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46 条记录 (耗时 0.019 秒)

    Method of OFDMA tone interference cancellation
    1.
    发明授权
    Method of OFDMA tone interference cancellation 失效
    OFDMA音调干扰消除方法

    公开(公告)号：US07688708B2

    公开(公告)日：2010-03-30

    申请号：US11388638

    申请日：2006-03-24

    申请人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

    发明人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

    IPC分类号： H04J11/00

    CPC分类号： H04L5/0016 ,  H04B1/71072 ,  H04B2001/71077 ,  H04L5/0007 ,  H04L25/0228 ,  H04L25/03076 ,  H04L27/0008 ,  H04L27/2647

    摘要： An improved method is provided for reducing inter-carrier interference in the CDMA subchannels of hybrid OFDMA-CDMA systems. The results of decoding OFDMA tones are used to at least partially cancel interference from CDMA tones. Then, the CDMA tones are decoded. In specific embodiments, control information is obtained by an initial step of decoding the CDMA tones. The control information is used in decoding the OFDMA tones. Then, the decoding of the OFDMA tones and the decoding of the CDMA tones are performed iteratively, such that at least one instance of OFDMA decoding is used to cancel interference from the CDMA tones, and at least one instance of CDMA decoding is used to obtain improved control information for decoding the OFDMA tones.

    摘要翻译： 提供了一种用于减少混合OFDMA-CDMA系统的CDMA子信道中的载波间干扰的改进方法。 解码OFDMA音调的结果用于至少部分地消除来自CDMA音调的干扰。 然后，解码CDMA音调。 在具体实施例中，通过解码CDMA音调的初始步骤获得控制信息。 控制信息用于解码OFDMA音调。 然后，迭代地执行OFDMA音调的解码和CDMA音调的解码，使得使用OFDMA解码的至少一个实例来消除来自CDMA音调的干扰，并且使用CDMA解码的至少一个实例来获得 用于解码OFDMA音调的改进的控制信息。

    Method for controlling transmission rates in a wireless communications system
    3.
    发明授权
    Method for controlling transmission rates in a wireless communications system 有权
    用于控制无线通信系统中的传输速率的方法

    公开(公告)号：US07499439B2

    公开(公告)日：2009-03-03

    申请号：US11145559

    申请日：2005-06-03

    申请人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

    发明人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

    IPC分类号： H04Q7/24

    CPC分类号： H04B7/264 ,  H04L47/14 ,  H04L47/25 ,  H04L47/29 ,  H04W28/22

    摘要： A method is provided for controlling communications between a base station and a mobile device. The method comprises transmitting a pilot signal having at least one transmitted characteristic over a channel. A data rate control signal is received, indicating a variation between the transmitted characteristic and a corresponding actual characteristic of the pilot signal received at a remote location. The data rate control signal is modified based on a coefficient related to the bandwidth of the channel, and a transmission rate is determined based on the modified data rate control signal.

    摘要翻译： 提供了一种用于控制基站和移动设备之间的通信的方法。 该方法包括通过信道发送具有至少一个传输特性的导频信号。 接收数据速率控制信号，指示传输特性与在远程位置接收的导频信号的对应实际特性之间的变化。 数据速率控制信号根据与信道的带宽相关的系数进行修改，并且基于修改的数据速率控制信号来确定传输速率。

    Method for enabling use of secondary pilot signals across a forward link of a CDMA network employing a slotted transmission scheme and time multiplexed pilot channel
    7.
    发明授权
    Method for enabling use of secondary pilot signals across a forward link of a CDMA network employing a slotted transmission scheme and time multiplexed pilot channel 有权
    用于使用采用时隙传输方案和时分多路复用导频信道的CDMA网络的前向链路上的辅导频信号的方法

    公开(公告)号：US07869416B2

    公开(公告)日：2011-01-11

    申请号：US11070437

    申请日：2005-03-02

    申请人： Sudhir Ramakrishna ,  Ashok N. Rudrapatna

    发明人： Sudhir Ramakrishna ,  Ashok N. Rudrapatna

    IPC分类号： H04J3/00 ,  H04B7/216

    CPC分类号： H04B1/707 ,  H04B7/0632 ,  H04B2201/70701 ,  H04L1/0002

    摘要： A method enables the use of a secondary pilot signal and a secondary antenna(s) in the forward link of a CDMA-based cellular network employing a slotted transmission scheme with a time-multiplexed primary pilot signal, with backwards compatibility. The forward link is divided into a number of time slots. For communications with “legacy” mobile stations that expect transmissions from a single, primary antenna (and that expect a single, primary pilot signal), during some of the time slots, only the primary antenna is used for transmissions, including transmitting the primary pilot signal. Neither the secondary pilot channel nor any other signals from the secondary antenna are transmitted. During the remaining time slots: (i) the primary pilot signal is transmitted from the primary antenna, and the secondary pilot signal is transmitted from the secondary antenna, but at different times; and (ii) data meant for the legacy mobile stations is not transmitted.

    摘要翻译： 一种方法使得能够使用具有后向兼容性的采用具有时间复用的主导频信号的时隙传输方案的基于CDMA的蜂窝网络的前向链路中的次级导频信号和次级天线。 前向链路分为多个时隙。 为了与期望来自单个主要天线（并且期望单个主要导频信号）的传输的“传统”移动站的通信，在一些时隙期间，仅将主天线用于传输，包括传送主导频 信号。 二次导频信道也不发送来自次天线的任何其它信号。 在剩下的时隙中：（i）主导频信号从主天线发射，次导频信号从次天线发射，但在不同时间发射; 并且（ii）不传输用于传统移动台的数据。

    Obtaining data rates for mobile stations based on a forward link of a cellular system
    8.
    发明授权
    Obtaining data rates for mobile stations based on a forward link of a cellular system 有权
    基于蜂窝系统的前向链路获取移动台的数据速率

    公开(公告)号：US07486645B2

    公开(公告)日：2009-02-03

    申请号：US11298301

    申请日：2005-12-09

    申请人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Narasimhaiya Rudrapatna

    发明人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Narasimhaiya Rudrapatna

    IPC分类号： H04B7/216

    CPC分类号： H04W28/22

    摘要： The present invention provides a method and an apparatus for adapting a data rate that a mobile station indicates to a base station for transmission on a forward link in a cellular system. The method comprises measuring a first value indicative of strength of at least one of a primary and a secondary pilot. The method further comprises compensating the first value indicative of strength of the pilot based on an offset to select a second value indicative of the data rate for the base station. The base station may determine an offset value for compensation and send an indication to the mobile station during the setup of the mobile station. When the mobile station connects to the base station, a measurement of a channel condition (i.e., pilot) may determine a revised data rate for transmission of a next data packet on the forward link.

    摘要翻译： 本发明提供了一种用于使移动台指示给基站的数据速率适应于蜂窝系统中的前向链路上传输的方法和装置。 该方法包括测量指示主飞行员和副驾驶员中的至少一个的强度的第一值。 该方法还包括基于偏移来补偿指示导频的强度的第一值，以选择指示基站的数据速率的第二值。 基站可以确定用于补偿的偏移值，并且在移动站的建立期间向移动台发送指示。 当移动站连接到基站时，信道条件（即，导频）的测量可以确定用于在前向链路上发送下一个数据分组的修改的数据速率。

    Transmitting data from a mobile station on an uplink in a spread spectrum cellular system
    9.
    发明申请
    Transmitting data from a mobile station on an uplink in a spread spectrum cellular system 审中-公开
    在扩频蜂窝系统的上行链路上从移动站发送数据

    公开(公告)号：US20070091786A1

    公开(公告)日：2007-04-26

    申请号：US11256629

    申请日：2005-10-21

    申请人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

    发明人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

    IPC分类号： H04J9/00

    CPC分类号： H04B1/707 ,  H04B1/692 ,  H04J13/16

    摘要： The present invention provides a method and an apparatus for a wireless communication between at least one mobile station and a base station in a cellular system. The method comprises providing a desired spreading in time and frequency domains to transmit data using at least two carriers in a transmission on an uplink to the base station. Either the base station may provide an indication to the mobile station to enable the desired spreading, or alternatively, the mobile station may request it. A spread-spectrum cellular system may enable a mobile station to provide a two-dimensional spreading, which distributes spreading in time and frequency directions. A single two-dimensional spreading code or at least two one-dimensional spreading codes may provide a two-dimensional spreading. In this way, in an uplink transmission using a multi-carrier, code division multiple access (MC-CDMA) protocol, by varying the data portions being spread in time and frequency domains a joint spreading may result. The joint spreading may distribute spreading codes in the time and frequency directions to distribute the spreading in a transmission. When using the MC-CDMA protocol, a mobile station may select one or more spreading formats in an uplink transmission that may increase the success rate of the packet transmission. Moreover, use of a particular spreading format in a flexible manner may reduce the packet delay and suppress intra-cell interference.

    摘要翻译： 本发明提供一种用于在蜂窝系统中的至少一个移动台与基站之间的无线通信的方法和装置。 该方法包括在时基和频域中提供期望的扩展，以便在到基站的上行链路上的传输中使用至少两个载波来发送数据。 基站可以向移动台提供指示以实现期望的扩展，或者替代地，移动台可以请求它。 扩频蜂窝系统可以使移动台能够提供二维扩展，其在时间和频率方向上分布扩展。 单个二维扩展码或至少两个一维扩展码可以提供二维扩展。 以这种方式，在使用多载波，码分多址（MC-CDMA）协议的上行链路传输中，通过改变在时域和频域上扩展的数据部分，可能导致联合扩频。 联合扩展可以在时间和频率方向上分布扩展码，以在传输中分布扩展。 当使用MC-CDMA协议时，移动台可以在可能增加分组传输的成功率的上行链路传输中选择一个或多个扩展格式。 此外，以灵活的方式使用特定的扩展格式可以减少分组延迟并抑制小区内干扰。

    Method for increasing capacity in a wireless communications system
    10.
    发明申请
    Method for increasing capacity in a wireless communications system 审中-公开
    提高无线通信系统容量的方法

    公开(公告)号：US20060203793A1

    公开(公告)日：2006-09-14

    申请号：US11076288

    申请日：2005-03-09

    申请人： Shupeng Li ,  Lawrence Ozarow ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

    发明人： Shupeng Li ,  Lawrence Ozarow ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

    IPC分类号： H04J1/00

    CPC分类号： H04L5/023

    摘要： A method is provided for controlling communications between a base station and a mobile device. The method comprises transmitting information between the base station and the mobile device over a plurality of sub-channels where each sub-channel has a different carrier frequency. A first portion of the sub-channels are used for legacy mobile devices, and a second portion of the sub-channels is used by new mobile devices.

    摘要翻译： 提供了一种用于控制基站和移动设备之间的通信的方法。 该方法包括在每个子信道具有不同载波频率的多个子信道上在基站和移动设备之间传送信息。 子信道的第一部分用于传统移动设备，并且新的移动设备使用子信道的第二部分。