Method and apparatus for detecting and compensating for undesired phase shift in a radio transceiver
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United States of America Patent
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Apr 13, 1999
Grant Date -
N/A
app pub date -
Sep 16, 1996
filing date -
Sep 16, 1996
priority date (Note) -
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Abstract
The present invention provides a method and apparatus for detecting and compensating for transmitter phase shift in a radio transmitter. A local oscillator generates a local oscillator signal. A modulator such as an I/Q modulator modulates input signals onto the local oscillator signal to generate a forward signal. That forward signal is amplified and otherwise prepared for transmission via an antenna. The transmitted signal is detected, and a phase adjuster substantially continuously detects and cancels undesired phase shifts in the detected signal caused by elements in the radio chain. A specific, example embodiment of the present invention is provided in a Cartesian feedback system wherein the phase of the feedback signal is detected and aligned with the phase of the original modulated signal, providing uncorrupted I and Q baseband feedback signals.
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