Automatic array calibration scheme for wireless point-to-multipoint communication networks
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United States of America Patent
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Feb 12, 2002
Grant Date -
N/A
app pub date -
Apr 7, 2000
filing date -
Apr 7, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic array calibration apparatus which is capable of periodically calibrating beamforming offsets using internally generated calibration and test signals. The apparatus preferably includes a calibration signal generating unit which generates a continuous wave calibration signal which is input into a receiving channel as the input signal. I/Q signals are obtained from reception data channels which have been provided with the calibration signal. The apparatus also includes a loop back operation in which test signals are injected in transmission data channels, and are prepared for transmission at a transmission unit. The transmission signal is looped back to the receiving unit and I/Q signals are obtained from reception data channels supplied with the transmission signals.
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