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    Graph-based method for allocating resources in OFDMA networks
    2.
    发明授权
    Graph-based method for allocating resources in OFDMA networks 有权
    在OFDMA网络中分配资源的基于图形的方法

    公开(公告)号：US07907508B2

    公开(公告)日：2011-03-15

    申请号：US12112400

    申请日：2008-04-30

    申请人： Zhifeng Tao ,  Yu-Jung Chang ,  Jinyun Zhang

    发明人： Zhifeng Tao ,  Yu-Jung Chang ,  Jinyun Zhang

    IPC分类号： H04J11/00 ,  H04J1/00 ,  H04W40/00 ,  H04W72/00 ,  H04K1/10 ,  H04K1/02 ,  H03D1/04

    CPC分类号： H04L5/0032 ,  H04L5/0037 ,  H04L5/0058

    摘要： A method allocates radio channel resource in an orthogonal frequency-division multiple access network including a set of base stations (BS) and a set of mobile stations (MS). For each BS, a diversity set is maintained for the sets of MS. Each BS determines possible interference at the MS based on the diversity set. A graph is constructed, in which nodes represent the sets of MS, and each edge between a pair of nodes represents channel interference between the MS represented by the pair of nodes. A weight is assigned to each edge, which reflects interference and signal strength on the subchannel between the two MSs connected by the edge. Channel resources are allocated to the MS based on the graph.

    摘要翻译： 一种方法在包括一组基站（BS）和一组移动站（MS）的正交频分多址网络中分配无线电信道资源。 对于每个BS，为MS集合保持分集集合。 每个BS基于分集集确定MS处的可能干扰。 构建图，其中节点表示MS集合，并且一对节点之间的每个边缘表示由该对节点表示的MS之间的信道干扰。 权重分配给每个边缘，其反映由边缘连接的两个MS之间的子信道上的干扰和信号强度。 信道资源根据图表分配给MS。

    Graph-Based Method for Allocating Resources in OFDMA Networks
    3.
    发明申请
    Graph-Based Method for Allocating Resources in OFDMA Networks 有权
    基于图形的OFDMA网络资源分配方法

    公开(公告)号：US20090245085A1

    公开(公告)日：2009-10-01

    申请号：US12112346

    申请日：2008-04-30

    申请人： Zhifeng Tao ,  Yu-Jung Chang ,  Jinyun Zhang

    发明人： Zhifeng Tao ,  Yu-Jung Chang ,  Jinyun Zhang

    IPC分类号： H04J11/00

    CPC分类号： H04L5/0032 ,  H04L5/0037 ,  H04L5/0058

    摘要： A method allocates radio channel resources in an orthogonal frequency-division multiple access network including a set of base stations (BS) and a set of mobile stations (MS). For each BS, a diversity set is maintained for the sets of MS. Each BS determines possible interference at the MS based on the diversity set. A graph is constructed, in which nodes represent the sets of MS, mid each edge between a pair of nodes represents channel interference between the MS represented by the pair of nodes. A weight is assigned to each edge, which reflects interference between the two MSs connected by the edge. The interference graph is partitioned into non-overlapping clusters of nodes based on a structure of the interference graph, the potential interference, so that a sum of the weights of the edges between each cluster is maximized. Based upon the graph partitioning, the channel resources are allocated to the mobile stations in order to maximize the system capacity.

    摘要翻译： 一种方法在包括一组基站（BS）和一组移动站（MS）的正交频分多址网络中分配无线电信道资源。 对于每个BS，为MS集合保持分集集合。 每个BS基于分集集确定MS处的可能干扰。 构建了一个图，其中节点表示MS集合，一对节点之间的每个边中间表示由该对节点表示的MS之间的信道干扰。 权重被分配给每个边缘，其反映由边缘连接的两个MS之间的干扰。 基于干扰图的结构，潜在的干扰，干扰图被划分成不重叠的节点簇，使得每个簇之间的边的权重之和最大化。 基于图分割，将信道资源分配给移动台，以便最大化系统容量。

    Dynamic Radio Frequency Allocation for Base Station Cooperation with Interference Management
    7.
    发明申请
    Dynamic Radio Frequency Allocation for Base Station Cooperation with Interference Management 审中-公开
    基站与干扰管理的动态射频分配

    公开(公告)号：US20100081441A1

    公开(公告)日：2010-04-01

    申请号：US12241889

    申请日：2008-09-30

    申请人： Zhifeng Tao ,  Koon Hoo Teo ,  Yu-Jung Chang ,  Xuehong Mao

    发明人： Zhifeng Tao ,  Koon Hoo Teo ,  Yu-Jung Chang ,  Xuehong Mao

    IPC分类号： H04W72/00

    CPC分类号： H04W72/082

    摘要： A method allocates bandwidth from a radio frequency spectrum in a cellular network including a set of cells. Each cell includes a base station for serving a set of mobile stations in the cell. An area around each base station is partitioned into a center region and a boundary region. In each base station, bandwidth for use in the center region is reserved according to an inter-cell interference coordination (ICIC) protocol, and bandwidth for use in the boundary region is reserved according to the ICIC protocol and a base station cooperation (BSC) protocol. Then, the bandwidth is allocated to mobile stations as the mobile stations communicate with the base station in the center regions and the boundary regions according to the bandwidth reservations.

    摘要翻译： 一种方法从包括一组单元的蜂窝网络中的射频频谱中分配带宽。 每个小区包括用于服务小区中的一组移动站的基站。 每个基站周围的区域被划分为中心区域和边界区域。 在每个基站中，根据小区间干扰协调（ICIC）协议保留用于中心区域的带宽，根据ICIC协议和基站协作（BSC）保留边界区域中使用的带宽， 协议。 然后，随着移动站根据带宽预留在中心区域和边界区域与基站进行通信，将带宽分配给移动站。

    Method and apparatus for synchronization of the OFDM systems
    8.
    发明申请
    Method and apparatus for synchronization of the OFDM systems 有权
    用于OFDM系统的同步的方法和装置

    公开(公告)号：US20050105659A1

    公开(公告)日：2005-05-19

    申请号：US10833586

    申请日：2004-04-27

    申请人： Chorng-Ren Sheu ,  Meng-Chun Chang ,  Chia-Chi Huang ,  Yu-jung Chang

    发明人： Chorng-Ren Sheu ,  Meng-Chun Chang ,  Chia-Chi Huang ,  Yu-jung Chang

    IPC分类号： H04H1/00 ,  H04H20/72 ,  H04H40/27 ,  H04J11/00 ,  H04L7/02 ,  H04L27/26

    CPC分类号： H04H40/27 ,  H04H20/72 ,  H04L27/2662 ,  H04L27/2678

    摘要： A method and apparatus for the signal synchronization of an OFDM system are proposed including a delay conjugate multiplication module, a phase processor and an edge detector. It provides estimates for the boundaries of ISI-free region by utilizing the characteristics of the guard interval and combining the techniques of the delay conjugate multiplication module, phase differential operation, symbol-by-symbol average operation, and edge detection. This method provides an improved performance in a multi-path fading channel with large delay spread, and can be utilized in a broadcasting system, such as the DAB and DVB-T systems. This invention is easy to determine a fixed optimal threshold that can directly separate the ISI region in any mobile environment, thereby most symbol information with ISI-free version can be obtained.

    摘要翻译： 提出了一种用于OFDM系统的信号同步的方法和装置，包括延迟共轭乘法模块，相位处理器和边缘检测器。 它通过利用保护间隔的特性提供对无ISI区域的边界的估计，并结合延迟共轭乘法模块，相位差运算，符号符号平均运算和边缘检测技术。 该方法在具有大的延迟扩展的多径衰落信道中提供了改进的性能，并且可以在诸如DAB和DVB-T系统的广播系统中使用。 本发明容易确定可以在任何移动环境中直接分离ISI区域的固定最优阈值，从而可以获得具有无ISI版本的大多数符号信息。