Apparatus and method for transitting channel quality indicator and acknowledgement signals in SC-FDMA communication systems

An apparatus for transmitting one or more positive or negative acknowledgement (ACK/NACK) bits in response to data reception in a single-carrier frequency division multiple access (SC-FDMA) communication system, the apparatus comprising:

• a controller configured to:
• if the one or more ACK/NACK bits consists of one bit,
• apply a first code to a first symbol, if the acknowledgement bit indicates NACK, and
• apply a second code to the first symbol, if the acknowledgement bit indicates ACK,
• if the one or more ACK/NACK bits consists of two bits representing two acknowledgements, apply quadrature phase shift keying (QPSK) modulation to the first symbol based on a value of the two ACK/NACK bits, and
• if no ACK/NACK bit exists, apply the first code to the first symbol;
• and
• a transmitter configured to transmit the first symbol and a second symbol in a slot.

A method for receiving one or more positive or negative acknowledgement (ACK/NACK) bits in response to data reception in a single-carrier frequency division multiple access (SC-FDMA) communication system, the method comprising:

• receiving a first symbol and a second symbol in a slot;
• and
• identifying a channel quality indicator (CQI) and one or more ACK/NACK bits based on the first symbol and second symbol,
• wherein if the one or more ACK/NACK bits consists of one bit,
• the acknowledgement bit is identified as NACK, if a first code is applied to the first symbol, and
• the acknowledgement bit is identified as ACK, if a second code is applied to the first symbol,
• wherein if the one or more ACK/NACK bits consists of two bits representing two acknowledgements, a quadrature phase shift keying (QPSK) modulation is applied to the first symbol based on a value of the two ACK/NACK bits, and
• wherein if no ACK/NACK bit exists, the first code is applied to the first symbol.

An apparatus for receiving one or more positive or negative acknowledgement (ACK/NACK) bits in response to data reception in a single-carrier frequency division multiple access (SC-FDMA) communication system, the apparatus comprising:

• a receiver configured to receive a first symbol and a second symbol in a slot;
• and
• a controller configured to identify a channel quality indicator (CQI) and one or more ACK/NACK bits based on the first symbol and second symbol,
• wherein if the one or more ACK/NACK bits consists of one bit,
• the acknowledgement bit is identified as NACK if a first code is applied to the first symbol, and
• the acknowledgement bit is identified as ACK if a second code is applied to the first symbol,
• wherein if the one or more ACK/NACK bits consists of two bits representing two acknowledgements, a quadrature phase shift keying (QPSK) modulation is applied to the first symbol based on a value of the two ACK/NACK bits, and
• wherein if no ACK/NACK bit exists, the first code is applied to the first symbol.