Patents by Inventor In Kyeong Choi
In Kyeong Choi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20170117200Abstract: A semiconductor package and a manufacturing method thereof, which can reduce the size of the semiconductor package and improve product reliability. In a non-limiting example embodiment, the method may comprise forming an interposer on a wafer, forming at least one reinforcement member on the interposer, coupling and electrically connecting at least one semiconductor die to the interposer to the interposer, filling a region between the semiconductor die and the interposer with an underfill, and encapsulating the reinforcement member, the semiconductor die and the underfill on the interposer using an encapsulant.Type: ApplicationFiled: May 6, 2016Publication date: April 27, 2017Inventors: Young Rae Kim, Won Chul Do, Ji Hun Lee, Min Hwa Chang, Dong Hyun Kim, Wang Gu Lee, Jin Ryang Hwang, Mi Kyeong Choi
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Patent number: 9042473Abstract: Disclosed is an apparatus for receiving data in a communication system, including: a receiving unit configured to receive data transmitted from an access point (AP) by a multi-input multi-output (MIMO) scheme; a detecting unit configured to detect a data stream of the received data using an LQ decomposition scheme; a generating unit configured to generate channel information regarding the data stream; and a transmitting unit configured to feedback the channel information to the AP.Type: GrantFiled: February 10, 2012Date of Patent: May 26, 2015Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Jong-Ee Oh, Hee-Jung Yu, Yu-Ro Lee, In-Kyeong Choi, Sok-Kyu Lee
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Patent number: 8891643Abstract: A method and apparatus for allocating transmission power in a transmission terminal having at least one antenna of a multi-input multi-output (MIMO) system are provided. The method includes: measuring inter-stream interference of a plurality of streams; measuring inter-user interference of a plurality of users; and determining the transmission power based on the inter-stream interference and the inter-user interference, wherein the transmission power is determined using an iterative water-filling algorithm in which the Karush-Kuhn-Tucker (KKT) system is iteratively applied to all of the plurality of streams and all of the plurality of users. According to the present invention, several receive antennas are mounted in the MIMO system, thereby making it possible to receive multiple streams. In addition, when the multiple streams are received, transmission power may be allocated to each transmission stream.Type: GrantFiled: September 14, 2012Date of Patent: November 18, 2014Assignee: Electronics and Telecommunication Research InstituteInventors: In Kyeong Choi, Sok Kyu Lee
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Patent number: 8761061Abstract: Disclosed is an apparatus for transmitting data in a communication system, including: a receiving unit configured to receive signals from multi-users by a multi-user-multi input multi output (MIMO) scheme and acquire channel information from the users; a calculation unit configured to calculate precoding vectors for the users using the channel information; a precoding unit configured to precode data of the users using the precoding vectors; and a transmitting unit configured to transmit the precoded data to users by the multi user-MIMO scheme.Type: GrantFiled: December 23, 2011Date of Patent: June 24, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: In-Kyeong Choi, Sok-Kyu Lee
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Patent number: 8718191Abstract: A method for transmitting, by a transmitting terminal, data to a receiving terminal in a wireless communication system includes: generating a first detection field including symbols modulated by using a BPSK data tone; generating a second detection field including symbols modulated such that an even numbered subcarrier and an odd numbered subcarrier have a phase difference of 90 degrees; generating a data packet including the first detection field, the second detection field, and the data; and transmitting the data packet.Type: GrantFiled: February 23, 2011Date of Patent: May 6, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: Il-Gu Lee, In-Kyeong Choi, Yu-Ro Lee, Jong-Ee Oh, Eun-Young Choi, Sok-Kyu Lee
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Patent number: 8687509Abstract: The present invention relates to a method for random beam-forming based on a codebook. The method includes generating a first random variable corresponding to a Gaussian distribution; generating a second random variable corresponding to a uniform distribution; generating a plurality of beam elements by using the first variable, the second variable, spatial correlation between channels, and indexes of transmitting antennas; and forming a beam by using the plurality of beam elements.Type: GrantFiled: August 29, 2008Date of Patent: April 1, 2014Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research InstituteInventors: In-Kyeong Choi, Dong Seung Kwon, Ji Won Kang, Chung Yong Lee
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Publication number: 20130266054Abstract: A method and apparatus for allocating transmission power in a transmission terminal having at least one antenna of a multi-input multi-output (MIMO) system are provided. The method includes: measuring inter-stream interference of a plurality of streams; measuring inter-user interference of a plurality of users; and determining the transmission power based on the inter-stream interference and the inter-user interference, wherein the transmission power is determined using an iterative water-filling algorithm in which the Karush-Kuhn-Tucker (KKT) system is iteratively applied to all of the plurality of streams and all of the plurality of users. According to the present invention, several receive antennas are mounted in the MIMO system, thereby making it possible to receive multiple streams. In addition, when the multiple streams are received, transmission power may be allocated to each transmission stream.Type: ApplicationFiled: September 14, 2012Publication date: October 10, 2013Applicant: Electronics and Telecommunications Research InstituteInventors: In Kyeong CHOI, Sok Kyu LEE
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Patent number: 8509336Abstract: Disclosed is a transmitting/receiving method in a multi-user multiple-input multiple-output (MU-MIMO) channel. The transmitting method includes: performing QR decomposition on a Hermitian transpose matrix of a channel matrix to obtain a first matrix and a second matrix as a triangular matrix; obtaining a preprocessing matrix by using the first matrix; and forming an effective channel based on the preprocessing matrix by a block triangulation technique.Type: GrantFiled: June 24, 2008Date of Patent: August 13, 2013Assignees: Samsung Electronics Co., Ltd., Electronics & Telecommunications Research InstituteInventors: Choong il Yeh, In-Kyeong Choi, Young Seog Song, Seung Joon Lee, Byung-Jae Kwak, Ji Hyung Kim, Dong Seung Kwon, Joon Doo Kim, Ji Won Kang, Chung Yong Lee
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Patent number: 8422449Abstract: A MU-MIMO method of an access point in a WLAN using multi-channels and having at least one station includes: receiving index information indicating a precoding vector for a beam selected by the station and channel quality information thereof for each one of the multi-channels; generating first channel capacity information of channel combination groups using the channel quality information wherein the channel combination groups are grouped according to a predetermined channel bandwidth of the multi-channels; and allocating resources to the station from a channel combination selected from the channel combination groups according to the first channel capacity information using the index information and the channel quality information, wherein the access point and the station previously store precoding vector information for a plurality of beams for the MU-MIMO.Type: GrantFiled: October 22, 2010Date of Patent: April 16, 2013Assignee: Electronics and Telecommunications Research InstituteInventor: In-Kyeong Choi
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Patent number: 8331255Abstract: The present invention relates to a beamforming method and apparatus. A beamforming method for use in a base station for transmitting a plurality of streams through a plurality of antennas includes: receiving feedback information including information on a first codeword selected from a codebook including a plurality of codewords from each of a plurality of user terminals; grouping the plurality of user terminals by use of the feedback information from each user terminal; determining a user terminal to which a plurality of streams will be assigned of the plurality of user terminals, and determining a second codeword to be used for beamforming from the codebook by use of the feedback information of each user terminal and grouping information; and multiplying data to be transmitted through the plurality of steams by the second codeword and a unitary matrix.Type: GrantFiled: September 11, 2008Date of Patent: December 11, 2012Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research InstituteInventors: In-Kyeong Choi, Dong Seung Kwon, Ji Won Kang, Chung Yong Lee
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Publication number: 20120207236Abstract: Disclosed is an apparatus for receiving data in a communication system, including: a receiving unit configured to receive data transmitted from an access point (AP) by a multi-input multi-output (MIMO) scheme; a detecting unit configured to detect a data stream of the received data using an LQ decomposition scheme; a generating unit configured to generate channel information regarding the data stream; and a transmitting unit configured to feedback the channel information to the AP.Type: ApplicationFiled: February 10, 2012Publication date: August 16, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Jong-Ee Oh, Hee-Jung Yu, Yu-Ro Lee, In-Kyeong Choi, Sok-Kyu Lee
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Patent number: 8243707Abstract: The present invention relates to a method of forming a random beam, and a beam forming apparatus. A quantization preprocessor and a random unitary matrix having a predetermined pattern are used to form a beam on a mobile terminal. A base station forms a beam using a codeword index of a quantization codebook received from a mobile terminal and channel quality information corresponding to the codeword index, and the mobile terminal generates the codeword index and the channel quality information using pilot signals generated by the base station. The number of pilot signals is equal to the number of transmitting antennas. Therefore, a codebook that has been known to both the mobile terminal and the base station is used, and the mobile terminal can select the codeword index for quantization, which makes it possible to selectively give diversity and thus improve the system efficiency.Type: GrantFiled: October 10, 2007Date of Patent: August 14, 2012Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research InstituteInventors: In-Kyeong Choi, Dong-Seung Kwon, Choong-Il Yeh, Ji-Won Kang, Chung-Yong Lee
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Publication number: 20120163258Abstract: Disclosed is an apparatus for transmitting data in a communication system, including: a receiving unit configured to receive signals from multi-users by a multi-user-multi input multi output (MIMO) scheme and acquire channel information from the users; a calculation unit configured to calculate precoding vectors for the users using the channel information; a precoding unit configured to precode data of the users using the precoding vectors; and a transmitting unit configured to transmit the precoded data to users by the multi user-MIMO scheme.Type: ApplicationFiled: December 23, 2011Publication date: June 28, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: In-Kyeong CHOI, Sok-Kyu Lee
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Patent number: 8199848Abstract: The present invention relates to a precoder and a precoding method in a multi-user multi-antenna communication System. When a transmission part (100) having a plurality of antennas transmits a plurality of signals to a receiving part (200) having an antenna, the precoder and the precoding method using the same prevents System performance degradation caused by interference signals and efficiently reduces transmission power while changing the constellation rotary angle. When the power is controlled by using the precoder, the System performance is enhanced while not damaging the structural gain of the existing multi-user multi-antenna precoder.Type: GrantFiled: May 15, 2007Date of Patent: June 12, 2012Assignees: Electoronics and Telecommunications Research Institute, Samsung Electornics Co., Ltd.Inventors: Dong-Seung Kwon, In-Kyeong Choi, Hyong-Woo Ku, Ji-Won Kang, Chung-Yong Lee
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Patent number: 8121208Abstract: The present invention relates to a multi-input multi-output (MIMO) system for enhancing transmission performance. The MIMO system uses space-time encoding and transmit antenna selection methods, and includes a transmitter (100) and a receiver (200). The transmitter (100) includes N transmit antennas (130-1, 130-4) that are more than M transmit antennas (130-1, 130-3) used for transmitting a signal to space channel, selects the M transmit antennas (130-1, 130-3) among the N transmit antennas (130-3 130-4), and transmits symbol by space-time encoding the symbol. The receiver (200) includes M receive antenna (120-1, 210-2) for receiving a signal from the space channel, detects an information symbol by using the signal received through the receive antenna (210-1, 210-2), generates transmit antenna selection information for selecting M transmit antennas (130-1, 130-3) among transmit antennas (i30-1, . . . 7130-4) with reference to a channel estimate, and returns the information to the transmitter.Type: GrantFiled: August 10, 2005Date of Patent: February 21, 2012Assignees: Electronics and Telecommunications Research Institute, Industry-Academic Cooperation Foundation, Yonsei UniversityInventors: Young-Seog Song, Seong-Rag Kim, In-Kyeong Choi, Choong-Il Yeh, Seung-Joon Lee, Hyoung-Soo Lim, Kwang-Jae Lim, Yu-Ro Lee, Jong-Ee Oh, Dong-Seung Kwon, Seung-Ku Hwang, Chung-Yong Lee, Myeong-Cheol Shin
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Patent number: 8107514Abstract: A receiver according to an exemplary embodiment of the present invention receives a transmitted signal, converts the signal to a predetermined symbol, and estimates channel information including a channel gain of a channel of the transmitted signal. In addition, the receiver generates an intermediate processing value for decoding the signal based on the estimated channel information and the symbol, and normalizes the intermediate processing value to the channel gain to generate a reference value. The generated reference value is used for a soft-decision value for decoding the signal. In addition, when the signal is decoded by using a hard-decision value, a constellation point value that is closest to the reference values is generated and set as the hard-decision value.Type: GrantFiled: December 9, 2005Date of Patent: January 31, 2012Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute, KT Corporation, SK Telecom Co., Ltd, KTFreetel Co., Ltd., Hanaro Telecom, Inc.Inventors: Seung-Joon Lee, Dong-Seung Kwon, Seong-Rag Kim, In-Kyeong Choi
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Patent number: 8077792Abstract: In a method for allocating transmission power in a communication system including multiple antennas, a plurality of subcarriers are grouped by a plurality of groups, and each group includes at least one subcarrier. A transmission power weight and an antenna transmission vector are calculated for each group by using channel information, a transmission power for each group of each antenna is calculated by using the transmission power weight and the antenna transmission vector for each group, and transmission signals are transmitted through the multiple antennas after determining which signals need to be transmitted from the multiple antennas by using the transmission power.Type: GrantFiled: December 11, 2006Date of Patent: December 13, 2011Assignees: Samsung Electronics Co., Ltd, Electronics and Telecommunications Research Institute, KT Corporation, SK Telecom Co., Ltd, Hanaro Telecom, Inc.Inventors: Yu-Ro Lee, In-Kyeong Choi, Dong-Seung Kwon
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Publication number: 20110206156Abstract: A method for transmitting, by a transmitting terminal, data to a receiving terminal in a wireless communication system includes: generating a first detection field including symbols modulated by using a BPSK data tone; generating a second detection field including symbols modulated such that an even numbered subcarrier and an odd numbered subcarrier have a phase difference of 90 degrees; generating a data packet including the first detection field, the second detection field, and the data; and transmitting the data packet.Type: ApplicationFiled: February 23, 2011Publication date: August 25, 2011Applicant: Electronics and Telecommunications Research InstituteInventors: Il-Gu LEE, In-Kyeong CHOI, Yu-Ro LEE, Jong-Ee OH, Eun-Young CHOI, Sok-Kyu LEE
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Publication number: 20110122782Abstract: The present invention relates to a method for random beam-forming based on a codebook. The method includes generating a first random variable corresponding to a Gaussian distribution; generating a second random variable corresponding to a uniform distribution; generating a plurality of beam elements by using the first variable, the second variable, spatial correlation between channels, and indexes of transmitting antennas; and forming a beam by using the plurality of beam elements.Type: ApplicationFiled: August 29, 2008Publication date: May 26, 2011Applicants: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTIT, SAMSUNG ELECTRONICS CO., LTD.Inventors: In-Kyeong Choi, Dong Seung Kwon, Ji Won Kang, Chung Yong Lee
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Publication number: 20110096738Abstract: A MU-MIMO method of an access point in a WLAN using multi-channels and having at least one station includes: receiving index information indicating a precoding vector for a beam selected by the station and channel quality information thereof for each one of the multi-channels; generating first channel capacity information of channel combination groups using the channel quality information wherein the channel combination groups are grouped according to a predetermined channel bandwidth of the multi-channels; and allocating resources to the station from a channel combination selected from the channel combination groups according to the first channel capacity information using the index information and the channel quality information, wherein the access point and the station previously store precoding vector information for a plurality of beams for the MU-MIMO.Type: ApplicationFiled: October 22, 2010Publication date: April 28, 2011Applicant: Electronics and Telecommunications Research InstituteInventor: In-Kyeong CHOI