Frequency hopping band-stop filter

A method of reducing interference in a communications system, comprising a tunable filter circuit for receiving an input signal and outputting an output signal, and a tuning processor for generating a plurality of filter control signals for said tunable filter circuit, the method comprising:

• generating said plurality of filter control signals based on at least one channel control signal associated with a current communications channel,
• generating said output signal with said tunable filter circuit by processing said input signal based at least on said plurality of filter control signals;
• sampling an input power of said input signal;
• sampling an output power of said output signal;
• and
• modifying said plurality of filter control signals based on a comparison of said input and said output powers,
• wherein said plurality of control signals configure said tunable filter circuit to attenuate at least a portion of said input signal if a difference between said input power and said output power is less than a threshold value.

A method of reducing interference in a communications system, comprising a tunable filter circuit for receiving an input signal and outputting an output signal, and a tuning processor for generating a plurality of filter control signals for said tunable filter circuit, the method comprising:

• generating said plurality of filter control signals based on at least one channel control signal associated with a current communications channel,
• generating said output signal with said tunable filter circuit by processing said input signal based at least on said plurality of filter control signals;
• sampling an input power of said input signal;
• sampling an output power of said output signal;
• and
• modifying said plurality of filter control signals based on a comparison of said input and said output powers;
• wherein said plurality of control signals configure said tunable filter circuit to attenuate at least a portion of said input signal if a difference between said input power and said output power is less than a threshold value;
• and
• wherein said sampling said input power further comprises sampling said input signal using a first directional coupler having a first incident port for receiving said input signal, a first transmitted port coupled to an input of said tunable filter circuit, and a first coupled port for providing said sampled input power to said tuning processor, and wherein said sampling said output power further comprises sampling said output signal using a second directional coupler having a second incident port coupled to an output of said tunable filter circuit, a second transmitted port for providing said output signal, and a second coupled port for providing said sampled output power to said tuning processor.

A method of reducing interference in a communications system, comprising a tunable filter circuit for receiving an input signal and outputting an output signal, and a tuning processor for generating a plurality of filter control signals for said tunable filter circuit, the method comprising:

• generating said plurality of filter control signals based on at least one channel control signal associated with a current communications channel,
• generating said output signal with said tunable filter circuit by processing said input signal based at least on said plurality of filter control signals;
• sampling an input power of said input signal;
• sampling an output power of said output signal;
• and
• modifying said plurality of filter control signals based on a comparison of said input and said output powers;
• wherein said plurality of control signals configure said tunable filter circuit to attenuate at least a portion of said input signal if a difference between said input power and said output power is less than a threshold value;
• and
• wherein said generating said plurality of filter control signals further comprises accessing a plurality of stored control signal configurations associated with a plurality of communications channels and generating said plurality of filter control signals based on at least one of said plurality of control signal configurations associated with said current communications channel.

A method of reducing interference in a communications system, comprising a tunable filter circuit for receiving an input signal and outputting an output signal, and a tuning processor for generating a plurality of filter control signals for said tunable filter circuit, the method comprising:

• generating said plurality of filter control signals based on at least one channel control signal associated with a current communications channel,
• generating said output signal with said tunable filter circuit by processing said input signal based at least on said plurality of filter control signals;
• sampling an input power of said input signal;
• sampling an output power of said output signal;
• and
• modifying said plurality of filter control signals based on a comparison of said input and said output powers;
• wherein said plurality of control signals configure said tunable filter circuit to attenuate at least a portion of said input signal if a difference between said input power and said output power is less than a threshold value;
• and
• wherein modifying further comprises generating an enable signal for said tuning processor if said difference is less than a threshold value and adjusting said plurality of filter control signals to reduce attenuation of said input signal in said tunable filter circuit if said enable signal is not present.

A digitally-tunable filter circuit, comprising:

• a tunable filter circuit comprising a plurality of fixed filter elements for processing an input signal to generate an output signal and a plurality of selectable filter elements for modifying a frequency response of said plurality of fixed filter elements based on at least a plurality of filter control signals;
• an input power sampler for sampling an input power of said input signal;
• an output power sampler for sampling an output power of said output signal;
• a tuning processor for generating said plurality of filter control signals based on at least one frequency hopping (FH) control signal associated with a current FH victim receive frequency for said input signal and a comparison of said input and said output powers,
• wherein said plurality of control signals configure said tunable filter circuit to attenuate a portion of said input signal if a difference between said input power and said output power is less than a threshold value.