Pohang University of Science and Technology Foundation

Samsung Electronics Co., Ltd.

Lg Electronics Inc.

Joonho Cho

Byounghoon Kim

Kijun Kim

Yeohun Yun

Jeonghoon Choi

Jeongho Yeo

Byungwook Han

Dae Won Lee

Jonghwan Kim

Chanhong Kim

Hayoung Yang

Eunae Lee

Seijoon Shim

Kyeongyeon Kim

Jubum Kim

Taejun Jang

Younggeon Yoo

The disclosure relates to a communication technique and a system for converging a fifth generation (5G) and subsequent communication system with Internet of things (IoT) technology to support a higher data transmission rate than a fourth generation (4G) system. The disclosure is applied to the intelligent service based on the 5G and subsequent communication technology and IoT-related technology. The reception device according to the disclosure receives orthogonal frequency division multiplexing (OFDM) signals through a plurality of antennas, aligns the received OFDM signals, converts at least one of the aligned reception signals into a designated symbol, estimates the data symbols of the reception signals based on the designated condition, and determines the data symbol of the reception signals by synthesizing at least one of the converted reception signals among the estimated reception signals.

Device for linear reception processing of low-complexity light of multi-antenna wireless communication system, and operating method therefor

Provided are a discrete Fourier transform (DFT)-spread orthogonal frequency division multiplexing (OFDM) transmitter and transmission method, and a DFT-spread OFDM receiver and reception method which may receive signals transmitted thereby, in which a constellation rotation angle and a frequency domain spectrum shaping vector are designed such that a PAPR may be easily traded off with frequency efficiency even without inter-symbol interference. The DFT-spread OFDM transmitter includes a constellation rotation unit constellation-rotating a symbol vector including M pulse amplitude modulation (PAM) symbols by a constellation rotation angle to generate a constellation-rotated symbol vector, a pruned DFT-spread unit spreading the constellation-rotated symbol vector by using a pruned DFT matrix to generate a pruned DFT-spread vector, a frequency domain spectrum shaping unit performing a Hadamard product on the pruned DFT-spread vector with a shaping vector to generate a frequency domain spectrum shaped vector, and a subcarrier allocation unit allocating the frequency domain spectrum shaped vector to a subcarrier in an allocated frequency range.

Transmitter using symbol constellation rotation and spectrum shaping, transmission method thereof, receiver and reception method thereof in communication system

A base station for transmitting and receiving signals in a wireless communication system is provided. The base station includes a transceiver, and at least one processor configured to obtain reception antenna weights for the base station including an array of a plurality of antennas, and transmission antenna weights for at least one user equipment (UE), convert signals received from the at least one UE through a plurality of reception paths, into beam-domain signals, based on the transmission antenna weights and the reception antenna weights, combine the converted beam-domain signals by applying predefined combining weights to the converted beam-domain signals, and obtain data from the combined signals.

Method and apparatus for combining plurality of radio frequency signals

The present disclosure relates to a pre-5-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4-Generation (4G) communication system such as Long Term Evolution (LTE). A method for operating a transmission device in a wireless communication system is provided. The method includes generating modulation symbols based on a modulation scheme, generating transformed data by applying a modified Fourier transform to the modulation symbols, generating a transmission signal based on the transformed data, and transmitting the transmission signal. The modified Fourier transform applies to each of the modulation symbols an amount of phase change that is shifted from an amount of reference phase change by a phase offset.

Device and method for reducing peak-to-average power ratio in wireless communication system

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a method for performing properizing frequency shift (p-FRESH) vectorizing, the method comprising: converting a scalar-valued input signal of length L into a 2L-by-1 vector-valued output signal including complex conjugate signal of the input signal; modulating the input signal and the complex conjugate signal each with L different carriers; and bandpass filtering the modulated signal to form the output signal, wherein the output signal is band-limited to a half-Nyquist zone (F).

Apparatus and method for performing properrizing frequency shift(p-FRESH) vectorizing

A method and apparatus are described for aligning reception signals and interference signals by a base station (BS) configured to receive a signal from at least one user equipment (UE) in a cellular network. The reception signals are received from UEs belonging to a serving cell of the BS, and the interference signals are received from UEs belonging to a neighbor cell of the BS. A signal space receiving the reception signals and the interference signals is divided into a plurality of divided signal spaces, each having a size of N. K reception signals from among the reception signals are arranged in each divided signal space. The K reception signals arranged in each divided signal space are orthogonal to each other.

Interference alignment method and device in cellular network

The present invention relates to a method for modulating a signal, which is a signal modulation method for data communication, and the method comprises the steps of: forming a data symbol sequence to which a symbol 0 having the overall length of N are added, by adding M&#x2212;1 symbols 0 to each symbol of a data symbol sequence; performing an N-point fast Fourier transform for the data symbol sequence to which said symbols 0 are added; performing precoding for said fast-Fourier-transformed data symbol sequence; and forming a final transmission symbol sequence by performing an inverse fast Fourier transform for said precoded data symbol sequence. Further, the present invention relates to a transmitter which comprises: a symbol adding unit that forms a data symbol sequence to which the symbol 0 having the overall length of N is added, by adding M&#x2212;1 symbols 0 to each symbol of a data symbol sequence; a fast Fourier transform unit that performs an N-point fast Fourier transform for the data symbol sequence to which said symbols 0 are added; a precoding unit that performs precoding for said fast-Fourier-transformed data symbol sequence; and an inverse fast Fourier transform unit that forms a final transmission symbol sequence by performing an inverse fast Fourier transform for said precoded data symbol sequence.

Growing community of inventors

Pohang-si, South Korea

Joonho Cho