Apparatus and method for transmitting uplink control information in OFDMA communication systems

A method for transmitting uplink control information using a channel quality information (CQI) channel in a communication system based on an orthogonal frequency division multiple access scheme, the method comprising the steps of:

• receiving data bits of the uplink control information;
• outputting preset codewords corresponding to the received data bits;
• outputting transmit symbols of sub-carriers by performing orthogonal modulation with respect to symbols for the codewords of the received data bits;
• and,
• inverse fast fourier transforming and transmitting a transmit signal including bundles of sub-carriers being allocated the modulated transmit symbols.

A method for receiving uplink control information in a communication system based on an orthogonal frequency division multiple access scheme, the method comprising the steps of:

• receiving signals including preset bundles of sub-carriers from a transmitter, the preset bundles of sub-carriers being allocated orthogonal-modulated symbols which are generated by orthogonal modulating symbols for codewords corresponding to data bits of the uplink control information in the transmitter;
• performing fast fourier transform with respect to the received signals;
• calculating squared absolute values of correlation values for possible patterns in a frequency domain with respect to the bundles of sub-carriers of the fast fourier transformed signals and performing orthogonal demodulation;
• calculating squared absolute values of correlation values for patterns corresponding to each codeword and then a sum of the absolute values for each codeword;
• and
• determining information data bits corresponding to a maximum codeword based on the calculated summation values.