Patents by Inventor Pei-Shiun Chung

Pei-Shiun Chung 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: 9831908
    Abstract: Embodiments of the invention provide telecommunications methods that facilitate sharing of spreading codes. According to one of the embodiments, a first telecommunications apparatus first selects a plurality of second telecommunications apparatuses to share at least one spreading code. Then, the first telecommunications apparatus uses each of the at least one spreading code to perform spreading operations for the second telecommunications apparatuses by turns repetitively.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: November 28, 2017
    Assignee: MEDIATEK INC.
    Inventors: Pei-Shiun Chung, Xiu-Sheng Li
  • Patent number: 9686103
    Abstract: A method for compensating the frequency dependent phase imbalance in a receiver is provided. The receiver downconverts an input signal to generate the signal r(t). The signal r(t) has an in-phase component rI(t) and a quadrature component rQ(t). A first test signal with a first carrier frequency is applied as the input signal of the receiver to obtain a first phase imbalance I. A second test signal with a second carrier frequency is applying as the input signal of the receiver to obtain a second phase imbalance. An IQ delay mismatch ?t of the receiver according to the difference of the second and the first phase imbalances and the difference of the second and the first carrier frequencies is obtained. The in-phase component rI(t) and the quadrature component rQ(t) of the signal r(t) corresponding to other input signal is compensated according to the obtained IQ delay mismatch ?t.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: June 20, 2017
    Assignee: MEDIATEK INC.
    Inventors: Kuo-Hao Chen, Chun-Hao Liao, Pei-Shiun Chung, Hsin-Hung Chen
  • Patent number: 9473271
    Abstract: An embodiment of the invention provides a telecommunications method to be performed by a first telecommunications device while trying to transmit a data block to a second telecommunications device. According to the embodiment, the first telecommunications device determines whether a first set of early termination criteria is satisfied. Then, if the first set of early termination criteria is satisfied, the first telecommunications device further determines whether a second set of early termination criteria is satisfied. The second set of early termination criteria is different from the first set of early termination criteria. If both the first set of early termination criteria and the second set of early termination criteria are satisfied before the first telecommunications device finishes transmitting the data block, the first telecommunications device reduces a transmission power.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: October 18, 2016
    Assignee: MEDIATEK INC.
    Inventors: Pei-Shiun Chung, Xiu-Sheng Li
  • Patent number: 9184945
    Abstract: A method for compensating the frequency dependent phase imbalance in a transmitter is provided. The transmitter processes a baseband signal. The method includes the following steps: (a) compensating the baseband signal with a predetermined delay amounts; (b) inputting the compensated baseband signal to an upconversion circuit to generate a radio frequency (RF) signal; (c) inputting the RF signal to a delay information extractor to obtain a correlation value related to the information of the predetermined delay amount; (d) changing the predetermined delay amount and compensating the baseband signal again with the changed predetermined delay amount, and performing steps (b) and (c) again to update the correlation value; and (e) selecting a candidate delay amount from the predetermined delay amount according to the correlation value, and compensating the transmitter by using the candidate delay amount.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: November 10, 2015
    Assignee: MediaTek Inc.
    Inventors: Kuo-Hao Chen, Chun-Hao Liao, Pei-Shiun Chung, Hsin-Hung Chen
  • Patent number: 9158611
    Abstract: An embodiment of the invention provides a telecommunications method performed by a second telecommunications device. According to the embodiment, the second telecommunications device first tries to use a received part of a data block to decode the data block, wherein the received part is received from a first telecommunications device. Next, the second telecommunications device determines whether a code metric derived based on the received part indicates that the data block is decodable. If the code metric indicates that the data block is decodable, the second telecommunications device further determines whether a set of confirmation criteria is satisfied.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: October 13, 2015
    Assignee: MEDIATEK INC.
    Inventors: Pei-Shiun Chung, Xiu-Sheng Li
  • Patent number: 9161321
    Abstract: The present invention provides a method and associated apparatus providing a signal metric for a transmitter of a communication system including: accumulating a plurality of power terms, each power term corresponding to a product of one of symbol amplitudes and one of scaling factors; and calculating the signal metric according to the accumulated power terms.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: October 13, 2015
    Assignee: MEDIATEK INC.
    Inventors: Pei-Shiun Chung, Qian-Zhi Huang
  • Patent number: 9107091
    Abstract: The present invention provides a method and apparatus reporting a channel quality indicator (CQI) of a communication system, including: detecting a first measurement reflecting a first communication quality of the communication system, providing first reference(s) respectively corresponding to indicator level(s), providing CQI according to the indicator level(s) and a relation between the first measurement and the first reference(s), and updating one (or more) first reference according to a second measurement reflecting a second communication quality of the communication system. For example, the first measurement can represent signal to interference ratio or mutual information, and the second measurement can represent data error rate or throughput. First reference(s) can be further adjusted according to a third measurement, e.g., a power scheduling of base station, such that CQI can be updated if base station schedules additional transmission power.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: August 11, 2015
    Assignee: MEDIATEK INC.
    Inventors: Pei-Shiun Chung, Qian-Zhi Huang, Yi-Chang Liu
  • Publication number: 20140301501
    Abstract: A method for compensating the frequency dependent phase imbalance in a transmitter is provided. The transmitter processes a baseband signal. The method includes the following steps: (a) compensating the baseband signal with a predetermined delay amounts; (b) inputting the compensated baseband signal to an upconversion circuit to generate a radio frequency (RF) signal; (c) inputting the RF signal to a delay information extractor to obtain a correlation value related to the information of the predetermined delay amount; (d) changing the predetermined delay amount and compensating the baseband signal again with the changed predetermined delay amount, and performing steps (b) and (c) again to update the correlation value; and (e) selecting a candidate delay amount from the predetermined delay amount according to the correlation value, and compensating the transmitter by using the candidate delay amount.
    Type: Application
    Filed: June 20, 2014
    Publication date: October 9, 2014
    Inventors: Kuo-Hao Chen, Chun-Hao Liao, Pei-Shiun Chung, Hsin-Hung Chen
  • Publication number: 20130322422
    Abstract: An embodiment of the invention provides a telecommunications method performed by a first telecommunications device while communicating with a second telecommunications device. According to the embodiment, the first telecommunications device generates a physical bits block based on an encoded bits block, wherein the physical bits block fits an available physical bits number. Then, the first telecommunications device maps the physical bits block onto a physical channel. Next, the first telecommunications device either performs or not performs early termination for the physical bits block.
    Type: Application
    Filed: March 13, 2013
    Publication date: December 5, 2013
    Applicant: MEDIATEK INC.
    Inventors: Pei-Shiun Chung, Xiu-Sheng Li
  • Publication number: 20130322494
    Abstract: Embodiments of the invention provide telecommunications methods that facilitate sharing of spreading codes. According to one of the embodiments, a first telecommunications apparatus first selects a plurality of second telecommunications apparatuses to share at least one spreading code. Then, the first telecommunications apparatus uses each of the at least one spreading code to perform spreading operations for the second telecommunications apparatuses by turns repetitively.
    Type: Application
    Filed: March 13, 2013
    Publication date: December 5, 2013
    Applicant: MEDIATEK INC.
    Inventors: Pei-Shiun Chung, Xiu-Sheng Li
  • Publication number: 20130326319
    Abstract: An embodiment of the invention provides a telecommunications method performed by a second telecommunications device. According to the embodiment, the second telecommunications device first tries to use a received part of a data block to decode the data block, wherein the received part is received from a first telecommunications device. Next, the second telecommunications device determines whether a code metric derived based on the received part indicates that the data block is decodable. If the code metric indicates that the data block is decodable, the second telecommunications device further determines whether a set of confirmation criteria is satisfied.
    Type: Application
    Filed: March 13, 2013
    Publication date: December 5, 2013
    Applicant: MEDIATEK INC.
    Inventors: Pei-Shiun Chung, Xiu-Sheng Li
  • Publication number: 20130322259
    Abstract: An embodiment of the invention provides a telecommunications method to be performed by a first telecommunications device while trying to transmit a data block to a second telecommunications device. According to the embodiment, the first telecommunications device determines whether a first set of early termination criteria is satisfied. Then, if the first set of early termination criteria is satisfied, the first telecommunications device further determines whether a second set of early termination criteria is satisfied. The second set of early termination criteria is different from the first set of early termination criteria. If both the first set of early termination criteria and the second set of early termination criteria are satisfied before the first telecommunications device finishes transmitting the data block, the first telecommunications device reduces a transmission power.
    Type: Application
    Filed: March 13, 2013
    Publication date: December 5, 2013
    Applicant: MEDIATEK INC.
    Inventors: Pei-Shiun Chung, Xiu-Sheng Li
  • Publication number: 20130287082
    Abstract: A method for compensating the frequency dependent phase imbalance in a receiver is provided. The receiver downconverts an input signal to generate the signal r(t). The signal r(t) has an in-phase component rI(t) and a quadrature component rQ(t). A first test signal with a first carrier frequency is applied as the input signal of the receiver to obtain a first phase imbalance I. A second test signal with a second carrier frequency is applying as the input signal of the receiver to obtain a second phase imbalance. An IQ delay mismatch ?t of the receiver according to the difference of the second and the first phase imbalances and the difference of the second and the first carrier frequencies is obtained. The in-phase component rI(t) and the quadrature component rQ(t) of the signal r(t) corresponding to other input signal is compensated according to the obtained IQ delay mismatch ?t.
    Type: Application
    Filed: March 12, 2013
    Publication date: October 31, 2013
    Applicant: MEDIATEK INC.
    Inventors: Kuo-Hao Chen, Chun-Hao Liao, Pei-Shiun Chung, Hsin-Hung Chen
  • Publication number: 20130286877
    Abstract: The present invention provides a method and apparatus reporting a channel quality indicator (CQI) of a communication system, including: detecting a first measurement reflecting a first communication quality of the communication system, providing first reference(s) respectively corresponding to indicator level(s), providing CQI according to the indicator level(s) and a relation between the first measurement and the first reference(s), and updating one (or more) first reference according to a second measurement reflecting a second communication quality of the communication system. For example, the first measurement can represent signal to interference ratio or mutual information, and the second measurement can represent data error rate or throughput. First reference(s) can be further adjusted according to a third measurement, e.g., a power scheduling of base station, such that CQI can be updated if base station schedules additional transmission power.
    Type: Application
    Filed: June 27, 2013
    Publication date: October 31, 2013
    Inventors: Pei-Shiun Chung, Qian-Zhi Huang, Yi-Chang Liu
  • Patent number: 8494039
    Abstract: The present invention provides a method and apparatus reporting a channel quality indicator of a communication system, including: detecting a first measurement reflecting a first communication quality of the communication system; providing a series of thresholds and mapping functions, each mapping functions in association with a bin defined by two adjacent thresholds, so the first measurement is mapped to the channel quality indicator by the mapping function in association with the bin which matches the first measurement; and updating at least one of the thresholds according to a second measurement which reflects a second communication quality of the communication system.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: July 23, 2013
    Assignee: MediaTek Inc.
    Inventor: Pei-Shiun Chung
  • Publication number: 20120300827
    Abstract: The present invention provides a method and apparatus reporting a channel quality indicator of a communication system, including: detecting a first measurement reflecting a first communication quality of the communication system; providing a series of thresholds and mapping functions, each mapping functions in association with a bin defined by two adjacent thresholds, so the first measurement is mapped to the channel quality indicator by the mapping function in association with the bin which matches the first measurement; and updating at least one of the thresholds according to a second measurement which reflects a second communication quality of the communication system.
    Type: Application
    Filed: May 23, 2011
    Publication date: November 29, 2012
    Applicant: MEDIATEK INC.
    Inventor: Pei-Shiun Chung
  • Patent number: 8320868
    Abstract: A wireless communication unit includes a transmitter for processing a baseband transmit signal to produce a first radio frequency signal. A receiver is arranged to convert a second radio frequency signal to a baseband receive signal, where the receiver has a summation module arranged to add a cancellation signal to the baseband receive signal. A selectivity element is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal. An adaptive estimator module has a filter for filtering the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: November 27, 2012
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Patrick Pratt, William Plumb, Sophie Gault, Pei-Shiun Chung
  • Patent number: 8320866
    Abstract: A wireless communication unit includes a transmitter, a receiver, a selectivity element and a baseband processing module. The receiver has at least one summation module arranged to add a cancellation signal to the quadrature baseband receive signal. a baseband processing module arranged to: receive the quadrature baseband transmit signal and quadrature baseband receive signal; apply independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and apply the independent cancellation signals to the at least one summation module.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: November 27, 2012
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Patrick Pratt, William Plumb, Sophie Gault, Pei-Shiun Chung
  • Publication number: 20120069885
    Abstract: The present invention provides a method and associated apparatus providing a signal metric for a transmitter of a communication system. While the transmitter transmitting a signal with amplitudes scaled by scaling combinations selected from a plurality of scaling combination alternatives, the method including: providing a plurality of power terms, each power term corresponding to one of the scaling combination alternatives; and calculating the signal metric according to the plurality of power terms.
    Type: Application
    Filed: May 23, 2011
    Publication date: March 22, 2012
    Applicant: MediaTek
    Inventors: Pei-Shiun Chung, Qian-Zhi Huang
  • Publication number: 20110195672
    Abstract: A wireless communication unit includes a transmitter for processing a baseband transmit signal to produce a first radio frequency signal. A receiver is arranged to convert a second radio frequency signal to a baseband receive signal, where the receiver has a summation module arranged to add a cancellation signal to the baseband receive signal. A selectivity element is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal. An adaptive estimator module has a filter for filtering the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module.
    Type: Application
    Filed: February 11, 2010
    Publication date: August 11, 2011
    Inventors: Patrick Pratt, William Plumb, Sophie Gault, Pei-Shiun Chung