Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Inha-industry Partnership Institute

Seoul National University

Yonsei University

Jae-Hak Chung

Seung-Hoon Nam

Chan-Soo Hwang

Yung-Soo Kim

Young-Ho Jung

Vahid Tarokh

Ho-Jin Kim

Chan-Byoung Chae

Won-Il Roh

Jong-Hyeuk Lee

Eung-sun Kim

Joo-Hwan Chun

Hong-Sil Jeong

Sung-ryul Yun

Yong-Hoon Lee

Jeong-Tae Oh

Kyun-Byoung Ko

Dong-seek Park

Sung-Jin Kim

Jong-Ho Lee

Young-soo Park

Young-Soo Kim

Hak-Ju Lee

Sung-Ryul Yun

Young-Soo Park

Chung-Yong Lee

Sung-Hyun Cho

Ki-ho Kim

Seijoon Shim

Kyeongyeon Kim

Chungyong Lee

Kyung-Whoon Cheun

Dong-Seek Park

Duck-Dong Hwang

Sang-Jo Yoo

Jae-Myeong Kim

Kyung-Chun Lee

Il-Han Kim

Junhong Hui

Pandharipande Ashish

Kyoung-Jin Cho

Kwon-Moon No

Chang-Soo Hwang

Kwang-Bok Lee

Ye-Hoon Lee

Seong-Cheol Kim

Hyoung-Woon Park

Chan-soo Hwang

Do-Young Kwak

Hong-Sun Park

Ji-Won Kang

Chang-Gun Seo

Hak-Joo Lee

Tae-Jin Jung

Yoon-Ok Cho

Jae-Choong Han

Kyung-Chun c/o Elect Engine & Comp Science Lee

Vahid Samsung Electronics Co Ltd Tarokh

Chan-Soo Samsung Electronics Co Ltd Hwang

Eung-Sun Kim

Sung-Ryul 811-806 Byeokjeokgol Yun

Chang-Byoung Chae

Chan Byoung Chae

Il-Han c/o Elect Engine & Comp Science Kim

Joo-Hwan c/o Elect Engine & Comp Science Chun

A method for assigning a single frequency sub-channel to a plurality of MSs (Mobile Stations) in an OFDM (Orthogonal Frequency Division Multiplexing) system utilizing SDM (Spatial Division Multiplexing) with multiple transmit/receive antennas. In the method, a BS (Base Station) can effectively assign a pilot channel to estimate a downlink channel. The BS divides the single frequency sub-channel into a plurality of spatial channels, and sequentially assigns the plurality of spatial channels to the MSs having the maximum communication capacity, thereby transmitting signals of the MSs through the single frequency sub-channel.

Method for assigning channels based on spatial division multiplexing in an orthogonal frequency division multiplexing system with multiple antennas

An adaptive subchannel and bit allocation method in a wireless communication system. A mobile station analyzes channel quality information of a subchannel at a predetermined period and determines a feedback band index with a maximum decision criterion. The mobile station feeds back the determined feedback band index with the maximum decision criterion to a base station. The base station generates band allocation information using the feedback information from the mobile station, and transmits the band allocation information to the mobile station. The mobile station transmits AMC information using the band allocation information received from the base station. The base station estimates a channel using the AMC information transmitted from the mobile station and allocates bits to the allocated band according to the channel estimation result.

Adaptive subchannel and bit allocation method using partial channel information feedback in an orthogonal frequency division multiple access communication system

Dynamic frequency selection based on CR is provided. A CR BS detects an interference-free and unused frequency band. When sensing a new BS that has great signal strength and requires the frequency band during communications in the frequency band, the CR BS releases the frequency band and dynamically selects another frequency band to avoid interference.

Method for dynamic frequency selection and system supporting the same in a cognitive radio wireless communication system

A transmitter in a multiple input multiple output (MIMO) communication system is provided. The transmitter includes a multiplexer for multiplexing an input bit stream into a plurality of bit streams, and outputting the bit streams in parallel; a bit-order rearranger for reordering bits constituting the bit streams, which are output from the multiplexer in the same time period, and outputting the reordered bits as reordered bit streams; and a modulator for modulating the parallel reordered bit streams output from the bit-order rearranger according to their associated modulation schemes, and transmitting the modulated symbols via their associated antennas.

Transmission apparatus and method for MIMO system

An explicit outband signaling method for detecting sharable resources for management of public resources in a wireless network supporting Cognitive Radio (CR) technology. To this end, the invention transmits state information for the current channel to a CR system in order to enable communication of the CR users, whose communication with the CR system is impossible due to an influence of an incumbent system, thereby allowing the CR system to stop the use of the interference channel, and to provide a corresponding service with another channel.

Explicit outband signaling method in a wireless network supporting cognitive radio technology

A communication initialization method at a MAC layer in a CR wireless communication system is provided. The use or non-use of a frequency band is sensed over a broadband with a minimized sensing time in a non-interfering manner with existing communication systems.

Communication initialization method at medium access control layer in a cognitive radio wireless communication system

A resource management method in a Cognitive Radio communication system where at least two Base Stations of heterogeneous networks provide a connection service to Mobile Stations within their service areas is provided. In the method, at least one BS having candidate resources broadcasts its candidate resource information on the downlink of a system information channel. At least one BS lacking in resources searches the downlinks of system information channels from neighbor heterogeneous networks, selects an offer BS among the BSs having candidate resources, and rents resources from the selected offer BS by negotiations.

Method of managing resources in a cognitive radio communication system

A method for transmitting to one cell a frame including broadcast channels in a cellular wireless communication system in which a base station supports a plurality of physical channels corresponding to the broadcast channels. The base station generates the frame and transmits the generated frame to a mobile station. The frame includes separate broadcast channels for the respective physical channels. A position, in the frame, of a first broadcast channel for a physical channel capable of supporting a mobile station having the worst channel state is fixed in all of transmission frames. The first broadcast channel includes positional information of the remaining broadcast channels except for the first broadcast channel. The mobile station detects only an address of a broadcast channel for a physical channel allocated thereto from the first broadcast channel among broadcast channels belonging to the frame.

Method for transmitting broadcast channel in a cellular wireless communication system

A method of partitioning resources in a CR wireless communication system and a system supporting the same are provided. A new BS receives radio resource status information from a prior BS using a particular frequency band, and requests resource partitioning to the prior BS using a new uplink subchannel defined for communications between BSs. Resource negotiation messages are exchanged over a channel defined between the two BSs so as to efficiently partition resources between the BSs.

Method of partitioning resources in a cognitive radio wireless communication system and system supporting the same

A transmitter and a receiver are disclosed herein that support transmit antenna diversity using space-time block coding in a wireless communication system. The transmitter produces symbol combinations containing, as their elements, input symbols, the inversions and conjugates of the symbols, and symbols obtained by rotating the phases of the symbols once, forms a matrix having symbols in at least two columns orthogonal to each other with the symbol combinations, and transmits the matrix. The receiver detects symbols that minimize maximum likelihood (ML) decoding metrics over all possible symbols using channel gains from transmit antennas to a receive antenna. Also, the receiver selects candidate symbols among all possible symbols according to the characteristics of transmitted modulation symbols and detects symbols that minimize the ML decoding metrics.

Transmitting and receiving apparatus for supporting transmit antenna diversity using space-time block code

A differential STBC transmitting/receiving apparatus in a multiple antenna system using eight or less transmit antennas is provided. In the differential STBC transmitting apparatus, a symbol mapper receives binary data and generates a number of symbols from the binary data, each symbol having a number of bits. A space-time block encoder generates an STBC by encoding the symbols. A differential processor differentially encodes the STBC through feedback and delay. A distribution matrix processor substitutes the differentially coded STBC into a distribution matrix preset according to the number of transmit antennas, and outputs the differential STBC code of the distribution matrix to the transmit antennas.

Differential space-time block coding apparatus using eight or less transmit antennas

The present invention relates to a transmitter and a transmission method in communication system using three Tx antennas in order to maximize STFBC coding gain. An input symbol sequence is transmitted through a plurality of Tx antennas in a predetermined method.

Apparatus and method of space time frequency block code

A multiple-input multiple-output (MIMO) communication system is provided for communication between a transmission apparatus having a plurality of transmission antennas and a reception apparatus having a plurality of reception antennas. The reception apparatus performs singular value decomposition (SVD) on channel information for a channel established to the transmission apparatus, and feeds back the SVD-decomposed channel information to the transmission apparatus. The transmission apparatus receives the SVD-decomposed channel information from the reception apparatus, performs QR decomposition on the received SVD-decomposed channel information, and sets multiple transmission antennas to be allocated to the channel, thereby performing beamforming.

Method and apparatus for transmitting/receiving data in a multiple-input multiple-output communication system

A pilot designing method in an uplink OFDMA system is provided. In the uplink OFDMA system, communications are carried out in a frame divided into time-frequency lattices, and each time-frequency lattice includes a plurality of data symbol periods and a plurality of pilot symbol periods intermittently arranged with respect to the data symbol periods. The frame is divided into a plurality of blocks. The blocks are allocated to the terminals. A predetermined allocated pilot time-frequency lattice is shared between adjacent terminals.

Pilot designing method in an uplink OFDMA system

Provided is a scheduling apparatus and method for allocating resources to individual users in a multiantenna system. The method includes determining a ratio of time slots to be allocated according to a ratio desired by each of the terminals in every specific time slot interval, calculating a channel capacity average and a standard deviation for each terminal according to channel capacity reported from each terminal for a specific time, and determining, based on the determined ratio of time slots, a terminal to which a specific time slot is to be allocated according to the channel capacity average and the standard deviation, calculated for each terminal, and the last reported channel capacity.

Apparatus and method for scheduling resources in a multiantenna system

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Seoul, South Korea

Jae-Hak Chung