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    Low-Complexity High-Performance Low-Rate Communications Codes
    52.
    发明申请
    Low-Complexity High-Performance Low-Rate Communications Codes 有权
    低复杂性高性能低速率通信代码

    公开(公告)号：US20080016426A1

    公开(公告)日：2008-01-17

    申请号：US11768585

    申请日：2007-06-26

    申请人： Kai Li ,  Guosen Yue ,  Xiaodong Wang ,  Mohammad Madihian

    发明人： Kai Li ,  Guosen Yue ,  Xiaodong Wang ,  Mohammad Madihian

    IPC分类号： H03M13/27

    CPC分类号： H03M13/1194 ,  H03M13/01 ,  H03M13/1111 ,  H03M13/1125 ,  H03M13/29 ,  H03M13/296 ,  H03M13/45

    摘要： An encoder includes an outer repetition encoder, an interleaver for permuting encoding from said outer repetition encoder; and an inner encoder for encoding information from the interleaver to provide a repeat zigzag-Hadamard code. In an exemplary embodiment, a common bit of a zigzag-Hadamard segment of encoding from said inner encoder is a repetition of a last parity bit of a previous zigzag-Hadamard segment of encoding from said inner encoder and said common bit is punctured.

    摘要翻译： 编码器包括外部重复编码器，用于从所述外部重复编码器排列编码的交织器; 以及内部编码器，用于对来自交织器的信息进行编码以提供重复锯齿形 - 哈达玛码。 在示例性实施例中，来自所述内部编码器的编码的锯齿形 - 哈达玛段的公共位是来自所述内部编码器的先前之字形 - 哈达玛编码段的最后奇偶校验位的重复，并且所述公共位被删截。

    Methods and apparatuses for detecting deviations from legitimate operation on a wireless network
    54.
    发明申请
    Methods and apparatuses for detecting deviations from legitimate operation on a wireless network 有权
    用于检测在无线网络上的合法操作的偏差的方法和装置

    公开(公告)号：US20070280187A1

    公开(公告)日：2007-12-06

    申请号：US11796499

    申请日：2007-04-26

    申请人： Xiaodong Wang ,  Alberto Lopez Toledo

    发明人： Xiaodong Wang ,  Alberto Lopez Toledo

    IPC分类号： H04Q7/24

    CPC分类号： H04W12/12 ,  H04L63/1416 ,  H04W74/08

    摘要： Methods and apparatuses for detecting deviations from legitimate operation on a wireless network. The method includes detecting a sequence of observable events related to operation of an entity in the wireless network, and determining from the detected sequence of observable events for a particular entity in the wireless network what number of idle slots occurred between two consecutive observable events to provide a first output. The method further includes obtaining a second output corresponding to the number of idle slots between two consecutive observable events for legitimate operation of any entity in the wireless network using the network transmission protocol, and comparing a function of the first output with a function of the second output to determine whether or not the particular entity is deviating from legitimate operation of the network transmission protocol.

    摘要翻译： 用于检测在无线网络上的合法操作的偏差的方法和装置。 该方法包括检测与无线网络中的实体的操作相关的可观察事件的序列，以及根据检测到的无线网络中的特定实体的可观察事件序列确定在两个连续可观察事件之间发生多少空闲时隙以提供 第一个输出。 所述方法还包括：使用所述网络传输协议获得对应于所述无线网络中的任何实体的合法操作的两个连续可观察事件之间的空闲时隙数量的第二输出，以及将所述第一输出的功能与所述第二输出的功能进行比较 输出以确定特定实体是否偏离网络传输协议的合法操作。

    Uplink Scheduler for Cellular Packet Access
    56.
    发明申请
    Uplink Scheduler for Cellular Packet Access 有权
    用于蜂窝分组接入的上行链路调度器

    公开(公告)号：US20070248035A1

    公开(公告)日：2007-10-25

    申请号：US11690936

    申请日：2007-03-26

    申请人： Aimin Sang ,  Xiaodong Wang ,  Mohammad Madihian

    发明人： Aimin Sang ,  Xiaodong Wang ,  Mohammad Madihian

    IPC分类号： H04B7/185

    CPC分类号： H04W72/1231 ,  H04W52/346 ,  H04W72/1268

    摘要： A method includes constraining total power received from cellular users accessing a base station through any one of a TDMA access, CDMA access, and a derivation of a TDMA/CDMA access, and scheduling users for access to the base station within the constrained total power in response to an optimization that for each time slot determines a group of time critical cellular users and their transmission power factoring in instantaneous location-dependent channel states and long term quality of service performance. In the preferred embodiment, the optimization includes an iterative solution of an NP-hard Knapsak problem with initialization of maximum transmit power per cellular user inversely proportional to at least one of an activity factor of a cellular user's channel, the cellular user's antenna gain, the instantaneous channel gain of a dedicated uplink channel for the cellular user, and other-cellular user to same-cellular user interference ratio, and directly proportional to total resource power consumption.

    摘要翻译： 一种方法包括通过TDMA接入，CDMA接入和TDMA / CDMA接入的导出来限制从蜂窝用户接入基站的总功率，并且在约束总功率内调度用户接入基站 响应优化，对于每个时隙，确定一组时间关键的蜂窝用户及其在瞬时位置相关信道状态下的传输功率因子和长期服务质量性能。 在优选实施例中，优化包括NP硬Hardathapsak问题的迭代解决方案，每个蜂窝用户的最大发射功率的初始化与蜂窝用户信道的活动因子，蜂窝用户的天线增益， 用于蜂窝用户的专用上行链路信道的瞬时信道增益，以及其他蜂窝用户对同一蜂窝用户干扰比，并且与总资源功率消耗成正比。

    Measurement-Based Admission Control For Wireless Packet Data Services
    57.
    发明申请
    Measurement-Based Admission Control For Wireless Packet Data Services 有权
    无线分组数据业务的基于测量的接纳控制

    公开(公告)号：US20070230335A1

    公开(公告)日：2007-10-04

    申请号：US11278154

    申请日：2006-03-31

    申请人： Aimin Sang ,  Xiaodong Wang ,  Mohammad Madihian

    发明人： Aimin Sang ,  Xiaodong Wang ,  Mohammad Madihian

    IPC分类号： H04L12/26

    CPC分类号： H04L47/801 ,  H04L47/10 ,  H04L47/15 ,  H04L47/70 ,  H04L47/808 ,  H04L47/822 ,  H04L47/823 ,  H04L47/824

    摘要： A call admission control technique is described which is well-suited for wireless systems providing real-time services over a shared downlink. The call admission control technique considers both multiplexing and multi-user diversity gain. The technique accurately determines the multi-user diversity gain by measuring per-user resource allocation and advantageously maximizes user accommodations under quality-of-service (QoS) as well as location-dependent resource availability constraints. In a further aspect, the call admission control technique is combined with delay-based scheduling, which effectively balances between system efficiency (channel exploitation) and user expectation (e.g., QoS). A system embodying the described call admission control and scheduling techniques can advantageously deliver efficient real-time services and remain robust to different load scenarios that vary according to system dynamics and/or user mobility.

    摘要翻译： 描述了一种适合于通过共享下行链路提供实时服务的无线系统的呼叫准入控制技术。 呼叫接纳控制技术考虑复用和多用户分集增益。 该技术通过测量每用户资源分配来准确地确定多用户分集增益，并有利地最大限度地提高了服务质量（QoS）以及位置相关资源可用性约束下的用户住宿。 在另一方面，呼叫接纳控制技术与基于延迟的调度相结合，其有效平衡系统效率（信道利用）和用户期望（例如，QoS）之间的平衡。 体现所描述的呼叫接纳控制和调度技术的系统可以有利地提供有效的实时服务，并且对于根据系统动态和/或用户移动性而变化的不同负载情况保持稳健。

    STRUCTURED CODEBOOK AND SUCCESSIVE BEAMFORMING FOR MULTIPLE-ANTENNA SYSTEMS
    59.
    发明申请
    STRUCTURED CODEBOOK AND SUCCESSIVE BEAMFORMING FOR MULTIPLE-ANTENNA SYSTEMS 有权
    用于多天线系统的结构化编码和连续波束

    公开(公告)号：US20070191066A1

    公开(公告)日：2007-08-16

    申请号：US11674330

    申请日：2007-02-13

    申请人： Mohammad Ali Khojastepour ,  Xiaodong Wang ,  Mohammad Madihian

    发明人： Mohammad Ali Khojastepour ,  Xiaodong Wang ,  Mohammad Madihian

    IPC分类号： H04B1/02 ,  H04M1/00 ,  H04B7/02

    CPC分类号： H04B7/0617 ,  H04B7/04 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0456 ,  H04B7/046 ,  H04B7/0486 ,  H04W52/42 ,  H04W88/02 ,  H04W88/08

    摘要： A quantized multi-rank beamforming scheme for multiple-antenna systems such as a multiple-input-multiple-output (MIMO) wireless downlink. User equipment (UE) estimates downlink channel and transmit power and determines rank and power allocations. A quantized beamforming matrix is then determined by the UE using successive beamforming. The UE also determines channel quality indices (CQI) which it feeds-back to the wireless downlink base station along with the index of the quantized beamforming matrix. The base station uses the CQI information to select a UE for scheduling of downlink transmission and the quantized beamforming matrix index received from the selected UE to beamform the downlink transmission to the UE. Base station overhead and is minimized while providing near-optimal performance given the constraints of a limited feed-back channel and computational complexity of the UE.

    摘要翻译： 用于多天线系统的量化多级波束成形方案，例如多输入多输出（MIMO）无线下行链路。 用户设备（UE）估计下行链路信道和发射功率，并确定等级和功率分配。 然后由UE使用连续的波束形成来确定量化的波束形成矩阵。 UE还确定其反馈到无线下行链路基站的信道质量指数（CQI）以及量化波束形成矩阵的索引。 基站使用CQI信息来选择用于下行链路传输的调度的UE和从所选择的UE接收的量化的波束成形矩阵索引来波束形成到UE的下行链路传输。 给定了有限的反馈信道和UE的计算复杂度的限制，基站开销被最小化，同时提供接近最佳的性能。

    JOINT SCHEDULING AND GROUPING FOR SDMA SYSTEMS
    60.
    发明申请
    JOINT SCHEDULING AND GROUPING FOR SDMA SYSTEMS 有权
    SDMA系统的联合调度和分组

    公开(公告)号：US20070105595A1

    公开(公告)日：2007-05-10

    申请号：US11554957

    申请日：2006-10-31

    申请人： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

    发明人： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

    IPC分类号： H04B1/02 ,  H04B1/06 ,  H04M1/00

    CPC分类号： H04B7/0697

    摘要： A joint scheduling and grouping technique for throughput maximization is disclosed for an uplink space-division multiple access (SDMA) system under proportional fairness constraints, when the receiver employs successive group decoding. We consider a slow-fading narrowband MIMO multiple access channel (MAC) in which multiple users, each equipped with multiple transmit antennas, communicate to a receiver equipped with multiple receive antennas. The users are unaware of the channel state information (CSI) whereas the receiver has perfect CSI and employs a successive group decoder (SGD). For an open-loop system, achievable outage probabilities are obtained for the case where an outage must be declared simultaneously for all users (common outage) as well as the case where outages can be declared individually for each user (individual outage). We then derive the optimum successive group decoder (OSGD) that simultaneously minimizes the common outage probability and the individual outage probability of each user, over all SGDs of permissible decoding complexity. For each channel realization, the OSGD is also shown to maximize the error exponent of the decodable set of users. An adaptive SGD is derived which not only retains the outage optimality of the OSGD but also minimizes the expected decoding complexity. Asymptotically tight (in the limit of high SNR) affine approximations are then obtained for the weighted sum common and individual outage capacities and the symmetric outage capacities. Limiting expressions for the relevant capacities as the number of users and the number of receive antennas approach infinity are also obtained and it is shown that the SGD yields symmetric capacity gains commensurate with the decoding complexity allowed. Simulation results with practical LDPC outer codes show that the OSGD offers significantly improved performance at low decoding complexity.

    摘要翻译： 当接收机采用连续的组解码时，在比例公平约束条件下，针对上行链路空分多址（SDMA）系统公开了用于吞吐量最大化的联合调度和分组技术。 我们考虑一个缓慢衰落的窄带MIMO多址信道（MAC），其中每个配备有多个发射天线的多个用户与配备有多个接收天线的接收机通信。 用户不知道信道状态信息（CSI），而接收机具有完美的CSI并采用连续的组解码器（SGD）。 对于开环系统，可以为所有用户（普通中断）同时声明中断以及为每个用户单独声明中断的情况（单独中断）的情况获得可实现的中断概率。 然后，我们导出最佳连续组解码器（OSGD），同时最小化每个用户的常见中断概率和单个中断概率，在所有SGD上允许的解码复杂度。 对于每个通道实现，OSGD还被显示为最大化可解码组用户的错误指数。 导出了一种自适应SGD，它不仅保留了OSGD的中断最优性，而且使预期的解码复杂度最小化。 然后，对于加权和公共和个别中断容量和对称中断容量，获得渐近紧密（在高SNR的极限）中的仿射近似。 还获得了用户数量和接收天线数量接近无穷大的相关容量的表达式，并且显示SGD产生与允许的解码复杂度相当的对称容量增益。 使用实际的LDPC外码的仿真结果表明，OSGD在低解码复杂度下提供了显着提高的性能。