Electronics and Telecommunications Research Institute

Samsung Electronics Co., Ltd.

Jung Hoon Oh

Gweon Do Jo

In Kui Cho

Jang Yeol Kim

Jae Ho Jung

Young Kyun Cho

Bong Hyuk Park

Kwangchun Lee

Heon Kook Kwon

Jung Nam Lee

Jae Ho Lee

Hyun Joon Lee

Young-Hoon Kim

Young-il Kim

Jae Woo Lee

Jung Ick Moon

Seong Min Kim

Je Hoon Yun

Nam Hoon Park

Jae Sun Cha

Woo Jin Byun

Tae Joon Park

Jae Su Song

Hyung Jin Kim

Kwang Chun Lee

Sang Won Kim

Seok Seo

Chang Wahn Yu

Seong Chul Cho

Eun Hee Kim

Jaeho Lee

Hyunjoon Lee

Byung Su Kang

Seung Kwon Cho

Kye Seon Lee

Su Chang Chae

Provided is a microstrip array antenna including a dielectric substrate, a feed line formed on a top surface of the dielectric substrate, a plurality of radiation elements formed on the top surface of the dielectric substrate and electrically connected to the feed line, and a ground surface formed on a bottom surface of the dielectric substrate. At least one radiation element among the plurality of radiation elements may have a bottleneck shape.

Microstrip array antenna

An operation method of a first communication node may comprise: receiving one or more polarized radio signals transmitted from a second communication node included in the communication system through one or more receive polarized antennas included in the first communication node; performing a receive polarized antenna alignment state adjustment operation so that a detection result for a magnitude of an electric field excited by the one or more polarized radio signals is maximized; and receiving a first polarized signal transmitted from the second communication node through at least part of the one or more receive polarized antennas based on a result of the receive polarized antenna alignment state adjustment operation.

Method and apparatus for radio signal transmission and reception in communication system

An operation method of an access point (AP) and a terminal, in a wireless time sensitive network (WTSN), may comprise: receiving, by an AP, an uplink frame from a first terminal; generating compensation indication information for compensation to be performed in the first terminal according to channel information between the first terminal and the AP estimated based on the uplink frame; transmitting the compensation indication information to the first terminal through a downlink frame; and performing, by the first terminal, the compensation based on the compensation indication message transmitted through the downlink frame.

Frame structure and terminal synchronization method and apparatus in wireless communication system

An antenna device for magnetic field communication may include: a first coil; a second coil; a third coil; a first capacitor connected to a 1-1 terminal of the first coil; a second capacitor connected to a 2-1 terminal of the second coil; a third capacitor connected to a 3-1 terminal of the third coil; and an input port including a first input terminal connected to a 1-2 terminal of the first coil, a 2-2 terminal of the second coil, and a 3-2 terminal of the third coil, and a second input terminal connected to the first capacitor, the second capacitor, and the third capacitor.

Method and apparatus for magnetic field communication

A communication method of a wireless device to which a single radio frequency (RF) chain antenna is applied. The wireless device stores a plurality of beam sets for the single RF chain antenna and a plurality of quality values for the plurality of beam sets. The wireless device selects a first beam set having a first quality value that is a best quality value among the plurality of stored beam sets. The wireless device confirms a second quality value for the first beam set using received data when the data are received using the first beam set. The wireless device selects a second beam set different from the first beam set among the plurality of stored beam sets when the second quality value is poorer than the first quality value.

Communication method and apparatus using single radio frequency chain antenna

A receiving device and method using a single RF chain includes a reception antenna module radiating a plurality of orthogonal beam patterns to receive a signal, a single RF chain processing a reception signal from the reception antenna module, a signal component extracting unit extracting a reception signal component corresponding to each beam pattern using the reception signal received through the reception antenna module and the single RF chain and a code value previously allocated to the plurality of beam patterns, and a beam pattern controller controlling a beam pattern radiated by the reception antenna module.

Receiving device and method using single RF chain

Provided is a dual-polarized dipole antenna. The dual-polarized dipole antenna includes a substrate etched as first and second microstrip lines and provided in a cube, first to fourth feeding lines etched as third microstrip lines and disposed in a square type in a vertical direction to the substrate, and first to fourth radiation patches disposed in a square type in the vertical direction to the first to fourth feeding unit, wherein the first to fourth feeding units are respectively disposed on adjacent pairs of the first to fourth radiation patches. According to the present invention, a miniature dual-polarized dipole antenna having a wide bandwidth, high isolation characteristics, and a high gain can be provided.

Dual-polarized dipole antenna

A smart antenna system according to an exemplary embodiment of the present invention including a beam forming antenna which includes an active antenna and a plurality of parasitic antennas, the system including: a reactance load which is connected to the parasitic antenna; a transceiver which transmits and receives a signal to the beam forming antenna; and an antenna adjusting block which tracks a signal source in real time using a plurality of beam patterns having the largest signal size and forms a beam in a direction having the largest signal size.

Smart antenna system and method for improving receiving performance thereof

Provided is a transceiver. The transceiver includes: a transmission unit modulating at least one of a plurality of baseband transmit signals to an RF band and amplifying the modulated at least one; a duplexer transmitting transmit signals outputted from the transmission unit to an antenna by selecting a signal in a downlink frequency band or an uplink frequency band or filtering a receive signal received from the antenna by the downlink frequency band or the uplink frequency band; a reception unit demodulating the receive signals in the downlink frequency band or the uplink frequency band from the duplexer into at least one baseband signal; a first switch delivering a transmit signal provided from the transmission unit to a first RF band filter of the duplexer in a first communication mode and a second communication mode; and a second switch delivering a first receive signal delivered from a second RF band filter of the duplexer to the reception unit in the first communication mode and a third communication mode, wherein each of the transmission unit and the reception unit includes one power amplifier and one low noise amplifier.

Mode switching available wireless transceiver

Provided is a beam forming device. The beam forming device of the present invention may feedback power-amplified signals to perform digital pre-distortion for improving the non-linearity of an analog element in a digital signal process terminal and control a phase for forming a beam. Therefore, the beam forming device that can form an accurate beam may be realized.

Beam forming device and method for forming beam using the same

Provided is a loop filter for a data converter in a wireless communication system that improves both an anti-aliasing filtering characteristic and a power consumption characteristic, the loop filter including first and third resistors sequentially connected to an input end, fourth and second resistors sequentially connected to between an inverting output end and ground, a first capacitor connected to between another end of the first resistor and one end of the fourth resistor, a second capacitor connected to between the one end of the fourth resistor and the output end, a third capacitor connected to between another end of the third resistor and the output end, and an operational amplifier, wherein an inverting end of the operational amplifier is connected to the other end of the first resistor and a non-inverting end of the operational amplifier is connected to ground to output an operational amplifier response to the output end.

Loop filter for data converter in wireless communication system and method of implementing corresponding loop filter

Disclosed are a signal distortion component adjusting apparatus and method capable of adjusting error vector magnitude of subcarriers of a predetermined position by adjusting a signal distortion component occurring while decreasing a peak to average power ratio (PAPR) in a communication system of an orthogonal frequency division multiplexing (OFDM) technology or an orthogonal frequency division multiple access (OFDMA) scheme, and a system using the same. The present invention includes a signal distortion component adjusting unit to add an additional signal distortion component Pe((n+N/2) % N) to a signal distortion component e(n) that is obtained by subtracting a threshold Th value, set to decrease peak power, from an absolute value of a time domain signal x(n) of an input signal, and to thereby adjust the signal distortion component. The present invention may transmit a highly reliable signal by adjusting error vector magnitude of subcarrier of a frequency domain.

Apparatus and method for controlling distortion signal and system by using the same

Provided is a predistortion apparatus which performs predistortion by reflecting a memory effect when linearizing an output of a nonlinear device using a wideband signal. The predistortion apparatus includes a predistortion unit and a coefficient extraction unit. The predistortion unit selects and outputs one of outputs of the sub-predistorters as an output signal according to intensity of an input signal. The coefficient extraction unit selects one of a plurality of coefficient extractors according to intensity of a nonlinear signal which is generated in response to the output signal, extracts a plurality of predistortion coefficients with the nonlinear signal and the output signal, and delivers the extracted predistortion coefficients to the predistortion unit. Accordingly, the memory effect is reflected even when the input signal is a wideband signal.

Predistortion apparatuses and methods

A communication method according to the present invention includes receiving MAP in formation, acquiring an initial scheduled frame number and a current frame number from the MAP information, calculating the difference between the initial scheduled frame number and the current frame number, comparing the difference between the initial scheduled frame number and the current frame number with a reference value and setting a scheduled frame number, and performing transmission or reception in the scheduled frame. Therefore, even though a MAP loss occurs, the mobile station can receive only downlink data effective in downlink, thereby reducing power consumption for unnecessary reception, and can exactly perform transmission in a frame in which it should transmit in uplink.

Growing community of inventors

Daejeon, South Korea

Jung Hoon Oh