Patents by Inventor Keangpo Ho
Keangpo Ho 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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Patent number: 11035944Abstract: Various techniques are provided to efficiently detect the position and angular velocity of an object relative to a compact radar system including a transmitter antenna array and a receiver antenna array. In one example, a method includes repeatedly scanning a transmitter antenna array and a receiver antenna array of an object sensing system through a plurality of designated transmitter and receiver channels over a period of time to generate a time series of measured channel responses corresponding to each one of the designated channels, determining a time series of directional vectors to or from an object scanned by at least one of the designated channels, and/or a corresponding time series of average phase differences, based, at least in part, on the time series of measured channel responses, and determining an angular velocity of the object from the time series of directional vectors and/or the corresponding time series of average phase differences.Type: GrantFiled: May 28, 2020Date of Patent: June 15, 2021Assignee: QUALCOMM IncorporatedInventors: Sanghoek Kim, Stephen Bennett, Ricky Keangpo Ho, Shi Cheng, Sohrab Emami, Ou Yang
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Patent number: 10897378Abstract: Disclosed wireless tunneling system includes two wireless tunneling apparatuses that communicate with each other through the wireless link. A local wireless tunneling apparatus is coupled to a local processing apparatus through a wired connection and a remote wireless tunneling apparatus is coupled to the remote processing apparatus through another wired connection. The two processing apparatuses bi-directionally communicate with each other through the wireless link using the two wireless tunneling apparatuses as if the two processing apparatuses were connected through a wired connection.Type: GrantFiled: August 29, 2018Date of Patent: January 19, 2021Assignee: Ubistar Technology, Inc.Inventors: Mark Graham Forbes, Shi Cheng, Dmitry Cherniavsky, Chinh Huy Doan, Sohrab Emami, Ricky Keangpo Ho, Nishit Kumar, Patrick Thomas McElwee, James R. Parker, Nitesh Singhal, Ron Zeng
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Patent number: 10809370Abstract: Various techniques are provided to efficiently detect the position and angular velocity of an object relative to a compact radar system including a transmitter antenna array and a receiver antenna array. In one example, a method includes repeatedly scanning a transmitter antenna array and a receiver antenna array of an object sensing system through a plurality of designated transmitter and receiver channels over a period of time to generate a time series of measured channel responses corresponding to each one of the designated channels, determining a time series of directional vectors to or from an object scanned by at least one of the designated channels, and/or a corresponding time series of average phase differences, based, at least in part, on the time series of measured channel responses, and determining an angular velocity of the object from the time series of directional vectors and/or the corresponding time series of average phase differences.Type: GrantFiled: July 22, 2016Date of Patent: October 20, 2020Assignee: QUALCOMM IncorporatedInventors: Sanghoek Kim, Stephen Bennett, Ricky Keangpo Ho, Shi Cheng, Sohrab Emami, Ou Yang
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Publication number: 20190028301Abstract: Disclosed wireless tunneling system includes two wireless tunneling apparatuses that communicate with each other through the wireless link. A local wireless tunneling apparatus is coupled to a local processing apparatus through a wired connection and a remote wireless tunneling apparatus is coupled to the remote processing apparatus through another wired connection. The two processing apparatuses bi-directionally communicate with each other through the wireless link using the two wireless tunneling apparatuses as if the two processing apparatuses were connected through a wired connection.Type: ApplicationFiled: August 29, 2018Publication date: January 24, 2019Inventors: Mark Graham Forbes, Shi Cheng, Dmitry Cherniavsky, Chinh Huy Doan, Sohrab Emami, Ricky Keangpo Ho, Nishit Kumar, Patrick Thomas McElwee, James R. Parker, Nitesh Singhal, Ron Zeng
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Patent number: 10091026Abstract: Disclosed wireless tunneling system includes two wireless tunneling apparatuses that communicate with each other through the wireless link. A local wireless tunneling apparatus is coupled to a local processing apparatus through a wired connection and a remote wireless tunneling apparatus is coupled to the remote processing apparatus through another wired connection. The two processing apparatuses bi-directionally communicate with each other through the wireless link using the two wireless tunneling apparatuses as if the two processing apparatuses were connected through a wired connection.Type: GrantFiled: March 17, 2016Date of Patent: October 2, 2018Assignee: Lattice Semiconductor CorporationInventors: Mark Graham Forbes, Shi Cheng, Dmitry Cherniavsky, Chinh Huy Doan, Sohrab Emami, Ricky Keangpo Ho, Nishit Kumar, Patrick Thomas McElwee, James R. Parker, Nitesh Singhal, Ron Zeng
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Patent number: 9780991Abstract: Aspects relate to correcting Inphase/Quadrature (I/Q) imbalances across multiple wireless elements such as multiple receive elements or multiple transmit elements. In one example implementation, I/Q imbalances can be corrected using a digital circuit provided within a digital portion of a direct conversion wireless element (upconversion or downconversion) that implements only two multiplications and one addition per pair of I and Q samples.Type: GrantFiled: January 6, 2016Date of Patent: October 3, 2017Assignee: QUALCOMM IncorporatedInventor: Ricky Keangpo Ho
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Publication number: 20160277212Abstract: Disclosed wireless tunneling system includes two wireless tunneling apparatuses that communicate with each other through the wireless link. A local wireless tunneling apparatus is coupled to a local processing apparatus through a wired connection and a remote wireless tunneling apparatus is coupled to the remote processing apparatus through another wired connection. The two processing apparatuses bi-directionally communicate with each other through the wireless link using the two wireless tunneling apparatuses as if the two processing apparatuses were connected through a wired connection.Type: ApplicationFiled: March 17, 2016Publication date: September 22, 2016Inventors: Mark Graham Forbes, Shi Cheng, Dmitry Cherniavsky, Chinh Huy Doan, Sohrab Emami, Ricky Keangpo Ho, Nishit Kumar, Patrick Thomas McElwee, James R. Parker, Nitesh Singhal, Ron Zeng
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Publication number: 20160197763Abstract: Aspects relate to correcting Inphase/Quadrature (I/Q) imbalances across multiple wireless elements such as multiple receive elements or multiple transmit elements. In one example implementation, I/Q imbalances can be corrected using a digital circuit provided within a digital portion of a direct conversion wireless element (upconversion or downconversion) that implements only two multiplications and one addition per pair of I and Q samples.Type: ApplicationFiled: January 6, 2016Publication date: July 7, 2016Inventor: Ricky Keangpo Ho
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Patent number: 9178735Abstract: A transmitting apparatus for generating a phase-modulated carrier signal with on-off keying (OOK) includes a coding circuitry for receiving binary digital data and generating an on-off keying (OOK) signal representing the binary digital data. The coding circuitry generates a phase modulation control signal for controlling a phase modulation of a millimeter wave carrier signal based on the on and off pattern of the OOK signal. The apparatus also includes a phase modulation circuitry for applying the phase modulation to the millimeter wave carrier signal based on the phase modulation control signal to generate a phase-modulated carrier signal, and a power amplifier for generating, based on the OOK signal and the phase-modulated carrier signal, an amplified phase-modulated carrier signal with OOK. The apparatus includes an interface to transmit the amplified phase-modulated carrier signal with OOK to a receiving apparatus via a millimeter wave communication link.Type: GrantFiled: July 23, 2014Date of Patent: November 3, 2015Assignee: Lattice Semiconductor CorporationInventors: Ricky Keangpo Ho, Shi Cheng
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Patent number: 7162163Abstract: A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled nonlinear phase noise compensator. The phase noise compensator reduces the nonlinear phase noise by applying a scaled differential signal strength estimate to estimated differential quadrature components or an estimated differential phase for providing a phase noise compensated representation.Type: GrantFiled: January 18, 2006Date of Patent: January 9, 2007Assignee: StrataLight Communications, Inc.Inventors: Keangpo Ho, Joseph Mardell Kahn
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Patent number: 7133620Abstract: A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled non-linear phase noise compensator. The phase noise compensator provides a phase noise compensated representation of a differential frequency by combining a measured differential frequency with a scaled differential signal strength estimate. The scale factor is derived from the number of spans in the transmission system.Type: GrantFiled: January 18, 2006Date of Patent: November 7, 2006Assignee: Stratalight Communication, Inc.Inventors: Keangpo Ho, Joseph Mardell Kahn
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Patent number: 7013089Abstract: A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled nonlinear phase noise compensator. The phase noise compensator reduces the nonlinear phase noise by rotating a phase estimate by a scaled signal strength estimate for the optical signal or by comparing a complex estimate of the optical signal to curved regions having scaled nonlinear decision boundaries. The scale factor is derived from the number of spans in the transmission system.Type: GrantFiled: April 30, 2004Date of Patent: March 14, 2006Assignee: StrataLight Communications, Inc.Inventors: Keangpo Ho, Joseph Mardell Kahn
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Patent number: 6915084Abstract: A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled nonlinear phase noise compensator. The phase noise compensator reduces the nonlinear phase noise by rotating a phase estimate by a scaled signal strength estimate for the optical signal or by comparing a complex estimate to curved regions having scaled nonlinear decision boundaries. The scale factor is derived from the number of spans in the transmission system. Another embodiment of the phase noise compensator uses the scaled signal strength for re-modulating an optical signal.Type: GrantFiled: September 3, 2002Date of Patent: July 5, 2005Assignee: StrataLight Communications, Inc.Inventors: Keangpo Ho, Joseph Mardell Kahn
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Publication number: 20040042802Abstract: A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled nonlinear phase noise compensator. The phase noise compensator reduces the nonlinear phase noise by rotating a phase estimate by a scaled signal strength estimate for the optical signal or by comparing a complex estimate to curved regions having scaled nonlinear decision boundaries. The scale factor is derived from the number of spans in the transmission system. Another embodiment of the phase noise compensator uses the scaled signal strength for re-modulating an optical signal.Type: ApplicationFiled: September 3, 2002Publication date: March 4, 2004Inventors: Keangpo Ho, Joseph Mardell Kahn
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Patent number: 6690894Abstract: Methods and apparatus are described to transmit and receive information encoded in multilevel optical signals that take on at least three intensity levels. Intensity levels of a transmitted multilevel optical signal are optimized to minimize a transmitted optical power required to achieve a specified decision error probability, taking account of an arbitrary admixture of impairments, including signal-dependent noise, signal-independent noise, a finite transmitter extinction ratio, and intersymbol interference. The optimizations described are implemented using analytical or numerical techniques, depending on the admixture of impairments, and can be used to achieve equal or unequal decision error probabilities at a set of decision thresholds.Type: GrantFiled: May 14, 2001Date of Patent: February 10, 2004Assignee: StrataLight Communications, Inc.Inventors: Keangpo Ho, Joseph Mardell Kahn
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Publication number: 20030223762Abstract: Methods and apparatus are described to transmit and receive information encoded in multilevel optical signals that take on at least three intensity levels. Intensity levels of a transmitted multilevel optical signal are optimized to minimize a transmitted optical power required to achieve a specified decision error probability, taking account of an arbitrary admixture of impairments, including signal-dependent noise, signal-independent noise, a finite transmitter extinction ratio, and intersymbol interference. The optimizations described are implemented using analytical or numerical techniques, depending on the admixture of impairments, and can be used to achieve equal or unequal decision error probabilities at a set of decision thresholds.Type: ApplicationFiled: May 14, 2001Publication date: December 4, 2003Inventors: Keangpo Ho, Joseph Mardell Kahn
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Patent number: 6592274Abstract: Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals are described. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information bits are encoded in a M-ary PAM symbol sequence, where M≧2. The PAM symbol sequence is input to a finite-state machine, which yields an encoded sequence that changes sign between two symbol intervals when the encoded sequence takes on a nominally zero value during an odd number of intervening symbol intervals. The encoded sequence is lowpass filtered and modulated onto an optical electric field. The receiver processes a received optical electric field to obtain an electrical signal proportional to the received optical intensity, and performs M-ary symbol-by-symbol decisions to recover the transmitted information bits, without potential error propagation.Type: GrantFiled: June 7, 2002Date of Patent: July 15, 2003Assignee: StrataLight Communications, Inc.Inventors: Joseph Mardell Kahn, Keangpo Ho
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Publication number: 20030011854Abstract: Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals are described. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information bits are encoded in a M-ary PAM symbol sequence, where M≧2. The PAM symbol sequence is input to a finite-state machine, which yields an encoded sequence that changes sign between two symbol intervals when the encoded sequence takes on a nominally zero value during an odd number of intervening symbol intervals. The encoded sequence is lowpass filtered and modulated onto an optical electric field. The receiver processes a received optical electric field to obtain an electrical signal proportional to the received optical intensity, and performs M-ary symbol-by-symbol decisions to recover the transmitted information bits, without potential error propagation.Type: ApplicationFiled: June 7, 2002Publication date: January 16, 2003Inventors: Joseph Mardell Kahn, Keangpo Ho
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Patent number: 6490069Abstract: Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information bits are encoded in a M-ary PAM symbol sequence, where M≳2. A subtraction-based encoder precodes and duobinary filters the M-ary PAM symbol sequence, yielding an encoded sequence. The encoded sequence is lowpass filtered and modulated onto an optical electric field. The receiver processes a received optical electric field to obtain an electrical signal proportional to the received optical intensity, and performs M-ary symbol-by-symbol decisions to recover the transmitted information bits, without potential error propagation.Type: GrantFiled: January 29, 2001Date of Patent: December 3, 2002Assignee: StrataLight Communications, Inc.Inventors: Joseph Mardell Kahn, Keangpo Ho
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Patent number: 6445476Abstract: Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals are described. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information bits are encoded in a M-ary PAM symbol sequence, where M≧3. The subsequence-based encoder decomposes the PAM symbol sequence into M1 subsequences, precodes each subsequence, performs duobinary filtering on each precoded subsequence, and forms a weighted sum of the duobinary precoded subsequences. The weighted sum of duobinary precoded subsequences is lowpass filtered and modulated onto an optical electric field. The receiver processes a received optical electric field to obtain an electrical signal proportional to the received optical intensity, and performs M-ary symbol-by-symbol decisions to recover the transmitted information bits, without potential error propagation.Type: GrantFiled: January 29, 2001Date of Patent: September 3, 2002Assignee: StrataLight Communications, Inc.Inventors: Joseph Mardell Kahn, Keangpo Ho