Method of cyclic delay diversity with the optimal cyclic delay value, and transmitter performing the same

A method of a cyclic delay diversity with an optimal cyclic delay value, the method comprising:

• providing a transmission signal to a first antenna;
• acquiring a signal-to-noise/interference ratio (SINR) according to a diversity gain and a channel estimation error, and determining a cyclic delay value where the SINR is minimized;
• and
• providing the transmission signal to a second antenna after a delay period determined by the cyclic delay value.

An apparatus for determining an optimal cyclic delay value, the apparatus comprising:

• a Signal-to-Interference and Noise Ratio (SINR) function providing unit for providing an SINR function value according to a diversity order;
• a channel estimation error variance function providing unit for providing a channel estimation error variance function value;
• and
• a cyclic delay value determination unit for calculating an SINR value being required by a system according to the SINR function value and the channel estimation error variance function value to thereby determine the optimal cyclic delay value.