Weak signal resolver

A receiver for resolving at least one desired signal from among undesired signals in a composite signal, comprising:

• a splitter for splitting the composite signal into a first path and a second path;
• means for attenuating the at least one desired signal in the composite signal in the first path without converting the composite signal to baseband;
• and
• a combiner for combining the signal from the first path and the signal from the second path to produce an output signal containing the at least one desired signal in which the undesired signals have been attenuated,
• wherein the means for attenuating comprises a digital notch filter, the receiver further comprising:
• an analog-to-digital converter in the first path between the splitter and the digital notch filter;
• and
• a digital-to-analog converter in the first path between the digital notch filter and the combiner.

A receiver for resolving at least one desired signal from among undesired signals in a composite signal, comprising:

• a splitter for splitting the composite signal into a first path and a second path;
• means for attenuating the at least one desired signal in the composite signal in the first path without converting the composite signal to baseband;
• and
• a combiner for combining the signal from the first path and the signal from the second path to produce an output signal containing the at least one desired signal in which the undesired signals have been attenuated,
• wherein the means for attenuating comprises a digital notch filter, the receiver further comprising:
• an analog-to-digital converter in the first path between the splitter and the digital notch filter;
• and
• a digital-to-analog converter in the first path between the digital notch filter and the combiner,
• wherein the analog-to-digital converter has a lower resolution than the digital-to-analog converter.

A method for using a receiver to resolve at least one desired signal from among undesired signals in a composite signal, comprising:

• splitting the composite signal into a first path and a second path;
• attenuating the at least one desired signal in the composite signal in the first path without converting the composite signal to baseband;
• and
• combining the signal from the first path and the signal from the second path to produce an output signal containing the at least one desired signal in which the undesired signals have been attenuated,
• wherein the at least one desired signal comprises a first desired signal and a second desired signal, the method further comprising the step of attenuating the stronger of the first and second signals less than the weaker of the first and second signals to equalize the magnitudes of the first and second desired signals in the output signal.

A method for using a receiver to resolve at least one desired signal from among undesired signals in a composite signal, comprising:

• splitting the composite signal into a first path and a second path;
• attenuating the at least one desired signal in the composite signal in the first path without converting the composite signal to baseband;
• and
• combining the signal from the first path and the signal from the second path to produce an output signal containing the at least one desired signal in which the undesired signals have been attenuated,
• wherein the step of attenuating comprises the step of using a digital notch filter to attenuate the at least one desired signal, the method further comprising the steps of:
• digitizing the signal in the first path with an analog-to-digital converter before the desired signal is attenuated;
• and
• converting the signal in the first path to an analog signal with a digital-to-analog converter after the desired signal has been attenuated and before the signal in the first path has been combined with the signal in the second path.

A method for using a receiver to resolve at least one desired signal from among undesired signals in a composite signal, comprising:

• splitting the composite signal into a first path and a second path;
• attenuating the at least one desired signal in the composite signal in the first path without converting the composite signal to baseband;
• and
• combining the signal from the first path and the signal from the second path to produce an output signal containing the at least one desired signal in which the undesired signals have been attenuated,
• wherein the step of attenuating comprises the step of using a digital notch filter to attenuate the at least one desired signal, the method further comprising the steps of:
• digitizing the signal in the first path with an analog-to-digital converter before the desired signal is attenuated;
• and
• converting the signal in the first path to an analog signal with a digital-to-analog converter after the desired signal has been attenuated and before the signal in the first path has been combined with the signal in the second path,
• wherein the analog-to-digital converter digitizes the signal in the first path with less resolution than used by the digital-to-analog converter to convert the signal to analog.