Communications terminal having a receiver and method for removing known interferers from a digitized intermediate frequency signal

A receiver for substantially removing a centered unmodulated interferer from an intermediate frequency signal, said receiver comprising:

• at least one combination of a mixer and filter for translating in an analog domain a received signal to the intermediate frequency signal while maintaining separation from baseband;
• a digitizer for digitally translating the intermediate frequency signal containing the centered unmodulated interferer from said analog domain into a digital domain;
• an interference cancellation system, coupled to the digitizer, for substantially removing a DC offset within the digitally translated intermediate frequency signal, said DC offset due to the centered unmodulated interferer being located within a middle of a channel used by the receiver;
• and
• a digital demodulator, coupled to the interference cancellation system, for demodulating the digitally translated intermediate frequency signal after removing the DC offset therefrom.

A receiver for substantially removing an off-centered unmodulated interferer or a modulated interferer each having a known waveform from an intermediate frequency signal, said receiver comprising:

• at least one combination of a mixer and filter for translating in an analog domain a received signal to the intermediate frequency signal while maintaining separation from baseband;
• a digitizer for digitally translating the intermediate frequency signal from said analog domain into a digital domain, said intermediate frequency signal containing the off-centered unmodulated interferer or the modulated interferer;
• an interference cancellation system, coupled to the digitizer, for substantially removing the known waveform from the digitally translated intermediate frequency signal, said known waveform associated with the off-centered unmodulated interferer or the modulated interferer;
• and
• a digital demodulator, coupled to the interference cancellation system, for demodulating the digitally translated intermediate frequency signal after removing the known waveform therefrom.

A method for substantially removing a known interferer from an intermediate frequency signal, said method comprising the steps of:

• receiving a signal;
• translating in an analog domain the signal to the intermediate frequency signal while maintaining separation from baseband;
• digitally translating the intermediate frequency signal containing the known interferer from said analog domain into a digital domain;
• removing the known interferer from the digitally translated intermediate frequency signal;
• and
• demodulating the digitally translated intermediate frequency signal after removing the known interferer therefrom.