Method and apparatus for transmitting and receiving an uplink acknowledgement channel for a downlink data channel in a mobile communication system using orthogonal frequency division multiple access

A method of receiving an uplink ACKnowledge CHannel (ACKCH) for a downlink data channel from a transmission apparatus in a mobile communication system using Orthogonal Frequency-Division Multiple Access (OFDMA), the method comprising:

• transmitting a downlink control channel including at least two Control Channel Elements (CCEs);
• selecting a number of reception antennas corresponding to a number of the at least two CCEs and assigning the selected number of reception antennas to channel resources in such a manner that the reception antennas correspond to the channel resources by the at least two CCEs, respectively, when the number of the at least two CCEs is equal to or less than a number of transmission antennas of the transmission apparatus;
• and
• receiving the uplink ACKCH through the reception antennas.

An apparatus for transmitting an uplink ACKnowledge CHannel (ACKCH) for a downlink data channel in a mobile communication system using Orthogonal Frequency-Division Multiple Access (OFDMA), the apparatus comprising:

• a transmission module for determining channel resources for each Control Channel Element (CCE) and generating uplink acknowledgement information by analyzing a received downlink data channel, when a downlink control channel including at least two CCEs is received;
• a plurality of transmission antennas for transmitting the uplink acknowledgement information;
• and
• a controller for assigning the at least two CCEs to at least two of the plurality of transmission antennas, respectively, and transmitting the uplink ACKCH including the uplink acknowledgement information through the at least two of the plurality of transmission antennas.