Calibration apparatus and method for multicell multiple input multiple output transmission in multiple antenna system

An operating method of a Base Station (BS) for performing calibration for multicell Multiple Input Multiple Output (MIMO) transmission in a multiple antenna system, the method comprising:

• negotiating a multi-BS joint processing with a Mobile Station (MS);
• transmitting a control message comprising information instructing multi BS calibration for sounding based on the multi-BS joint processing, to the MS;
• after transmitting the control message, receiving a sounding sequence comprising a phase of a downlink channel per subcarrier of the MS over a corresponding sounding symbol interval;
• and
• compensating for mismatch between the phase of the downlink channel and a phase of an uplink channel from the received sounding sequence.

An apparatus of a Mobile Station (MS) for performing calibration for multicell Multiple Input Multiple Output (MIMO) transmission in a multiple antenna system, the apparatus comprising:

• a controller for negotiating a multi-Base Station (BS) joint processing with a BS;
• a receiver for receiving a control message comprising information instructing multi BS calibration for sounding based on the multi BS joint processing, from the BS;
• a sounding mapper for, when the control message is received, generating a second sounding sequence by mapping estimated phases of downlink channels per subcarrier of BSs involving the multi-BS joint processing, to a first sounding sequence allocated from the BS;
• and
• a transmitter for transmitting the second sounding sequence, comprising the phases of the downlink channels per subcarrier, over a sounding symbol interval with respect to each of the BSs involving the multi-BS joint processing.

An apparatus of a Base Station (BS) for performing calibration for multicell Multiple Input Multiple Output (MIMO) transmission in a multiple antenna system, the apparatus comprising:

• a controller for negotiating a multi-BS joint processing with a Mobile Station (MS);
• a transmitter for transmitting a control message comprising information instructing multi-BS calibration for sounding based on the multi-BS joint processing, to the MS;
• a receiver for, after the control message is sent, receiving a sounding sequence comprising a phase of a downlink channel per subcarrier of the MS over a corresponding sounding symbol interval;
• and
• a phase shift compensator for compensating for mismatch between the phase of the downlink channel and a phase of an uplink channel from the received sounding sequence.