Patent ID: 8040789

Claim:
A method of transmitting a basic unit in uplink by a mobile station (MS) in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system, the method comprising: forming the basic unit which size is 4 subcarriers by 6 OFDMA symbols, the basic unit containing a plurality of pilot and data resource elements (REs); configuring the pilot REs for a single stream in the basic unit; and transmitting the basic unit in uplink, wherein the RE is a time-frequency resource defined by one OFDMA symbol and one subcarrier, wherein the pilot and data REs are configured in the basic unit as in Pattern Table 1 expressed as follows: [Pattern Table 1] Basic unit 6 OFDMA symbols 4 subcarriers P — — — P — — — — — — — — — — — — — — P — — — P where “P” indicates the pilot RE for the single stream, and “-” indicates the data RE.