Transmission canceller for wireless local area network
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United States of America Patent
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Sep 27, 2011
Grant Date -
Oct 26, 2006
app pub date -
Apr 6, 2004
filing date -
Apr 6, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A frequency translating repeater (200) for use in a wireless local area network includes a cancellation unit. Canceller (402) is controlled by control (401) to provide an injection signal for canceling leakage in a receive signal path. Reference coupler (403) provides a reference signal from the transmit signal, injection coupler (404) injects a correction signal, and sample coupler (405) provides a sample for feedback. A processor (510) receives the sample signal through a detector (415). Although the present invention is intended for a frequency translating repeater, it has broad applications in radio transceivers in general. One specific application is with frequency division duplex (FDD) handsets or base stations utilizing CDMA technologies such as W-CDMA and IS-2000 or 1XEV-DV/DO.
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