Samsung Electronics Co., Ltd.

Yonsei University

University of Texas System

Sei-Joon Shim

Chung-Yong Lee

Kyeong-Yeon Kim

Yung-Soo Kim

Jong-Hyung Kwun

Sang-Boh Yun

Robert Wendell Heath, Jr

Chan-Byoung Chae

Myeon-Kyun Cho

Seung-Hoon Nam

Jong-Hyeuk Lee

Eun-Jung Kim

Eung-sun Kim

In-Soo Hwang

Jae-Kon Lee

Jae-Sang Ham

A method and an apparatus are provided for eliminating multi-user interference in a multi-antenna system. In a BS, precoding vector information of at least one interfering user terminal interfering with a user terminal and information about a ratio of the transmission (TX) power of the user terminal to the total TX power of the BS are detected. A control signal including the detected information is transmitted to the user terminal.

Method and apparatus for eliminating multi-user interference in multi-antenna system

A precoder and a precoding method in a multiuser multi-antenna system are provided. The precoder includes a channel checker for determining a DownLink (DL) channel condition of terminals in a service coverage area, a pre-compensator for pre-compensating, for channel distortion, signals to be sent to the terminals when a nonlinear algorithm is selected based on the channel condition of the terminals, and an interference remover for canceling interference in a channel by multiplying the pre-compensated signals by inverse channels of the terminals, and for canceling interference between the terminals. Accordingly, the pre-equalization can be carried out without global channel state information, and an increase of the transmit power can be prevented in the permutation.

Precoder and precoding method in a multi-antenna system

Provided are an apparatus and method for eliminating multi-user interference in a codebook-based beamforming system. A transmitter for providing a service to multi-users in the codebook-based beamforming system includes a beamformer for generating beamformed user signals by multiplying transmit data of users, to whom the service is to be provided, by corresponding weighting factor vectors using feedback information; a null space generator for generating a null space matrix orthogonal to weighting factor vectors of other users; and a projector for projecting the beamformed user signals on the corresponding null space matrix and transmitting the resulting signals through a plurality of antennas. Because the multi-user signals can maintain orthogonality, the performance degradation caused by the multi-user interference can be prevented.

Apparatus and method for eliminating multi-user interference

A user allocating apparatus and method in a multiple antenna mobile communication system supporting multi-user diversity is provided. Each user calculates effective Signal-to-Interference Noise Ratios (SINRs) and bit loading over every possible detection order and selects a detection order maximizing the number of channels with a minimum product of the minimum symbol distance of a modulation scheme and an effective SINR, thereby minimizing an average error probability. A base station receives detection orders from users and selects a user with a maximum detection order value. The base station then transmits data to the selected user using modulation schemes determined by the user for the transmit antennas.

Apparatus and method for allocating user in a multiple antenna mobile communication system supporting multi-user diversity

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Seoul, South Korea

Sei-Joon Shim