Transmitter crosstalk cancellation in multi-standard wireless transceivers
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United States of America Patent
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Issued Date -
Sep 11, 2008
app pub date -
Mar 6, 2007
filing date -
Mar 6, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of suppressing interference from a transmitter operating to a first standard to a local 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 supporting multiple international standards, such as WiFi and WiMAX. Advantageously, the invention presents a means of actively cancelling interference both from transmitters operating within the same frequency range as defined by the standard as well as those operating in different frequency ranges. 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 a portion of the transmitted signal and adjusting both the amplitude and phase by means of polar modulation prior to summing this signal with the detected signal to provide a receive signal within which the transmit signal is nulled.
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