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142 条记录 (耗时 0.028 秒)

    Method and apparatus for error reduction in an orthogonal modulation system
    12.
    发明授权
    Method and apparatus for error reduction in an orthogonal modulation system 失效

    公开(公告)号：US07054375B2

    公开(公告)日：2006-05-30

    申请号：US09745301

    申请日：2000-12-22

    申请人： Anand Kannan ,  Tamer Kadous

    发明人： Anand Kannan ,  Tamer Kadous

    IPC分类号： H04K1/10

    CPC分类号： H04L5/006 ,  H04L1/0025 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0044 ,  H04L2025/03414

    摘要： A method and apparatus reduces error in a communication system that includes multiple orthogonal subcarriers by suppressing a subcarrier in a transmitting communication device and by equalizing a received signal in a receiving communication device. Subcarrier suppression is based on a determination of a signal quality metric with respect to each subcarrier or is based on a determination of excessive signal power overdriving an amplifier of the receiving communication device. Equalization of the received signal is based on an equalization function that reduces a multipath delay introduced to the transmitted signal when the multipath delay exceeds a tolerable multipath delay.

    Rate selection for a multi-carrier MIMO system
    14.
    发明申请
    Rate selection for a multi-carrier MIMO system 有权
    多载波MIMO系统的速率选择

    公开(公告)号：US20050088959A1

    公开(公告)日：2005-04-28

    申请号：US10778570

    申请日：2004-02-13

    申请人： Tamer Kadous

    发明人： Tamer Kadous

    IPC分类号： H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/16 ,  H04L27/26 ,  H04J11/00

    CPC分类号： H04L5/006 ,  H04L1/0003 ,  H04L1/0025 ,  H04L1/16 ,  H04L1/1671 ,  H04L5/0023 ,  H04L5/0046 ,  H04L27/2626 ,  H04L27/2647 ,  Y02D50/10

    摘要： To select a rate for data transmission in a multi-carrier MIMO system with a multipath MIMO channel, a post-detection SNR SNRl(k) for each subband k of each spatial channel l is initially determined and used to derive a constrained spectral efficiency Sl(k) based on a constrained spectral efficiency function fsiso(SNRl(k), M) of SNR and modulation scheme M. An average constrained spectral efficiency Savg for all subbands of all spatial channels used for data transmission is next determined based on the constrained spectral efficiencies for the individual subbands/spatial channels. An equivalent SNR needed by an equivalent system with an AWGN channel to support a data rate of Savg is determined based on an inverse constrained spectral efficiency function fsiso−1(Savg, M). A rate is selected for the multi-carrier MIMO system based on the equivalent SNR. The selected rate is the highest rate among all supported rates with a required SNR less than or equal to the equivalent SNR.

    摘要翻译： 为了在具有多径MIMO信道的多载波MIMO系统中选择用于数据传输的速率，首先确定每个空间信道l的每个子带k的后检测SNR SNR（k），并且 用于基于受约束的频谱效率函数f（s）来估计约束频谱效率S（k），其中，M（k） ）和调制方案M.接下来基于用于各个子带/空间信道的约束频谱效率来确定用于数据传输的所有空间信道的所有子带的平均约束频谱效率S avg 。 由具有AWGN信道的等效系统所需的用于支持数据速率为平均值的等效信号是基于逆约束频谱效率函数来确定的， 1（S平均值，M）。 基于等效SNR为多载波MIMO系统选择速率。 所选择的速率是所有支持的速率中具有所需SNR小于或等于等效SNR的最高速率。

    Rate adaptive transmission scheme for MIMO systems
    15.
    发明授权
    Rate adaptive transmission scheme for MIMO systems 有权
    MIMO系统速率自适应传输方案

    公开(公告)号：US06873606B2

    公开(公告)日：2005-03-29

    申请号：US10367234

    申请日：2003-02-14

    申请人： Avneesh Agrawal ,  Rajiv Vijayan ,  Tamer Kadous

    发明人： Avneesh Agrawal ,  Rajiv Vijayan ,  Tamer Kadous

    IPC分类号： H04B7/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04B1/02

    CPC分类号： H04L1/0618 ,  H04B7/0417 ,  H04B7/0443 ,  H04B7/0465 ,  H04B7/0615 ,  H04B7/0891 ,  H04W52/34 ,  H04W52/42

    摘要： A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.

    摘要翻译： 可以传输可变数量的数据符号流的MIMO系统的速率自适应传输方案为每个数据符号流提供发射分集，并且充分利用系统的总发射功率和每个天线的全功率。 在一种方法中，接收至少一个数据符号流用于从多个天线发射。 每个数据符号流用对应于分配给该流的发射功率的量的相应权重进行缩放。 缩放的数据符号流与发射基矩阵相乘以为多个天线提供多个发射符号流。 定义发射基矩阵（例如，沃尔什 - 哈达玛矩阵或DFT矩阵），使得每个数据符号流从所有天线发送，并且每个发射符号流以（或接近）相关天线的全功率发射。

    Rate adaptive transmission scheme for mimo systems
    16.
    发明申请
    Rate adaptive transmission scheme for mimo systems 有权
    mimo系统的速率自适应传输方案

    公开(公告)号：US20050013239A1

    公开(公告)日：2005-01-20

    申请号：US10919698

    申请日：2004-08-16

    申请人： Avneesh Agrawal ,  Rajiv Vijayan ,  Tamer Kadous

    发明人： Avneesh Agrawal ,  Rajiv Vijayan ,  Tamer Kadous

    IPC分类号： H04B7/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04J11/00 ,  H04Q7/00

    CPC分类号： H04L1/0618 ,  H04B7/0417 ,  H04B7/0443 ,  H04B7/0465 ,  H04B7/0615 ,  H04B7/0891 ,  H04W52/34 ,  H04W52/42

    摘要： A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.

    摘要翻译： 可以传输可变数量的数据符号流的MIMO系统的速率自适应传输方案为每个数据符号流提供发射分集，并且充分利用系统的总发射功率和每个天线的全功率。 在一种方法中，接收至少一个数据符号流用于从多个天线发射。 每个数据符号流用对应于分配给该流的发射功率的量的相应权重进行缩放。 缩放的数据符号流与发射基矩阵相乘以为多个天线提供多个发射符号流。 定义发射基矩阵（例如，沃尔什 - 哈达玛矩阵或DFT矩阵），使得每个数据符号流从所有天线发送，并且每个发射符号流以（或接近）相关天线的全功率发射。

    Ordered successive interference cancellation receiver processing for multipath channels
    17.
    发明申请
    Ordered successive interference cancellation receiver processing for multipath channels 有权
    用于多路径通道的有序连续干扰消除接收机处理

    公开(公告)号：US20050008092A1

    公开(公告)日：2005-01-13

    申请号：US10917079

    申请日：2004-08-11

    申请人： Tamer Kadous

    发明人： Tamer Kadous

    IPC分类号： H04L1/06 ,  H04B3/46

    CPC分类号： H04L1/0618

    摘要： Techniques to process a number of “received” symbol streams in a Multiple-Input Multiple-Output (MIMO) system with multipath channels such that improved performance may be achieved when using successive interference cancellation (SIC) processing. In an aspect, metrics indicative of the quality or “goodness” of a “detected” symbol stream are provided. These metrics consider the frequency selective response of the multipath channels used to transmit the symbol stream. For example, the metrics may relate to (1) an overall channel capacity for all transmission channels used for the symbol stream, or (2) an equivalent signal-to-interference noise ratio (SNR) of an Additive White Gaussian Noise (AWGN) channel modeling these transmission channels. In another aspect, techniques are provided to process the received symbol streams, using SIC processing, to recover a number of transmitted symbol streams. The particular order in which the symbol streams are recovered is determined based on the metrics determined for symbol streams detected at each SIC processing stage.

    摘要翻译： 在具有多路径信道的多输入多输出（MIMO）系统中处理多个“接收”符号流的技术，使得当使用连续干扰消除（SIC）处理时可以实现改进的性能。 在一方面，提供了指示“检测”符号流的质量或“良好”的度量。 这些度量考虑了用于发送符号流的多径信道的频率选择响应。 例如，度量可以涉及（1）用于符号流的所有传输信道的总体信道容量，或者（2）加性白高斯噪声（AWGN）的等效信号与干扰噪声比（SNR） 通道建模这些传输通道。 在另一方面，提供了使用SIC处理来处理所接收的符号流的技术来恢复多个传输的符号流。 基于为在每个SIC处理阶段检测到的符号流确定的度量来确定符号流被恢复的特定顺序。

    Precoding and SDMA support
    20.
    发明授权
    Precoding and SDMA support 有权
    预编码和SDMA支持

    公开(公告)号：US09136974B2

    公开(公告)日：2015-09-15

    申请号：US11401979

    申请日：2006-04-10

    申请人： Alexei Gorokhov ,  Dhananjay Ashok Gore ,  Gwendolyn D. Barriac ,  Jibing Wang ,  Tamer Kadous

    发明人： Alexei Gorokhov ,  Dhananjay Ashok Gore ,  Gwendolyn D. Barriac ,  Jibing Wang ,  Tamer Kadous

    IPC分类号： H04W72/00 ,  H04L1/00 ,  H04W72/04 ,  H04B7/04 ,  H04B7/06 ,  H04L1/06

    CPC分类号： H04L1/0001 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0639 ,  H04B7/0663 ,  H04B7/0689 ,  H04L1/06 ,  H04W72/04

    摘要： Embodiments are described in connection with enhancing performance in a wireless communication system using codebook technology. According to an embodiment is a method for enhancing performance in a wireless communication environment. The method can include receiving a user preference for a transmission mode, associating the user preference with an entry or entries in a codebook, and assigning the user to a transmission mode corresponding to the entry or entries. The transmission mode can be one of a precoding, space division multiple access (SDMA), SDMA precoding, multiple input multiple output (MIMO), MIMO precoding, MIMO-SDMA and a diversity. Each entry can correspond to a transmission mode.

    摘要翻译： 结合增强使用码本技术的无线通信系统中的性能来描述实施例。 根据实施例是用于增强无线通信环境中的性能的方法。 该方法可以包括接收用户对传输模式的偏好，将用户偏好与码本中的条目或条目相关联，并将用户分配给与条目或条目相对应的传输模式。 传输模式可以是预编码，空分多址（SDMA），SDMA预编码，多输入多输出（MIMO），MIMO预编码，MIMO-SDMA和分集之一。 每个条目可以对应于传输模式。