Patent ID: 8369378

Claim:
A method for transmitting Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system, the method comprising: spreading first ACK/NACK information using an orthogonal sequence with a spreading factor of 2; spreading second ACK/NACK information using an orthogonal sequence with the spreading factor of 2; and coding the first and second spread ACK/NACK information on four available neighboring subcarriers of multiple antennas in a form as shown in Table 1 or 2: TABLE 1 First set of four available neighboring subcarriers in an OFDM symbol antenna A a 1 a 2 b 1 b 2 antenna B −a 2 * a 1 * −b 2 * b 1 * antenna C 0 0 0 0 antenna D 0 0 0 0 TABLE 2 Second set of four available neighboring subcarriers in an OFDM symbol antenna A 0 0 0 0 antenna B 0 0 0 0 antenna C a 1 a 2 b 1 b 2 antenna D −a 2 * a 1 * −b 2 * b 1 * wherein antennas A and B represent two antennas in the multiple antennas, wherein antennas C and D represent two antennas in the multiple antennas, wherein a 1 to a 2 and b 1 to b 2 are respectively associated with elements of the first spread ACK/NACK information and the second spread ACK/NACK information, and wherein the “*” symbol represents a conjugate operation.