Electronics and Telecommunications Research Institute

Jun Young Nam

Jae Young Ahn

Young Jo Ko

Hyun Kyu Chung

Seong Rag Kim

The present invention relates to a multi-input and multi-output communication method in a large-scale antenna system. An MIMO transmission method according to the present invention includes: obtaining statistical channel information on at least one terminal, dividing terminals into a plurality of classes and a plurality of groups based on the statistical channel information, wherein the groups depend on the classes; determining a group beam-forming matrix for each of the divided groups; performing a group beamforming transmission by group based on the group beam-forming matrix to obtain instantaneous channel information; and scheduling terminals based on the instantaneous channel information. Thus, it is possible to decrease the complexity in a scheduling and precoding calculation without an increase in the amount of wireless resources that are required for providing feedback for a reference signal and channel status information.

Multi-input and multi-output communication method in large-scale antenna system

Disclosed is a method for multi-input multi-output transmission of a base station in a wireless communication system. The method includes obtaining channel information of one or more terminals, classifying the one or more terminals into one or more classes and one or more groups dependent on the class based on the channel information, determining a group beamforming matrix for each of the one or more groups, performing group beamforming transmission on terminals belonging to each of the one or more groups based on the group beamforming matrix, obtaining single user-channel quality indicator (SU-CQI) information and interference signal information of each of the terminals belonging to each of the one or more groups, and scheduling the terminals based on the SU-CQI information and the interference signal information.

Method for multi-input multi-output communication in large-scale antenna system

Disclosed are a cooperation communication method and system using feedback signals. The cooperation communication method includes transmitting a packet to a base station by a terminal, determining, by the terminal, whether decoding of the transmitted packet is successfully performed using a feedback signal from the base station, and re-transmitting the packet to the base station by the terminal according to whether decoding of a packet of an adjacent terminal within a prescribed distance from the terminal is successfully performed.

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Daejeon, South Korea

Jun Young Nam