Patents by Inventor Pansop Kim
Pansop Kim 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).
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Publication number: 20240063923Abstract: Examples relate to setting a performance mode of an RF receiver front end. An example method includes determining a power state of an input signal to an RF receiver front end; and setting a performance mode of the RF receiver front end to one of at least three distinct performance modes offered by the RF receiver front end at least partially responsive to the determined power state of the input signal.Type: ApplicationFiled: August 22, 2023Publication date: February 22, 2024Inventors: Saeed Pourbagheri, Pansop Kim, Rahim Bagheri, Omid Rajaee, Hyunchul Kim, Amr Aly, Mohammad Mehrjoo, Sheng Liu
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Patent number: 8509361Abstract: An acquisition scheme is provided for receiving a Bluetooth basic data rate (BDR) or enhanced data rate (EDR) packet. An acquisition apparatus for a Bluetooth receiver includes: a phase differentiator; a plurality of basic building blocks; a plurality of 1-bit switches; and a correlation computation equation. It features an acquisition circuit implementation with 1-bit correlator hardware shared by access code and EDR synchronization sequence correlation computations.Type: GrantFiled: February 4, 2010Date of Patent: August 13, 2013Assignee: ISSC Technologies Corp.Inventors: Jeng-Hong Chen, Pansop Kim, Hsin-Hsiang Liu, Hsin-Hsu Chi
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Patent number: 8332219Abstract: A speech detection method is presented, which includes the following steps. A first voice captured device samples a first signal and a second voice captured device samples a second signal. The first voice captured device is closer to a speech signal source than the second voice captured device. A first energy corresponding to the first signal within an interval is calculated, a second energy corresponding to the second signal within the interval is calculated, and a first ratio is calculated according to the first energy and the second energy. The first ratio is transformed into a second ratio. A threshold value is set. It is determined whether the speech signal source is detected by comparing the second ratio and the threshold value.Type: GrantFiled: July 30, 2010Date of Patent: December 11, 2012Assignee: ISSC Technologies Corp.Inventors: Ying-Tsung Lin, Yung-Chen Ting, Pansop Kim
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Method and apparatus for phase reference tracking of digital phase modulated signals in the receiver
Patent number: 8300736Abstract: The present invention discloses a method and apparatus to provide, effectively and robustly, a phase reference in phase-domain for digital phase-modulated signals. Not only the first-order but also higher order PLLs are delineated for robust and fast tracking of frequency errors and time-varying frequency errors between the transmitter and the receiver. This invention can be applied to any phase-modulated signal such as PSK, DPSK, ?/4-DPSK, and CPM. The decoders with this invention can achieve close to the performance of coherent detection. Reference [1] D. Divsalar and M. K. Simon, “Multiple-symbols differential detection of MPSK,” IEEE Trans. Commun., vol. 38, pp. 300-308, March 1990. [2] Specification of the Bluetooth System, 2.0+EDR, 4 Nov. 2004.Type: GrantFiled: October 19, 2009Date of Patent: October 30, 2012Assignee: ISSC Technologies Corp.Inventors: Pansop Kim, Jeng-Hong Chen, Hsin-Hsiang Liu -
Patent number: 8259862Abstract: A receiver capable of decoding a symbol based on information on a previous symbol, the symbol and a next symbol in a Gaussian frequency shift keying (GFSK) communication system is provided.Type: GrantFiled: December 14, 2009Date of Patent: September 4, 2012Assignee: ISSC Technologies Corp.Inventors: Wei-Chung Peng, Jeng-Hong Chen, Pansop Kim
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Patent number: 8243781Abstract: The present invention discloses an effective apparatus and method to measure the received signal quality for a GFSK modulated signal with (or without) an unknown modulation index. The signal quality measurements are based on the decoded (unknown or known) bits and the trellis of the frequency discriminator output. This trellis is pre-calibrated with a reference Rx. The transmitted modulation index is also accurately estimated in this invention.Type: GrantFiled: October 19, 2009Date of Patent: August 14, 2012Assignee: ISSC Technologies Corp.Inventors: Pansop Kim, Jeng-Hong Chen, Hsin-Hsiang Liu
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Patent number: 8036298Abstract: The present invention discloses an effective apparatus and method to measure the received signal quality for digital communication systems by measuring error vector measurement (EVM) with embedded EVM measurement block in receivers. The distinction of the present invention is that the EVMSIG and the EVMDATA are measured in the receiver for the SIGNAL fields and DATA fields, respectively. EVMSIG is a good indicator for one spatial stream and EVMDATA is a good indicator for current multiple streams. The receiver determines the optimum number of spatial data streams for feedback to the transmitter based on the combinations of EVMSIG and EVMDATA with or without other algorithms such as analysis on periodically requested sounding packet. The receiver also determines the optimum modulation and coding schemes for feedback based on the EVM measurements.Type: GrantFiled: January 8, 2008Date of Patent: October 11, 2011Assignee: Integrated System Solution Corp.Inventors: Pansop Kim, Jeng-Hong Chen
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Publication number: 20110231186Abstract: A speech detection method is presented, which includes the following steps. A first voice captured device samples a first signal and a second voice captured device samples a second signal. The first voice captured device is closer to a speech signal source than the second voice captured device. A first energy corresponding to the first signal within an interval is calculated, a second energy corresponding to the second signal within the interval is calculated, and a first ratio is calculated according to the first energy and the second energy. The first ratio is transformed into a second ratio. A threshold value is set. It is determined whether the speech signal source is detected by comparing the second ratio and the threshold value.Type: ApplicationFiled: July 30, 2010Publication date: September 22, 2011Applicant: ISSC TECHNOLOGIES CORP.Inventors: Ying Tsung Lin, Yung Chen Ting, Pansop Kim
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Publication number: 20110188614Abstract: An acquisition scheme for receiving a Bluetooth basic data rate (BDR) or enhanced data rate (EDR) packet. A simplified acquisition apparatus for a Bluetooth receiver having a phase differentiator, a plurality of basic building blocks, a plurality of 1-bit switch, and a correlation computation equation. It features a simplified acquisition circuit implementation with a 1-bit correlator hardware shared by access code and EDR synchronization sequence correlation computations. A 4 MHz sampling rate is used for correlation computation. A SINC interpolator is then used to get an 8 or 16 MHz timing resolution for data bit decoding. Based on the measurement results, this simple acquisition scheme can support successful decoding of a received Bluetooth packet with a maximum timing offset of +/?40 ppm and a maximum frequency offset of +/?60 ppm without loss of receiver sensitivity.Type: ApplicationFiled: February 4, 2010Publication date: August 4, 2011Inventors: Jeng-Hong CHEN, Pansop Kim, Hsin-Hsiang Liu, Hsin-Hsu Chi
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Publication number: 20110142173Abstract: A receiver capable of decoding a symbol based on information on a previous symbol, the symbol and a next symbol in a Gaussian frequency shift keying (GFSK) communication system is provided.Type: ApplicationFiled: December 14, 2009Publication date: June 16, 2011Inventors: Wei-Chung Peng, Jeng-Hong Chen, Pansop Kim
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Publication number: 20110090944Abstract: The present invention discloses an effective apparatus and method to measure the received signal quality for a GFSK modulated signal with (or without) an unknown modulation index. The signal quality measurements are based on the decoded (unknown or known) bits and the trellis of the frequency discriminator output. This trellis is pre-calibrated with a reference Rx. The transmitted modulation index is also accurately estimated in this invention.Type: ApplicationFiled: October 19, 2009Publication date: April 21, 2011Inventors: Pansop KIM, Jeng-Hong Chen, Hsin-Hsiang Liu
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METHOD AND APPARATUS FOR PHASE REFERENCE TRACKING OF DIGITAL PHASE MODULATED SIGNALS IN THE RECEIVER
Publication number: 20110090991Abstract: The present invention discloses a method and apparatus to provide, effectively and robustly, a phase reference in phase-domain for digital phase-modulated signals. Not only the first-order but also higher order PLLs are delineated for robust and fast tracking of frequency errors and time-varying frequency errors between the transmitter and the receiver. This invention can be applied to any phase-modulated signal such as PSK, DPSK, ?/4-DPSK, and CPM. The decoders with this invention can achieve close to the performance of coherent detection. Reference [1] D. Divsalar and M. K. Simon, “Multiple-symbols differential detection of MPSK,” IEEE Trans. Commun., vol. 38, pp. 300-308, March 1990. [2] Specification of the Bluetooth System, 2.0+EDR, 4 Nov.Type: ApplicationFiled: October 19, 2009Publication date: April 21, 2011Inventors: Pansop KIM, Jeng-Hong Chen, Hsin-Hsiang Liu -
Patent number: 7773680Abstract: System performance in wireless communication is improved by increasing diversity in time, space and frequency. Information to be transmitted is processed by a convolution encoder to produce encoded bits. The encoded bits are interleaved and mapped to subcarriers. Symbols are created from the subcarriers and the symbols are transmitted so as to increase diversity in time, space and frequency. Circulation transmission in addition to interleaving is used to increase diversity. For example, circulation transmission can be symbol based or subcarrier based.Type: GrantFiled: October 20, 2005Date of Patent: August 10, 2010Assignee: ISSC Technologies Corp.Inventors: Jeng-Hong Chen, Pansop Kim
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Patent number: 7593472Abstract: System performance in wireless communication is improved by increasing diversity in time, space and frequency. In OFDM-based MIMO systems in which the number of antennas M is greater then the number of simultaneously transmitted OFDM symbols N, circulation transmissions according to the present invention improve signal diversity. In symbol-based circulation transmission, N antennas are chosen from the M available antennas to transmit the N OFDM symbols. In subcarrier-based circulation transmission, M output OFDM symbols are composed from the QAM-mappled samples of the N input OFDM symbols. These M output OFDM symbols are then transmitted from the M antennas simultaneously.Type: GrantFiled: October 6, 2005Date of Patent: September 22, 2009Assignee: Integrated System Solution Corp.Inventors: Jeng-Hong Chen, Pansop Kim
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Publication number: 20090175181Abstract: The present invention discloses an effective apparatus and method to measure the received signal quality for digital communication systems by measuring error vector measurement (EVM) with embedded EVM measurement block in receivers. The distinction of the present invention is that the EVMSIG and the EVMDATA are measured in the receiver for the SIGNAL fields and DATA fields, respectively. EVMSIG is a good indicator for one spatial stream and EVMDATA is a good indicator for current multiple streams. The receiver determines the optimum number of spatial data streams for feedback to the transmitter based on the combinations of EVMSIG and EVMDATA with or without other algorithms such as analysis on periodically requested sounding packet. The receiver also determines the optimum modulation and coding schemes for feedback based on the EVM measurements.Type: ApplicationFiled: January 8, 2008Publication date: July 9, 2009Applicant: Integrated System Solution Corp.Inventors: Pansop KIM, Jeng-Hong Chen
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Publication number: 20060088114Abstract: System performance in wireless communication is improved by increasing diversity in time, space and frequency. In OFDM-based MIMO systems in which the number of antennas M is greater then the number of simultaneously transmitted OFDM symbols N, circulation transmissions according to the present invention improve signal diversity. In symbol-based circulation transmission, N antennas are chosen from the M available antennas to transmit the N OFDM symbols. In subcarrier-based circulation transmission, M output OFDM symbols are composed from the QAM-mappled samples of the N input OFDM symbols. These M output OFDM symbols are then transmitted from the M antennas simultaneously.Type: ApplicationFiled: October 6, 2005Publication date: April 27, 2006Inventors: Jeng-Hong Chen, Pansop Kim
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Publication number: 20060088115Abstract: System performance in wireless communication is improved by increasing diversity in time, space and frequency. Information to be transmitted is processed by a convolution encoder to produce encoded bits. The encoded bits are interleaved and mapped to subcarriers. Symbols are created from the subcarriers and the symbols are transmitted so as to increase diversity in time, space and frequency. Circulation transmission in addition to interleaving is used to increase diversity. For example, circulation transmission can be symbol based or subcarrier based.Type: ApplicationFiled: October 20, 2005Publication date: April 27, 2006Inventors: Jeng-Hong Chen, Pansop Kim