Patent ID: 8493836
Filing Date: 2013-07-23
Classification: H04L

Abstract:
1. A method for controlling a user equipment (UE) to transmit a Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol via multiple antennas, the method comprising: mapping codewords to three layers, wherein the layers indicate virtual spatial resources; performing Discrete Fourier Transform (DFT) spreading upon each of the three layers; generating precoded signals by precoding the three layers using a specific precoding matrix selected from a prestored codebook; performing a predetermined process for constructing the SC-FDMA symbol upon the precoded signals; and transmitting the SC-FDMA symbol to a base station (BS) via the multiple antennas, wherein the prestored codebook consists of 20 precoding matrices selected from 12 precoding matrix groups  to each of which a predetermined constant is multiplied, wherein X is a variable having an amplitude of 1.