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147 条记录 (耗时 0.044 秒)

    Method and system for switching antenna and channel assignments in broadband wireless networks
    23.
    发明授权
    Method and system for switching antenna and channel assignments in broadband wireless networks 有权
    宽带无线网络切换天线和信道分配的方法和系统

    公开(公告)号：US08797970B2

    公开(公告)日：2014-08-05

    申请号：US12498924

    申请日：2009-07-07

    申请人： Guanbin Xing ,  Manyuan Shen ,  Hui Liu

    发明人： Guanbin Xing ,  Manyuan Shen ,  Hui Liu

    IPC分类号： H04W4/00

    CPC分类号： H04L5/06 ,  H04B7/0452 ,  H04B7/0613 ,  H04B17/24 ,  H04B17/382 ,  H04L5/023 ,  H04L27/261 ,  H04W28/18 ,  H04W48/16 ,  H04W72/04 ,  H04W72/0453 ,  H04W72/085

    摘要： A method and apparatus for antenna switching, grouping, and channel assignments in wireless communication systems. The invention allows multiuser diversity to be exploited with simple antenna operations, therefore increasing the capacity and performance of wireless communications systems. Channel characteristics indicative of signal reception quality for downlink or bi-directional traffic for each channel/antenna resource combination are measured or estimated at a subscriber. Corresponding channel characteristic information is returned to the base station. Channel characteristics information may also be measured or estimated for uplink or bi-directional signals received at each of multiple receive antenna resources. The base station employs channel allocation logic to assign uplink, downlink and/or bi-directional channels for multiple subscribers based on channel characteristics measured and/or estimated for the uplink, downlink and/or bi-directional channels.

    摘要翻译： 一种用于无线通信系统中的天线切换，分组和信道分配的方法和装置。 本发明允许利用简单的天线操作来利用多用户分集，从而增加无线通信系统的容量和性能。 指示用于每个信道/天线资源组合的下行链路或双向业务的信号接收质量的信道特性在用户处被测量或估计。 相应的信道特征信息返回给基站。 还可以对在多个接收天线资源中的每一个处接收的上行链路或双向信号测量或估计信道特性信息。 基站采用信道分配逻辑以基于针对上行链路，下行链路和/或双向信道测量和/或估计的信道特性为多个用户分配上行链路，下行链路和/或双向信道。

    Systems and methods for rapid uplink air interface synchronization
    26.
    发明授权
    Systems and methods for rapid uplink air interface synchronization 失效
    快速上行链路空中接口同步的系统和方法

    公开(公告)号：US08259777B2

    公开(公告)日：2012-09-04

    申请号：US11651239

    申请日：2007-01-09

    申请人： Xuan Li ,  Manyuan Shen ,  Guanbin Xing

    发明人： Xuan Li ,  Manyuan Shen ,  Guanbin Xing

    IPC分类号： H04B1/00

    CPC分类号： H04L27/2655 ,  H04L5/023 ,  H04L27/261 ,  H04L27/2662 ,  H04W52/08 ,  H04W52/146 ,  H04W52/42

    摘要： Rapid uplink synchronization is enabled by reducing a 2D search problem to two 1D search problems, which can generally be performed in less time. Advantage is taken of fact that a mobile device sends a ranging code on multiple sub-carriers. Using the assumption that adjacent sub-carriers will have approximately equivalent channel characteristics, phase ambiguity can be removed by differentially combining pairs of adjacent sub-carriers. Once the phase ambiguity is removed, the code, timing, and power level may be determined relatively quickly. In one embodiment, the values of correlations between received signals and possible codes are compared with a threshold.

    摘要翻译： 通过将2D搜索问题减少到两个1D搜索问题来实现快速上行链路同步，这通常可以在更短的时间内执行。 优点在于移动设备在多个子载波上发送测距码。 使用相邻子载波将具有近似等效信道特性的假设，可以通过差分地组合相邻副载波对来消除相位模糊度。 一旦去除相位模糊度，可以相对快速地确定代码，定时和功率水平。 在一个实施例中，将接收信号与可能代码之间的相关值与阈值进行比较。

    AUTOMATIC GAIN CONTROL METHOD AND APPARATUS FOR WIRELESS COMMUNICATION SYSTEMS
    27.
    发明申请
    AUTOMATIC GAIN CONTROL METHOD AND APPARATUS FOR WIRELESS COMMUNICATION SYSTEMS 失效
    自动增益控制方法和无线通信系统的设备

    公开(公告)号：US20110311006A1

    公开(公告)日：2011-12-22

    申请号：US13220401

    申请日：2011-08-29

    申请人： Haitao Wang

    发明人： Haitao Wang

    IPC分类号： H04L27/08

    CPC分类号： H04L27/3809 ,  H03G3/3036 ,  H03G3/3052 ,  H04L1/0003

    摘要： A system and method are provided for automatic gain control (AGC) using an adaptive reference and a threshold. An adaptive reference allows for adjusting the target power based on variations in operating parameters and conditions, such as a change to a modulation schemes which requires a different signal to noise ratio (SNR) to maintain performance. A gain adjustment threshold allows for rapid AGC response while reducing the potential effects of hysterisis. AGC levels may be changed during symbol prefixes or suffixes, and avoided during a data portion of a signal. Embodiments allow for symbol-by symbol AGC changes in OFDM, OFDMA, and TDD systems.

    摘要翻译： 提供了一种使用自适应参考和阈值进行自动增益控制（AGC）的系统和方法。 自适应参考允许基于操作参数和条件的变化来调整目标功率，例如需要不同信噪比（SNR）以维持性能的调制方案的改变。 增益调整阈值允许快速AGC响应，同时减少滞后的潜在影响。 AGC电平可以在符号前缀或后缀期间改变，并且在信号的数据部分期间被避免。 实施例允许OFDM，OFDMA和TDD系统中的逐符号AGC改变。

    System and method for managing wireless base station handoff information
    28.
    发明授权
    System and method for managing wireless base station handoff information 失效
    用于管理无线基站切换信息的系统和方法

    公开(公告)号：US08036173B2

    公开(公告)日：2011-10-11

    申请号：US11651307

    申请日：2007-01-09

    申请人： Cheng Zhang ,  Heng Pan ,  Yanjun Yin

    发明人： Cheng Zhang ,  Heng Pan ,  Yanjun Yin

    IPC分类号： H04Q1/00

    CPC分类号： H04W8/20 ,  H04W36/08

    摘要： The present invention is directed to a system and method which base stations send informational messages to neighbor base stations when conditions change, so that the neighbor base stations can update its database to keep itself current on the parameters (including availability, traffic load, modulation scheme, etc.) to use in effecting efficient base station to base station handoffs. In one embodiment, the receiving base station marks the time of the received message from a neighbor base station and if a new updated message is not received within a time window then the receiving base station assumes that there is a problem with that neighbor.

    摘要翻译： 本发明涉及一种系统和方法，当条件改变时，基站向相邻基站发送信息消息，使得邻近基站可以更新其数据库以保持自身最新的参数（包括可用性，业务负载，调制方案 等）用于实现有效的基站到基站切换。 在一个实施例中，接收基站标记来自相邻基站的接收到的消息的时间，并且如果在时间窗口内没有接收到新的更新的消息，则接收基站假设该邻居存在问题。