Patents by Inventor Hufei Zhu
Hufei Zhu 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: 10044401Abstract: Embodiments provide a signal processing method, a transmitter, and a compressive sampling receiving device. The method includes: obtaining a periodic pseudo random sequence used when a compressive sampling receiving device performs frequency mixing. The method also includes selecting 2N information symbols from N radio signals; determining a precoding matrix D according to the periodic pseudo random sequence. The method also includes using the precoding matrix to perform precoding processing on the 2N information symbols to obtain 2N precoding results. The method also includes separately transmitting the 2N precoding results to the compressive sampling receiving device by using the 2N carriers.Type: GrantFiled: December 29, 2016Date of Patent: August 7, 2018Assignee: Huawei Technologies Co., LtdInventor: Hufei Zhu
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Patent number: 9882581Abstract: The present invention relates to a compressive sensing-based signal processing method and apparatus. The method includes: determining distribution, of signal components of an input signal on which frequency mixing has been performed, in a baseband spectrum according to spectral distribution of the input signal; dividing the baseband spectrum according to different signal aliasing patterns formed by the distribution of the signal components, to form multiple frequency bands; determining lowest sampling frequency of the input signal according to the signal aliasing patterns in the frequency bands, and performing sampling on the input signal at sampling frequency greater than the lowest sampling frequency, to obtain a sampled signal; and separately restoring a corresponding signal component in each frequency band of the multiple frequency bands according to the sampled signal, and splicing the signal components restored in the frequency bands, to complete restoration of the input signal.Type: GrantFiled: September 20, 2016Date of Patent: January 30, 2018Assignee: Huawei Technologies Co., Ltd.Inventors: Xiangming Kong, Hufei Zhu
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Patent number: 9882530Abstract: The present disclosure provides a receiver and a signal processing method. The receiver includes: a first frequency mixer, performing frequency mixing on a received signal by using a square wave signal to obtain a first frequency-mixed signal; a first low-pass filter, filtering the first frequency-mixed signal to obtain a first filtered signal; a first analog-to-digital converter, performing analog-to-digital conversion on the first filtered signal to obtain a first sampled signal; and a signal processing unit, estimating, according to the first sampled signal, an information symbol transmitted by a transmit end, where the square wave signal is generated according to a carrier frequency estimation value of the received signal. The receiver according to embodiments of the present disclosure provides better flexibility.Type: GrantFiled: January 26, 2017Date of Patent: January 30, 2018Assignee: Huawei Technologies Co., Ltd.Inventor: Hufei Zhu
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Patent number: 9736776Abstract: A power save method, an AP device and an STA device are provided. According to whether power save is allowed in a current TXOP and whether a station STA is newly added in an operation object identifier of a subsequent frame of each frame of the current TXOP, the AP device respectively sets a TXOP power save indication of each frame, and when the TXOP power save indication of the current frame is power save allowed, the STA device determines whether to enter the Doze state according to a judgment result for a doze condition. The adoption of the method and the device can expand the power save application range, and enhance the power save effect.Type: GrantFiled: March 10, 2016Date of Patent: August 15, 2017Assignee: Huawei Technologies Co., Ltd.Inventors: Hufei Zhu, Yunbo Li
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Publication number: 20170141731Abstract: The present disclosure provides a receiver and a signal processing method. The receiver includes: a first frequency mixer, performing frequency mixing on a received signal by using a square wave signal to obtain a first frequency-mixed signal; a first low-pass filter, filtering the first frequency-mixed signal to obtain a first filtered signal; a first analog-to-digital converter, performing analog-to-digital conversion on the first filtered signal to obtain a first sampled signal; and a signal processing unit, estimating, according to the first sampled signal, an information symbol transmitted by a transmit end, where the square wave signal is generated according to a carrier frequency estimation value of the received signal. The receiver according to embodiments of the present disclosure provides better flexibility.Type: ApplicationFiled: January 26, 2017Publication date: May 18, 2017Inventor: Hufei ZHU
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Publication number: 20170111082Abstract: Embodiments provide a signal processing method, a transmitter, and a compressive sampling receiving device. The method includes: obtaining a periodic pseudo random sequence used when a compressive sampling receiving device performs frequency mixing. The method also includes selecting 2N information symbols from N radio signals; determining a precoding matrix D according to the periodic pseudo random sequence. The method also includes using the precoding matrix to perform precoding processing on the 2N information symbols to obtain 2N precoding results. The method also includes separately transmitting the 2N precoding results to the compressive sampling receiving device by using the 2N carriers.Type: ApplicationFiled: December 29, 2016Publication date: April 20, 2017Applicant: Huawei Technologies Co., Ltd.Inventor: Hufei Zhu
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Patent number: 9578658Abstract: An apparatus, method, and system to provide a backoff method and device used for a lower priority access category AC. The method includes: when the lower priority AC and another AC in a same station STA obtain a transmission opportunity TXOP at the same time and an internal collision occurs, detecting a TXOP sharing state of the lower priority AC; and executing backoff of the lower priority AC according to the detected TXOP sharing state.Type: GrantFiled: November 21, 2013Date of Patent: February 21, 2017Assignee: Huawei Technologies Co., Ltd.Inventors: Xun Yang, Yunbo Li, Tianyu Wu, Hufei Zhu
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Patent number: 9559760Abstract: The present invention discloses a method, device, and system for transmitting channel information, pertaining to the field of radio communication. The method for obtaining channel information includes: transmitting, by a beamformer, a request for obtaining channel information to a beamformee within the duration of a current first TXOP; receiving a null feedback frame transmitted by the beamformee within the duration of the current first TXOP; within the validity period of the channel information, if the beamformer obtains a second TXOP, transmitting, within the second TXOP, a channel information indication frame to request the channel information, and receiving the channel information transmitted by the beamformee. The system includes a beamformer and a beamformee. The present invention saves the signaling resources of the beamformer and reduces the power consumption of the beamformee.Type: GrantFiled: August 11, 2015Date of Patent: January 31, 2017Assignee: Huawei Technologies Co., Ltd.Inventors: Xun Yang, Yunbo Li, Tianyu Wu, Hufei Zhu
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Publication number: 20170012640Abstract: The present invention relates to a compressive sensing-based signal processing method and apparatus. The method includes: determining distribution, of signal components of an input signal on which frequency mixing has been performed, in a baseband spectrum according to spectral distribution of the input signal; dividing the baseband spectrum according to different signal aliasing patterns formed by the distribution of the signal components, to form multiple frequency bands; determining lowest sampling frequency of the input signal according to the signal aliasing patterns in the frequency bands, and performing sampling on the input signal at sampling frequency greater than the lowest sampling frequency, to obtain a sampled signal; and separately restoring a corresponding signal component in each frequency band of the multiple frequency bands according to the sampled signal, and splicing the signal components restored in the frequency bands, to complete restoration of the input signal.Type: ApplicationFiled: September 20, 2016Publication date: January 12, 2017Inventors: Xiangming KONG, Hufei ZHU
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Publication number: 20160205627Abstract: A power save method, an AP device and an STA device are provided. According to whether power save is allowed in a current TXOP and whether a station STA is newly added in an operation object identifier of a subsequent frame of each frame of the current TXOP, the AP device respectively sets a TXOP power save indication of each frame, and when the TXOP power save indication of the current frame is power save allowed, the STA device determines whether to enter the Doze state according to a judgment result for a doze condition. The adoption of the method and the device can expand the power save application range, and enhance the power save effect.Type: ApplicationFiled: March 10, 2016Publication date: July 14, 2016Inventors: Hufei ZHU, Yunbo LI
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Patent number: 9344317Abstract: An OFDM signal modulation method based on compressed sensing is provided, the method includes: acquiring a demodulation parameter of a receiver, where the demodulation parameter includes Tnyq of a periodic square signal of the receiver in sampling, Tnyq is a length of a minimum timeslot during which the periodic square signal maintains a high level or a low level; performing an OFDM modulation on an inputted information symbol to generate an OFDM baseband signal, and controlling a sampling interval TsampleOFDM=Ts/k of the OFDM baseband signal to be integral multiple of Tnyq, where Ts is a duration of valid data in the OFDM baseband signal, and k is the number of sub-carriers in the OFDM baseband signal; and up-converting the OFDM baseband signal and transmitting the processed signal to the receiver. Also provided are a demodulation method, device and system.Type: GrantFiled: November 17, 2015Date of Patent: May 17, 2016Assignee: Huawei Technologies Co., Ltd.Inventors: Hufei Zhu, Ganghua Yang
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Patent number: 9313737Abstract: A power save method, an AP device and an STA device are provided. According to whether power save is allowed in a current TXOP and whether a station STA is newly added in an operation object identifier of a subsequent frame of each frame of the current TXOP, the AP device respectively sets a TXOP power save indication of each frame, and when the TXOP power save indication of the current frame is power save allowed, the STA device determines whether to enter the Doze state according to a judgment result for a doze condition. The adoption of the method and the device can expand the power save application range, and enhance the power save effect.Type: GrantFiled: September 30, 2014Date of Patent: April 12, 2016Assignee: Huawei Technologies Co., Ltd.Inventors: Hufei Zhu, Yunbo Li
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Publication number: 20160072655Abstract: An OFDM signal modulation method based on compressed sensing is provided, the method includes: acquiring a demodulation parameter of a receiver, where the demodulation parameter includes Tnyq of a periodic square signal of the receiver in sampling, Tnyq is a length of a minimum timeslot during which the periodic square signal maintains a high level or a low level; performing an OFDM modulation on an inputted information symbol to generate an OFDM baseband signal, and controlling a sampling interval TsampleOFDM=Ts/k of the OFDM baseband signal to be integral multiple of Tnyq, where Ts is a duration of valid data in the OFDM baseband signal, and k is the number of sub-carriers in the OFDM baseband signal; and up-converting the OFDM baseband signal and transmitting the processed signal to the receiver. Also provided are a demodulation method, device and system.Type: ApplicationFiled: November 17, 2015Publication date: March 10, 2016Inventors: Hufei ZHU, Ganghua YANG
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Patent number: 9226238Abstract: A power save method, an AP device and an STA device are provided. According to whether power save is allowed in a current TXOP and whether a station STA is newly added in an operation object identifier of a subsequent frame of each frame of the current TXOP, the AP device respectively sets a TXOP power save indication of each frame, and when the TXOP power save indication of the current frame is power save allowed, the STA device determines whether to enter the Doze state according to a judgment result for a doze condition. The adoption of the method and the device can expand the power save application range, and enhance the power save effect.Type: GrantFiled: May 8, 2012Date of Patent: December 29, 2015Assignee: Huawei Technologies Co., Ltd.Inventors: Hufei Zhu, Yunbo Li
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Patent number: 9215034Abstract: A method includes determining a correlation between a first residual error and multiple columns in a sensing matrix according to a measured value of an original signal and the sensing matrix, and determining a first array most correlative to the measured value of the original signal in the sensing matrix according to the correlation between the first residual error and the multiple columns; determining a correlation between a kth residual error and the multiple columns according to a correlation between a (k?1)th residual error and the multiple columns, and determining a kth array most correlative to the measured value of the original signal according to the correlation between the kth residual error and the multiple columns in the sensing matrix, where 2?k?K; and recovering the original signal after determining a Kth array most correlative to the measured value of the original signal.Type: GrantFiled: November 26, 2014Date of Patent: December 15, 2015Assignee: Huawei Technologies Co., Ltd.Inventors: Hufei Zhu, Ganghua Yang
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Publication number: 20150349862Abstract: The present invention discloses a method, device, and system for transmitting channel information, pertaining to the field of radio communication. The method for obtaining channel information includes: transmitting, by a beamformer, a request for obtaining channel information to a beamformee within the duration of a current first TXOP; receiving a null feedback frame transmitted by the beamformee within the duration of the current first TXOP; within the validity period of the channel information, if the beamformer obtains a second TXOP, transmitting, within the second TXOP, a channel information indication frame to request the channel information, and receiving the channel information transmitted by the beamformee. The system includes a beamformer and a beamformee. The present invention saves the signaling resources of the beamformer and reduces the power consumption of the beamformee.Type: ApplicationFiled: August 11, 2015Publication date: December 3, 2015Inventors: Xun YANG, Yunbo LI, Tianyu WU, Hufei ZHU
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Patent number: 9203486Abstract: The present invention discloses a method, device, and system for transmitting channel information, pertaining to the field of radio communication. The method for obtaining channel information includes: transmitting, by a beamformer, a request for obtaining channel information to a beamformee within the duration of a current first TXOP; receiving a null feedback frame transmitted by the beamformee within the duration of the current first TXOP; within the validity period of the channel information, if the beamformer obtains a second TXOP, transmitting, within the second TXOP, a channel information indication frame to request the channel information, and receiving the channel information transmitted by the beamformee. The system includes a beamformer and a beamformee. The present invention saves the signaling resources of the beamformer and reduces the power consumption of the beamformee.Type: GrantFiled: November 22, 2013Date of Patent: December 1, 2015Assignee: Huawei Technologies Co., Ltd.Inventors: Xun Yang, Yunbo Li, Tianyu Wu, Hufei Zhu
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Patent number: 9167518Abstract: A power save method, an AP device and an STA device are provided. According to whether power save is allowed in a current TXOP and whether a station STA is newly added in an operation object identifier of a subsequent frame of each frame of the current TXOP, the AP device respectively sets a TXOP power save indication of each frame, and when the TXOP power save indication of the current frame is power save allowed, the STA device determines whether to enter the Doze state according to a judgment result for a doze condition. The adoption of the method and the device can expand the power save application range, and enhance the power save effect.Type: GrantFiled: May 8, 2012Date of Patent: October 20, 2015Assignee: Huawei Technologies Co., Ltd.Inventors: Hufei Zhu, Yunbo Li
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Publication number: 20150078489Abstract: A method includes determining a correlation between a first residual error and multiple columns in a sensing matrix according to a measured value of an original signal and the sensing matrix, and determining a first array most correlative to the measured value of the original signal in the sensing matrix according to the correlation between the first residual error and the multiple columns; determining a correlation between a kth residual error and the multiple columns according to a correlation between a (k?1)th residual error and the multiple columns, and determining a kth array most correlative to the measured value of the original signal according to the correlation between the kth residual error and the multiple columns in the sensing matrix, where 2?k?K; and recovering the original signal after determining a Kth array most correlative to the measured value of the original signal.Type: ApplicationFiled: November 26, 2014Publication date: March 19, 2015Inventors: Hufei Zhu, Ganghua Yang
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Publication number: 20150016327Abstract: A power save method, an AP device and an STA device are provided. According to whether power save is allowed in a current TXOP and whether a station STA is newly added in an operation object identifier of a subsequent frame of each frame of the current TXOP, the AP device respectively sets a TXOP power save indication of each frame, and when the TXOP power save indication of the current frame is power save allowed, the STA device determines whether to enter the Doze state according to a judgment result for a doze condition. The adoption of the method and the device can expand the power save application range, and enhance the power save effect.Type: ApplicationFiled: September 30, 2014Publication date: January 15, 2015Inventors: Hufei ZHU, Yunbo LI