Patents by Inventor Chin-Liang Wang

Chin-Liang Wang 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).

  • Patent number: 10305523
    Abstract: A transmitting device, for handling signal interference, comprises a first transmitting circuit, for processing a first plurality of baseband signals, to generate a first plurality of radio frequency signals; a second transmitting circuit, for processing a second plurality of baseband signals and a plurality of input signals, to generate a second plurality of radio frequency signals; a feedback circuit, coupled to the second transmitting circuit, for processing the second plurality of radio frequency signals and a plurality of leakage signals, to generate a plurality of error signals; and a control circuit, coupled to the first transmitting circuit, the second transmitting circuit and the feedback circuit, for generating the plurality of input signals according to the first plurality of baseband signals and the plurality of error signals.
    Type: Grant
    Filed: September 3, 2018
    Date of Patent: May 28, 2019
    Assignee: Realtek Semiconductor Corp.
    Inventors: Chin-Liang Wang, Min-Chau Jan, Wen-Shan Wang, Yuan-Shuo Chang, Wu-Chi Wang, Ying-Hsi Lin
  • Patent number: 10237769
    Abstract: This invention provides a joint user clustering and power allocation method and a base station using the same. They are applicable to cooperative non-orthogonal multiple access (NOMA) systems. The method includes: sorting K user equipment devices (UEs) according to the K channel gains between the base station and the K UEs, and then establishing a strong user candidate group of K/2 UEs and a weak user candidate group of K/2 UEs; pairing each of the UEs in the strong user candidate group with each of the UEs in the weak user candidate group so as to divide the K UEs into K/2 clusters, where the power allocation coefficients for each pair of UEs are also calculated during the paring process; and transmitting messages to the K UEs based on the calculated power allocation coefficients of the K/2 clusters.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: March 19, 2019
    Assignee: National Tsing Hua University
    Inventors: Chin-Liang Wang, Jen-Hao Liu, Jyun-Yu Chen
  • Publication number: 20190074855
    Abstract: A transmitting device, for handling signal interference, comprises a first transmitting circuit, for processing a first plurality of baseband signals, to generate a first plurality of radio frequency signals; a second transmitting circuit, for processing a second plurality of baseband signals and a plurality of input signals, to generate a second plurality of radio frequency signals; a feedback circuit, coupled to the second transmitting circuit, for processing the second plurality of radio frequency signals and a plurality of leakage signals, to generate a plurality of error signals; and a control circuit, coupled to the first transmitting circuit, the second transmitting circuit and the feedback circuit, for generating the plurality of input signals according to the first plurality of baseband signals and the plurality of error signals.
    Type: Application
    Filed: September 3, 2018
    Publication date: March 7, 2019
    Inventors: Chin-Liang Wang, Min-Chau Jan, Wen-Shan Wang, Yuan-Shuo Chang, Wu-Chi Wang, Ying-Hsi Lin
  • Patent number: 10218418
    Abstract: This invention provides a relay precoder selection method for two-way amplify-and-forward multiple-input multiple-output (MIMO) relay systems and communication devices using the selection method or the selected relay precoder. According to the relationship between a relay precoder and the singular values of the effective MIMO channels, a set of candidate relay precoders are constructed based on the singular vector subspaces of cascaded MIMO channels, and one of them is selected for meeting a specific design criterion, such as the minimum sum of mean-squared errors, the maximum sum of channel capacities, and the minimum or maximum sum of condition numbers, where the condition number is defined as the ratio of the largest to the smallest singular value of a MIMO channel. As compared with the iterative design methods with the best performance, this invention achieves close performance while requiring much lower computational complexity.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: February 26, 2019
    Assignee: NATIONAL TSING HUA UNIVERSITY
    Inventors: Chin-Liang Wang, Jyun-Yu Chen, Yi-Hsuan Peng
  • Patent number: 10211931
    Abstract: A method of interference cancellation includes the following steps: performing a take-energy operation on a to-be-sent signal at multiple times to generate multiple to-be-sent signal powers; performing a first high-pass operation on the to-be-sent signal powers to generate a to-be-sent high-pass result; performing a second high-pass operation on a received signal to generate a received high-pass result; adjusting multiple filter coefficients according to the to-be-sent high-pass result and the received high-pass result; and generating a recover signal according to the filter coefficients.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: February 19, 2019
    Assignee: Realtek Semiconductor Corp.
    Inventors: Chin-Liang Wang, Kuan-Kai Chen, Min-Chau Jan, Wen-Shan Wang, Yuan-Shuo Chang, Ying-Hsi Lin
  • Patent number: 10135639
    Abstract: This invention discloses a multicarrier communication system that includes a transmitter equipment and a receiver equipment. According to a timing scheme, the transmitter equipment processes multiple original symbols for transmission on multiple subcarrier channels, and the receiver equipment processes and detects multiple received symbols from the multiple subcarrier channels. During a time frame of data transmission, the initial three of the original symbols for each of the subcarrier channels are three pilot symbols, forming a preamble. The three preambles of every consecutive three of the subcarrier channels form a preamble unit. All the pilot symbols of the preamble unit are expressed as a 3×3 matrix. When the center pilot symbol of the preamble unit is normalized to 1 or j (i.e., the imaginary unit), the matrix is [ - j - j - j j 1 - j - j j - j ] ? ? or ? [ 1 1 1 - 1 j 1 1 - 1 1 ] .
    Type: Grant
    Filed: August 17, 2017
    Date of Patent: November 20, 2018
    Assignee: National Tsing Hua University
    Inventors: Chin-Liang Wang, Shao-Cheng Wang
  • Publication number: 20180269935
    Abstract: This invention provides a joint power allocation, precoding, and decoding method and a base station thereof. They are applicable to multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) systems. The method includes: (1) decomposing the precoder for each cluster into a first precoder and a second precoder; (2) obtaining the mean-squared error (MSE) functions of the decoded signals for all user equipment devices in each cluster; (3) calculating the power allocation factors for each cluster in the case of minimizing the maximum of all the MSE functions in each cluster; and (4) obtaining the second precoder and the decoders for each cluster in the case of minimizing a sum of the MSE functions of the decoded signals for all user equipment devices in all clusters under a total power constraint according to the power allocation factors.
    Type: Application
    Filed: July 25, 2017
    Publication date: September 20, 2018
    Applicant: National Tsing Hua University
    Inventors: Chin-Liang Wang, Jyun-Jhe Jheng, Jyun-Yu Chen
  • Patent number: 10079627
    Abstract: This invention provides a joint power allocation, precoding, and decoding method and a base station thereof. They are applicable to multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) systems. The method includes: (1) decomposing the precoder for each cluster into a first precoder and a second precoder; (2) obtaining the mean-squared error (MSE) functions of the decoded signals for all user equipment devices in each cluster; (3) calculating the power allocation factors for each cluster in the case of minimizing the maximum of all the MSE functions in each cluster; and (4) obtaining the second precoder and the decoders for each cluster in the case of minimizing a sum of the MSE functions of the decoded signals for all user equipment devices in all clusters under a total power constraint according to the power allocation factors.
    Type: Grant
    Filed: July 25, 2017
    Date of Patent: September 18, 2018
    Assignee: National Tsing Hua University
    Inventors: Chin-Liang Wang, Jyun-Jhe Jheng, Jyun-Yu Chen
  • Patent number: 10063291
    Abstract: An antenna beam searching method uses a balance puzzle concept to perform group division of a plurality of antenna beams supported by a transmitter end, so as to perform evaluation on the antenna beam group(s) thus divided to determine an angle of departure of the transmitter end.
    Type: Grant
    Filed: October 5, 2017
    Date of Patent: August 28, 2018
    Assignee: NATIONAL TSING HUA UNIVERSITY
    Inventors: Li-Ming Wei, Jen-Ming Wu, Chin-Liang Wang
  • Publication number: 20180234867
    Abstract: This invention provides a joint user clustering and power allocation method and a base station using the same. They are applicable to cooperative non-orthogonal multiple access (NOMA) systems. The method includes: sorting K user equipment devices (UEs) according to the K channel gains between the base station and the K UEs, and then establishing a strong user candidate group of K/2 UEs and a weak user candidate group of K/2 UEs; pairing each of the UEs in the strong user candidate group with each of the UEs in the weak user candidate group so as to divide the K UEs into K/2 clusters, where the power allocation coefficients for each pair of UEs are also calculated during the paring process; and transmitting messages to the K UEs based on the calculated power allocation coefficients of the K/2 clusters.
    Type: Application
    Filed: July 24, 2017
    Publication date: August 16, 2018
    Applicant: National Tsing Hua University
    Inventors: Chin-Liang Wang, Jen-Hao Liu, Jyun-Yu Chen
  • Patent number: 10045350
    Abstract: A method of joint clustering and precoding and a base station using the same are provided and applicable to a non-orthogonal multiple access (NOMA) system. The method includes: dividing four user equipments into a first cluster and a second cluster each consisting of two user equipments; forming a first cluster signal and a second cluster signal for simultaneous transmission at the base station; establishing a first precoding set and a second precoding set for the first cluster and the second cluster, respectively, by using channel state information between the base station and all the user equipments; selecting a first precoder from the first precoding set and a second precoder from the second precoding set; superposing the first cluster signal multiplied by the first precoder and the second cluster signal multiplied by the second precoder and broadcasting a resulting signal to the user equipments in the first and second cluster.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: August 7, 2018
    Assignee: National Tsing Hua University
    Inventors: Chin-Liang Wang, Jyun-Yu Chen, Siu-Hang Lam
  • Publication number: 20180212799
    Abstract: This invention discloses a multicarrier communication system that includes a transmitter equipment and a receiver equipment. According to a timing scheme, the transmitter equipment processes multiple original symbols for transmission on multiple subcarrier channels, and the receiver equipment processes and detects multiple received symbols from the multiple subcarrier channels. During a time frame of data transmission, the initial three of the original symbols for each of the subcarrier channels are three pilot symbols, forming a preamble. The three preambles of every consecutive three of the subcarrier channels form a preamble unit. All the pilot symbols of the preamble unit are expressed as a 3×3 matrix. When the center pilot symbol of the preamble unit is normalized to 1 or j (i.e., the imaginary unit), the matrix is [ - j - j - j j 1 - j - j j - j ] ? ? or ? [ 1 1 1 - 1 j 1 1 - 1 1 ] .
    Type: Application
    Filed: August 17, 2017
    Publication date: July 26, 2018
    Applicant: National Tsing Hua University
    Inventors: Chin-Liang Wang, Shao-Cheng Wang
  • Patent number: 9974081
    Abstract: The disclosure proposes a method of power allocation and a base station using the method. The method is applicable to a base station for transmitting information signals to at least two user equipments in a non-orthogonal multiple access (NOMA) system. The method includes: setting a first transmit power of a first user equipment to be smaller than a second transmit power of a second user equipment, where a channel gain of the first user equipment is larger than that of the second user equipment; calculating a first system capacity of the first user equipment according to the first transmit power, and calculating a second system capacity of the second user equipment according to the second transmit power; summing the first system capacity and the second system capacity to obtain a sum capacity; and calculating the first transmit power and the second transmit power based on maximizing the sum capacity.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: May 15, 2018
    Assignee: National Tsing Hua University
    Inventors: Chin-Liang Wang, Jyun-Yu Chen, Yi-Jhen Chen
  • Publication number: 20180102885
    Abstract: Provided is a cooperative multimedia communication system. The source node includes a first hierarchical modulation constellation diagram, modulates two data streams and transmits a first signal and a second signal. The relay node includes a protection-level-exchanging modulation and a second hierarchical modulation constellation diagram, modulates the second signal to generate a third signal and transmits the third signal. The destination node receives the first signal and the third signal and performs optimal decoding. The present disclosure designs a pair of optimal hierarchical constellation diagrams respectively for the source node and the relay node. Moreover, the present disclosure further provides a cooperative multimedia communication method.
    Type: Application
    Filed: March 22, 2017
    Publication date: April 12, 2018
    Inventors: HAO-YUN HUANG, YUH-REN TSAI, CHIN-LIANG WANG
  • Patent number: 9942014
    Abstract: Provided is a cooperative multimedia communication system. The source node includes a first hierarchical modulation constellation diagram, modulates two data streams and transmits a first signal and a second signal. The relay node includes a protection-level-exchanging modulation and a second hierarchical modulation constellation diagram, modulates the second signal to generate a third signal and transmits the third signal. The destination node receives the first signal and the third signal and performs optimal decoding. The present disclosure designs a pair of optimal hierarchical constellation diagrams respectively for the source node and the relay node. Moreover, the present disclosure further provides a cooperative multimedia communication method.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: April 10, 2018
    Assignee: NATIONAL TSING HUA UNIVERSITY
    Inventors: Hao-Yun Huang, Yuh-Ren Tsai, Chin-Liang Wang
  • Publication number: 20180042021
    Abstract: The disclosure proposes a method of power allocation and a base station using the method. The method is applicable to a base station for transmitting information signals to at least two user equipments in a non-orthogonal multiple access (NOMA) system. The method includes: setting a first transmit power of a first user equipment to be smaller than a second transmit power of a second user equipment, where a channel gain of the first user equipment is larger than that of the second user equipment; calculating a first system capacity of the first user equipment according to the first transmit power, and calculating a second system capacity of the second user equipment according to the second transmit power; summing the first system capacity and the second system capacity to obtain a sum capacity; and calculating the first transmit power and the second transmit power based on maximizing the sum capacity.
    Type: Application
    Filed: September 2, 2016
    Publication date: February 8, 2018
    Applicant: National Tsing Hua University
    Inventors: Chin-Liang Wang, Jyun-Yu Chen, Yi-Jhen Chen
  • Publication number: 20170331496
    Abstract: A decoding method for low density parity check (LDPC) code, used to decode an input signal into a correct codeword according to a predetermined LDPC matrix, is provided. The method includes performing a plurality of decoding attempts according to the LDPC matrix within a predetermined number of decoding attempts, the plurality of decoding attempts at least including a first decoding attempt with use of a first decoding schedule and a second decoding attempt with use of a second decoding schedule. The second decoding attempt is adjacently subsequent to the first decoding attempt. The first decoding schedule as a group is not included in the second decoding schedule.
    Type: Application
    Filed: July 6, 2016
    Publication date: November 16, 2017
    Inventors: Huang-Chang Lee, Yeong-Luh Ueng, Chin-Liang Wang
  • Publication number: 20170317694
    Abstract: An encoding and decoding method of low-density parity-check code is disclosed. The method is following steps: a high rate check code is transferred to a check matrix having a protograph. The check matrix is extended to form an extended base matrix and is split to form a split base matrix. The extended base matrix and the split base matrix are respectively calculated to generate their decoding threshold by a protograph extrinsic information transfer chart. The base matrix with the lower decoding threshold is considered as a low rate base matrix. Repeating the above process until a stop condition is satisfied. The last low rate base matrix is expanded to form a parity check matrix. The transmission data is encoded and decoded by the parity check matrix.
    Type: Application
    Filed: June 29, 2016
    Publication date: November 2, 2017
    Inventors: HUANG-CHANG LEE, I-TSUN HUANG, YEONG-LUH UENG, CHIN-LIANG WANG
  • Publication number: 20170294946
    Abstract: This invention provides a relay precoder selection method for two-way amplify-and-forward multiple-input multiple-output (MIMO) relay systems and communication devices using the selection method or the selected relay precoder. According to the relationship between a relay precoder and the singular values of the effective MIMO channels, a set of candidate relay precoders are constructed based on the singular vector subspaces of cascaded MIMO channels, and one of them is selected for meeting a specific design criterion, such as the minimum sum of mean-squared errors, the maximum sum of channel capacities, and the minimum or maximum sum of condition numbers, where the condition number is defined as the ratio of the largest to the smallest singular value of a MIMO channel. As compared with the iterative design methods with the best performance, this invention achieves close performance while requiring much lower computational complexity.
    Type: Application
    Filed: October 27, 2016
    Publication date: October 12, 2017
    Inventors: Chin-Liang Wang, Jyun-Yu Chen, Yi-Hsuan Peng
  • Publication number: 20170257868
    Abstract: A method of joint clustering and precoding and a base station using the same are provided and applicable to a non-orthogonal multiple access (NOMA) system. The method includes: dividing four user equipments into a first cluster and a second cluster each consisting of two user equipments; forming a first cluster signal and a second cluster signal for simultaneous transmission at the base station; establishing a first precoding set and a second precoding set for the first cluster and the second cluster, respectively, by using channel state information between the base station and all the user equipments; selecting a first precoder from the first precoding set and a second precoder from the second precoding set; superposing the first cluster signal multiplied by the first precoder and the second cluster signal multiplied by the second precoder and broadcasting a resulting signal to the user equipments in the first and second cluster.
    Type: Application
    Filed: July 20, 2016
    Publication date: September 7, 2017
    Inventors: Chin-Liang Wang, Jyun-Yu Chen, Siu-Hang Lam