Patent ID: 9025684
Filing Date: 2015-05-05
Classification: H04L,H04W

Abstract:
1. A method of receiving an uplink demodulation reference signal (DM-RS), the method comprising: receiving a DM-RS orthogonal frequency division multiplexing (OFDM) symbol corresponding to a first cluster and a second cluster, wherein the first cluster and the second cluster are non-contiguously allocated in frequency; generating a DM-RS sequence having a length corresponding to a sum of numbers of sub-carriers of the first cluster and the second cluster; and extracting each DM-RS for each of the clusters included in the DM-RS OFDM symbol by using the DM-RS sequence, wherein the receiving an uplink demodulation reference signal is based on a clustered discrete Fourier transform (DFT)-spread OFDM reception, wherein when the length of the DM-RS sequence is equal to or greater than a length corresponding to three resource blocks (RBs), the DM-RS sequence is generated from an extended Zadoff-Chu (ZC) sequence, which is a constant amplitude zero autocorrelation (CAZAC) sequence, and when the length of the DM-RS is smaller than the length corresponding to the three RBs, the DM-RS sequence is generated using a computer-generated (CG)-CAZAC sequence.