A pilot allocation method for allocating pilots corresponding to a plurality of layers to an uplink frame including a first and a second successive tile in a two-dimensional symbol-subcarrier structure having a time axis and a frequency axis, wherein the first and second tiles are positioned in succession along the time axis, the first and the second successive tile each having a low-time/low-frequency corner, a low-time/high-frequency corner, a high-time/low-frequency corner and a high-time/high-frequency corner, the pilot allocation method comprising: allocating a first subcarrier in a first to fourth layer of the two-dimensional symbol-subcarrier structure to transmit a first pilot, the first pilot being located at a first symbol-subcarrier position along the frequency axis and along the time axis; and allocating a second subcarrier in the first to fourth layer of the two-dimensional symbol-subcarrier structure to transmit a second pilot, the second pilot being located at a second symbol-subcarrier position along the frequency axis and along the time axis, wherein the first symbol-subcarrier position of the first layer is located in the low-time/low-frequency corner of the first tile, and the second symbol-subcarrier position of the first layer is located next to the high-time/high-frequency corner of the second tile and in the high-frequency subcarrier of the second tile, and wherein the first symbol-subcarrier position of the second layer is located next to the low-time/low-frequency corner of the first tile and in the low-frequency subcarrier, and the second symbol-subcarrier position of the second layer is located in the high-time/high-frequency corner of the second tile, and wherein the first symbol-subcarrier position of the third layer is located in the low-time/high-frequency corner of the first tile, and the second symbol-subcarrier position of the third layer is located next to the high-time/low-frequency corner of the second tile and in the low-frequency subcarrier of the second tile, and wherein the first symbol-subcarrier position of the fourth layer is located next to the low-time/high-frequency corner of the first tile and in the high-frequency subcarrier, and the second symbol-subcarrier position of the fourth layer is located in the high-time/low-frequency corner of the second tile. allocating a first subcarrier in a first to fourth layer of the two-dimensional symbol-subcarrier structure to transmit a first pilot, the first pilot being located at a first symbol-subcarrier position along the frequency axis and along the time axis; and allocating a second subcarrier in the first to fourth layer of the two-dimensional symbol-subcarrier structure to transmit a second pilot, the second pilot being located at a second symbol-subcarrier position along the frequency axis and along the time axis, wherein the first symbol-subcarrier position of the first layer is located in the low-time/low-frequency corner of the first tile, and the second symbol-subcarrier position of the first layer is located next to the high-time/high-frequency corner of the second tile and in the high-frequency subcarrier of the second tile, and wherein the first symbol-subcarrier position of the second layer is located next to the low-time/low-frequency corner of the first tile and in the low-frequency subcarrier, and the second symbol-subcarrier position of the second layer is located in the high-time/high-frequency corner of the second tile, and wherein the first symbol-subcarrier position of the third layer is located in the low-time/high-frequency corner of the first tile, and the second symbol-subcarrier position of the third layer is located next to the high-time/low-frequency corner of the second tile and in the low-frequency subcarrier of the second tile, and wherein the first symbol-subcarrier position of the fourth layer is located next to the low-time/high-frequency corner of the first tile and in the high-frequency subcarrier, and the second symbol-subcarrier position of the fourth layer is located in the high-time/low-frequency corner of the second tile.