Patent ID: 8964623
Filing Date: 2015-02-24
Classification: H04L

Abstract:
1. A method for a base station transmitting a reference signal to a user equipment using 8 layers or less, the method comprising: transmitting data of the 8 layers or less through a data region of a downlink subframe that comprises 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols; and transmitting Dedicated Reference Signals (DRSs) of the 8 layers or less in a specific OFDM symbol of the downlink subframe, wherein the DRSs of the 8 layers or less are divided into first and second groups, wherein the DRSs of the first and second groups are multiplexed according to a Code Division Multiplexing (CDM) scheme at each resource element, wherein the DRSs of the first and second groups are arranged at intervals of M subcarriers in a 10 wherein M is an integer equal to or greater than 4.