Apparatus and method for calibration for relay station in multiple antenna communication system

A calibration method in a multiple antenna communication system which supports a Relay Station (RS), the method comprising:

• estimating, at a modem stage, a downlink path channel by transmitting and receiving a downlink calibration signal;
• switching, at a calibration controller, so that the modem stage transmits and receives one of an uplink calibration signal and the downlink calibration signal;
• estimating, at the modem stage, an uplink path channel by transmitting and receiving the uplink calibration signal;
• determining, at the modem stage, calibration coefficients per path not to generate a phase and amplitude difference with respect to the estimated uplink path channel and the estimated downlink path channel;
• and
• applying the calibration coefficients per path to corresponding antennas respectively.

A calibration method in a multiple antenna communication system which supports a Relay Station (RS), the method comprising:

• when a modem stage sends a downlink calibration signal, receiving, at a calibrator, the downlink calibration signal and estimating a downlink path channel;
• when the calibrator sends an uplink calibration signal, receiving, at the modem stage, the uplink calibration signal and estimating an uplink path channel;
• determining, at the modem stage, calibration coefficients per path to make a phase and amplitude difference with respect to the estimated uplink path channel and the estimated downlink path channel be a first value;
• and
• applying the calibration coefficients per path to corresponding antennas respectively.

A calibration method in a multiple antenna communication system which supports a Relay Station (RS), the method comprising:

• estimating, at a modem stage, a downlink path channel by transmitting and receiving a downlink calibration signal;
• switching, at a calibration controller, so that the modem stage transmits and receives one of an uplink calibration signal and the downlink calibration signal;
• estimating, at the modem stage, an uplink path channel by transmitting and receiving the uplink calibration signal;
• determining, at the modem stage, calibration coefficients per path to make a phase and amplitude difference with respect to the estimated uplink path channel and the estimated downlink path channel be a first value;
• and
• applying the calibration coefficients per path to corresponding antennas respectively.

A calibration apparatus in a multiple antenna communication system which supports a Relay Station (RS), the apparatus comprising:

• a modem stage for, when a downlink calibration signal is transmitted, receiving the downlink calibration signal from a calibrator and estimating a downlink path channel;
• and
• the calibrator for, when an uplink calibration signal is transmitted, receiving the uplink calibration signal from the modem stage and estimating an uplink path channel, p1 wherein the modem stage determines calibration coefficients per path not to generate a phase and amplitude difference with respect to the estimated uplink path channel and the estimated downlink path channel, and
• the modem stage applies the calibration coefficients per path to corresponding antennas respectively.

A calibration apparatus in a multiple antenna communication system which supports a Relay Station (RS), the apparatus comprising:

• a modem stage for estimating a downlink path channel by transmitting and receiving a downlink calibration signal;
• and
• a calibration controller for switching so that the modem stage transmits and
• receives one of an uplink calibration signal and the downlink calibration signal, wherein the modem stage estimates an uplink path channel by transmitting and receiving the uplink calibration signal,
• the modem stage determines calibration coefficients per path not to generate a phase and amplitude difference with respect to the estimated uplink path channel and the estimated downlink path channel, and
• the modem stage applies the calibration coefficients per path to corresponding antennas respectively.

A calibration apparatus in a multiple antenna communication system which supports a Relay Station (RS), the apparatus comprising:

• a modem stage for, when a downlink calibration signal is transmitted, receiving the downlink calibration signal from a calibrator and estimating a downlink path channel;
• and
• the calibrator for, when an uplink calibration signal is transmitted, receiving the uplink calibration signal from the modem stage and estimating an uplink path channel,
• wherein the modem stage determines calibration coefficients per path to make a phase and amplitude difference with respect to the estimated uplink path channel and the estimated downlink path channel be a first value, and
• applies the calibration coefficients per path to corresponding antennas respectively.

A calibration apparatus in a multiple antenna communication system which supports a Relay Station (RS), the apparatus comprising:

• a modem stage for estimating a downlink path channel by transmitting and receiving a downlink calibration signal;
• and
• a calibration controller for switching so that the modem stage transmits and receives one of an uplink calibration signal and the downlink calibration signal,
• wherein the modem stage estimates an uplink path channel by transmitting and receiving the uplink calibration signal,
• the modem stage determines calibration coefficients per path to make a phase and amplitude difference with respect to the estimated uplink path channel and the estimated downlink path channel be a first value, and
• the modem stage applies the calibration coefficients per path to corresponding antennas respectively.