generating a set of digital weight coefficients, for processing said baseband digital input signal through a transversal filter employing said digital weight coefficients to reduce the amount of narrowband interference and thereby generating a baseband digital output signal, and for converting to analog form said baseband digital output signal and thereby generating a baseband analog output signal, and an upconverter, responsive to said baseband analog output signal, for translating the carrier frequency of said baseband analog output signal from a baseband intermediate frequency to the RF frequency of said RF analog input signal, and thereby generating said RF analog output signal.
Specification