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公开(公告)号：KR101160424B1
公开(公告)日：2012-06-28
申请号：KR1020100111140
申请日：2010-11-09
Applicant: 서울대학교산학협력단
IPC: H04B7/04
Abstract: PURPOSE: A cooperation transmission method and an apparatus thereof are provided to perform user scheduling of a multiple antenna wireless system in order to obtain a multiple user diversity gain. CONSTITUTION: An apparatus determines a user group having channel correlation characteristics by using quantized channel correlation information(203). The apparatus selects a user according to the channel quality of group users(204). The apparatus transmits a signal by using a transmission beamforming method(205,206).
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62.发明公开주 통신기기와 다수의 단말 통신기기들로 구성된 통신 시스템에서 동일 채널 내에 존재하는 간섭 신호의 영향을 회피하면서 신호를 전송하는 방법 有权避免直接序列传播频谱系统中共频干扰的装置和方法
公开(公告)号：KR1020120032313A
公开(公告)日：2012-04-05
申请号：KR1020100093904
申请日：2010-09-28
Applicant: 서울대학교산학협력단
IPC: H04B1/707
CPC classification number: H04L1/0034 , H04J11/003
Abstract: PURPOSE: A signal transmission method is provided to reduce a hand-off delay phenomenon by utilizing bandwidth and frequency interference channel information. CONSTITUTION: A network is constituted between a main transmission and reception apparatus and a terminal(201). Devices are operated in a signal channel transmission and reception mode which uses a Ω channel(202). The devices are operated in an MT(Multi-channel Transmission) mode through channels included in the Ω channel(203). The main transmission and reception apparatus measures a link state. The main transmission and reception apparatus notifies an optimal channel to the terminal.
Abstract translation: 目的：提供信号传输方法，通过利用带宽和频率干扰信道信息来减少切换延迟现象。 构成：在主发送接收装置和终端（201）之间构成网络。 设备在使用Ω通道（202）的信号通道发送和接收模式下操作。 这些设备通过Ω通道（203）中包含的通道以MT（多通道传输）模式运行。 主发送和接收设备测量链路状态。 主发送接收装置向终端通知最佳信道。
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公开(公告)号：KR1020110081592A
公开(公告)日：2011-07-14
申请号：KR1020100001826
申请日：2010-01-08
Applicant: 서울대학교산학협력단
CPC classification number: H04B7/0639 , H04B7/0641 , H04B7/0663 , H04L5/0023 , H04L25/0204 , H04L25/022 , H04L25/0224 , H04L25/03949 , H04B7/0617 , H04L27/2695
Abstract: PURPOSE: A transmit beamforming method and apparatus in an OFDM based multiantenna wireless system are provided to reduce a feedback information quantity or the quantization error of a codebook. CONSTITUTION: A channel information estimator and a channel correlation information generator(201) estimates channel information from a pilot signal and deduces time and frequency channel correlation information from the estimated channel information. A beam weight estimator(205) estimates a beam weight for a present channel. A differential vector generation and quantization unit(207) quantizes a differential vector using a defined codebook.
Abstract translation: 目的：提供基于OFDM的多天线无线系统中的发射波束形成方法和装置，以减少码本的反馈信息量或量化误差。 构成：信道信息估计器和信道相关信息生成器（201）从导频信号估计信道信息，并从所估计的信道信息推断出时间和频率信道相关信息。 光束权重估计器（205）估计当前信道的光束权重。 差分矢量生成和量化单元（207）使用定义的码本对差分矢量进行量化。
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公开(公告)号：KR1020100028735A
公开(公告)日：2010-03-15
申请号：KR1020080087598
申请日：2008-09-05
Applicant: 서울대학교산학협력단
CPC classification number: H04L25/0224 , H04L27/2611 , H04L27/2675 , H04L27/2695
Abstract: PURPOSE: A method and a device for estimating a channel in a multi cell wireless communication system based on OFDMA are provided to re-estimate a channel of a pilot signal using a channel estimation weight. CONSTITUTION: A target channel of a preamble signal transmitted from a target base station is estimated(310). The target channel of the pilot signal transmitted from the target base station is estimated(320). The correlation between the target channels of the pilot signal and the estimated preamble signal is estimated(330). A target channel estimation weight for re-estimating the target channel of the pilot signal is determined using the estimated correlation(340). The target channel of the pilot signal is re-estimated using the determined target channel estimation weight and the target channels of the estimated preamble signal and the pilot signal(350).
Abstract translation: 目的：提供一种用于基于OFDMA估计多小区无线通信系统中的信道的方法和装置，以使用信道估计权值重新估计导频信号的信道。 构成：估计从目标基站发送的前同步码信号的目标信道（310）。 估计从目标基站发送的导频信号的目标信道（320）。 估计导频信号的目标信道与估计的前导信号之间的相关性（330）。 使用估计的相关性（340）确定用于重新估计导频信号的目标信道的目标信道估计权重。 使用所确定的目标信道估计权重和所估计的前导码信号和导频信号的目标信道（350）来重新估计导频信号的目标信道。
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公开(公告)号：KR101859579B1
公开(公告)日：2018-05-18
申请号：KR1020110065359
申请日：2011-07-01
Applicant: 삼성전자주식회사 , 서울대학교산학협력단
CPC classification number: H04W72/082 , H04W16/16
Abstract: 본발명은이종셀 무선통신시스템에서자원할당방법및 장치에관한것으로, 본발명의일 실시예에따르는제1 유형기지국및 제2 유형기지국을포함하는이종셀 무선통신시스템에서제1 유형기지국이자원할당하는방법은, 상기제1 유형기지국이사용하는주파수할당대역(FA; Frequency Assignment) 중인접제2 유형단말이사용하지않는 FA를추정하는추정단계및 상기인접제2 유형단말이사용하지않는 FA 중어느하나에속하는부채널(sub-channel)을제1 유형단말에할당하는단계를포함할수 있다. 본발명의일 실시예에따르면, 이종셀 시스템의채널용량을최대화할수 있는효과가있다.
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Patent Agency Ranking
公开(公告)号：KR101768362B1
公开(公告)日：2017-08-16
申请号：KR1020160021797
申请日：2016-02-24
Applicant: 서울대학교산학협력단
Abstract: 본발명은대규모다중안테나를사용하는다중사용자무선통신시스템에서사용자들의채널정보를실시간으로추정하는방법에관한것이다. 기존시스템의공용파일럿을통한순시채널정보추정방법은대규모다중안테나시스템에서많은파일럿신호가요구되어실장이용이하지못하다. 이를해결하기위해채널의공간상관정보를이용하여순시채널정보를추정하는방법이제안되고있으나, 채널의공간상관정보에대한추정방법이추가적으로고려되어야한다. 따라서, 본발명에서는원거리지역효과(far-field effect)를활용하여적은파일럿신호만으로채널의공간상관정보를정확히추정함으로써순시채널정보추정효율을크게올릴수 있는기법을제안한다.
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公开(公告)号：KR101716983B1
公开(公告)日：2017-03-15
申请号：KR1020150185989
申请日：2015-12-24
Applicant: 서울대학교산학협력단
Abstract: 본발명은네트워크운영을제어하는주 통신기기(access point; 이하 AP), 자신의자녀기기를수용할수 있는기기인라우터(router), 자신의자녀기기를수용할수 없는기기인종단기기(end device)들이부모-자녀기기관계로연결되는클러스터트리(cluster-tree) 구조의무선통신네트워크에서부모기기와자녀기기간 링크손상(link breakdown)이발생한경우이를복구하는자가망 치료(network self-healing) 방법에관한것이다. 본발명은라우터가고아(orphan)가될 경우자신의자녀기기들과부모-자녀기기관계를유지하면서클러스터그룹단위로네트워크에재가입함으로써자가망 치료에필요한시간, 에너지, 신호교환부담을크게감소시킨다.
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公开(公告)号：KR101656527B1
公开(公告)日：2016-09-23
申请号：KR1020100011210
申请日：2010-02-05
Applicant: 삼성전자주식회사 , 서울대학교산학협력단
CPC classification number: H04L5/0048 , H04B7/024 , H04L5/0007 , H04L5/0023 , H04L5/0035 , H04L5/0073
Abstract: 본발명은통신시스템에서, 수신장치가기준신호(reference signal)를수신하는방법은송신장치로적어도하나의파라미터를송신하는과정과, 상기송신장치를위해지정된부채널집합의부채널을통해상기송신장치로부터기준신호를수신하는과정을포함하며, 여기서, 상기적어도하나의파라미터는주파수상관도를고려한부채널의할당을위해결정되며, 다수의송신장치에서상기송신장치를구별(identify)하기위한송신장치인덱스를포함하고, 상기송신장치인덱스는상기부채널집합을지정함을특징으로한다.
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公开(公告)号：KR1020140038613A
公开(公告)日：2014-03-31
申请号：KR1020120104873
申请日：2012-09-21
Applicant: 서울대학교산학협력단
Abstract: The present invention relates to a method of transmitting a synchronization signal by a main communication device in a wireless communication system including the main communication device for periodically transmitting a synchronization signal, and a plurality of terminal communication devices for transmitting and receiving a signal in synchronization with the main communication device using the synchronization signal. According to the present invention, the main communication device recognizes channel characteristics of the terminal communication devices in a system, and determines the number of repeated transmissions and the interval of transmissions according to the recognized channel information and a target transmission performance of the system to repeatedly transmit a synchronization signal when the next synchronization signal is transmitted, so that performance degradation due to a failure in reception of a synchronization signal and consumption of power can be significantly reduced by improving a synchronization signal reception performance of the terminal communication device. [Reference numerals] (301) Recognize channel characteristics of terminal communication devices in system (Cooperative/non-cooperative method); (302) Determine the number of transmissions of synchronization signal/interval of transmissions; (303) Repeatedly transmit and receive synchronization signal; (AA) Coordinator; (BB) Terminal communication device
Abstract translation: 本发明涉及一种在包括用于周期性地发送同步信号的主通信设备的无线通信系统中通过主通信设备发送同步信号的方法，以及用于同步发送和接收信号的多个终端通信设备 主要通信设备使用同步信号。 根据本发明，主通信设备识别系统中的终端通信设备的信道特性，并且根据识别的信道信息和系统的目标传输性能重复地确定重复传输的次数和传输间隔 在发送下一个同步信号时发送同步信号，从而通过提高终端通信装置的同步信号接收性能，可以显着地减少由于接收同步信号而导致的性能下降和功率消耗。 （301）识别系统中终端通信装置的信道特性（协作/非协作方式）; （302）确定同步信号/传输间隔的传输次数; （303）重复发送和接收同步信号; （AA）协调员; （BB）终端通讯装置
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公开(公告)号：KR1020130023186A
公开(公告)日：2013-03-07
申请号：KR1020120133266
申请日：2012-11-22
Applicant: 서울대학교산학협력단
IPC: H04L12/28
Abstract: PURPOSE: A self-composition system of a wireless sensor network and a self-composition method thereof are provided to connect all devices while minimizing a routing delay. CONSTITUTION: A parent device(200) receives a subscription request from a child device(300) of a lower hierarchical tree stage. The parent device selects the child device to subscribe to the parent device. The parent device allocates an address to the child device subscribing to the parent device. The child device selects the parent device of an upper hierarchical tree stage. The child device performs the subscription request. The child device subscribes according to the selection of the parent device to receive the address. [Reference numerals] (200) Parent device; (210) Child router selecting unit; (220) Multi-step tree based address assignment unit; (230) Child terminal device selecting unit; (300a) Sensor device which wants to join through a router; (300b) Sensor device which wants to join through a terminal device; (310a) Parent selecting unit for routers; (310b) Parent selecting unit for terminal devices; (AA,BB) Admission request; (CC) Router address; (DD) Terminal device address
Abstract translation: 目的：提供无线传感器网络的自组合系统及其自组合方法，以连接所有设备，同时最小化路由延迟。 构成：父设备（200）从较低等级树阶段的子设备（300）接收订阅请求。 父设备选择子设备订阅父设备。 父设备为订阅父设备的子设备分配地址。 子设备选择上层树状阶段的父设备。 子设备执行订阅请求。 子设备根据父设备的选择来接收地址。 （附图标记）（200）母装置; （210）子路由器选择单元; （220）基于多步树的地址分配单元; （230）子终端设备选择单元; （300a）希望通过路由器加入的传感器设备; （300b）希望通过终端装置加入的传感器装置; （310a）路由器的父选择单元; （310b）终端设备的父选择单元; （AA，BB）入学要求; （CC）路由器地址; （DD）终端设备地址
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