Patents by Inventor Yang-Seok Choi

Yang-Seok 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).

  • Transmission of preamble code for mobile WiMAX systems
    Patent number: 8351322
    Abstract: Embodiments of an apparatus and methods for transmission of timing and synchronization information for mobile WiMAX systems are generally described herein. Other embodiments may be described and claimed.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: January 8, 2013
    Assignee: Intel Corporation
    Inventors: Yang-Seok Choi, Ahmed Ibrahim, Jiacheng Wang
  • METHOD AND APPARATUS FOR INTERFERENCE MITIGATION IN WIRELESS SYSTEMS
    Publication number: 20130005376
    Abstract: A method is disclosed to eliminate inter-cluster interference of user equipment located at the edge of a cluster of cells. The method operates by employing fractional frequency reuse (FFR) principles on clusters or combinations of cells in a wireless neighborhood, in which base stations in the cells coordinate their operations in a scheme known as coordinated multi-point transmission (CoMP). By using the FFR principles to single out edge users of the CoMP cluster, the method mitigates interference and increases throughput for the edge users.
    Type: Application
    Filed: June 30, 2011
    Publication date: January 3, 2013
    Applicant: Intel Corporation
    Inventors: HOOMAN SHIRANI-MEHR, Yang-Seok Choi, Hujun Yin
  • Link performance abstraction for ML receivers based on RBIR metrics
    Patent number: 8347152
    Abstract: A PHY abstraction mapping between the link level and system level performance is presented based on mapping between the mean RBIR (Received Bit Information Rate) of the transmitted symbols and their received LLR values after symbol-level ML detection in SISO/MIMO wireless systems, such as WiMAX. In MIMO antenna configuration, the mapping is presented for both vertical and horizontal encoding. An embodiment of this invention provides the PER/BLER prediction in the actual system, enabling the system to use more aggressive methods to improve the system performance.
    Type: Grant
    Filed: September 10, 2008
    Date of Patent: January 1, 2013
    Assignee: Intel Corporation
    Inventors: Hongming Zheng, Wu May, Yang-seok Choi, Senjie Zhang
  • Techniques to control uplink power
    Patent number: 8340593
    Abstract: Techniques are described that provide uplink power control techniques that can support different uplink multi-input multi-output (MIMO) transmission schemes. Open and closed loop power control schemes can be used to prescribe the power level of the mobile station.
    Type: Grant
    Filed: November 10, 2009
    Date of Patent: December 25, 2012
    Assignee: Intel Corporation
    Inventors: Rongzhen Yang, Apostolos Papathanassiou, Hujun Yin, Yang-seok Choi, Wei Guan
  • Channel quality indexing and reverse indexing
    Patent number: 8315183
    Abstract: Channel quality indexing and reverse indexing is described. In one example, a quality value for subbands of a radio communications system are measured. An index for each quality measurement is then determined and a combinatorial index is generated to reflect the indices and the selected subbands. The combinatorial index is then sent to a radio station using a radio communications channel.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: November 20, 2012
    Assignee: Intel Corporation
    Inventors: Rongzhen Yang, Huaning Niu, Shi Liu, Yang-Seok Choi
  • Virtual multicarrier design for orthogonal frequency division multiple access communications
    Patent number: 8295373
    Abstract: Embodiments of the present invention provide a virtual multicarrier design for orthogonal frequency division multiple access communications. Other embodiments may be described and claimed.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: October 23, 2012
    Assignee: Intel Corporation
    Inventors: Hujun Yin, Rongzhen Yang, Xiaoshu Qian, Yang-Seok Choi, Sassan Ahmadi, Kamran Etemad
  • Complementary beamforming methods and apparatuses
    Patent number: 8195242
    Abstract: Improved methods and apparatuses are provided to address a potential “hidden beam problem” in wireless communication systems employing smart antennas. The improved methods and apparatuses utilize complementary beamforming (CBF) techniques, such as, for example, Subspace Complementary Beamforming (SCBF), Complementary Superposition Beamforming (CSBF) and/or Single Beam Complementary Beamforming (SBCBF) techniques.
    Type: Grant
    Filed: April 12, 2011
    Date of Patent: June 5, 2012
    Assignee: XR Communications, LLC
    Inventors: Vahid Tarokh, Yang-Seok Choi, Siavash Alamouti
  • MIMO symbol decoder and method for decoding spatially multiplexed symbols using combined linear equalization and maximum likelihood decoding
    Patent number: 8194798
    Abstract: Embodiments of MIMO symbol decoders and methods for decoding spatially multiplexed symbols using combined linear equalization decoding and maximum likelihood decoding are generally described herein. In some embodiments, one group of symbols (y) received through two or more spatial channels is decoded using a linear equalization decoding technique and another group of symbols is decoded using a maximum likelihood decoding (MLD) technique to generate a soft-bit output. The symbols may be grouped for either linear equalization decoding or MLD based on channel orthogonality or signal-to-interference and noise ratios (SINRs).
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: June 5, 2012
    Assignee: Intel Corporation
    Inventors: Jiacheng Wang, Hujun Yin, Yang-Seok Choi, Liang Jiang
  • OFDMA contention-based random access channel design for mobile wireless systems
    Patent number: 8094616
    Abstract: Short spreading is used within a random access channel in an OFDM based network to spread data for transmission through the channel. The resource allocation of the random access channel is divided into a number of resource blocks in frequency, time, or both frequency and time. Each resource block has a dimension that is only a portion of the overall size of the resource allocation. During contention, a randomly selected short spreading code may be used to provide data spreading within a randomly selected resource block.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: January 10, 2012
    Assignee: Intel Corporation
    Inventors: Yang-seok Choi, Muthaiah Venkatachalam, Xiangying Yang, Apostolos Papathanassiou
  • Complementary Beamforming Methods and Apparatuses
    Publication number: 20110299460
    Abstract: Improved methods and apparatuses are provided to address a potential “hidden beam problem” in wireless communication systems employing smart antennas. The improved methods and apparatuses utilize complementary beamforming (CBF) techniques, such as, for example, Subspace Complementary Beamforming (SCBF), Complementary Superposition Beamforming (CSBF) and/or Single Beam Complementary Beamforming (SBCBF) techniques.
    Type: Application
    Filed: April 12, 2011
    Publication date: December 8, 2011
    Inventors: Vahid Tarokh, Yang-Seok Choi, Siavash Alamouti
  • Method and scheme for space-time coded cochannel interference cancellation
    Patent number: 8064532
    Abstract: An apparatus, system, and method for space-time cochannel interference cancellation are described. The apparatus may include a time stacking module to stack consecutive subcarrier signals for a period of time equal to several symbols and a space-time subcarrier beamformer module to perform space-time subcarrier beamforming by applying space-time beamformer weights to stacked symbols on one or more subcarriers. The space-time beamformer weights may be calculated based on spatial and time correlation properties of one or more interference signals. Other embodiments are described and claimed.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: November 22, 2011
    Inventors: Alexander Alexandrovich Maltsev, Alexey Vladimirovich Khoryaev, Roman Olegovich Maslennikov, Vladimir Alexandrovich Pestretsov, Quinghua Li, Yang-Seok Choi
  • TECHNIQUES USING DIFFERENTIAL PRECODING FOR HIGHLY CORRELATED CHANNELS IN WIRELESS NETWORKS
    Publication number: 20110249655
    Abstract: An embodiment of the present invention provides a method of using differential precoding for highly correlated channels in a wireless network, comprising, using a differential codebook optimized for highly correlated antennas.
    Type: Application
    Filed: April 9, 2010
    Publication date: October 13, 2011
    Inventors: Xiaogang Chen, Yuan Zhu, Qinghua Li, Xintian E. Lin, Yang-Seok Choi
  • CHANNEL QUALITY INDEXING AND REVERSE INDEXING
    Publication number: 20110149758
    Abstract: Channel quality indexing and reverse indexing is described. In one example, a quality value for subbands of a radio communications system are measured. An index for each quality measurement is then determined and a combinatorial index is generated to reflect the indices and the selected subbands. The combinatorial index is then sent to a radio station using a radio communications channel.
    Type: Application
    Filed: December 23, 2009
    Publication date: June 23, 2011
    Inventors: Rongzhen Yang, Huaning Niu, Shi Liu, Yang-Seok Choi
  • LOCATION DETERMINATION IN WIRELESS COMMUNICATION SYSTEMS
    Publication number: 20110110338
    Abstract: Briefly, in accordance with one or more embodiments, a mobile station receives a location beacon transmitted from multiple base stations based on a transmission plan for a predefined downlink location based services zone in the superframes of a signal frame structure. The transmission plan includes spreading transmissions of the location beacon that are unique to respective base stations. The mobile station identifies the base stations based on the respective location beacons and the transmission plan. The mobile station identifies a present location based on the location beacons and the identities of the base stations that from which the location beacons were received.
    Type: Application
    Filed: July 27, 2010
    Publication date: May 12, 2011
    Inventors: Alexey Khoryaev, Alexander Maltsev, Kamran Etemad, Roman O. Maslennikov, Mikhail A. Shilov, Yang-Seok Choi, Andrey Chervyakov
  • Techniques to control uplink power
    Publication number: 20110111766
    Abstract: Techniques are described that provide uplink power control techniques that can support different uplink multi-input multi-output (MIMO) transmission schemes. Open and closed loop power control schemes can be used to prescribe the power level of the mobile station.
    Type: Application
    Filed: November 10, 2009
    Publication date: May 12, 2011
    Inventors: Rongzhen Yang, Apostolos Papathanassiou, Hujun Yin, Yang-seok Choi, Wei Guan
  • Subcarrier permutation to achieve high frequency diversity of OFDMA systems
    Publication number: 20110110342
    Abstract: An embodiment of the present invention provides a method of improving subcarrier permutation to achieve high frequency diversity of OFDMA systems in wireless networks, comprising introducing different tone selections for different symbols, such that if a channel has only a few tones in each symbol of a resource unit it can still have sufficient frequency diversity.
    Type: Application
    Filed: March 9, 2010
    Publication date: May 12, 2011
    Inventors: Yi Hsuan, Yang-Seok Choi, Hujun Yin
  • Complementary beamforming methods and apparatuses
    Patent number: 7925303
    Abstract: Improved methods and apparatuses are provided to address a potential “hidden beam problem” in wireless communication systems employing smart antennas. The improved methods and apparatuses utilize complementary beamforming (CBF) techniques, such as, for example, Subspace Complementary Beamforming (SCBF), Complementary Superposition Beamforming (CSBF) and/or Single Beam Complementary Beamforming (SBCBF) techniques.
    Type: Grant
    Filed: May 12, 2006
    Date of Patent: April 12, 2011
    Assignee: XR Communications, LLC
    Inventors: Vahid Tarokh, Yang-Seok Choi, Siavash Alamouti
  • Wireless communications mode switching apparatus and methods
    Patent number: 7894382
    Abstract: Methods and apparatus are described herein to provide for wireless communications mode switching in a MIMO communications system. Other embodiments may include a method for communicating through a MIMO channel that includes choosing a communications level for each of at least two communications mode, and calculating the spectral efficiency for the chosen communications level. The method may further include comparing the spectral efficiencies and choosing a communications mode and communications level based on the comparison. Further embodiments may include a communications apparatus that includes a transceiver, a capacity calculator and a selecting module. Other embodiments are described and claimed.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: February 22, 2011
    Assignee: Intel Corporation
    Inventors: Yang-Seok Choi, Siavash M. Alamouti
  • Method of Selecting Receive Antennas for MIMO Systems
    Publication number: 20110038439
    Abstract: A method of performing receive antenna selection is presented. The method executes a determination operation for a set of receive antennas, determines a maximum result of the determination operation for two of the antennas, eliminates one of the two antennas from the set of antennas, and repeats the determination and elimination process until only a predetermined number of antennas remain in the set. The signals from these remaining antennas are then processed. The present invention reduces receiver complexity and cost.
    Type: Application
    Filed: October 26, 2010
    Publication date: February 17, 2011
    Applicant: AT&T INTELLECTUAL PROPERTY II, L.P.
    Inventors: Jack Harriman Winters, Yang-Seok Choi, Byoung-Jo J. Kim, Andreas Molisch, Moe Z. Win, Hui Lo
  • Systems and methods for channel coding of wireless communication
    Publication number: 20110004804
    Abstract: Embodiments of an apparatus and method for coding of wireless transmissions channel are generally described herein. Other embodiments may be described and claimed.
    Type: Application
    Filed: December 24, 2009
    Publication date: January 6, 2011
    Inventors: Changlong Xu, Tom Harel, Huaning Niu, Jong-Kae Fwu, Yang-Seok Choi, Hujun Yin