Electronics and Telecommunications Research Institute

Yong Su Lee

Youn Ok Park

Kwang Jae Lim

Won Geun Ryu

Young-il Kim

Wenbo Wang

Wooram Shin

Anseok Lee

DongSeung Kwon

Seung Jae Bahng

Hyun-jae Kim

Dae Geun Park

Hyeong Sook Park

Kan Zheng

Jun Woo Kim

Ji Soo Park

Young Il Park

The exemplary embodiment of the present invention provides a beam selecting apparatus of a fixed beam terminal, including: a delay time measuring unit which measures delay times of a plurality of signals received through a plurality of beams; a beam selecting unit which compares a threshold value selected based on the measured delay time and a signal strength of each of the plurality of signals to select a beam; and a switching type beam former which operates the plurality of beams in accordance with the selected beam.

Beam selection apparatus and method for selecting beam in a fixed beam terminal

Disclosed is a base station transmitting multiple beams to multiple beam areas, including: a determination unit determining at least any one of whether a downlink control signal is transmitted through the multiple beams transmitted to the multiple beam areas and a transmission section; a generation unit generating signal transmitting control information including at least any one of whether the downlink control signal is transmitted, the transmission section of the downlink control signal, and derivation information to derive a change of an access beam for a terminal that accesses the multiple beams; a communication unit downlink-transmitting the signal transmitting control information to the multiple beam areas or the multiple beams; and a control unit controlling transmission of the downlink control signal based on the signal transmitting control information.

Base station and signal transmitting control method of the same, and wireless communication system

Disclosed are an apparatus for controlling a wide-band signal transmission gain, which differently applies a transmission gain by the unit of an intermediate frequency (IF) at a transmitting side of a wide-band multi-IF wireless communication system which can convert multiple baseband digital signals into IF signals and thereafter, multiplex and simultaneously transmit the converted IF signals and a signal processing method of the same.

Apparatus for controlling wide-band signal transmission gain in wireless communication systems and signal processing method of the same

A beamforming apparatus and method for expanding coverage of a control channel are provided, by which neighboring communication devices are classified according to the number of beams that they can receive, and therefore the frequency or period of beam transmission is adjusted to transmit a control channel by a beamforming method. Hence, an overhead reduction and an increase in transmission rate can be achieved, and coverage holes can be prevented.

Method and apparatus for beamforming in wireless communication system

A method and an apparatus for acquiring initial synchronization in a wireless communication system are provided. A relay station determines whether or not the initial synchronization is acquired, determines a start position of a frame using a peak of an autocorrelation signal detected based on a preamble and a relay-amble (R-amble) received from a base station in the case in which the initial synchronization is not acquired, and determines the start position of the frame using a peak of an autocorrelation signal detected based on the relay-amble received from the base station in the case in which the initial synchronization is acquired.

Method and apparatus for acquiring initial synchronization using relay-amble in wireless communication system

Provided is a method and system for estimating a channel in a wireless communication system. An interference coefficient is calculated based on a known structure of a pilot, and a channel value in a frequency domain is estimated. A channel value in a time domain is obtained by transforming the channel value in the frequency domain and the channel delay values are subtracted from the channel value in the time domain, thereby cancelling interference.

Channel estimating method in wireless communication system and apparatus thereof

Growing community of inventors

Daejeon, South Korea

Yong Su Lee