Apparatus and method for calibrating reception signal in mobile communication system
First Claim
1. An apparatus for calibrating a reception signal of an array antenna in a mobile communication system, comprising:
- a reference signal generator which outputs a plurality of reference signals having same phases, by calibrating a phase of a locally generated signal; and
an antenna array which receives a radio signal through a plurality of antenna paths by a plurality of reference signals, and calibrating distortion of each array antenna path, wherein the reference signal generating unit comprises;
a splitter which divides an RF signal into as many signals as a number of antennas in the array;
a phase detector which detects phase information of the divided signals; and
a phase shifter which uniformly controls phases of the divided signals based on the phase information.
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Abstract
A method for calibrating a reception signal in a smart antenna system includes: locally generating a reference signal, converting the reference signal into an RF signal, and dividing the RF signal into as many signals as the number of antennas.
Phase information of the divided RF signals is then detected. This is followed by outputting a plurality of reference signals having the same phases by performing phase shifting operation, converting an RF signal into a baseband signal, and calibrating the baseband signal by multiplying the baseband signal by a calibration vector. An apparatus for calibrating a reception signal in a smart antenna system includes a reference signal generating unit and an array antenna unit. The reference signal generating unit includes a local reference signal generator, an RF converter, a splitter, a phase detector, and a phase shifter. The array antenna unit includes an antenna, a front-end part, an RF transmitter, an RF receiver, and a baseband processor. A process of calculating complex conjugate numbers and a complex conjugate number calculator may also be included. In this method, because the same reference signals are input into the array antenna unit, the calibration process may be greatly simplified.
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Citations
20 Claims
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1. An apparatus for calibrating a reception signal of an array antenna in a mobile communication system, comprising:
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a reference signal generator which outputs a plurality of reference signals having same phases, by calibrating a phase of a locally generated signal; and
an antenna array which receives a radio signal through a plurality of antenna paths by a plurality of reference signals, and calibrating distortion of each array antenna path, wherein the reference signal generating unit comprises;
a splitter which divides an RF signal into as many signals as a number of antennas in the array;
a phase detector which detects phase information of the divided signals; and
a phase shifter which uniformly controls phases of the divided signals based on the phase information. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for calibrating a reception signal of an array antenna system in a mobile communication system, comprising:
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outputting a plurality of reference signals having same phases by calibrating a phase of a locally generated signal;
receiving radio signals through a plurality of antenna paths using the plurality of reference signals, and converting the radio signals into baseband signals; and
calibrating the baseband signals, wherein outputting the plurality of reference signals comprises;
dividing an RF signal into a number of signals;
detecting phase information of the divided signals; and
outputting a plurality of reference signals having the same phases by performing phase shifting after the phase information is detected. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A calibration apparatus, comprising:
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a splitter configured to split an RF converted local ref signal into a plurality of signals;
a phase detector configured to detect phases of the plurality of signals; and
a phase shifter configured to shift a phase of the plurality of signals to be the same based on the detected phases, and to output the plurality of signals having the same phases to an antenna array. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification