公开(公告)号：US20240154686A1

公开(公告)日：2024-05-09

申请号：US18453525

申请日：2023-08-22

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Junil CHOI ,  Hyesang CHO ,  Beomsoo KO

IPC: H04B7/155

CPC classification number: H04B7/15514 ,  H04B7/15592

Abstract: Disclosed is a coverage extension method and apparatus in a terahertz (THz) region using cooperative communication. A coverage extension method in a THz region using cooperative communication performed by a computer device includes setting, by an access point (AP) in a downlink system that supports a plurality of user equipments (UEs), a UE that requires assistance due to a blocked line-of-sight (LoS) link as a destination UE and setting a remaining UE as a medium UE among the plurality of UEs; transmitting, by the AP, data to the medium UE; and cooperatively transmitting, by the medium UE, data to the destination UE.

公开(公告)号：US20230336224A1

公开(公告)日：2023-10-19

申请号：US18141812

申请日：2023-05-01

Applicant: SAMSUNG ELECTRONICS CO., LTD. ,  KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yongyun CHOI ,  Chulhee JANG ,  Junil CHOI ,  Sucheol KIM ,  Hyeongtaek LEE ,  Hwanjin KIM

IPC: H04B7/06 ,  H04B7/0456 ,  H04B7/0426

CPC classification number: H04B7/0617 ,  H04B7/0639 ,  H04B7/0456 ,  H04B7/0426

Abstract: A method performed by a base station in a wireless communication system, includes: determining, from among a plurality of antennas of the base station, a first antenna that meets a power threshold, based on a first beamformer scaled according to a power limit; generating a second beamformer corresponding to the first antenna; applying an overlap coefficient matrix to the second beamformer; generating a third beamformer by combining the second beamformer to which the overlap coefficient matrix has been applied and the first beamformer; and transmitting a signal using the third beamformer.

公开(公告)号：US20220224388A1

公开(公告)日：2022-07-14

申请号：US17703379

申请日：2022-03-24

Applicant: Samsung Electronics Co., Ltd. ,  KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yongyun CHOI ,  Chulhee JANG ,  Hyeongtaek LEE ,  Junil CHOI ,  Hwanjin KIM

IPC: H04B7/06 ,  H04L5/00 ,  H04W72/04 ,  H04W72/08 ,  H04B7/08

Abstract: The disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data rate after a 4th generation (4G) communication systems such as long term evolution (LTE). The disclosure is for reconstructing a downlink channel in a wireless communication system. An operation method for a base station is provided. The operation method includes the steps of transmitting downlink reference signals (RSs) to a terminal, receiving an indication of a first channel matrix estimated by the terminal and at least one uplink RS; estimating a second channel matrix on the basis of the at least one uplink RS, and on the basis of the first channel matrix and the second channel matrix, reconstructing channel information to be used for data transmission.

公开(公告)号：US20210160007A1

公开(公告)日：2021-05-27

申请号：US16878826

申请日：2020-05-20

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Wan CHOI ,  Jinkyu LEE ,  Junil CHOI

IPC: H04L1/00 ,  H04L27/18 ,  H04L27/26

Abstract: A method and apparatus for optimizing average bit error probability via a deep multi-armed bandit in an orthogonal-frequency division multiplexing and index modulation system for low power communication are proposed. The method proposed in the present invention comprises: detecting BPSK symbols and subcarriers among all subcarriers; defining a combination of selected subcarriers as a subcarrier selection pattern; selecting the subcarrier selection pattern through learning to minimize the average bit error probability for all combinations of selected subcarriers; and updating a learning parameter of the subcarrier selection pattern selected through learning.

公开(公告)号：US20230198810A1

公开(公告)日：2023-06-22

申请号：US17919425

申请日：2021-04-16

Applicant: Samsung Electronics Co., Ltd. ,  KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yongyun CHOI ,  Hwanjin KIM ,  Chulhee JANG ,  Junil CHOI

IPC: H04L25/02 ,  H04W64/00

CPC classification number: H04L25/0204 ,  H04L25/0222 ,  H04W64/006

Abstract: Disclosed is a method for estimating a channel of a terminal by a base station in a wireless communication system supporting multiple antennas, the method comprising the steps of: estimating a moving speed of the terminal on the basis of a first channel value acquired at a current time point and a second channel value acquired at a previous time point; determining, on the basis of the estimated moving speed, a complexity degree corresponding to the number of channel values for multiple time points including the current time point; and estimating a channel of the terminal at a next time point on the basis of the determined complexity degree.