Patent ID: 7889633

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 multiple antennas in the basic unit at intervals of 3 subcarriers in a frequency axis and at intervals of 5 OFDMA symbols in a time axis; 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 2 expressed as follows: PATTERN TABLE 2 s = 0 s = 1 s = 2 s = 3 s = 4 s = 5 SC = 0 P0 — — — — P1 SC = 1 — — — — — — SC = 2 — — — — — — SC = 3 P1 — — — — P0 where “P0” and “P1” indicate respective pilot REs for antenna ports 0 and 1, “—” indicates the data RE, “s” indicates an OFDMA symbol index, and “SC” indicates a subcarrier index.