METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION REFERENCE SIGNAL AND HYBRID SPATIAL MUTIPLEXING AND SPACE DIVISION MULTIPLE ACCESS FOR WIRELESS COMMUNICATION SYSTEM USING PLANAR ANTENNA ARRAY

摘要

The present invention relates to a wireless communication system, and more specifically, to a data exchange apparatus which can effectively transmit a channel state information reference signal (CSI-RS) for two-dimensional downlink space channel estimation by only using a limited amounted of downlink frequency resources in a frequency division duplex (FDD) massive MIMO system using a two-dimensional plane alignment antenna and a method thereof.