Patents by Inventor Chunhua Sun
Chunhua Sun 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: 11984666Abstract: An object of the present disclosure is to provide a radiation element and a bandwidth extension structure. The radiation element according to the present disclosure comprises: a basic radiation element and one or more bandwidth extension structures; wherein the one or more bandwidth extension structures are mounted on the basic radiation element to extend the operating bandwidth of the basic radiation element. The bandwidth extension structure according to the present disclosure is mounted on the basic radiation element to extend the operating band of the basic radiation element.Type: GrantFiled: November 2, 2018Date of Patent: May 14, 2024Assignee: RFS Technologies, Inc.Inventors: Jiankai Xu, Ke Chen, Chunhua Zhou, Jing Liu, Jihong Sun
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Patent number: 11206167Abstract: A method of performing carrier frequency offset (CFO) estimation and/or time offset (TO) estimation at a radio equipment in a mobile communications system. The method allows, for each of a plurality of synchronization signal (SS) blocks (SSBs) in a SS Burst detected at said radio equipment, determining a CFO estimation and/or a TO estimation based on network information signal prediction. The method includes selecting at least some of said detected SSBs in said SSB Burst and combining the CFO estimations and/or the TO estimations to obtain improved CFO compensation and/or TO compensation for signal processing at said radio equipment.Type: GrantFiled: June 8, 2020Date of Patent: December 21, 2021Assignee: Hong Kong Applied Science and Technology Research Institute Company LimtedInventors: Haiming Zhang, Eddy Chiu, Man-Wai Kwan, Ho Yin Chan, Chunhua Sun, Kong Chau Tsang
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Patent number: 9949226Abstract: A system comprising beacon-generating clusters for enabling a mobile computing device to perform location or proximity determination is provided. Each cluster comprises a primary station for broadcasting a primary beacon, and an offset-assisted station, positioned from the primary station by an offset distance along a direction, for broadcasting a secondary beacon. The offset distance and the direction are unique for all the clusters, causing a jittering area, within which the mobile computing device is unable to determine which one of adjacent primary stations is closer to from detecting the primary beacons, to be reduced by further utilizing the secondary beacons provided by the clusters. Fluctuation in received signal strength indicator (RSSI) can be reduced by having each station, primary or secondary, installed with multiple co-located broadcasting units for utilizing space and time diversity to reduce RSSI fluctuation. In another option, multiple offset-assisted stations are used for each cluster.Type: GrantFiled: October 5, 2016Date of Patent: April 17, 2018Assignee: Hong Kong Applied Science and Technology Research Institute Company LimitedInventors: Chunhua Sun, Xinyi Liu, Eddy Chiu
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Publication number: 20180098301Abstract: A system comprising beacon-generating clusters for enabling a mobile computing device to perform location or proximity determination is provided. Each cluster comprises a primary station for broadcasting a primary beacon, and an offset-assisted station, positioned from the primary station by an offset distance along a direction, for broadcasting a secondary beacon. The offset distance and the direction are unique for all the clusters, causing a jittering area, within which the mobile computing device is unable to determine which one of adjacent primary stations is closer to from detecting the primary beacons, to be reduced by further utilizing the secondary beacons provided by the clusters. Fluctuation in received signal strength indicator (RSSI) can be reduced by having each station, primary or secondary, installed with multiple co-located broadcasting units for utilizing space and time diversity to reduce RSSI fluctuation. In another option, multiple offset-assisted stations are used for each cluster.Type: ApplicationFiled: October 5, 2016Publication date: April 5, 2018Inventors: Chunhua SUN, Xinyi LIU, Eddy CHIU
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Patent number: 9426677Abstract: The present invention provides a method, a device, and a system for optimizing a tradeoff between capacity and coverage of a network. The method includes: receiving statistical information and a first count that are sent by a base station; establishing at least one coverage cluster; calculating cluster values of all the coverage clusters; acquiring an entire-network coverage hole (CH) value and an entire-network coverage overlap (CO) value; calculating an entire-network utility value according to the entire-network CH value and the entire-network CO value; if the capacity or coverage weight and the antenna downtilt of each base station in all the coverage clusters need to be adjusted, acquiring an adjustment value for the capacity or coverage weight of each base station and an adjustment value for the antenna downtilt of each base station according to an optimization strategy, and sending the adjustment values to a corresponding base station.Type: GrantFiled: October 31, 2014Date of Patent: August 23, 2016Assignee: Huawei Technologies Co., Ltd.Inventors: Chunhua Sun, Hongcheng Zhuang, Jietao Zhang
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Publication number: 20150057005Abstract: The present invention provides a method, a device, and a system for optimizing a tradeoff between capacity and coverage of a network. The method includes: receiving statistical information and a first count that are sent by a base station; establishing at least one coverage cluster; calculating cluster values of all the coverage clusters; acquiring an entire-network coverage hole (CH) value and an entire-network coverage overlap (CO) value; calculating an entire-network utility value according to the entire-network CH value and the entire-network CO value; if the capacity or coverage weight and the antenna downtilt of each base station in all the coverage clusters need to be adjusted, acquiring an adjustment value for the capacity or coverage weight of each base station and an adjustment value for the antenna downtilt of each base station according to an optimization strategy, and sending the adjustment values to a corresponding base station.Type: ApplicationFiled: October 31, 2014Publication date: February 26, 2015Inventors: Chunhua Sun, Hongcheng Zhuang, Jietao Zhang
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Patent number: 8774111Abstract: Systems, methods, and computer-readable media for a fair and efficient channel allocation and spectrum sensing for cognitive transmission in wireless networks are presented herein. A base station can send a cognitive user device a request to sense an idle channel associated with a primary network, and in response to receiving a willingness indicator or an attribute from the cognitive user device and/or a number of idle channels associated with the primary network sensed by the cognitive user device, the base station can assign the cognitive user device to transmit data on the idle channel associated with the primary network.Type: GrantFiled: January 3, 2012Date of Patent: July 8, 2014Assignee: Dynamic Invention LLCInventors: Chunhua Sun, Wei Chen, Khaled Ben Letaief
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Patent number: 8655283Abstract: Cluster-based cooperative spectrum sensing is provided for cognitive radio systems. For each cluster of cognitive users, a cluster head is determined. Each cluster head collects energies of a reporting channel measured by the cognitive users within the cluster and decides whether a primary user is absent from a given spectrum. A common receiver then aggregates the cluster-level decisions made by the cluster heads, and makes a decision across multiple, or all of, the clusters whether the primary user is absent based on a fusion function of the cluster-level decisions. If the primary (licensed) user is absent, then secondary (unlicensed) users may utilize the spectrum.Type: GrantFiled: April 4, 2008Date of Patent: February 18, 2014Assignee: Lingna Holdings Pte., LLCInventors: Chunhua Sun, Wei Zhang, Khaled Ben Letaief
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Publication number: 20120281643Abstract: Systems, methods, and computer-readable media for a fair and efficient channel allocation and spectrum sensing for cognitive transmission in wireless networks are presented herein. A base station can send a cognitive user device a request to sense an idle channel associated with a primary network, and in response to receiving a willingness indicator or an attribute from the cognitive user device and/or a number of idle channels associated with the primary network sensed by the cognitive user device, the base station can assign the cognitive user device to transmit data on the idle channel associated with the primary network.Type: ApplicationFiled: January 3, 2012Publication date: November 8, 2012Applicant: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGYInventors: Chunhua Sun, Wei Chen, Khaled Ben Letaief
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Publication number: 20080261639Abstract: Cluster-based cooperative spectrum sensing is provided for cognitive radio systems. For each cluster of cognitive users, a cluster head is determined. Each cluster head collects energies of a reporting channel measured by the cognitive users within the cluster and decides whether a primary user is absent from a given spectrum. A common receiver then aggregates the cluster-level decisions made by the cluster heads, and makes a decision across multiple, or all of, the clusters whether the primary user is absent based on a fusion function of the cluster-level decisions. If the primary (licensed) user is absent, then secondary (unlicensed) users may utilize the spectrum.Type: ApplicationFiled: April 4, 2008Publication date: October 23, 2008Applicant: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGYInventors: Chunhua Sun, Wei Zhang, Khaled Ben Letaief