Patents Assigned to Beijing University of Posts and Telecommunications
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Patent number: 9002011Abstract: The present invention discloses a method for generating a consistent cryptographic key based on wireless channel features.Type: GrantFiled: June 30, 2011Date of Patent: April 7, 2015Assignee: Beijing University of Posts and TelecommunicationsInventors: Yuexing Peng, Kan Zheng, Guangwei Li
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Patent number: 8917755Abstract: The present invention, pertaining to the field of mobile broadcast television technologies, discloses a method and apparatus for generating a broadcast positioning signal, and a positioning method. According to the present invention, a broadcast positioning signal is generated by inserting a spread spectrum signal and a first spread spectrum signal in an orthogonal frequency-division multiplexing (OFDM) signal, and a receiver is positioned according to broadcast positioning signals from at least three different senders.Type: GrantFiled: June 8, 2011Date of Patent: December 23, 2014Assignees: Beijing University of Posts and Telecommunications, Beijing Shoukexintong Science & Technology Co., Ltd.Inventors: Zhongliang Deng, Ziping Lv, Huli Shi, Weiguo Guan, Yanpei Yu, Hemin Li, Qifeng Lai, Yaoyu Deng, Wen Liu
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Publication number: 20140357296Abstract: The present invention, pertaining to the field of communications technologies, discloses a locating method and a locating system. The method includes: receiving a locating request and a locating feature parameter from a terminal, where the locating feature parameter is acquired by demodulating a locating spread spectrum signal inserted in a timeslot header or a transmission frame header of a mobile broadcast signal after the terminal receives the mobile broadcast signal; and locating the terminal by using a grid-based feature parameter matching algorithm according to the locating feature parameter. According to the present invention, a locating feature parameter that is acquired after a terminal demodulates a received mobile broadcast signal is received from the terminal; and the terminal is located by using a grid-based feature parameter matching algorithm according to the locating feature parameter.Type: ApplicationFiled: December 19, 2011Publication date: December 4, 2014Applicants: BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS, BEIJING SHOUKEXINTONG SCIENCE & TECHNOLOGY CO., LTDInventors: Zhongliang Deng, Ziping Lv, Huli Shi, Yanpei Yu, Xie Yuan, Risu Na, Hemin Li, Qifeng Lai, Lianming Xu
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Patent number: 8811147Abstract: A method for allocating downlink transmission power of coordinated transmission devices in coordinated multi-point transmission system includes the coordinated transmission devices receiving feedback of channel state information of sub-channels occupied by a terminal from the terminal. The channel state information includes channel phase information and channel amplitude information. Each of the coordinated transmission devices adjusts phases of their sending signals over its sub-channels respectively so as to make phase difference of the sending signals, which are received by the terminal from the coordinated transmission devices via a same sub-channel, to be minimal. Each of the coordinated transmission devices determines its power allocation proportions for the sub-channels on the basis of feedback of channel amplitude information from the terminal and the adjusted phases of the sending signals.Type: GrantFiled: July 20, 2012Date of Patent: August 19, 2014Assignee: Beijing University of Posts and TelecommunicationsInventors: Qimei Cui, Ping Zhang, Xiaofeng Tao, Bing Luo, Alexis Dowhuszko, Jyri Hamalainen
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Publication number: 20140205033Abstract: The present invention discloses a method for uplink multi-user cooperation communication, which is applied in a system at least including a first source node, a second source node and a target node, wherein there is a direct transmission link between either the first or the second source node and the target node.Type: ApplicationFiled: June 30, 2011Publication date: July 24, 2014Applicant: Beijing University of Posts and TelecommunicationsInventors: Kan Zheng, Hang Long, Fangxiang Wang
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Patent number: 8750405Abstract: A multi-antenna codebook selection modulation method for solving weak scattering is provided by the present invention. The method obtains higher diversity gain from a combination of multi-antenna codebook pre-coding and a rotation modulation solution by designing a new codebook selection rule. The present invention employs a design solution of designing a higher-order modulation diversity and space interleaver to obtain the higher diversity gain. In addition, the number of transmission antennas and the number of rotation modulation dimension can be set arbitrarily. However, the present invention takes the number Nt of transmission antennas to be equal to the number D of rotation modulation dimension in order to obtain higher diversity gain. In this way, the method evenly disperses signals of each dimension after D-dimensional rotation to each antenna through space interleaving technique, so that the signals of each dimension suffer different fading, thus enabling space diversity gain.Type: GrantFiled: April 15, 2011Date of Patent: June 10, 2014Assignee: Beijing University of Posts and TelecommunicationsInventors: Zhanji Wu, Liling Zhang, Wenbo Wang
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Publication number: 20140155079Abstract: The present invention relates to the technical field of wireless communication and of mobile communication, and more particularly to a method for spectrum resource allocation and interference avoidance of femtocell in a heterogeneous environment consisting of macro cell and femtocell, and specifically to a spectrum allocation method based on interference suppression and user difference bandwidth requirements. According to the spectrum allocation method based on interference suppression and user difference bandwidth requirements of the present invention, spectrum resource can be allocated reasonably according to the priority level of bandwidth requirements in combination with graph coloring algorithm and chromaticity preference algorithm.Type: ApplicationFiled: May 31, 2013Publication date: June 5, 2014Applicant: BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONSInventors: Xiaodong Xu, Xiaofeng Tao, Zhou Xu, Huixin Zhang, Ping Zhang
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Publication number: 20140140510Abstract: The present invention discloses a method for generating a consistent cryptographic key based on wireless channel features.Type: ApplicationFiled: June 30, 2011Publication date: May 22, 2014Applicant: Beijing University of Posts and TelecommunicationsInventors: Yuexing Peng, Kan Zheng, Guangwei Li
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Patent number: 8718160Abstract: The present invention provides an optical communication method, comprising: performing modulation on the obtained bit stream data to generate modulated signals; performing differential encoding on the modulated signals to generate differentially encoded signals; converting the differentially encoded signals into electrical signals; and mapping the electrical signals onto optical carriers to generate optical signals for transmission. With the present invention, it is possible to enhance the system's capability of resisting inter-carrier interference without decreasing spectrum efficiency, hence improving the tolerance of existing optical communication systems towards laser linewidth, fast-changing PMD, optical fiber nonlinearity, inter-channel interference and other damages, greatly enhancing system performances.Type: GrantFiled: April 19, 2012Date of Patent: May 6, 2014Assignee: Beijing University of Posts and TelecommunicationsInventors: Jian Wu, Hui Wang, Yan Li, Xiaobin Hong, Hongxiang Guo, Yong Zuo, Kun Xu, Wei Li, Jintong Lin
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Publication number: 20130343432Abstract: The present invention, pertaining to the field of mobile broadcast television technologies, discloses a method and apparatus for generating a broadcast positioning signal, and a positioning method. According to the present invention, a broadcast positioning signal is generated by inserting a spread spectrum signal and a first spread spectrum signal in an orthogonal frequency-division multiplexing (OFDM) signal, and a receiver is positioned according to broadcast positioning signals from at least three different senders.Type: ApplicationFiled: June 8, 2011Publication date: December 26, 2013Applicants: BEIJING SHOUKEXINTONG SCIENCE & TECHNOLOGY CO., LTD., BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONSInventors: Zhongliang Deng, Ziping Lv, Huli Shi, Weiguo Guan, Yanpei Yu, Hemin Li, Qifeng Lai, Yaoyu Deng, Wen Liu
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Publication number: 20130329650Abstract: A method for allocating downlink transmission power of coordinated transmission devices in coordinated multi-point transmission system includes the coordinated transmission devices receiving feedback of channel state information of sub-channels occupied by a terminal from the terminal. The channel state information includes channel phase information and channel amplitude information. Each of the coordinated transmission devices adjusts phases of their sending signals over its sub-channels respectively so as to make phase difference of the sending signals, which are received by the terminal from the coordinated transmission devices via a same sub-channel, to be minimal. Each of the coordinated transmission devices determines its power allocation proportions for the sub-channels on the basis of feedback of channel amplitude information from the terminal and the adjusted phases of the sending signals.Type: ApplicationFiled: July 20, 2012Publication date: December 12, 2013Applicant: Beijing University of Posts and TelecommunicationsInventors: Qimei Cui, Ping Zhang, Xiaofeng Tao, Bing Luo, Alexis Dowhuszko, Jyri Hamalainen
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Publication number: 20130324158Abstract: The present invention, pertaining to the field of wireless communications, discloses a mobile broadcast-based method and apparatus that includes: receiving a mobile broadcast signal; demodulating a location spreading signal inserted in the header of a time slot or a transmission frame of the mobile broadcast signal to acquire navigation message information, and measuring and acquiring location characteristic parameters, wherein the navigation message information includes the identifier of a mobile broadcast station, and the location characteristic parameters correspond to the identifier; and acquiring location data according to the location characteristic parameters and the navigation message information.Type: ApplicationFiled: June 8, 2011Publication date: December 5, 2013Applicants: BEIJING SHOUKEXINTONG SCIENCE & TECHNOLOGY CO., LTD., BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONSInventors: Zhongliang Deng, Lianming Xu, Yanpei Yu, Xie Yuan, Risu Na, Hemin Li, Qifeng Lai, Yaoyu Deng, Huli Shi, Ziping Lv
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Publication number: 20130308571Abstract: The present invention relates to the technical field of wireless communication, and discloses a method for frequency reuse based on cellular network. The method comprises the following steps: dividing the whole cellular network into a plurality of different cell clusters, wherein each cell cluster comprises three cells, every two of them being adjacent to each other; for each cell in a cell cluster, dividing the cell into a central area and an edge area according to the coverage of the cell; dividing the whole available frequency band of the network according to the user distribution and service distribution in the cell cluster; allocating divided frequency bands to the central area and the edge area in the cell cluster respectively according to preset rule; and applying the method for frequency reuse to other cell clusters, thus achieving the frequency reuse of the whole network.Type: ApplicationFiled: May 17, 2013Publication date: November 21, 2013Applicant: BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONSInventors: Xiaofeng Tao, Ping Zhang, Xiaona Li, Qimei Cui, Xiaodong Xu, Yingyue Xu, Waheed ur Rehman
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Publication number: 20130308570Abstract: The invention relates to the technical field of wireless communication, and provides a method for joint optimization of schedule and resource allocation based on a genetic algorithm, which is applied in a CoMP communication system. The method includes steps of: S1, encoding chromosome; S2, initializing setting; S3, computing fitness value; S4, determining whether the optimal solution is better than an elite: if yes, updating the elite and executing S5, and if no, turning to S5; S5, determining whether a predetermined generation of population has been generated or not, if no, executing S6, otherwise, turning to S8; S6, participating reproduction process to generate two offspring chromosome individuals; S7, determining whether a predetermined number of offspring chromosome individuals have been generated, if yes, turning to S3 to compute again; otherwise keeping on reproduction; S8, performing schedule and resource allocation according to a solution corresponding to the elite.Type: ApplicationFiled: May 17, 2013Publication date: November 21, 2013Applicant: BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONSInventors: Xiaodong Xu, Xiaofeng Tao, Da Wang, Qimei Cui, Ping Zhang, Xin Chen, Dezhuang Wu
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Publication number: 20130251058Abstract: A multi-antenna codebook selection modulation method for solving weak scattering is provided by the present invention. The method obtains higher diversity gain from a combination of multi-antenna codebook pre-coding and a rotation modulation solution by designing a new codebook selection rule. The present invention employs a design solution of designing a higher-order modulation diversity and space interleaver to obtain the higher diversity gain. In addition, the number of transmission antennas and the number of rotation modulation dimension can be set arbitrarily. However, the present invention takes the number Nt of transmission antennas to be equal to the number D of rotation modulation dimension in order to obtain higher diversity gain. In this way, the method evenly disperses signals of each dimension after D-dimensional rotation to each antenna through space interleaving technique, so that the signals of each dimension suffer different fading, thus enabling space diversity gain.Type: ApplicationFiled: April 15, 2011Publication date: September 26, 2013Applicant: BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONSInventors: Zhanji Wu, Liling Zhang, Wenbo Wang
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Publication number: 20130223272Abstract: Disclosed is a method for establishing a CoMP cooperating set in coordinated multi-point communication, the method comprising the steps of: triggering and starting a coordinated multi-point communication process; according to channel state information of all cells in a measurement cell set measured by a UE, determining a candidate CoMP cooperating set; sending a CoMP cooperating set establishment request to eNodeBs of the cooperating cells in the determined candidate CoMP cooperating set; the eNodeBs being of the cooperating cell and receiving the CoMP cooperating set establishment request responding to the CoMP cooperating set establishment request to the eNodeB of the serving cell of the UE, and sending a CoMP cooperating set establishment response to the eNodeB of the serving cell of the UE; the eNodeB of the serving cell of the UE determining a CoMP cooperating set of the UE according to information of the CoMP cooperating set establishment response; and according to a coordinated multi-point communicatioType: ApplicationFiled: October 27, 2011Publication date: August 29, 2013Applicant: BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONSInventors: Xiaofeng Tao, Xiaodong Xu, Qimei Cui, Ping Zhang, Xin Chen, Hongjia Li, Qiang Wang, Jie Ni
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Patent number: 8369863Abstract: An interference suppression method is provided. A method includes the following steps: determining, by a Femtocell, a set of Femtocells which generate interference with said Femtocell based on information measured by and feedbacked from subscribers which are served by said Femtocell, and delivering the cell IDs of all Femtocells in said set to a Femtocell gateway; establishing, by the Femtocell gateway, a relationship graph on interference among Femtocells according to information delivered from the Femtocells, and clustering the Femtocells based on said relationship graph; determining the range influenced by each Femtocell cluster; allocating resources to the Femtocells in each isolated cluster or in the range influenced by each cluster. It may ensure liable communications of Femtocell subscribers as possible, and/or may maximize spectrum efficiency and system capacity of the Femtocell layer as possible.Type: GrantFiled: May 4, 2012Date of Patent: February 5, 2013Assignee: Beijing University of Posts and TelecommunicationsInventors: Xiaodong Xu, Ping Zhang, Dan Hu, Hongjia Li, Yi Li, Xiaofeng Tao, Qimei Cui, Sai Wang, Qiang Wang
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Publication number: 20120309406Abstract: An interference suppression method is provided. A method includes the following steps: determining, by a Femtocell, a set of Femtocells which generate interference with said Femtocell based on information measured by and feedbacked from subscribers which are served by said Femtocell, and delivering the cell IDs of all Femtocells in said set to a Femtocell gateway; establishing, by the Femtocell gateway, a relationship graph on interference among Femtocells according to information delivered from the Femtocells, and clustering the Femtocells based on said relationship graph; determining the range influenced by each Femtocell cluster; allocating resources to the Femtocells in each isolated cluster or in the range influenced by each cluster. It may ensure liable communications of Femtocell subscribers as possible, and/or may maximize spectrum efficiency and system capacity of the Femtocell layer as possible.Type: ApplicationFiled: May 4, 2012Publication date: December 6, 2012Applicant: BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONSInventors: Xiaodong XU, Qimei CUI, Xiaofeng TAO, Qiang Wang, Ping ZHANG, Dan HU, Hongjia LI, Yi LI, Sai WANG
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Patent number: 8301736Abstract: A method for selecting and configuring network supernodes includes (i) in a first set period T1, each node, other than a control node in a network, regularly sending information on interactions between the node and other nodes to the control node; and (ii) in a second set period T2, the control node dividing the nodes into a plurality of node clusters according to the received information on interactions among the nodes and selecting supernodes from each node cluster, where each node belonging uniquely to a node cluster.Type: GrantFiled: March 24, 2010Date of Patent: October 30, 2012Assignee: Beijing University of Posts and TelecommunicationsInventors: Jianxin Liao, Jing Wang, Chun Wang, Wei Li, Li Wan, Xiaomin Zhu, Lei Zhang, Tong Xu, Lejian Zhang, Qiwei Shen, Limin Fan, Li Cheng
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Publication number: 20110128889Abstract: A method for selecting and configuring network supernodes including the following operational steps: in a first set period T1, each node other than the control node in a network sends information on interactions between the node and other nodes to the control node regularly; and in a second set period T2, the control node divides the nodes into a plurality of node clusters according to the received information on interactions among the nodes, and selects supernodes from each node cluster, each node belonging uniquely to a node cluster. The supernode selection according to the invention takes into account both performance and resource conditions of itself and interactions with other nodes. Therefore, when implementing control over other nodes in the node cluster to which it belongs, the selected supernode can find the corresponding node in a short time and shorten the searching time and path, thereby improving the working efficiency.Type: ApplicationFiled: March 24, 2010Publication date: June 2, 2011Applicant: Beijing University of Posts and TelecommunicationsInventors: Jianxin Liao, Jing Wang, Chun Wang, Wei Li, Li Wan, Xiaomin Zhu, Lei Zhang, Tong Xu, Lejian Zhang, Qiwei Shen, Limin Fan, Li Cheng