Method for calibrating an electronically phase-controlled group antenna in radio communications systems
First Claim
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1. A method for calibrating an electronically phase-controlled group antenna having n antenna elements in a radio communications system, comprising:
- in the case of an antenna calibration in the upward direction, transmitting a reference signal from a shared reference antenna to each of the n antenna elements, the reference signal having a different transit time to the n antenna elements;
in the case of an antenna calibration in the upward direction, passing a measuring signal from each of the n antenna elements to a device for error correction;
in the case of an antenna calibration in the upward direction, ascertaining an error correction value for each of the n antenna elements in relation to a reference point, the error correction values being determined at the device for error correction based on corresponding measuring signals;
in the case of an antenna calibration in the downward direction, transmitting a reference signal from each of the n antenna elements to the reference antenna, such that each antenna element has an assigned reference signal and the n antenna elements form n reference signals at the same time;
in the case of an antenna calibration in the downward direction, receiving the reference signals in superposed form at the reference antenna, each of the reference signals having a different transit time;
in the case of an antenna calibration in the downward direction, passing a shared measuring signal from the reference antenna to the device for error correction, the shared measuring signal carrying information regarding the transit time of each of the reference signals; and
in the case of an antenna calibration in the downward direction, ascertaining from the shared measuring signal an error correction value for each of the n antenna elements in relation to the reference point.
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Abstract
An electronically phase-controlled group antenna is calibrated in radio communications systems, using a reference point shared by all the reference signals. In the downlink, reference signals which can be distinguished from one another are simultaneously transmitted by individual antenna elements of the group antenna and are suitably separated after reception at the shared reference point.
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Citations
21 Claims
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1. A method for calibrating an electronically phase-controlled group antenna having n antenna elements in a radio communications system, comprising:
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in the case of an antenna calibration in the upward direction, transmitting a reference signal from a shared reference antenna to each of the n antenna elements, the reference signal having a different transit time to the n antenna elements;
in the case of an antenna calibration in the upward direction, passing a measuring signal from each of the n antenna elements to a device for error correction;
in the case of an antenna calibration in the upward direction, ascertaining an error correction value for each of the n antenna elements in relation to a reference point, the error correction values being determined at the device for error correction based on corresponding measuring signals;
in the case of an antenna calibration in the downward direction, transmitting a reference signal from each of the n antenna elements to the reference antenna, such that each antenna element has an assigned reference signal and the n antenna elements form n reference signals at the same time;
in the case of an antenna calibration in the downward direction, receiving the reference signals in superposed form at the reference antenna, each of the reference signals having a different transit time;
in the case of an antenna calibration in the downward direction, passing a shared measuring signal from the reference antenna to the device for error correction, the shared measuring signal carrying information regarding the transit time of each of the reference signals; and
in the case of an antenna calibration in the downward direction, ascertaining from the shared measuring signal an error correction value for each of the n antenna elements in relation to the reference point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification