Electronics and Telecommunications Research Institute

Industrial Cooperation Chonbuk National University

University-industry Cooperation Group of Kyung Hee University

Chang-Joo Kim

Soon-Ik Jeon

Myung-Sun Song

Sung-Hyun Hwang

Gwangzeen Ko

Jung-Sun Um

Young-Bae Jung

Je-Hoon Yun

Soon-Young Eom

Jung-Ick Moon

Seong-Ho Son

Jae-Seung Yun

Hyung-Soo Lee

Je Hoon Yun

Cheol-Sig Pyo

Joung-Myoun Kim

Soon-Soo Oh

Sung-Jin You

Seung-Chan Bang

Il-Gyu Kim

Sang-Won Kim

Jae-Heung Kim

Myung Sun Song

Jong Hwa Kwon

Dong-Uk Sim

Ji-Hoon Bae

Jae-Ick Choi

Won-Kyu Choi

Sang Woon Kwak

Jong-Sik Lim

Jong-Moon Lee

Changhyun Park

Yong-Heui Cho

Moon-Won Lee

Ho-Kyung Son

Bub-Joo Kang

Jin Young Kim

Jong Ho Kim

Yong-Seok Choi

Jae-Young Kim

Chieteuk Ahn

Jung Sun Um

Jong-Ho Kim

Yong-Tae Lee

Sangsung Choi

Soon Ik Jeon

Chung-Gu Kang

Cheol-Ho Shin

Kyu-Min Kang

Hyunduk Kang

Yun-Hee Kim

Seung-won Kim

Sang-In Cho

Heon Jin Hong

Hyung Jung Kim

In-Kui Cho

Nak-Seon Seong

Seung-Sik Lee

Haeng-Sook Ro

Heon-Jin Hong

Hyuk-Je Kim

Sunmin Lim

Min-Sheo Choi

Ung-Hee Park

Young Keun Yoon

Jae-Wook Lee

Moon-Ho Lee

Jia Hou

Il-Hwan Kim

Kwang-Jae Lee

Simonov Nikolai

Hyung-Rae Park

Gwang-Zeen Ko

Seung-Ho Choi

Yury Borlsovich Korchemkin

Il-Kyoo Lee

You-Chung Chung

Jeong-Il Kim

Min-Sung Kwon

Sung-Uk You

Jung-Sun 408-205 Jugong-4Danji Apt 908 Um

Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. The pilot pattern selects pilot symbol positions based on distances from pilots of previous orthogonal frequency division multiple access (OFDMA) symbols to a subcarrier position of a current OFDMA symbol in the frequency domain and the time domain, so that a low pilot density is maintained so as to effectively transmit data, and stable channel estimation performance can be obtained even in a bad channel environment. In addition, the minimum burst allocation size is determined according to the channel environment between the base station and the terminal, guaranteeing channel estimation performance suitable for the channel environment, and improving granularity, channel estimation latency, and channel estimation memory size.

Method of generating pilot pattern for adaptive channel estimation in OFDMA systems, method of transmitting/receiving using the pilot pattern and apparatus thereof

A method provides an identifying OFDM communication signal using OFDM symbol estimation. In view of the above, the present invention provides an apparatus and method for identifying an OFDM communication signal using an OFDM symbol estimation, which is capable of analyzing the OFDM signal with a high accuracy in a cognitive radio technique, thereby identifying the OFDM signal from a heterogeneous communication signal.

Method for identifying OFDM communication signal using OFDM symbol estimation

A method and an apparatus for controlling transmit power of a CR device are provided. The method includes acquiring CR environment information regarding a licensed user or an unlicensed user occupying an adjacent channel or an adjacent cell of the CR device; determining a transmit power value of the CR device using the CR environment information; and generating transmit power control information including the transmit power value. The method and apparatus guarantee reliable communication of the CR device and minimize interference with the licensed user.

Transmission power control method and device for cognitive radio device

Provided is a hybrid beaconing method in which a centralized beaconing scheme and a distributed beaconing scheme are combined. In the hybrid beaconing method, a beaconing scheme is converted according to a network condition, and a centralized beaconing scheme or a distributed beaconing scheme is used to maintain an optimum network status.

Hybrid beaconing method

Provided is a large range management device (LRMD) of managing a communication between a plurality of small range devices (SRDs) and a plurality of large range devices (LRDs), the SRDs and the LRDs being located in a single cell and having different transmission coverage, the LRMD including an access slot allocation unit to allocate an SRD access slot to a radio resource for a downlink, to enable a first SRD to request an association from a network, a selection unit to select a communication relay device for relaying relay data of the first SRD, a relay slot allocation unit to allocate at least one SRD relay slot to a radio resource for an uplink, to enable the communication relay device to relay the relay data to a second SRD or another LRD, and a receiving unit to receive the relay data based on the at least one SRD relay slot.

Method and device for communication between devices with different transmission coverage

Provided are a method of adaptively allocating appropriate hybrid bursts according to terminal attributes including terminal position, channel state, and service type in an orthogonal frequency-division multiple access (OFDMA) system, and an upstream-MAP information element (US-MAP IE) structure supporting the method. The method includes dividing an upstream subframe into a plurality of zones depending on the number of OFDMA symbols and allocating bursts of a zone to a terminal according to the terminal attributes. Bursts are formed by allocating slots along a time axis in the upstream subframe, and are formed by allocating slots along a frequency axis in a downstream subframe.

Method and apparatus of hybrid burst mapping in OFDMA systems

Provided are methods of spectrum sensing and assigning quiet periods in a cognitive radio system in order to increase the reliability of detection regarding whether an incumbent user appears in his/her frequency channel, customer premises equipment (CPE), a base station, and the structure of a super frame for performing the methods. The spectrum sensing method includes communicating with a base station (BS) and performing spectrum sensing for frequency channels having quiet periods (QPs) during the QPs of the frequency channels used in the cognitive radio system, wherein the QPs of the frequency channels do not overlap each other

Method for sensing spectrum and arranging quiet period in cognitive radio system, customer premise equipment, base station and superframe structure using the same

A resource reservation method between a master device and a slave device or between slave devices in a centralized network. In resource reservation between slave devices, optimal resources may be allocated by performing link measurement between the slave devices before allocating the resources.

Reserving resources in centralized network by scanning superframes equal to or greater than maximum number of superframes allowed without listening to beacon period

Provided is a shaped-beam antenna having a multi-layered conductive element array surrounded by a dielectric ring. The shaped-beam antenna includes: a planar excitation element having a radiation structure according to a required polarization; a multi-layered conductive element array disposed on the planer excitation element, wherein the multi-layered conductive element array is formed by layering conductive elements at an arbitrary interval; and a dielectric ring surrounding the multi-layered conductive element array at a predetermined separation distance therefrom. Accordingly, it is possible to reduce the entire size of the shaped-beam antenna and manufacturing costs thereof.

Shaped-beam antenna with multi-layered metallic disk array structure surrounded by dielectric ring

A method and apparatus for detecting a signal using a cyclo-stationary characteristic value is provided. A method of detecting a signal using a cyclo-stationary characteristic value includes: calculating cyclo-stationary characteristic values with respect to a cyclic frequency domain of an input signal; multiplying the calculated cyclo-stationary characteristic values with each other; and detecting the signal from the input signal based on the result of the multiplication.

Method and apparatus for detecting signal using cyclo-stationary characterisitics

A channel switching method is provided for a base station to allocate a slot for data exchange with each of a plurality of terminals in a frequency channel that is not used by an incumbent user (IU). The method includes include transmitting a channel switching message for requesting to switch to a backup channel when a signal of the IU is sensed in the frequency channel; transmitting a beacon frame via the backup channel, wherein the beacon frame comprises allocation information about slots which are in the frequency channel and which are respectively allocated to each of the plurality of terminals; and allocating the slot for data exchange with each of the plurality of terminals to the backup channel according to the allocation information, and communicating with each of the plurality of terminals.

Channel switching apparatus and method of a base station and channel switching apparatus and method of a terminal based on the cognitive radio system

Provided is a loop antenna. The loop antenna includes a first antenna element embodied as a coaxial cable, a second antenna element embodied as a line and connected to one end of the first antenna element in series, a third antenna eLement embodied as a line, having one end connected to a ground plane and the other end connected to the other end of the first antenna element in series, and a power feeding cable for supplying power to the second antenna element.

Loop antenna

An image reconstruction apparatus includes: a transmission signal generation unit configured to generate a transmission signal in an image reconstruction region, in order to acquire an image reconstruction value; an electromagnetic wave measurement unit configured to measure electromagnetic waves by receiving the transmission signal; an image reconstruction unit configured to update a parameter by using a matrix of matched system of a Sinc-Gauss-shaped basis function which is allocated to each node of a reconstruction mesh in the image reconstruction region, and generate an image reconstruction value; and an optimization determination unit configured to determine whether the parameter of the image reconstruction unit is optimized or not, and output the image reconstruction value or cause the image reconstruction unit to repetitively perform the calculation, wherein the reconstruction mesh has a grid structure of which the size is larger than that of a forward mesh and equal to the image spatial resolution.

Image reconstruction apparatus and method for reconstructing image of microwave tomography thereof

Growing community of inventors

Daejeon, South Korea

Chang-Joo Kim