Samsung Electronics Co., Ltd.

Yonsei University

Jong Kwan Yook

Sung Tae Kim

Ju Ho Lee

Jin Kyu Han

Youn Sun Kim

In Ho Lee

Cheol Mun

Feedback methods and apparatuses are provided for efficiently feeding back downlink Channel State Information (CSI) using limited information in a DAS-based wireless communication system. A method includes determining, by a receiver, a candidate Antenna Port (AP) set from among a plurality of APs; selecting an active AP set from the candidate AP set; and transmitting the candidate AP set, the active AP set, and the downlink CSI of active APs included in the active AP set.

Method and apparatus for feedback of channel state information in a distributed antenna system (DAS)&#x2014; based wireless communication system

A transmission method and apparatus utilizing Multiple-Input and Multiple-Output (MIMO) precoding based on Distributed Antenna Systems (DASs) are provided. The transmission method includes determining active antenna ports, for a User Equipment (UE) having multiple receive antennas, from among a plurality of Distributed Antenna Ports (DAPs) evenly placed in a service area; assigning a Multiple-Input and Multiple-Output (MIMO) mode to the UE and notifying the UE of the MIMO mode assignment; determining a signal precoding vector on a basis of feedback information for the MIMO mode received from the UE; and precoding a signal using the signal precoding vector and transmitting the precoded signal through the active antenna ports.

Method and apparatus for downlink transmission based on MIMO precoding in wireless communication system employing distributed antenna systems

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Seoul, South Korea

Jong Kwan Yook