Patents by Inventor Shang-Ho Tsai

Shang-Ho Tsai 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).

  • Publication number: 20220224378
    Abstract: A method for downlink transmission in a cloud radio access network for a number of users is applied in a central unit. The central unit determines a specific number of remote radio heads (RRHs) as non-serving RRHs based on a predetermined data compression ratio. For each of many pieces of user equipment (UEs), the central unit determines a combination of RRHs which are non-serving in coordinated multi-point transmission (CoMP) from a plurality of RRHs based on the determined specific number, and then performs CoMP downlink transmission based on the combination of RRHs which are non-serving in the CoMP.
    Type: Application
    Filed: April 1, 2022
    Publication date: July 14, 2022
    Inventors: TZU-YU LIN, SHANG-HO TSAI, YU-HENG YOU, HSIN-HUNG CHOU, WEI-HAN HSIAO
  • Publication number: 20220149905
    Abstract: A method and a system for processing uplink signals in cloud radio access networks are disclosed The system comprising a baseband unit and a number of remote radio heads. The baseband unit and the remote radio heads are connected through fronthaul links. When one remote radio head receives a signal transmitted from a user equipment, the remote radio head first encodes the received signal according to a post-coding matrix, then quantizes the encoded signal according to a number of quantization bits allocated to the user equipment, and finally transmits the quantized signal to the baseband unit.
    Type: Application
    Filed: November 4, 2021
    Publication date: May 12, 2022
    Inventors: XIANG-QUAN SER, CHI-CHEN WANG, SHANG-HO TSAI, HSIN-HUNG CHOU, WEI-HAN HSIAO
  • Patent number: 11329700
    Abstract: A method for downlink transmission in a cloud radio access network for a number of users is applied in a central unit. The central unit determines a specific number of remote radio heads (RRHs) as non-serving RRHs based on a predetermined data compression ratio. For each of many pieces of user equipment (UEs), the central unit determines a combination of RRHs which are non-serving in coordinated multi-point transmission (CoMP) from a plurality of RRHs based on the determined specific number, and then performs CoMP downlink transmission based on the combination of RRHs which are non-serving in the CoMP.
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: May 10, 2022
    Assignee: HON LIN TECHNOLOGY CO., LTD.
    Inventors: Tzu-Yu Lin, Shang-Ho Tsai, Yu-Heng You, Hsin-Hung Chou, Wei-Han Hsiao
  • Patent number: 11309952
    Abstract: A beamforming transmission device includes a baseband processing unit, at least one radio frequency unit, and an antenna array unit. The baseband processing unit provides at least one data stream and generates a control signal according to channel state information of at least two pieces of user equipment, wherein the data stream includes data of at least two pieces of user equipment. The radio frequency unit receives the data stream signal and generates at least one radio frequency signal. The antenna array unit receives the radio frequency signal and the control signal and adjusts gains and phases of the antenna array unit according to the control signal such that the radio frequency signal can be formed as a shared beamforming signal for transmitting to at least two pieces of user equipment, wherein the shared beamforming signal includes the data of at least two pieces of user equipment.
    Type: Grant
    Filed: November 25, 2020
    Date of Patent: April 19, 2022
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Shang-Ho Tsai, Yan-Yin He, Hsiao-Chien Chen
  • Publication number: 20210184753
    Abstract: A beamforming transmission device includes a baseband processing unit, at least one radio frequency unit, and an antenna array unit. The baseband processing unit provides at least one data stream and generates a control signal according to channel state information of at least two pieces of user equipment, wherein the data stream includes data of at least two pieces of user equipment. The radio frequency unit receives the data stream signal and generates at least one radio frequency signal. The antenna array unit receives the radio frequency signal and the control signal and adjusts gains and phases of the antenna array unit according to the control signal such that the radio frequency signal can be formed as a shared beamforming signal for transmitting to at least two pieces of user equipment, wherein the shared beamforming signal includes the data of at least two pieces of user equipment.
    Type: Application
    Filed: November 25, 2020
    Publication date: June 17, 2021
    Inventors: Shang-Ho TSAI, Yan-Yin HE, Hsiao-Chien CHEN
  • Publication number: 20210126675
    Abstract: A method for downlink transmission in a cloud radio access network for a number of users is applied in a central unit. The central unit determines a specific number of remote radio heads (RRHs) as non-serving RRHs based on a predetermined data compression ratio. For each of many pieces of user equipment (UEs), the central unit determines a combination of RRHs which are non-serving in coordinated multi-point transmission (CoMP) from a plurality of RRHs based on the determined specific number, and then performs CoMP downlink transmission based on the combination of RRHs which are non-serving in the CoMP.
    Type: Application
    Filed: September 25, 2020
    Publication date: April 29, 2021
    Inventors: TZU-YU LIN, SHANG-HO TSAI, YU-HENG YOU, HSIN-HUNG CHOU, WEI-HAN HSIAO
  • Patent number: 10879982
    Abstract: A beamforming transmission device includes a control unit, at least one radio frequency unit, and at least one signal transmission unit. The control unit is configured to receive a radio frequency signal and channel state information of at least two pieces of user equipment, and to generate a control signal according to the radio frequency signal and the channel state information of the at least two pieces of user equipment. The radio frequency unit is coupled to the control unit. The radio frequency unit is configured to receive the control signal and generate a beamforming signal according to the control signal. The signal transmission unit is coupled to the radio frequency unit. The signal transmission unit is configured to transmit the beamforming signal to the at least two pieces of user equipment.
    Type: Grant
    Filed: December 11, 2019
    Date of Patent: December 29, 2020
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Shang-Ho Tsai, Kuo-Chen Ho, Yi-Chen Chen
  • Patent number: 10708090
    Abstract: A millimeter wave channel estimation method comprises sending signals through a millimeter wave channel according to a first beamforming matrix, performing a channel estimation on the millimeter wave to generate a first measured matrix, and estimating and obtaining at least one angle of departure of the millimeter wave channel according to the first measured matrix and an angle compressive sensing matrix. The first beamforming matrix comprises a plurality of first beamforming vectors, and the first beamforming vectors respectively corresponds to a plurality of first beamforming patterns. The first measured matrix comprises a plurality of first measured parameters respectively corresponding to the first beamforming vectors.
    Type: Grant
    Filed: December 27, 2018
    Date of Patent: July 7, 2020
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Hsin Yuan Lo, Shang-Ho Tsai, Kuo Chen Ho
  • Publication number: 20200213162
    Abstract: A millimeter wave channel estimation method comprises sending signals through a millimeter wave channel according to a first beamforming matrix, performing a channel estimation on the millimeter wave to generate a first measured matrix, and estimating and obtaining at least one angle of departure of the millimeter wave channel according to the first measured matrix and an angle compressive sensing matrix. The first beamforming matrix comprises a plurality of first beamforming vectors, and the first beamforming vectors respectively corresponds to a plurality of first beamforming patterns. The first measured matrix comprises a plurality of first measured parameters respectively corresponding to the first beamforming vectors.
    Type: Application
    Filed: December 27, 2018
    Publication date: July 2, 2020
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Hsin Yuan LO, Shang-Ho TSAI, Kuo Chen HO
  • Patent number: 10644960
    Abstract: A calibration method for achieving channel reciprocity is provided. The method is used in a wireless communication device and includes: receiving environment information between a root node and each of a plurality of child nodes and between each of the child nodes and one of the other child nodes transmitted by the root node and the child nodes; obtaining evaluation parameters between each of the child nodes and the root node and between each of the child nodes and one of the other child nodes according to the environment information; determining links between the root node and the child nodes according to the evaluation parameters to form a first tree network topology; and obtaining calibration parameters according to the first tree network topology to calibrate reciprocity of the root node and the child nodes.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: May 5, 2020
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Che-Ying Lien, Shang-Ho Tsai
  • Patent number: 10594517
    Abstract: A channel estimation system and method thereof is provided. By utilizing the nature of the millimeter-wave channel with sparse path, the channel estimation problem is transformed from estimating the entire channel matrix to estimating independent parameters of the millimeter-wave channel. These parameters are angle of arrival (AoA) and angle of departure (AoD), and complex gain of the channel paths.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: March 17, 2020
    Assignee: WISTRON NEWEB CORPORATION
    Inventors: Hsin-Yuan Lo, Shang-Ho Tsai, Shoou-Hann Huang, Chun-Hsiung Chuang
  • Publication number: 20190132208
    Abstract: A calibration method for achieving channel reciprocity is provided. The method is used in a wireless communication device and includes: receiving environment information between a root node and each of a plurality of child nodes and between each of the child nodes and one of the other child nodes transmitted by the root node and the child nodes; obtaining evaluation parameters between each of the child nodes and the root node and between each of the child nodes and one of the other child nodes according to the environment information; determining links between the root node and the child nodes according to the evaluation parameters to form a first tree network topology; and obtaining calibration parameters according to the first tree network topology to calibrate reciprocity of the root node and the child nodes.
    Type: Application
    Filed: December 26, 2017
    Publication date: May 2, 2019
    Inventors: Che-Ying LIEN, Shang-Ho TSAI
  • Publication number: 20140181166
    Abstract: An apparatus for low complexity sub-Nyquist sampling of sparse wideband signals is provided, including a mixer, a periodic random sequence generator and a filter bank. The periodic random sequence generator generates a periodic pseudo-random sequence. The mixer is connected to the periodic random sequence generator for receiving the periodic pseudo-random sequence and mixing with an input signal to obtain a modulated signal. The filter bank further includes a plurality of filters and is connected to the mixer for filtering the modulated signal. The sub-Nyquist sampling apparatus may further includes a plurality of analog-to-digital convertors (ADCs), with each ADC connected to each filter of the filter bank to sample the signal from the filter bank and output a sampling signal.
    Type: Application
    Filed: December 26, 2012
    Publication date: June 26, 2014
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Chun-Hsiung CHUANG, Chia-Hua LIN, Shang-Ho TSAI, Kai-Jiun YANG
  • Patent number: 8442145
    Abstract: A transmitting terminal includes a signal processing unit, MS RF units, MT transmit antennas and a switch unit. The signal processing unit has K precoders for precoding K data streams corresponding to K receiving terminals. The MS RF units output MS up-converted transmit signals based on the precoded K data streams. The switch unit is coupled between the RF units and the transmit antennas and controlled by the signal processing unit for selection of the transmit antennas. The signal processing unit sets the MT transmit antennas as a universal set, calculates a plurality of sum rates corresponding to a plurality of subsets, each subset excluding an ith transmit antenna, according to channel state information, selects the subset with a maximum sum rate as the universal set of a next iteration, and then repeats the calculating and selecting steps until the subset with the maximum sum rate remaining MS transmit antennas.
    Type: Grant
    Filed: December 3, 2010
    Date of Patent: May 14, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Pu-Hsuan Lin, Shang-Ho Tsai, Yung-Chuan Lin, Gene C. H. Chuang
  • Patent number: 8391408
    Abstract: A spatial mapping matrix searching apparatus may include a plurality of antennae configured to receive a plurality of transmission signals, a post-coding module configured to generate a post-coding information according to the received plurality of transmission signals and generate a received signal from the received plurality of transmission signals, and a pre-coding module configured to generate a pre-coding information according to the post-coding information.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: March 5, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Cheng-Ming Chen, Chien-Yu Kao, Pang-An Ting, Shang-Ho Tsai
  • Publication number: 20120140848
    Abstract: A transmitting terminal includes a signal processing unit, MS RF units, MT transmit antennas and a switch unit. The signal processing unit has K precoders for precoding K data streams corresponding to K receiving terminals. The MS RF units output MS up-converted transmit signals based on the precoded K data streams. The switch unit is coupled between the RF units and the transmit antennas and controlled by the signal processing unit for selection of the transmit antennas. The signal processing unit sets the MT transmit antennas as a universal set, calculates a plurality of sum rates corresponding to a plurality of subsets, each subset excluding an ith transmit antenna, according to channel state information, selects the subset with a maximum sum rate as the universal set of a next iteration, and then repeats the calculating and selecting steps until the subset with the maximum sum rate remaining MS transmit antennas.
    Type: Application
    Filed: December 3, 2010
    Publication date: June 7, 2012
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Pu-Hsuan Lin, Shang-Ho Tsai, Yung-Chuan Lin, Gene C.H. Chuang
  • Publication number: 20110158341
    Abstract: A method and apparatus are disclosed for phase quantization and equal gain precoding in a wireless communication system. The method includes scaling, by a receiving device, a phase vector based on a predetermined scaling factor to determine a first lattice point. The method also includes determining, by the receiving device, a second lattice point based on the determined first lattice point. In addition, the method includes determining, by the receiving device, a quantized phase vector based on the determined second lattice point and the predetermined scaling factor.
    Type: Application
    Filed: October 5, 2010
    Publication date: June 30, 2011
    Inventors: Shang-Ho Tsai, Hsiao-Lan Chiang, Ping-Heng Kuo, Pang-An Ting, Gene C.H. Chuang
  • Publication number: 20100202570
    Abstract: A method for estimating a phase error existing in a receiver of a MIMO OFDM communications system is disclosed. The method includes executing Hermitian transpose on channel coefficient matrix of the MIMO OFDM communications system for generating Hermitian-transposed channel coefficient matrix, multiplying received signal matrix of the receiver with the Hermitian-transposed channel coefficient matrix for generating converted signals, summing products of the converted signals and complex conjugates of pilot signals corresponding to the converted signals for generating a sum result, and generating the phase error according to the sum result, the converted signals, and the complex conjugates of the pilot signals. The pilot signals are extracted from the received signal matrix.
    Type: Application
    Filed: April 22, 2010
    Publication date: August 12, 2010
    Inventors: Shang-Ho Tsai, Hsiao-Lan Chiang, Hsuan-Yu Liu, Po-Yuen Cheng
  • Publication number: 20100166093
    Abstract: A method for estimating a phase error existing in a receiver of a MIMO OFDM communications system is disclosed. The method includes executing Hermitian transpose on channel coefficient matrix of the MIMO OFDM communications system for generating Hermitian-transposed channel coefficient matrix, multiplying received signal matrix of the receiver with the Hermitian-transposed channel coefficient matrix for generating converted signals, summing products of the converted signals and complex conjugates of pilot signals corresponding to the converted signals for generating a sum result, and generating the phase error according to the sum result, the converted signals, and the complex conjugates of the pilot signals. The pilot signals are extracted from the received signal matrix.
    Type: Application
    Filed: December 31, 2008
    Publication date: July 1, 2010
    Inventors: Shang-Ho Tsai, Hsiao-Lan Chiang, Hsuan-Yu Liu, Po-Yuen Cheng
  • Patent number: 7733975
    Abstract: A method for estimating a phase error existing in a receiver of a MIMO OFDM communications system is disclosed. The method includes executing Hermitian transpose on channel coefficient matrix of the MIMO OFDM communications system for generating Hermitian-transposed channel coefficient matrix, multiplying received signal matrix of the receiver with the Hermitian-transposed channel coefficient matrix for generating converted signals, summing products of the converted signals and complex conjugates of pilot signals corresponding to the converted signals for generating a sum result, and generating the phase error according to the sum result, the converted signals, and the complex conjugates of the pilot signals. The pilot signals are extracted from the received signal matrix.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: June 8, 2010
    Assignee: Mediatek Inc.
    Inventors: Shang-Ho Tsai, Hsiao-Lan Chiang, Hsuan-Yu Liu, Po-Yuen Cheng