Systems and methods for suppressing close-in phase noise and reciprocal mixing noise in signals

A method comprising:

• mixing a radiofrequency signal with a first local oscillator signal in a first signal path to provide a first downconverted signal, the first local oscillator signal produced using a signal generator, wherein the radiofrequency signal includes a desired signal;
• mixing the radiofrequency signal with a second local oscillator signal in a second signal path to provide a second downconverted signal, the second local oscillator signal produced using the signal generator;
• controlling phase noise of the first local oscillator signal attributable to phase noise of the signal generator and phase noise of the second local oscillator signal attributable to phase noise of the signal generator to be differentiated;
• and
• performing processing of a first observed signal from the first signal path and a second observed signal from the second signal path to extract the desired signal, wherein the first observed signal is produced in dependence on the mixing of the radiofrequency signal with the first local oscillator signal and wherein the second observed signal is produced in dependence on the mixing of the radiofrequency signal with the second local oscillator signal.

A receiver comprising:

• a first mixer disposed in a first signal path, wherein the first mixer performs mixing of a radiofrequency signal with a first local oscillator signal to provide a first downconverted signal, the first local oscillator signal is produced using a signal generator, wherein the radiofrequency signal includes a desired signal;
• a second mixer disposed in a second signal path, wherein the second mixer performs mixing of the radiofrequency signal with a second local oscillator signal to provide a second downconverted signal, the second local oscillator signal is produced using the signal generator;
• wherein receiver is configured for performing processing of a first observed signal from the first signal path and a second observed signal from the second signal path to extract the desired signal, wherein the first observed signal is produced in dependence on the mixing by the first mixer and wherein the second observed signal is produced in dependence on the mixing by the second mixer, and
• wherein the receiver is configured so that phase noise of the first local oscillator signal attributable to phase noise of the signal generator and phase noise of the second local oscillator signal attributable to phase noise of the signal generator are linearly scaled relative to one another.

A receiver comprising:

• a first mixer disposed in a first signal path, wherein the first mixer performs mixing of a radiofrequency signal with a first local oscillator signal to provide a first downconverted signal, the first local oscillator signal is produced using a signal generator, wherein the radiofrequency signal includes a desired signal;
• a second mixer disposed in a second signal path, wherein the second mixer performs mixing of the radiofrequency signal with a second local oscillator signal to provide a second downconverted signal, the second local oscillator signal is produced using the signal generator;
• wherein receiver is configured for performing processing of a first observed signal from the first signal path and a second observed signal from the second signal path to extract the desired signal, wherein the first observed signal is produced in dependence on the mixing by the first mixer and wherein the second observed signal is produced in dependence on the mixing by the second mixer, and
• wherein the radiofrequency signal includes the desired signal and an interferer signal, wherein the receiver is configured, by extracting of the desired signal, to suppress reciprocal mixing phase noise distortion attributable to spreading of the spectrum of the interferer signal by phase noise from the signal generator.