Electronics and Telecommunications Research Institute

Samsung Electronics Co., Ltd.

Kt Corporation

Sk Telecom Company, Ltd.

Ktfreetel Co., Ltd

Moon-Sik Lee

Young-Hoon Kim

Seung-Chan Bang

Seung Chan Bang

Kapseok Chang

Il-Gyu Kim

Hyeong-Geun Park

Ji Hyung Kim

Bong Hyuk Park

Hui Dong Lee

Ik Jae Chun

Nam-Il Kim

Hoo Sung Lee

Seon-Ae Kim

Hye-Kyung Jwa

Soo Chang Kim

Jae Seung Lee

Byung-Jae Kwak

Kap-Seok Chang

Ohyun Jo

Yong-baek Yoo

Jeeyon Choi

Hyoseok Yi

Ok-Sun Park

Gyung-chul Shin

Jaewoo Park

Sunwoo Kong

Seok-jin Lee

Eun-Jeong Shin

Taesoo Kwon

Tagoku Izumi

A method and apparatus for transmitting data. Data to be transmitted is an aggregated frame including a first subframe and a second subframe each including information used to verify integrity of each subframe, and an apparatus receiving the data verifies integrity of a subframe based on the information used to verify the integrity.

Method and apparatus for transmitting data

A method and an apparatus for secondary synchronization in the Internet of things. The receiving apparatus extracts a frequency domain sample by applying channel estimation to a time domain sample of the secondary synchronization signal. Further, the receiving apparatus estimates a physical cell ID (PCI) and 80 ms frame timing (FT) based on decorrelation between a frequency domain standard signal of the secondary synchronization signal and the frequency domain sample.

Method and apparatus for secondary synchronization in internet of things

A method and an apparatus for primary synchronization in the Internet of things. A receiver samples a primary synchronization signal into a digital signal to generate a first sampling signal and down sample a first sampling signal into a second sampling signal. The receiver estimates a first sample timing offset (STO) and a first frequency offset (FO) using the first sampling signal and the second sampling signal.

Method and apparatus for primary synchronization in internet of things

A method and an apparatus for generating a synchronization signal in the Internet of things. In the method for generating a synchronization signal, subcarrier mapping may be performed by exchanging a signal allocated to an upper subcarrier group and a signal allocated to a lower subcarrier group among all subcarriers allocated for the synchronization signal with each other, in an in-band operation mode or a guard band operation mode of the Internet of things.

Method and apparatus for generating synchronization signal in internet of things

Provided are a communication method based on device's property and an apparatus for allocating a resource by using the method. Devices are classified based on the device's property and a signal including information based on the resource allocation to the devices is transmitted to the devices. Data are received from a device through the allocated resource. Here, the devices transmitting pilot signals including device data values corresponding to preset expected reference data information transmit data through the allocated resource.

Communication method based on device's property and apparatus for allocating resource by using the method

A high frequency amplifier circuit includes a transistor including a drain, a gate, and a source, an inductance-capacitor (LC) tank connected to the drain, and a transformer connected to the gate and the source.

Circuit for amplifying radio signal using high frequency

A method and apparatus for near field communication (NFC) are provided. A reader searches for communication with another party according to a first communication method of transmitting a communication request signal or a reader searches for communication with another party according to a second communication method of performing wireless power transmission. When the reader receives a response signal from communication with another party, the reader performs communication with the other party.

Method and apparatus for near field communication

A method of transmitting a frame header in wireless communication includes: forming a frame header by integrating a MAC header and a PHY header; repeatedly transmitting the frame header multiple times to a scrambler; and generating, by the scrambler, data by scrambling the repeatedly transmitted frame header with a specific code.

Frame header transmitting device and method of transmitting frame header using the same

If a master device in device-to-device direct communication designates an object type of a target to be communicated with, transmits a target discovery request message including the object type of the target to be communicated with to a plurality of neighboring target devices, and receives a target discovery response message from one or more target devices corresponding to the object type of the target to be communicated with among the plurality of target devices, the master device determines one target device among one or more target devices as the target to be communicated with.

Method and apparatus for discovering target in device-to-device direct communication

Provided is an oscillation circuit including a voltage adjuster adjusting a magnitude of a power supply voltage according to a digital signal, an LC tank circuit connected between first and second nodes and generating a resonance signal on a basis of the magnitude adjusted power supply voltage, and a differential amplification circuit oscillating the resonance signal or modifying an oscillation state of the resonance signal to output first and second output voltage signals to the first and second nodes, respectively.

Oscillation circuit and transmitter including the same

A transmit power control method of a terminal in direct communication between terminals is disclosed. The terminal measures a path loss gain of a base station, and compares the measured path loss gain with a predetermined threshold value. The terminal sets a power value for direct communication in the case in which the measured path loss gain is less than or equal to the predetermined threshold value, and performs the direct communication at the set power value.

Transmit power control method of terminal in direct communication between terminals, and terminal supporting the same

Provided is a method of forming a random access preamble structure for an extended cell radius in a cellular system, the method including: generating a cyclic prefix (CP), which is the sum of a maximum delay spread and the maximum round trip delay according to the extended cell; generating a preamble sequence part. The method is used to form a preamble structure for an extended cell radius from among random access preamble structures transmitted when initial synchronization is achieved, when synchronization is lost, or when a handover is performed, during a random access process of the cellular system.

Random access preamble structure in extended cells environment

An apparatus for spatial filtering receives a signal transmitted from a first terminal and detects a synchronization start point in time from a transmission frame included in the signal. The apparatus for spatial filtering demodulates a user-defined sequence included in the transmission frame and the at least one SRJBF sequence when the synchronization start point in time is detected, and then estimates a relative angle based on the demodulated user-defined sequence and SRJBF sequence.

Apparatus and method for spatial filtering by estimating angle of deviation for line of sight of user

Provided are a reception apparatus and transmission apparatus for supporting a scalable bandwidth in a carrier aggregation environment. The reception apparatus and transmission apparatus can link carrier aggregation technology and scalable bandwidth technology by supporting a scalable bandwidth having different bandwidths in size in a carrier aggregation environment, thereby enhancing compatibility between different wireless communication systems.

Reception apparatus and transmission apparatus for supporting scalable bandwidth in carrier aggregation environment

Provided are a receiver and a receiving method for a scalable bandwidth in a mobile station of an Orthogonal Frequency Division Multiplexing (OFDM) system. The receiving method includes the steps of: (a) filtering a received RF signal; (b) oscillating a frequency according to a center frequency control signal to output a local oscillation frequency; (c) down-converting the filtered RF signal by using the local oscillation frequency; (d) scalable-filtering the down-converted signal while adjusting a bandwidth according to a bandwidth control signal; (e) controlling gain of the scalable-filtered signal; (f) converting the gain-controlled analog signal into a digital signal by using a sampling frequency matching with a corresponding bandwidth according to an ADC control signal; and (g) demodulating the converted digital signal, outputting the center frequency control signal, the bandwidth control signal, and the ADC control signal according to control information received from an upper layer.

Growing community of inventors

Daejeon, South Korea

Moon-Sik Lee