Patent ID: 8208963

Claim:
A method, comprising: receiving at least one pilot signal from at least one of a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system during a predefined idle period dedicated for a control process; determining a phase difference between at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system on the basis of the at least one pilot signal received from the at least one of the plurality of antenna units; transmitting phase correction commands to a common base station of the at least one of the plurality of antenna units on the basis of the determined phase difference in order to synchronize carrier phases between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system; and compensating the phase difference between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system based on a carrier phase synchronization information received from the base station in response to the transmitted phase correction commands.