Apparatus and method for measuring and compensating delay between main base station and remote base station interconnected by an optical cable

A method for measuring and compensating propagation delay between a main base station and a remote base station according to a synchronous digital hierarchy (SDH) standard, the main base station being connected to the remote base station by an optical cable, the method comprising:

• inserting a test pattern into an overhead part of an SDH frame to transmit the SDH frame to the remote base station and receiving the SDH frame looped back by the remote base station;
• detecting at least one frame alignment word (FAW) from the SDH frame;
• producing a value of propagation delay between the main base station and the remote base station by adding propagation delay measured according to a count value of round trip delay of the SDH frame containing the test pattern to a delay error calculated from detection information of the FAW;
• and
• compensating for propagation delay of a baseband signal to be transmitted to the remote base station in response to the propagation delay value produced by a controller.

A method for compensating propagation delay between a main base station and a remote base station according to a synchronous digital hierarchy (SDH) standard, the main base station being connected to the remote base station by an optical cable, the method comprising:

• receiving propagation delay information indicating a propagation delay value from the main base station through the optical cable;
• converting a baseband signal received from the main base station into an intermediate frequency (IF) signal, and compensating for propagation delay of the IF signal using a time unit less than one chip duration according to the received propagation delay information;
• and
• converting the compensated IF signal into an RF signal and radiating the RF signal through an antenna.