Radio device and method of calibration thereof
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United States of America Patent
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Mar 22, 2005
Grant Date -
N/A
app pub date -
Feb 1, 2001
filing date -
Aug 5, 1998
priority date (Note) -
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Abstract
An adaptive array radio base station comprises at least three antenna elements (ANT.sub.j (j=1, 2, . . . , n)) and a signal processing circuit (20). In calibration, the difference in a phase rotation quantity and the difference in an amplitude fluctuation quantity between a transmission circuit and a receiving circuit in each transmission system are estimated on the basis of a known signal transmitted from each transmission system and a received signal measured in each transmission system. A phase rotation quantity of a phase shifter (PS.sub.j) and an amplitude fluctuation quantity of an attenuator (ATT.sub.j) are set on the basis of the results of the estimation. Thus provided are a radio apparatus and a calibration method capable of calibrating transmission characteristics of the transmission circuit and the receiving circuit in a simple structure at a low cost without providing a specific measuring circuit.
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