Patent ID: 8406185

Claim:
A method of downlink transmitting a resource unit by a base station in a wireless communication system, the method comprising: forming the resource unit including a plurality of pilot resource elements (REs) and a plurality of data resource elements; allocating a plurality of pilot pairs to have a prescribed subcarrier interval and a prescribed OFDM (orthogonal frequency division multiplexing) symbol interval within the resource unit; and transmitting the resource unit to a user equipment via multi-antenna, wherein each of the plurality of pilot pairs includes individual pilots for two different streams or antennas, wherein locations of the plurality of pilot pairs within the resource unit are represented as a following pattern table: [Pattern table] os = 0 os = 1 os = 2 os = 3 os = 4 os = 5 sp = 0 PP * * PP * * sp = 1 * * * * * * sp = 2 * PP * * PP * sp = 3 * * * * * * sp = 4 * * PP * * PP sp = 5 * * * * * * sp = 6 PP * * PP * * sp = 7 * * * * * * sp = 8 * PP * * PP * where the sp indicates a subcarrier pair index, the os indicates an OFDM symbol index, the PP indicates the pilot pair including the individual pilots for the two different streams or antennas, and the * indicates an allocated location of data, wherein locations of the individual pilots within the PP can be independently switched to each other, and wherein the PP can be cyclically shifted along a time or frequency axis.