Patents by Inventor Kun-Tso Chen

Kun-Tso Chen 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: 20090103656
    Abstract: A correlation device and method for different modulated signals such as BPSK signal and BOC signal. According to the present invention, the correlation device has one or more sections. Each section comprises a correlation unit for executing correlation; a first signal path for passing a received signal directly to the correlation unit; a second signal path for transferring a BOC signal into a BPSK-like signal and passing the signal to the correlation unit. The correlation unit has a multiplexer for selecting to allow an output of one of the first and second signal paths to be subject to signal correlation. The correlation results of the respective sections can be combined.
    Type: Application
    Filed: October 18, 2007
    Publication date: April 23, 2009
    Applicant: MEDIATEK Inc.
    Inventor: Kun-tso Chen
  • Publication number: 20090096668
    Abstract: A Doppler frequency searching method and correlator are disclosed. In the present invention, before Doppler frequency removal, a received signal is converted into digital form and the spreading code is removed. Then the signal is down-sampled to have a low sampling rate, which can be determined according to the maximum Doppler frequency to be searched. The Doppler frequency searching is done by stages. Each stage is in charge of a portion of the Doppler frequency to be removed. The sampling rate can be further reduced in each stage. Each stage can have a plurality of Doppler frequency removal units sharing the portion of Doppler frequency that the stage is to remove. Power consumption is reduced since Doppler frequency removal is executed with low sampling rate.
    Type: Application
    Filed: October 11, 2007
    Publication date: April 16, 2009
    Applicant: MEDIATEK Inc.
    Inventor: Kun-tso Chen
  • Publication number: 20090028223
    Abstract: The invention provides a signal receiver. The signal receiver comprises a code removal module, a carrier removal module, a Fast Fourier Transformation (FFT) module, and a signal processor. The code removal module removes a pseudo random noise code from a first signal to obtain a second signal. The carrier removal module generates a carrier signal with a frequency of an estimated carrier frequency, generates at least one delta carrier signal with a frequency of the carrier frequency plus a delta frequency, removes the carrier signal from the second signal to obtain a third signal, and removes the delta carrier signal from the second signal to obtain a fourth signal. The FFT module derives a series of first FFT values from the third signal, and derives a series of second FFT values from the fourth signal.
    Type: Application
    Filed: July 27, 2007
    Publication date: January 29, 2009
    Applicant: MEDIATEK INC.
    Inventor: Kun-Tso Chen
  • Patent number: 7453926
    Abstract: Methods and systems for detecting bit synchronization boundary in a received signal. A counter is set for defining a bit boundary of the received signal. Transitions in the received signal are detected and compared with the counter value as the transitions are expected to occur only at the bit boundary. The bit boundary is confirmed if a preset number of transitions aligned with the bit boundary.
    Type: Grant
    Filed: June 1, 2005
    Date of Patent: November 18, 2008
    Assignee: Mediatek Incorporation
    Inventors: Chun-Nan Chen, Kun-Tso Chen
  • Publication number: 20080240306
    Abstract: The invention provides a correlation device performing correlation on a received Global Navigation Satellite System (GNSS) signal. The correlation device comprises a first decimation module, a second decimation module, and a correlation module. The first decimation module decimates a plurality of samples of the received GNSS signal to obtain a plurality of decimated samples. The second decimation module decimates a plurality of code bits of a locally generated replica code to obtain a plurality of decimated code bits. The correlation module correlates the decimated samples with the decimated code bits to obtain a plurality of correlation results, thus achieving a coarse correlation between the received GNSS signal and the locally generated replica code.
    Type: Application
    Filed: March 26, 2007
    Publication date: October 2, 2008
    Applicant: MEDIATEK INC.
    Inventors: Kun-Tso Chen, Jui-Ming Wei, Chun-Nan Chen
  • Publication number: 20080165057
    Abstract: A method and apparatus for collecting subframes of navigation data of satellites are disclosed. In the method of the present invention, the subframe is divided into several sub-units, each sub-units includes one or more words. When a receiver receives a subframe with a subframe ID, the respective required sub-units of the subframe are checked. A dummy sub-unit is not necessary to be considered. Valid ones of the required sub-units are collected. If not all the required sub-units of the subframe have been collected, the absent sub-units are to be collected when the next subframe with the same subframe ID is received. Some protection schemes can be applied to raise the reliability of such sub-unit collection. Especially when the signal is weak or unstable, the present invention may significantly improve the TTFF (Time To First Fix) performance of the receiver.
    Type: Application
    Filed: January 5, 2007
    Publication date: July 10, 2008
    Applicant: Media Tek Inc.
    Inventors: Kuan-i Li, Kung-shuan Huang, Kun-tso Chen
  • Publication number: 20080159198
    Abstract: A BOC signal acquisition and tracking apparatus and method. In the present invention, at least a BOC signal, a BOC-cos signal and a PRN coded signal are generated for a received signal. Depending on application condition (e.g. acquisition mode or tracking mode), autocorrelation of the BOC signal is combined with cross-correlation of the BOC signal and one of the BOC-cos signal and the PRN coded signal to generate a proper combined correlation result.
    Type: Application
    Filed: December 27, 2006
    Publication date: July 3, 2008
    Applicant: MediaTek Inc.
    Inventors: Chun-nan Chen, Kun-tso Chen, Jui-ming Wei
  • Publication number: 20080152044
    Abstract: An improved Viterbi decoding method for convolutionally encoded signals is disclosed. By using the method of the present invention, a trellis of Viterbi Algorithm (VA) for convolutionally encoded SBAS signal, for example, are arranged into butterflies. The butterflies are classified into groups according to branch metrics. Therefore, the butterflies can be effectively processed since the same butterfly processing kernel can be used repeatedly. Therefore, the code size and processing time can be reduced, so that Viterbi Algorithm can be more easily implemented by software.
    Type: Application
    Filed: December 20, 2006
    Publication date: June 26, 2008
    Applicant: Media Tek Inc.
    Inventor: Kun-tso Chen
  • Publication number: 20080013604
    Abstract: A method for determining boundaries of information elements for a PRN code modulated signal is provided. The method of the present invention uses an estimated symbol phase of the received signal and correlation values of different durations to determine the information element boundary. By the method of the present invention, the determination of the information element boundary can be more effective especially in the common dump receiver architecture, where the correlation window cannot match the received waveform exactly.
    Type: Application
    Filed: July 17, 2006
    Publication date: January 17, 2008
    Applicant: Media Tek Inc.
    Inventor: Kun-tso Chen
  • Publication number: 20070229352
    Abstract: A method for searching satellites is disclosed. In the method of the present invention, the satellites are selected to consist of a group, and searching is conducted in this group. The group size is predetermined for each stage so as to be the most appropriate for various searching conditions. The member number of the group (i.e. group size) and the members of the group are updated as the searching results are continually obtained. The updates are done according to scanning times of the group, satellite hit number, searching time for the group and satellite priorities and the like, for example. The group size can be reduced or expanded. By using the method, satellites required to fix a position can be rapidly found.
    Type: Application
    Filed: December 1, 2006
    Publication date: October 4, 2007
    Applicant: MediaTek Inc.
    Inventors: Kun-tso Chen, Kung-shuan Huang, Jan-shin Ho
  • Publication number: 20070229351
    Abstract: A method for searching satellites in a cold start state. The method of the present invention, a first satellite, which is predetermined or randomly selected, is searched. Then, a second satellite to be searched is selected according to the searching result (hit or missed) for the first satellite and respective interrelationships between the first satellite and the other satellites. In practice, an initial weight factor table is provided. Depending on the searching result, the initial weight factor table is updated according to the interrelationships between the satellites during searching. By using the method of the present invention, the time-to-first-fix (TTFF) can be reduced to a shorter period of time so as to provide a rapid cold start satellite positioning.
    Type: Application
    Filed: March 28, 2006
    Publication date: October 4, 2007
    Inventors: Kun-tso Chen, Kung-shuan Huang
  • Publication number: 20060274821
    Abstract: Methods and systems for detecting bit synchronization boundary in a received signal. A counter is set for defining a bit boundary of the received signal. Transitions in the received signal are detected and compared with the counter value as the transitions are expected to occur only at the bit boundary. The bit boundary is confirmed if a preset number of transitions aligned with the bit boundary.
    Type: Application
    Filed: June 1, 2005
    Publication date: December 7, 2006
    Inventors: Chun-Nan Chen, Kun-Tso Chen
  • Patent number: 6990095
    Abstract: A self-routing data switching system is disclosed. The data switching system includes a plurality of repetitive switching matrix planes, each of which is electrically connected between a less number of input terminals and a larger number of output terminals, thereby reducing the head-of-line blocking effect. Each switching matrix plane includes a switching element array interconnected between the input ports and the output ports for determining whether the data packet from an input port can be transmitted to a designated output port. The data switching system further includes a plurality of pre-processors to manage the input timing of data packets into the switching matrix array in order to avoid output conflict.
    Type: Grant
    Filed: October 2, 2001
    Date of Patent: January 24, 2006
    Assignee: National Taiwan University
    Inventors: Jingshown Wu, Kun-Tso Chen, Hen-Wai Tsao
  • Publication number: 20040066791
    Abstract: An asynchronous expansible switching system for switching packet with different length mainly comprising a plurality of linecards, preprocessors, sequencers, switching planes and multiplexers and is able to provide an optional routing mechanism for a distributed packet, wherein the switch is able to expand the switching plane in accordance with the increase of the input port and the output port and transmit the packets within the buffering of the output port of the switching plane to the output port by the control of the preprocessor and the sequencer.
    Type: Application
    Filed: October 2, 2002
    Publication date: April 8, 2004
    Inventors: Jingshown Wu, Kun-Tso Chen, Hen-Wai Tsao, Ting-Yuan Wang
  • Publication number: 20030063603
    Abstract: A self-routing data switching system is disclosed. The data switching system includes a plurality of repetitive switching matrix planes, each of which is electrically connected between a less number of input ports and a larger number of output ports, thereby reducing the head-of-line blocking effect. Each switching matrix plane includes a switching element array interconnected between the input ports and the output ports for determining whether the data packet from an input port can be transmitted to a designated output port. The data switching system further includes a plurality of pre-processors to manage the input timing of data packets into the switching matrix array in order to avoid output conflict.
    Type: Application
    Filed: October 2, 2001
    Publication date: April 3, 2003
    Applicant: National Taiwan University
    Inventors: Jingshown Wu, Kun-Tso Chen, Hen-Wai Tsao