Method for calibrating a smart-antenna array radio transceiver unit and calibrating system
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United States of America Patent
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Dec 17, 2002
Grant Date -
N/A
app pub date -
Mar 27, 2001
filing date -
Mar 27, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention relates to a method for calibrating a smart-antenna array of a wireless access system using TDD, which antenna array comprises antenna elements with a transmit and a receive branch each. In order to enable a time stable calibration, it is proposed that at least some of the antenna elements are selected in turns to be employed for transmitting broadcast messages. This provides time periods in which only one of said elements is transmitting. Each transmit branch is connected to at least one of the receive branches of another element, signals transmitted via these connections being evaluated for calibration. If receive branches are connected to transmit branches of several elements, it is ensured with the proposed selection that during the broadcast periods these receive branches receive at the most a signal from one element, thus avoiding the need for switches. The invention equally relates to a corresponding radio transceiver unit and a corresponding calibration system.
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