Antenna array calibration in wireless communication systems
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United States of America Patent
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May 15, 2001
Grant Date -
N/A
app pub date -
Sep 14, 1998
filing date -
Jan 8, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus are provided for easily and accurately calibrating an antenna array in a multipath environment. A calibration table containing spatial signature data together with corresponding location data is used to calibrate the antenna array, i.e. to determine the array response in various directions. The calibration table includes a set of calibrated signal covariances R.sub.1, . . . , R.sub.N together with a set of N corresponding geographical locations. From this data, a set of array calibration vectors {a(.theta.)} is determined, where each vector a(.theta.) characterizes the complex signal response of the antenna array in the direction .theta.. Once the array calibration vectors are determined, this information can be used for direction finding, beamforming, and other enhancements to the performance of the communication system.
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