Patents by Inventor Kyoung-Hwan JU

Kyoung-Hwan JU 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: 11906558
    Abstract: A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.
    Type: Grant
    Filed: October 21, 2022
    Date of Patent: February 20, 2024
    Assignee: INNOWIRELESS CO., LTD.
    Inventors: Young Su Kwak, Kyoung Hwan Ju
  • Patent number: 11740269
    Abstract: A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.
    Type: Grant
    Filed: May 11, 2020
    Date of Patent: August 29, 2023
    Assignee: INNOWIRELESS CO., LTD.
    Inventors: Young Su Kwak, Kyoung Hwan Ju
  • Publication number: 20230037910
    Abstract: A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.
    Type: Application
    Filed: October 21, 2022
    Publication date: February 9, 2023
    Inventors: Young Su KWAK, Kyoung Hwan JU
  • Publication number: 20200379024
    Abstract: A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.
    Type: Application
    Filed: May 11, 2020
    Publication date: December 3, 2020
    Inventors: Young Su KWAK, Kyoung Hwan JU
  • Patent number: 10178565
    Abstract: Provided is a channel simulator having a function of supporting a carrier aggregation and a carrier aggregation block used for the same to support a carrier aggregation function at a minimum path loss without reducing the number of valid connectable terminals. The channel simulator includes: a terminal interface block connected to each of at least four terminals through at least two transmission/reception ports; a carrier aggregation block including unit modules each including one RF coupler and one RF switch, and interposed between the terminal interface block and the terminal to support the carrier aggregation for one to four component carriers; and a management server. The carrier aggregation block includes a front-end carrier aggregation unit and a rear-end carrier aggregation unit.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: January 8, 2019
    Assignee: INNOWIRELESS CO., LTD.
    Inventors: Jin Soup Joung, Joo Hyeong Lee, Yong Hoon Lim, Kyoung Hwan Ju
  • Patent number: 10177835
    Abstract: An adaptive interference cancellation apparatus for cancelling a side lobe between neighboring cells installed in a repeater and capable of improving quality of a communication signal and preventing frequent handover by maintaining a serving base station signal among repeater signals and cancelling an interference signal from a neighboring cell is provided.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: January 8, 2019
    Assignee: INNOWIRELESS CO., LTD.
    Inventors: Jin-Soup Joung, Joo-Hyeong Lee, Kyoung-Hwan Ju, June-Hwan Kim
  • Patent number: 10051579
    Abstract: Provided is a control method for a channel simulator, capable of expanding a processable dynamic range of an uplink signal receiving unit while adopting an A/D converter (ADC) having low resolution by adjusting an attenuation amount of the uplink signal receiving unit in a large-capacity channel simulator having P base stations and Q terminal interfaces.
    Type: Grant
    Filed: December 27, 2016
    Date of Patent: August 14, 2018
    Assignee: INNOWIRELESS CO., LTD.
    Inventors: Jin Soup Joung, Joo Hyeong Lee, Yong Hoon Lim, Kyoung Hwan Ju
  • Publication number: 20180213419
    Abstract: Provided is a channel simulator having a function of supporting a carrier aggregation and a carrier aggregation block used for the same to support a carrier aggregation function at a minimum path loss without reducing the number of valid connectable terminals. The channel simulator includes: a terminal interface block connected to each of at least four terminals through at least two transmission/reception ports; a carrier aggregation block including unit modules each including one RF coupler and one RF switch, and interposed between the terminal interface block and the terminal to support the carrier aggregation for one to four component carriers; and a management server. The carrier aggregation block includes a front-end carrier aggregation unit and a rear-end carrier aggregation unit.
    Type: Application
    Filed: June 16, 2017
    Publication date: July 26, 2018
    Inventors: Jin Soup JOUNG, Joo Hyeong LEE, Yong Hoon LIM, Kyoung Hwan JU
  • Patent number: 9960945
    Abstract: Provided is a method of processing a Wideband Code Division Multiple Access (WCDMA) signal timing offset for a signal analyzer. The method includes estimating an integer multiple timing offset of WCDMA baseband sample data corresponding to an amount of at least one frame; generating a frequency domain signal which is time delayed corresponding to a fractional timing offset estimation resolution after generating the frequency domain signal by performing a Fast Fourier Transform (FFT) calculation on an already-known reference signal; converting each time-delayed frequency domain signal into a time domain signal by performing an Inverse Fast Fourier Transform (IFFT) calculation on each time-delayed frequency domain signal and calculating a correlation between an input signal from a position of the integer multiple timing offset and the time domain signal; and estimating a delay time leading to a maximum correlation as a fractional timing offset.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: May 1, 2018
    Assignee: INNOWIRELESS CO., LTD.
    Inventors: Jin Soup Joung, Joo Hyeong Lee, Yong Hoon Lim, Kyoung Hwan Ju
  • Patent number: 9877207
    Abstract: A calibration method for a channel simulator is applied to a large-capacity channel simulator having the interfaces of P base stations and Q terminals so that path loss calibration for P×Q paths is more rapidly and easily performed.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: January 23, 2018
    Assignee: INNOWIRELESS CO., LTD.
    Inventors: Jin Soup Joung, Yong Hoon Lim, Kyoung Hwan Ju
  • Patent number: 9749155
    Abstract: Provided is a method of blindly estimating WCDMA OVSF of a signal analyzer, which includes: (a) setting SF to 512 and an index thereof to 0; (b) calculating a power average value of a symbol obtained by despreading descrambled data with an OVSF code set by increasing the index from ‘0’ by ‘1’; (c) determining an OVSF code by which the power average value is equal to or greater than a power reference value as a used OVSF code candidate and determining an OVSF code by which the power average value is less than the power reference value as an unused OVSF code; (d) comparing a zero crossing rate of a symbol with a reference value to determine whether the OVSF code candidate is the used OVSF code; and (e) repeating (b) to (d) while reducing the SF half by half until the SF is equal to 4.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: August 29, 2017
    Assignee: INNOWIRELESS CO., LTD.
    Inventors: Jin Soup Joung, Joo Hyeong Lee, Yong Hoon Lim, Kyoung Hwan Ju
  • Publication number: 20170237597
    Abstract: Provided is a method of processing a WCDMA signal timing offset for a signal analyzer. The method includes estimating an integer multiple timing offset of WCDMA baseband sample data corresponding to an amount of at least one frame; generating a frequency domain signal which is time delayed corresponding to a fractional timing offset estimation resolution after generating the frequency domain signal by performing an FFT calculation on an already-known reference signal; converting each time-delayed frequency domain signal into a time domain signal by performing an IFFT calculation on each time-delayed frequency domain signal and calculating a correlation between an input signal from a position of the integer multiple timing offset and the time domain signal; and estimating a delay time leading to a maximum correlation as a fractional timing offset.
    Type: Application
    Filed: February 22, 2016
    Publication date: August 17, 2017
    Inventors: Jin Soup JOUNG, Joo Hyeong LEE, Yong Hoon LIM, Kyoung Hwan JU
  • Publication number: 20170237585
    Abstract: Provided is a method of blindly estimating WCDMA OVSF of a signal analyzer, which includes: (a) setting SF to 512 and an index thereof to 0; (b) calculating a power average value of a symbol obtained by despreading descrambled data with an OVSF code set by increasing the index from ‘0’ by ‘1’; (c) determining an OVSF code by which the power average value is equal to or greater than a power reference value as a used OVSF code candidate and determining an OVSF code by which the power average value is less than the power reference value as an unused OVSF code; (d) comparing a zero crossing rate of a symbol with a reference value to determine whether the OVSF code candidate is the used OVSF code; and (e) repeating (b) to (d) while reducing the SF half by half until the SF is equal to 4.
    Type: Application
    Filed: January 26, 2017
    Publication date: August 17, 2017
    Inventors: Jin Soup JOUNG, Joo Hyeong LEE, Yong Hoon LIM, Kyoung Hwan JU
  • Publication number: 20170188313
    Abstract: Provided is a control method for a channel simulator, capable of expanding a processable dynamic range of an uplink signal receiving unit while adopting an A/D converter (ADC) having low resolution by adjusting an attenuation amount of the uplink signal receiving unit in a large-capacity channel simulator having P base stations and Q terminal interfaces.
    Type: Application
    Filed: December 27, 2016
    Publication date: June 29, 2017
    Inventors: Jin Soup JOUNG, Joo Hyeong LEE, Yong Hoon LIM, Kyoung Hwan JU
  • Patent number: 9632130
    Abstract: An apparatus and method for detecting a cable fault which simultaneously apply a plurality of measurement frequencies mutually orthogonal to a cable and estimate reflection coefficients at the measurement frequencies using filters for filtering only the respective measurement frequencies to reduce a time taken to detect a cable fault.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: April 25, 2017
    Assignee: INNOWIRELESS CO., LTD.
    Inventors: Jin Soup Joung, Sung Chan Choi, Yong Hoon Lim, Kyoung Hwan Ju, Hyo Bin Yim
  • Publication number: 20160353289
    Abstract: A calibration method for a channel simulator is applied to a large-capacity channel simulator having the interfaces of P base stations and Q terminals so that path loss calibration for P×Q paths is more rapidly and easily performed.
    Type: Application
    Filed: May 26, 2016
    Publication date: December 1, 2016
    Inventors: Jin Soup JOUNG, Yong Hoon LIM, Kyoung Hwan JU
  • Publication number: 20160202309
    Abstract: An apparatus and method for detecting a cable fault which simultaneously apply a plurality of measurement frequencies mutually orthogonal to a cable and estimate reflection coefficients at the measurement frequencies using filters for filtering only the respective measurement frequencies to reduce a time taken to detect a cable fault.
    Type: Application
    Filed: February 10, 2015
    Publication date: July 14, 2016
    Inventors: Jin Soup Joung, Sung Chan Choi, Yong Hoon Lim, Kyoung Hwan Ju, Hyo Bin Yim
  • Publication number: 20150333818
    Abstract: An adaptive interference cancellation apparatus for cancelling a side lobe between neighboring cells installed in a repeater and capable of improving quality of a communication signal and preventing frequent handover by maintaining a serving base station signal among repeater signals and cancelling an interference signal from a neighboring cell is provided.
    Type: Application
    Filed: May 27, 2014
    Publication date: November 19, 2015
    Applicant: INNOWIRELESS CO., LTD.
    Inventors: Jin-Soup Joung, Joo-Hyeong Lee, Kyoung-Hwan JU, June-Hwan Kim