Standalone canceller of narrow band interference for spread spectrum receivers

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.