Patent ID: 8422426

Claim:
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: transmitting a first message indicating a start of multi-cell sounding calibration from the BS to a reference Mobile Station (MS); receiving MS pilot symbols at the BS from the reference MS; estimating an uplink channel matrix of the reference MS using the MS pilot symbols received from the reference MS; transmitting BS pilot symbols, from the BS to the reference MS, which enables the reference MS to estimate a downlink channel matrix; receiving downlink channel information of the BS and cooperative BSs at the BS from the reference MS; transmitting second messages including the downlink channel information from the BS to the cooperative BS; and determining, at the BS, a multi-cell calibration matrix using the uplink channel matrix and the downlink channel information received from the reference MS.