Electronics and Telecommunications Research Institute

Lg Chem, Ltd

Lg Display Co., Ltd.

Seoul National University

Industry-academic Cooperation Foundation, Chosun University

Min Soo Kang

Kwang Seon Kim

Woo Jin Byun

Bong Su Kim

Myung Sun Song

Bong-Su Kim

Se Hwan Son

Sang Young Jeon

Mi Kyung Suk

Hyeon Sik Choi

In Kui Cho

Je Hoon Yun

Jung Ick Moon

Seong Min Kim

Jae Soon Bae

Yong Heui Cho

Tae Jin Chung

Jong Geol Kim

Jong Seok Kim

Hyun Jee Yoo

Yoon Gyung Cho

Ji Eun Kim

Yeon Keun Lee

Jae C Lee

Jae Ick Choi

Jong Soo Lim

Yun Hye Hahm

Yeon Hwan Kim

Jung Bin Kim

Kong Kyeom Kim

Jun Gi Jang

Young Chul Lee

Byung Sun Jeon

Sang In Cho

Wook Dong Cho

Hyung Jung Kim

Kwang Jin Jeong

Kyoung Sik Moon

Jeoung Kwen Noh

Seong Su Jang

Young Seung Lee

Se Hawn Son

Woo Jin Byung

Hung Chul Park

Sun Soo Oh

Disclosed is a method and apparatus for generating a radar signal, in which performance of radar detection is ensured while increasing a spectrum efficiency in a radar network. The method comprises generating a set of frequency-modulation waveforms, generating an orthogonal code set, generating a set of coded frequency-modulation waveforms through element operation between the set of frequency-modulation waveforms and the orthogonal code set, calculating an objective function for the set of frequency-modulation waveforms with regard to a different set of coded frequency-modulation waveforms and previous sets of coded frequency-modulation waveforms, and selecting a current polyphase code set as an optimized polyphase code set when a result of current calculation is better or smaller than a result of previous iteration, and performing phase perturbation by replacing an element randomly selected in the current polyphase code set selected as the optimized polyphase code set with another admissible-phase element.

Method and apparatus for generating orthogonal radar signal based on frequency modulation

A transceiving apparatus may comprise a radiator emitting a beam; a receiver receiving a beam; a first sub-reflector which is provided to face the radiator and changes an orbital angular momentum (OAM) mode order of a beam; a second sub-reflector which is provided to face the receiver and changes an OAM mode order of a beam differently from the first sub-reflector; and a main reflector which is provided to face the first sub-reflector and the second sub-reflector.

Transceiver in wireless communication system

The present disclosure relates to a wireless communication apparatus capable of increasing throughput using MIMO in an LOS environment and a method for the same. A wireless communication apparatus based on the LOS-MIMO technique may comprise a multi-link configuration unit, a frequency response correction unit, a signal compensation unit, and a feedback unit. In the apparatus, an additional LOS-MIMO equalizer is used at the front of an LOS-MIMO estimator and a coding unit in order to compensate in-band frequency characteristics of frequency response characteristics estimated by the LOS-MIMO estimator and a signal channel estimator, whereby the LOS-MIMO estimation performance can be remarkably enhanced. Also, precise separation of multiplexed signals through the above-described LOS equalizer can make it possible to increase transmission capacity by using the LOS-MIMO which can be applied to high-order mode (e.g., over 16 quadrature amplitude modulation (QAM)) digital communications.

Wireless communication apparatus for increasing throughput using MIMO in LOS environment and method therefor

An apparatus for orbital angular momentum (OAM) mode combination and an antenna apparatus for multi-mode generation are provided. The apparatus for OAM mode combination includes three input ports configured to receive independent OAM mode signals, four output ports configured to output OAM mode signals with the same or different phase delays; and a circuit element configured to simultaneously combine or distribute the OAM mode signals by controlling phases of output signals output through the four output ports to be different depending on the OAM mode signals received through the input ports.

Apparatus for OAM mode combination and antenna apparatus for multi-mode generation

Disclosed is a circular array antenna. The circular array antenna includes: an input/output unit receiving electromagnetic waves from a transmitter and distributing the received electromagnetic waves to the antenna; a primary feeder connected with the input/output unit and placed at the center of the circular array antenna; a plurality of secondary feeders radially connected to the primary feeder; a plurality of patch units connected to the respective secondary feeders to generate an electric field radially; and a plurality of length controllers formed at terminals of the respective secondary feeders in a direction to extend the lengths of the respective secondary feeders, of which the lengths are controllable.

Circular array antenna

Provided are a multi-input multi-output system which overcomes a disadvantage that optimal receiving performance cannot be maintained according to an installation environment and a performance change of a receiver when a receiving module is configured by using a fixed attenuator and a fixed phase in a line-of-sight multi-input multi-output system configuration and analogously controls an interference removing module of a receiver including a variable attenuator and a phase shifter which are controllable to enhance a receiving performance and increase frequency efficiency, in order to maximize a signal-to-interference ratio of each path and an operating method thereof.

Method for enhancing performance of multi-input multi-output system on line-of-sight

The present invention provides an array antenna apparatus for a rotation mode, a wireless communication terminal, and a method thereof. The apparatus according to the exemplary embodiment includes an antenna array including a plurality of antenna elements; and a control unit which determines an antenna pattern in accordance with a transmission/reception characteristic of a signal and assigns a weight to antenna elements in a position corresponding to the determined antenna pattern on the antenna array to implement a rotation mode antenna based on the antenna element to which the weight is assigned.

Array antenna apparatus for rotation mode, and wireless communication terminal and method

The present invention relates to a reception apparatus. The reception apparatus includes a plurality of reception antennas; and a signal processing unit configured to use reception characteristic of the plurality of reception antennas, wherein the signal processing unit comprises a channel estimation unit configured to respectively estimate a channel response matrix of each signal received via the plurality of reception antennas, and a coding unit configured to define a coding matrix based on an inverse matrix of the estimated channel response matrix, and to obtain a final output signal corresponding to each reception antenna by applying the coding matrix to each received signal.

Reception apparatus of multi input multi output system and reception signal processing method

A method for use with a reflectarray antenna for wireless telecommunication is described. The method involves providing a reflectarray antenna, and adjusting a phase of a scattered field of the reflectarray antenna for generating different radiation patterns for angular mode-based multiplexing. The reflectarray antenna includes a ground plane, a dielectric substrate attached on the ground plane; and a first antenna patch formed on one side of the dielectric substrate. Further, the reflectarray antenna includes a second antenna patch formed adjacent to the first antenna patch with a separation area therebetween; and a phase adjustment member disposed in the separation area. The phase of the scattered field of the antenna is adjusted by changing a DC voltage of the phase adjustment member.

Method for use with a reflectarray antenna for wireless telecommunication

Provided is an apparatus for calibrating a transmission path, the apparatus including one or more couplers to separate, by one or more paths, one or more input signals input from an input terminal of one or more antennas, a power detector to detect amplitude of one or more path signals separated by the one or more paths, a power distributor to distribute any one of the one or more path signals, one or more mixers to mix a distribution signal distributed by the power distributor with the one or more path signals, a low-pass filter to remove a high-frequency component of a mixed signal mixed by the one or more mixers; and a voltage detector to detect amplitude of one or more filter pass signals with the high-frequency component removed.

Apparatus and method for calibrating transmission path

The present invention relates to a substrate for an organic electronic element that enables surface resistance to be reduced and light-extraction efficiency improved, the substrate including: a base substrate; a scattering layer which is formed on the base substrate and includes an conductive pattern for reducing the surface resistance of an electrode, scattering particles for scattering light and a binder, and which forms an uneven structure in the surface opposite the base substrate; and a planarizing layer which is formed on the scattering layer and flattens the surface undulations caused by the uneven structure of the scattering layer, wherein the refractive index (Na) of the scattering particles and the refractive index (Nb) of the planarizing layer satisfy the relationship in formula 1 below. [Formula 1] |Na&#x2014;Nb|&#x2267;0.3. In the formula as used herein, Na signifies the refractive index of the scattering particles and Nb signifies the refractive index of the planarizing layer.

Substrate for an organic electronic element and a production method therefor

A method for wirelessly receiving energy and data, including: a resonation operation of resonating a first frequency power signal transmitted from a transmission apparatus; a reception operation of receiving a second frequency data signal transmitted from the transmission apparatus; a first matching operation of matching input/output impedance upon receiving the first frequency power signal; a rectification operation of rectifying impedance-matched power signal from the first matching operation into a DC current; a second matching operation of matching input/output impedance upon receiving the second frequency data signal; an oscillation operation of outputting a second frequency signal by using the first frequency signal output from the resonation operation, as a reference frequency; and a frequency mixing operation of mixing the impedance-matched data signal from the second matching operation with the signal output from the oscillation operation to restore a baseband data signal.

Apparatus and method for wirelessly transmitting and receiving energy and data

Disclosed are a method for inter-beam interference reduction using cross polarization and a method for transmitting/receiving a signal. A transmitting method of a base station in a wireless communication system, includes: configuring a first parameter for forming a first beam having first polarization with respect to a terminal located in a first sub-sector, and configuring a second parameter for forming a second beam having second polarization with respect to a terminal located in a second sub-sector; and transmitting a signal to each terminal by forming the first beam using at least one antenna based on the configured first parameter and forming the second beam using the at least one antenna based on the configured second parameter, wherein a frequency band equal to a frequency band of the first sub-sector is allocated to the second sub-sector in a cell in the base station.

Method for inter-beam interference reduction using cross polarization and method for transmitting/receiving signal

Disclosed are a wireless communication method of improving frequency efficiency based on a channel function in a wireless communication system and an apparatus thereof. The wireless communication system using a digital modulation scheme, includes: a transmitting apparatus which modulates a data signal to generate a modulation symbol, generates a channel symbol function corresponding to the modulation symbol, combines the modulation symbol with the channel symbol function to generate a transmission symbol to transmit the generated transmission symbol through a transmission antenna; and a receiving apparatus which receives the transmission symbol through a reception antenna, estimates a channel symbol function included in the transmission symbol, and extracts the data signal based on the modulation symbol included in the transmission symbol.

Wireless communication method and apparatus based on channel function

Disclosed are an apparatus, method, and system for transmitting and receiving high-speed data in point-to-point (P2P) fixed wireless communication. In an apparatus for transmitting high-speed data in P2P fixed wireless communication, an amplitude zero autocorrelation waveform (CAZAC) sequence generator generates and outputs a CAZAC sequence. A frame generator generates a frame in which the CAZAC sequence is arranged as part of a preamble before a payload including actual data. A continuous wave (CW) generator generates and outputs a CW signal. A multiplexer receives the CW signal output by the CW generator, and arranges and outputs the CW signal in a position before a signal output by the frame generator.

Apparatus, method, and system for transmitting and receiving high-speed data in point-to-point fixed wireless communication

Growing community of inventors

Daejeon, South Korea

Min Soo Kang