Patents by Inventor Chengzhi Zhou
Chengzhi Zhou 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: 11968064Abstract: Introduced here is at least one technique to better estimate interference at a receiver. The technique includes receiving a plurality of reference signals, which each have information indicative of noise. Thus, the technique further includes, for each reference signal, determining a noise estimation and determining a distance metric and log-likelihood ratio (LLR) of the noise estimation. Once the distance metric and LLR of each reference signal is determined, the receiver can determine a final LLR based on the distance metric and LLR of each reference signal. In this manner, a final LLR is determined. This technique can be applied by any device operating on MIMO technology.Type: GrantFiled: September 26, 2022Date of Patent: April 23, 2024Assignee: ZEKU TECHNOLOGY (SHANGHAI) CORP., LTD.Inventors: Jian Gu, Chengzhi Li, Hang Zhou, Bin Liu
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Patent number: 11956055Abstract: According to one aspect of the present disclosure, a baseband chip may be configured to receive a data stream associated with a channel. The baseband chip may be configured to select a first anchor point from the first constellation points of the first transmission layer. The baseband chip may be configured to select a first subset of constellation points from the first constellation points and the second constellation points. The baseband chip may be configured to perform a first iteration of a recursive tree search. The baseband chip may be configured to determine a first path metric based at least in part on the first iteration of the recursive tree search operation. The baseband chip may be configured to select a second anchor point from the second constellation points of the second transmission layer. The second anchor point may be associated with a second iteration of the recursive tree search.Type: GrantFiled: September 22, 2022Date of Patent: April 9, 2024Assignee: ZEKU TECHNOLOGY (SHANGHAI) CORP. LTD.Inventors: Bin Liu, Hang Zhou, Chengzhi Li, Jian Gu
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Patent number: 10594522Abstract: Methods and systems for impairment shifting may comprise receiving radio frequency (RF) signals in a receiver, downconverting the signals to baseband frequencies, and synchronizing the receiver to received signals. The frequency of a local oscillator (LO) may be adjusted to shift residual impairments to fall between desired baseband signals where they are least visible. The received RF signals may comprise analog, satellite, or cable, television signals. The LO frequency may be adjusted to configure the DC offset impairments to fall between luminance and chrominance harmonics. The LO frequency may be adjusted to configure I/Q imbalanced impairments from residual in-phase and quadrature mismatch of a picture carrier signal to fall about 300 kHz from a sound carrier signal in the analog television signals. The LO frequency may be adjusted to configure the I/Q imbalanced impairments from residual I/Q mismatch of a sound carrier signal to fall between luminance and chrominance harmonics.Type: GrantFiled: December 31, 2018Date of Patent: March 17, 2020Assignee: Maxlinear, Inc.Inventors: Chengzhi Zhou, Shuang Yu
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Publication number: 20190140870Abstract: Methods and systems for impairment shifting may comprise receiving radio frequency (RF) signals in a receiver, downconverting the signals to baseband frequencies, and synchronizing the receiver to received signals. The frequency of a local oscillator (LO) may be adjusted to shift residual impairments to fall between desired baseband signals where they are least visible. The received RF signals may comprise analog, satellite, or cable, television signals. The LO frequency may be adjusted to configure the DC offset impairments to fall between luminance and chrominance harmonics. The LO frequency may be adjusted to configure I/Q imbalanced impairments from residual in-phase and quadrature mismatch of a picture carrier signal to fall about 300 kHz from a sound carrier signal in the analog television signals. The LO frequency may be adjusted to configure the I/Q imbalanced impairments from residual I/Q mismatch of a sound carrier signal to fall between luminance and chrominance harmonics.Type: ApplicationFiled: December 31, 2018Publication date: May 9, 2019Inventors: Chengzhi Zhou, Shuang Yu
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Patent number: 10177946Abstract: A method and system for impairment shifting is disclosed and may include receiving one or more radio frequency (RF) analog television signals in a receiver of a communication device, downconverting the received one or more received RF analog television signals to baseband frequencies, synchronizing the receiver to the one or more received RF analog television signals, and adjusting a frequency of one or more local oscillators in the receiver to configure in-phase/quadrature (I/Q) mismatch of a picture carrier signal to fall near a sound carrier signal in the received RF analog television signals. The frequency of the one or more local oscillators may be adjusted to configure a DC offset impairment to fall between luminance and chrominance harmonics at baseband in the analog television signals. I/Q imbalanced impairments may be configured with about 300 kHz separation from the sound carrier signal.Type: GrantFiled: September 30, 2015Date of Patent: January 8, 2019Assignee: Maxlinear, Inc.Inventors: Chengzhi Zhou, Shuang Yu
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Publication number: 20160028563Abstract: A method and system for impairment shifting is disclosed and may include receiving one or more radio frequency (RF) analog television signals in a receiver of a communication device, downconverting the received one or more received RF analog television signals to baseband frequencies, synchronizing the receiver to the one or more received RF analog television signals, and adjusting a frequency of one or more local oscillators in the receiver to configure in-phase/quadrature (I/Q) mismatch of a picture carrier signal to fall near a sound carrier signal in the received RF analog television signals. The frequency of the one or more local oscillators may be adjusted to configure a DC offset impairment to fall between luminance and chrominance harmonics at baseband in the analog television signals. I/Q imbalanced impairments may be configured with about 300 kHz separation from the sound carrier signal.Type: ApplicationFiled: September 30, 2015Publication date: January 28, 2016Inventors: Chengzhi Zhou, Shuang Yu
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Patent number: 9160390Abstract: Methods and systems for impairment shifting may comprise receiving radio frequency (RF) signals in a receiver, downconverting the signals to baseband frequencies, and synchronizing the receiver to received signals. The frequency of a local oscillator (LO) may be adjusted to shift residual impairments to fall between desired baseband signals where they are least visible. The received RF signals may comprise analog, satellite, or cable, television signals. The LO frequency may be adjusted to configure the DC offset impairments to fall between luminance and chrominance harmonics. The LO frequency may be adjusted to configure I/Q imbalanced impairments from residual in-phase and quadrature mismatch of a picture carrier signal to fall about 300 kHz from a sound carrier signal in the analog television signals. The LO frequency may be adjusted to configure the I/Q imbalanced impairments from residual I/Q mismatch of a sound carrier signal to fall between luminance and chrominance harmonics.Type: GrantFiled: February 13, 2012Date of Patent: October 13, 2015Assignee: Maxlinear, Inc.Inventors: Chengzhi Zhou, Shuang Yu
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Patent number: 9077936Abstract: A filter for processing a digital TV composite signal having a video component and an audio component includes a digital video filter and a digital audio filter. The digital video filter includes a lowpass finite impulse response (FIR) filter, an up-mixer, an asymmetric filter for compensating a Nyquist slope of the video component, and a down-mixer connected in this order. The digital audio filter includes an audio down-mixer, a decimated FIR filter, an enhancing FIR filter, an interpolated FIR filter, and an audio up-mixer. These components are connected in series. Optionally, the decimating FIR filter is decimated by an integer decimation factor M, and the interpolated FIR filter is interpolated by an integer factor N. The integer M and N may have the same value.Type: GrantFiled: November 22, 2010Date of Patent: July 7, 2015Assignee: MaxLinear, Inc.Inventors: Chengzhi Zhou, Curtis Ling
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Publication number: 20130088647Abstract: Methods and systems for impairment shifting may comprise receiving radio frequency (RF) signals in a receiver, downconverting the signals to baseband frequencies, and synchronizing the receiver to received signals. The frequency of a local oscillator (LO) may be adjusted to shift residual impairments to fall between desired baseband signals where they are least visible. The received RF signals may comprise analog, satellite, or cable, television signals. The LO frequency may be adjusted to configure the DC offset impairments to fall between luminance and chrominance harmonics. The LO frequency may be adjusted to configure I/Q imbalanced impairments from residual in-phase and quadrature mismatch of a picture carrier signal to fall about 300 kHz from a sound carrier signal in the analog television signals. The LO frequency may be adjusted to configure the I/Q imbalanced impairments from residual I/Q mismatch of a sound carrier signal to fall between luminance and chrominance harmonics.Type: ApplicationFiled: February 13, 2012Publication date: April 11, 2013Inventors: Chengzhi Zhou, Shuang Yu
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Publication number: 20110285912Abstract: A filter for processing a digital TV composite signal having a video component and an audio component includes a digital video filter and a digital audio filter. The digital video filter includes a lowpass finite impulse response (FIR) filter, an up-mixer, an asymmetric filter for compensating a Nyquist slope of the video component, and a down-mixer connected in this order. The digital audio filter includes an audio down-mixer, a decimated FIR filter, an enhancing FIR filter, an interpolated FIR filter, and an audio up-mixer. These components are connected in series. Optionally, the decimating FIR filter is decimated by an integer decimation factor M, and the interpolated FIR filter is interpolated by an integer factor N. The integer M and N may have the same value.Type: ApplicationFiled: November 22, 2010Publication date: November 24, 2011Applicant: MaxLinear, Inc.Inventors: Chengzhi Zhou, Curtis Ling