Patent ID: 7307974

Claim:
A method for estimating a channel condition in a mobile communication system in which a transmitter includes a first transmission antenna and a second transmission antenna, the first and second transmission antennas transmitting signals through at least one odd subcarrier and at least one even subcarrier, respectively, the method comprising the steps of: (a) generating by the transmitter a first symbol and a second symbol to be used for an initial channel estimation of a receiver; (b) encoding by the transmitter the first symbol and the second symbol by a preset transmit diversity scheme for a preset period, and transmitting the encoded first and second symbols to the receiver through the at least one odd carrier and the at least one even carrier of each of the first and second transmission antennas; (c) receiving by the receiver a signal for the preset period, and calculating channel frequency responses of the at least one odd carrier of the first transmission antenna and channel frequency responses of the at least one even carrier of the second transmission antenna; and (d) estimating by the receiver channel frequency responses of the at least one even carrier of the first transmission antenna and channel frequency responses of the at least one odd carrier of the second transmission antenna by using the calculated channel frequency responses.