Patent ID: 8718168

Claim:
A multi-layer transmission method of multiplexing and transmitting data and a demodulation reference signal (DM-RS) sequence in an uplink digital Fourier transform-spread orthogonal frequency division multiplexing (DFT-S-OFDM) transmission employing multiple input multiple-output (MIMO), the method comprising: allocating a first DM-RS sequence as a DM-RS sequence of a first transmission layer; allocating a second DM-RS sequence as a DM-RS sequence of a second transmission layer; generating a first layer OFDM symbol in which the first DM-RS sequence and data of the first transmission layer are multiplexed; generating a second layer OFDM symbol in which the second DM-RS sequence and data of the second transmission layer are multiplexed; including at least two OFDM symbols in which a layer-specific data and a layer-specific DM-RS sequences are multiplexed in each slot and transmitting the slot, wherein the at least two OFDM symbols in which the layer-specific data and the layer-specific DM-RS sequences are multiplexed are a second OFDM symbol and a sixth OFDM symbol of the slot; and transmitting the first layer OFDM symbol by using the first transmission layer and the second layer OFDM symbol by using the second transmission layer to a base-station, wherein the first DM-RS sequence has the same sequence as the second DM-RS sequence, and a cyclic shift (CS) value of the first DM-RS sequence is configured to differ from a CS value of the second DM-RS sequence.