Importance

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Abstract

A method of suppressing interference from remote transmitters operating to a first standard having frequencies overlapping those for a receiver operating to a second standard is provided. Such interference being increasingly common as a result of the deployment of multiple wireless transceivers within electronic devices either supporting multiple international standards, such as WiFi and WiMAX, or within typical wireless environments. Advantageously, the invention presents a means of actively cancelling interference from transmitters operating within the same frequency range as defined by the standard. The active cancellation accordingly allows improved performance for systems with very low received signal powers, such as GPS, in addition to wireless data communications standards. An exemplary embodiment providing active cancellation through delaying the portion of the received signal according to the first standard adjusting both the amplitude and phase by means of polar modulation prior to summing this signal with the received signal to provide a receive signal within which the first standard signal is nulled. Control of the polar modulator being determined in the exemplary embodiment by minimizing received power after passband limiting filters.

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First Claim