Patent ID: 7796695

Claim:
A method for allocating pilots and data to an uplink channel in an OFDMA (orthogonal frequency division multiple access) system, comprising: i) partitioning subcarrier groups and symbols from the uplink channels based on a basic pilot pattern generated by a specific reference, and allocating at least one subchannel based on the partitioned subcarrier groups and the symbols; ii) hopping the subcarrier groups according to a hopping pattern, and allocating data, the subcarrier groups being caused by the subchannel to allocated in step i); and iii) differently allocating the pilot per subcarrier group based on the basic pilot pattern from the data hopped in step ii), wherein the hopping pattern is generated using an RS code with a same length as that of the subchannel, the RS code being allocated to a corresponding base station based on a number of the subcarrier groups, a basic RS code, a group number, and a cell number.