Code division multiplexing in a single-carrier frequency division multiple access system

A method of wireless communication, comprising:

• generating a modulation symbol for control information;
• spreading the modulation symbol for the control information with a spreading code by replicating the modulation symbol L times and multiplying the replicated modulation symbols with L chips of the spreading code to obtain L spread modulation symbols, where L is a length of the spreading code;
• and
• generating at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols and a set of contiguous subcarriers used for transmission.

An apparatus for wireless communication, comprising:

• means for generating a modulation symbol for control information;
• means for spreading the modulation symbol for the control information with a spreading code by replicating the modulation symbol L times and multiplying the replicated modulation symbols with L chips of the spreading code to obtain L spread modulation symbols, where L is a length of the spreading code;
• and
• means for generating at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols and a set of contiguous subcarriers used for transmission.

A method of wireless communication, comprising:

• receiving at least one single-carrier frequency division multiple access (SC-FDMA) symbol comprising control information;
• performing SC-FDMA demodulation on the at least one received SC-FDMA symbol to obtain received symbols from a set of contiguous subcarriers used for transmission in at least one symbol period;
• and
• despreading the received symbols with L chips of a spreading code to recover a modulation symbol for the control information, where L is a length of the spreading code.

An apparatus for wireless communication, comprising:

• means for receiving at least one single-carrier frequency division multiple access (SC-FDMA) symbol comprising control information;
• means for performing SC-FDMA demodulation on the at least one received SC-FDMA symbol to obtain received symbols from a set of contiguous subcarriers used for transmission in at least one symbol period;
• and
• means for despreading the received symbols with L chips of a spreading code to recover a modulation symbol for the control information, where L is a length of the spreading code.