Patents by Inventor Lihe Liu
Lihe Liu 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: 20130235915Abstract: Embodiments of the present invention relate to the field of communications and disclose a method and an apparatus for grouping line pairs, and a system, to solve a problem that obtaining a crosstalk cancellation coefficient matrix through channel training imposes a very high requirement on a system capability such as a computing capability and a storage capability and even affects user experience due to the relatively large number of line pairs in a large scale Vectored-DSL system. A technical solution provided in the present invention includes: acquiring crosstalk impact data between line pairs in a vectored-digital subscriber line Vectored-DSL system; and grouping line pairs, between which a crosstalk impact cannot be ignored, into one vector group according to a set threshold and the crosstalk impact data between the line pairs. The method and apparatus provided in the embodiments of the present invention are applicable to a large scale Vectored-DSL.Type: ApplicationFiled: April 22, 2013Publication date: September 12, 2013Applicant: Huawei Technologies Co., Ltd.Inventors: Xiang Wang, Lihe Liu, Cheng Li
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Patent number: 8406416Abstract: An apparatus comprising a transmitter configured to transmit a digital subscriber line (DSL) signal in a line from a plurality of subscriber lines according to a reference virtual noise power spectral density (PSD), wherein the reference virtual noise PSD is based on an upper bound for a worst-case far-end crosstalk (FEXT) PSD in the subscriber lines. Also included is an apparatus comprising at least one processor configured to implement a method comprising obtaining an upper bound for a worst-case FEXT PSD for a plurality of subscriber lines, obtaining a referred virtual noise PSD based on the worst-case FEXT PSD for the lines, and determining a bit-loading for the lines based on the referred virtual noise or a scaled version of the receiver-referred virtual noise.Type: GrantFiled: December 31, 2009Date of Patent: March 26, 2013Assignee: Futurewei Technologies, Inc.Inventors: Dong Wei, Lihe Liu
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Patent number: 8335275Abstract: A method, a device, and a system for managing lines are provided. The method includes: collecting showtime parameters of user lines (11); calculating crosstalk information of the user lines according to the collected showtime parameters (12); and grouping the user lines according to the calculated crosstalk information of the user lines (13). Thus, the dynamic spectrum management (DSM) algorithm is made to be more simple and faster, and the user lines are grouped more directly and exactly.Type: GrantFiled: June 25, 2010Date of Patent: December 18, 2012Assignee: Huawei Technologies Co., Ltd.Inventor: Lihe Liu
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Patent number: 8320526Abstract: The embodiments of the present invention disclose a spectrum optimization method and device and digital subscriber line system, the method comprising: calculating according to acquired information of each of respective subcarriers on the DSL line to be optimized to obtain optimized transmission power of a subcarrier to be optimized in a DSL line to be optimized; calculating a transmission rate of the DSL line to be optimized according to the optimized transmission power; and comparing the transmission rate with a target rate of the DSL line to be optimized, and if the transmission rate is less than the target rate, updating the information of an optimized subcarrier, and performing a recalculation.Type: GrantFiled: August 16, 2010Date of Patent: November 27, 2012Assignee: Huawei Technologies Co., Ltd.Inventors: Raphael Cendrillon, Liming Fang, Lihe Liu
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Publication number: 20120069853Abstract: An embodiment of the present disclosure provides a method for data acquisition. The method includes the following steps: transmitting a request message for acquiring line parameters to a central-office end access apparatus, and obtaining a time parameter T1 when the line parameter acquisition is started; receiving line parameter information reported by the central-office end access apparatus, and obtaining a time parameter T2 of a line; and comparing the time parameter T1 with the time parameter T2 of the line, and saving the received line parameter information if the time parameter T1 is larger than the time parameter T2 of the line. Embodiments of the present disclosure further provide an apparatus and a system for data acquisition.Type: ApplicationFiled: November 30, 2011Publication date: March 22, 2012Applicant: Huawei Technologies Co., LtdInventors: Lihe Liu, Jie Lv
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Patent number: 8000219Abstract: A method and apparatus for spectrum management in an xDSL system are disclosed. The method mainly include: determining a transmit PSD mask according to a crosstalk status of a line; performing IWF operation using the transmit PSD mask; and dynamically managing line spectrum according to the result of the IWF operation. Therefore, various embodiments of the present invention allow the DSLAM performance to approximate the OSM performance without the need for a center controller and with a rather simple algorithm in a severe crosstalk scenario. Moreover, the embodiments of the present invention may help to simply the design of DSLAM optimization system and achieve a proper balance between the DSLAM performance and the complexity.Type: GrantFiled: April 30, 2009Date of Patent: August 16, 2011Assignee: Huawei Technologies Co., Ltd.Inventors: Liming Fang, Lihe Liu
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Publication number: 20100303213Abstract: The embodiments of the present invention disclose a spectrum optimization method and device and digital subscriber line system, the method comprising: calculating according to acquired information of each of respective subcarriers on the DSL line to be optimized to obtain optimized transmission power of a subcarrier to be optimized in a DSL line to be optimized; calculating a transmission rate of the DSL line to be optimized according to the optimized transmission power; and comparing the transmission rate with a target rate of the DSL line to be optimized, and if the transmission rate is less than the target rate, updating the information of an optimized subcarrier, and performing a recalculation.Type: ApplicationFiled: August 16, 2010Publication date: December 2, 2010Applicant: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Raphael CENDRILLON, Liming FANG, Lihe LIU
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Publication number: 20100260282Abstract: A method, a device, and a system for managing lines are provided. The method includes: collecting showtime parameters of user lines (11); calculating crosstalk information of the user lines according to the collected showtime parameters (12); and grouping the user lines according to the calculated crosstalk information of the user lines (13). Thus, the dynamic spectrum management (DSM) algorithm is made to be more simple and faster, and the user lines are grouped more directly and exactly.Type: ApplicationFiled: June 25, 2010Publication date: October 14, 2010Inventor: Lihe Liu
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Publication number: 20100254528Abstract: An apparatus comprising a transmitter configured to transmit a digital subscriber line (DSL) signal in a line from a plurality of subscriber lines according to a reference virtual noise power spectral density (PSD), wherein the reference virtual noise PSD is based on an upper bound for a worst-case far-end crosstalk (FEXT) PSD in the subscriber lines. Also included is an apparatus comprising at least one processor configured to implement a method comprising obtaining an upper bound for a worst-case FEXT PSD for a plurality of subscriber lines, obtaining a referred virtual noise PSD based on the worst-case FEXT PSD for the lines, and determining a bit-loading for the lines based on the referred virtual noise or a scaled version of the receiver-referred virtual noise.Type: ApplicationFiled: December 31, 2009Publication date: October 7, 2010Applicant: Futurewei Technologies, Inc.Inventors: Dong Wei, Lihe Liu
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Publication number: 20090268601Abstract: A method and apparatus for spectrum management in an xDSL system are disclosed. The method mainly include: determining a transmit PSD mask according to a crosstalk status of a line; performing IWF operation using the transmit PSD mask; and dynamically managing line spectrum according to the result of the IWF operation. Therefore, various embodiments of the present invention allow the DSLAM performance to approximate the OSM performance without the need for a center controller and with a rather simple algorithm in a severe crosstalk scenario. Moreover, the embodiments of the present invention may help to simply the design of DSLAM optimization system and achieve a proper balance between the DSLAM performance and the complexity.Type: ApplicationFiled: April 30, 2009Publication date: October 29, 2009Applicant: Huawei Technologies Co., Ltd.Inventors: Liming Fang, Lihe Liu