公开(公告)号：US20150111595A1

公开(公告)日：2015-04-23

申请号：US14304352

申请日：2014-06-13

Applicant: Electronics and Telecommunications Research Institute

Inventor： Sung-Jin YOO ,  Sung-Hyun HWANG ,  Jung-Sun UM ,  Byung-Jang JEONG

IPC: H04W16/14 ,  H04W72/04

CPC classification number: H04W16/14 ,  H04L27/0006 ,  H04W72/04

Abstract: Provided are a method of scheduling spectrum sensing and a method of allocation uplink radio resource in a cognitive radio communication system. The method of scheduling spectrum sensing in a cognitive radio communication system includes classifying terminals in a cell into terminals affecting spectrum sensing and terminals not affecting spectrum sensing, and performing spectrum sensing when it is determined that uplink signals of other terminals do not affect spectrum sensing based on results of the classification.

Abstract translation: 提供了一种在认知无线电通信系统中调度频谱感测的方法和分配上行链路无线电资源的方法。 在认知无线电通信系统中调度频谱感测的方法包括将小区中的终端分类为影响频谱感测的终端和不影响频谱感测的终端，并且当确定其他终端的上行链路信号不影响基于频谱感测时，执行频谱感测 对分类结果。

公开(公告)号：US20150188746A1

公开(公告)日：2015-07-02

申请号：US14450757

申请日：2014-08-04

Applicant: Electronics and Telecommunications Research Institute

Inventor： Jung-Sun UM ,  Sung-Hyun HWANG ,  Sung-Jin YOO, ,  Byung-Jang JEONG, ,  Jae-Ick CHOI

IPC: H04L27/26 ,  H04J11/00

CPC classification number: H04L27/2663 ,  H04L27/2646 ,  H04L27/2656 ,  H04L27/266 ,  H04W48/16

Abstract: Disclosed herein are a method and a system for performing initial ranging in a cognitive radio network The method for performing initial ranging in a cognitive radio network includes: detecting signals received in one or more ranging sections; estimating a tint time offset based on a correlation between subcarrier indices of the signals detected in the one or more ranging sections; estimating a second time offset based on correlations for the signals detected in the one or more ranging sections and a plurality of codes that are predetermined and detecting an initial ranging code among the plurality of codes; and estimating a time offset of a CPE performing initial ranging with the detected initial ranging code using the first time offset and the second time offset that are estimated.

Abstract translation: 这里公开了一种用于在认知无线电网络中执行初始测距的方法和系统。用于在认知无线电网络中执行初始测距的方法包括：检测在一个或多个测距部分中接收的信号; 基于在所述一个或多个测距段中检测到的信号的子载波索引之间的相关性来估计色调时间偏移; 基于在所述一个或多个测距段中检测到的信号的相关性和预定的多个代码并检测所述多个代码中的初始测距码来估计第二时间偏移; 以及使用所估计的所述第一时间偏移和所述第二时间偏移来估计执行初始测距的CPE与所检测的初始测距码的时间偏移。

公开(公告)号：US20180138995A1

公开(公告)日：2018-05-17

申请号：US15811402

申请日：2017-11-13

Applicant: Electronics and Telecommunications Research Institute

Inventor： Kyu-Min KANG ,  Jae-Cheol PARK ,  Seung-Keun PARK ,  Sung-Jin YOO ,  Hye-Yeon KWON ,  Yun-Bae KIM ,  Igor KIM ,  Jung-Sun UM ,  Young-Hwan LEE ,  Hoi-Yoon JUNG ,  Su-Na CHOI ,  Hyung-Do CHOI ,  Sung-Hyun HWANG

IPC: H04B17/345 ,  H04B3/46

CPC classification number: H04B17/345 ,  H04B3/46 ,  H04B17/14

Abstract: Disclosed herein are an apparatus and method for measuring a broadband Passive Intermodulation Distortion (PIMD) signal. The apparatus for measuring a broadband PIMD signal includes a Radio Frequency (RF) processing unit for combining one or more transmission signals into a single output signal and transmitting the output signal to a feeder so as to measure a PIMD signal and for generating a beat frequency signal using the PIMD signal received from the feeder, and a digital processing unit for transferring a control signal required so as to control the RF processing unit, receiving the beat frequency signal, and then measuring a location of a passive element in the feeder in which the PIMD signal has been generated by performing digital signal processing on the beat frequency signal.

公开(公告)号：US20150092871A1

公开(公告)日：2015-04-02

申请号：US14311579

申请日：2014-06-23

Applicant: Electronics and Telecommunications Research Institute

Inventor： Sung-Hyun HWANG ,  Jung-Sun UM ,  Sung-Jin YOO ,  Byung-Jang JEONG ,  Myung-Sun SONG

IPC: H04L25/02

CPC classification number: H04L25/0204 ,  H04L25/022 ,  H04L25/0232

Abstract: Disclosed herein are an apparatus and a method of estimating a channel in consideration of a residual synchronization offset. The apparatus of estimating a channel in consideration of a residual synchronization offset includes: a channel estimating unit estimating the channel using pilots scattered over a plurality of OFDM symbols and calculating a first channel estimated value as the estimation result, in the case in which an OFDM symbol estimating the channel and an OFDM symbol compensating for the channel are different from each other; and a phase reflecting unit calculating a phase generated by the residual synchronization offset in proportion to a difference between a channel estimation time and a channel compensation time, reflecting the calculated phase in the first channel estimated value, and calculating a second channel estimated value as the reflection result.

Abstract translation: 本文公开了考虑到残余同步偏移来估计信道的装置和方法。 考虑到残余同步偏移来估计信道的装置包括：信道估计单元，其使用在多个OFDM符号上分散的导频并计算第一信道估计值作为估计结果来估计信道，其中OFDM 估计信道的符号和补偿信道的OFDM符号彼此不同; 以及相位反映部，其将所述残差同步偏移产生的相位与信道估计时间和信道补偿时间之间的差成比例地计算，反映所述计算出的所述第一信道估计值的相位，并计算第二信道估计值为 反思结果。

公开(公告)号：US20140376493A1

公开(公告)日：2014-12-25

申请号：US14478366

申请日：2014-09-05

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Sung-Hyun HWANG ,  Chang-Joo KIM ,  Myung-Sun SONG ,  Jung-Sun UM

IPC: H04W72/04

CPC classification number: H04W72/0406 ,  H04L5/0007 ,  H04L5/0048

Abstract: 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.

Abstract translation: 提供了一种生成能够执行自适应信道估计的导频模式的方法，以及基站的方法和装置以及使用导频模式的终端的方法和装置。 导频模式基于从先前的正交频分多址（OFDMA）符号的导频到频域和时域中的当前OFDMA符号的子载波位置的距离来选择导频符号位置，从而保持低导频密度 为了有效地发送数据，即使在恶劣的信道环境中也可以获得稳定的信道估计性能。 另外，根据基站和终端之间的信道环境确定最小突发分配大小，保证适合信道环境的信道估计性能，提高粒度，信道估计延迟和信道估计存储器大小。