Patent ID: 8023551

Claim:
A wireless transmit/receive unit (WTRU) configured to perform orthogonal frequency division multiple access (OFDMA) communications comprising: a receiver configured to receive OFDMA symbols in a symbol time interval, where the OFDMA symbols include multi-user input data spread using orthogonal sequences on a first group of subcarriers and input data not spread using orthogonal sequences on a second group of subcarriers; wherein the multi-user input data is for a plurality of users and is spread using a plurality of orthogonal sequences; wherein each of the plurality of orthogonal sequences is associated with a respective user of the plurality of users; and the receiver configured to recover single-user input data from the first group of subcarriers and the input data from the second group of subcarriers, wherein the single-user input data is recovered from the first group of subcarriers by despreading the multi-user input data.