Apparatus and method for calibration for cooperative multiple input multiple output in a wireless communication system

A method of a Base Station (BS) for performing calibration in a wireless communication system supporting cooperative Multiple Input Multiple Output (MIMO) communication, the method comprising:

• receiving information of a reference Mobile Station (MS) from a serving BS of the reference MS;
• estimating an uplink channel matrix of the reference MS using pilot symbols received from the reference MS;
• transmitting pilot symbols for enabling the reference MS to estimate a downlink channel matrix;
• and
• determining, upon receiving a message comprising downlink channel information fed back from the reference MS, from the serving BS, a multi-cell calibration matrix using the uplink channel matrix and the downlink channel information.

An operating method of a Mobile Station (MS) for multi-cell calibration in a wireless communication system supporting cooperative Multiple Input Multiple Output (MIMO) communication, comprising:

• receiving a message indicating a start of multi-cell sounding calibration from a serving Base Station (BS);
• transmitting pilot symbols for enabling cooperative BSs to estimate an uplink channel matrix;
• estimating downlink channel matrixes of the cooperative BSs using pilot symbols received from the cooperative BSs;
• and
• transmitting downlink channel information to the serving BS.

A Base Station (BS) apparatus in a wireless communication system supporting cooperative Multiple Input Multiple Output (MIMO) communication, the apparatus comprising:

• a transmitter for transmitting a first message indicating a start of multi-cell sounding calibration to a reference Mobile Station (MS), and transmitting pilot symbols for enabling the reference MS to estimate a downlink channel matrix;
• an estimator for estimating an uplink channel matrix of the reference MS using pilot symbols received from the reference MS;
• a backhaul communicator for, when receiving downlink channel information of cooperative BSs from the reference MS, transmitting second messages including the downlink channel information to the cooperative BSs;
• and
• a controller for determining a multi-cell calibration matrix using the uplink channel matrix and the downlink channel information received from the reference MS.

A Base Station (BS) apparatus in a wireless communication system supporting cooperative Multiple Input Multiple Output (MIMO) communication, the apparatus comprising:

• a backhaul communicator for receiving information of a reference Mobile Station (MS) from a serving BS of the reference MS;
• an estimator for estimating an uplink channel matrix of the reference MS using pilot symbols received from the reference MS;
• a transmitter for transmitting pilot symbols for enabling the reference MS to estimate a downlink channel matrix;
• and
• a controller for, when receiving a message including downlink channel information fed back from the reference MS, from the serving BS, determining a multi-cell calibration matrix using the uplink channel matrix and the downlink channel information.

A Mobile Station (MS) apparatus in a wireless communication system supporting cooperative Multiple Input Multiple Output (MIMO) communication, comprising:

• a receiver for receiving a message indicating a start of multi-cell sounding calibration from a serving Base Station (BS);
• a transmitter for transmitting pilot symbols for enabling cooperative BSs to estimate an uplink channel matrix;
• an estimator for estimating downlink channel matrixes of the cooperative BSs using pilot symbols received from the cooperative BSs;
• and
• a controller for controlling to transmit downlink channel information to the serving BS.