Patent ID: 8103929

Claim:
A method for transmitting an ACKnowledgement/NonACKnowledgement (ACK/NACK) in a transmitter of an Orthogonal Frequency Division Multiplexing (OFDM) mobile communication system supporting data transmission through multiple layers, the method comprising the steps of: determining, by the transmitter, whether transmission of an ACK/NACK is transmission for a first layer or transmission for layers higher than the first layer; when the transmission of the ACK/NACK is transmission for the first layer, transmitting, by the transmitter, the ACK/NACK by using partial Discrete Fourier Transform (DFT) input indexes of N-point DFT or a partial code of an available orthogonal code; and when the transmission of the ACK/NACK is transmission for layers higher than the first layer, transmitting, by the transmitter, the ACK/NACK by using all DFT input indexes of N-point DFT or all available orthogonal codes, wherein the ACK/NACK is transmitted by mapping allocated resources for transmission of the ACK/NACK.