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    Precoded data receiver
    111.
    发明授权
    Precoded data receiver 有权
    预编码数据接收器

    公开(公告)号：US08270918B2

    公开(公告)日：2012-09-18

    申请号：US13267298

    申请日：2011-10-06

    Applicant: Mohammad Ali Khojastepour ,  Narayan Prasad

    Inventor： Mohammad Ali Khojastepour ,  Narayan Prasad

    IPC: H04B1/04

    CPC classification number: H04B7/0617 ,  H04B7/0456 ,  H04B7/0632 ,  H04B7/0639

    Abstract: A multi-rank beamforming (MRBF) scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the MRBF transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices having a recursive structure which allows for efficient computation of the optimal precoding matrix and corresponding Signal to Interference and Noise Ratio (SINR). The codebook also enjoys a small storage footprint. Due to the computational efficiency and modest memory requirements, the optimal precoding determination can be made at user equipment (UE) and communicated to a transmitting base station over a limited uplink channel for implementation over the downlink channel.

    Abstract translation: 相应地确定其中估计下行链路信道并由MRBF发射机使用的最佳预编码矩阵的多级波束成形（MRBF）方案。 从具有递归结构的矩阵码本中选择最佳预编码矩阵，其允许有效计算最佳预编码矩阵和对应的信号与干扰和噪声比（SINR）。 该码本还具有小的存储空间。 由于计算效率和适度的存储器要求，可以在用户设备（UE）进行最佳预编码确定，并通过有限的上行链路信道传送到发射基站，以通过下行链路信道实现。

    Wireless communication rate allocation on a Gaussian interference channel
    112.
    发明授权
    Wireless communication rate allocation on a Gaussian interference channel 有权
    高斯干扰信道上的无线通信速率分配

    公开(公告)号：US08238366B2

    公开(公告)日：2012-08-07

    申请号：US12273810

    申请日：2008-11-19

    Applicant: Narayan Prasad ,  Xiaodong Wang

    Inventor： Narayan Prasad ,  Xiaodong Wang

    IPC: H04J3/16

    CPC classification number: H04W28/22 ,  H04W72/04

    Abstract: The invention provides a sequential rate allocation process which assigns excess rates to variable-rate users in a sequential fashion according to specified priorities and yields a strongly pare-to-optimal rate allocation. The invention also provides two parallel rate allocation techniques for where all variable-rate users have the same priority. The first is a parallel symmetric rate and the second is an iterative rate allocation.

    Abstract translation: 本发明提供了一种顺序速率分配过程，其按照指定的优先级顺序地向可变速率用户分配多余的速率，并且产生强烈的最优速率分配。 本发明还提供了两种并行速率分配技术，其中所有可变速率用户具有相同的优先级。 第一个是并行对称速率，第二个是迭代速率分配。

    Coordinated linear beamforming in downlink multi-cell wireless networks
    113.
    发明授权
    Coordinated linear beamforming in downlink multi-cell wireless networks 有权
    下行链路多小区无线网络中的协调线性波束成形

    公开(公告)号：US08218422B2

    公开(公告)日：2012-07-10

    申请号：US12477255

    申请日：2009-06-03

    Applicant: Luca Venturino ,  Xiaodong Wang ,  Narayan Prasad

    Inventor： Luca Venturino ,  Xiaodong Wang ,  Narayan Prasad

    IPC: H04J11/00

    CPC classification number: H04W16/28

    Abstract: System and methods are disclosed for optimizing wireless communication for a plurality of mobile wireless devices. The system uses beamforming vectors or precoders having a structure optimal with respect to the weighted sum rate in a multi-cell orthogonal frequency division multiple access (OFDMA) downlink. A plurality of base stations communicate with the mobile devices and all base stations perform a distributed non-convex optimization exploiting the determined structure.

    Abstract translation: 公开了用于优化多个移动无线设备的无线通信的系统和方法。 该系统在多小区正交频分多址（OFDMA）下行链路中使用具有关于加权和速率最优的结构的波束成形向量或预编码器。 多个基站与移动设备进行通信，并且所有基站使用所确定的结构来执行分布式非凸优化。

    Robust Linear Precoder Designs for Multi-Cell Downlink Transmission
    114.
    发明申请
    Robust Linear Precoder Designs for Multi-Cell Downlink Transmission 有权
    用于多单元下行链路传输的鲁棒线性预测器设计

    公开(公告)号：US20120170676A1

    公开(公告)日：2012-07-05

    申请号：US13414110

    申请日：2012-03-07

    Applicant: Ali Tajer ,  Narayan Prasad ,  Xiaodong Wang ,  Sampath Rangarajan

    Inventor： Ali Tajer ,  Narayan Prasad ,  Xiaodong Wang ,  Sampath Rangarajan

    IPC: H04B7/02

    CPC classification number: H04B7/0626 ,  H04B7/022

    Abstract: Methods and systems for optimizing the utilities of receiver devices in a wireless communication network are disclosed. Precoder design formulations that maximize a minimum worst-case rate or a worst-case sum rate are described for both full base station, cooperation and limited base station cooperation scenarios. In addition, optimal equalizers are also selected to optimize the worst-case sum rate.

    Abstract translation: 公开了用于优化无线通信网络中的接收机设备的实用性的方法和系统。 对于完整的基站，合作和有限的基站合作情况，都会描述最大化最小最坏情况速率或最差情况下的总速率的预编码器设计公式。 此外，还选择最佳均衡器来优化最差情况下的和速率。

    Low Complexity Link Adaptatation for LTE/LTE-A Uplink with a Turbo Receiver
    117.
    发明申请
    Low Complexity Link Adaptatation for LTE/LTE-A Uplink with a Turbo Receiver 有权
    具有Turbo接收器的LTE / LTE-A上行链路的低复杂度链路自适应

    公开(公告)号：US20120069757A1

    公开(公告)日：2012-03-22

    申请号：US13234885

    申请日：2011-09-16

    Applicant: Meilong Jiang ,  Narayan Prasad ,  Guosen Yue ,  Sampath Rangarajan

    Inventor： Meilong Jiang ,  Narayan Prasad ,  Guosen Yue ,  Sampath Rangarajan

    IPC: H04B15/00 ,  H04W24/00 ,  H04L12/26

    CPC classification number: H04B7/0417 ,  H04B7/0404 ,  H04B7/0486 ,  H04B7/0626 ,  H04B7/063 ,  H04B7/0639 ,  H04J11/0033 ,  H04L1/0031 ,  H04L5/0023

    Abstract: An inventive method for link adaptation for an LTE/LTE-A uplink with a turbo SIC receiver includes the steps of determining a precoding matrix index PMI and rank index RI selection for an LTE/LTE-A uplink when precoding of the uplink is enabled, responsive to channel state information of a subcarrier in the uplink; determining a decoding order for codewords in the uplink i) when the precoding of the uplink is not enabled and ii) if needed when the precoding of the uplink is enabled; performing modulation and coding scheme MCS assignment for the uplink based on a hard decision successive interference cancellation SIC rule (without intra-CW cancellation) or a partial hard decision successive interference cancellation SIC rule (with intra-CW cancellation), responsive to the determined PMI and RI selection; and influencing data transmission in the uplink responsive to the MCS assignment for detection by a turbo SIC receiver.

    Abstract translation: 用于具有turbo SIC接收机的LTE / LTE-A上行链路的链路适配的创新方法包括以下步骤：当启用上行链路的预编码时，确定LTE / LTE-A上行链路的预编码矩阵索引PMI和秩索引RI选择， 响应于所述上行链路中的子载波的信道状态信息; 确定所述上行链路中的码字的解码顺序i）当所述上行链路的预编码不被使能时，以及ii）如果在启用所述上行链路的预编码时需要; 基于硬判决连续干扰消除SIC规则（无内部CW消除）或部分硬判决连续干扰消除SIC规则（具有CW内取消），执行针对上行链路的调制和编码方案MCS分配，响应于所确定的PMI 和RI选择; 并且响应于用于由turbo SIC接收机检测的MCS分配来影响上行链路中的数据传输。

    Fast convergence to optimal beam patterns
    118.
    发明授权
    Fast convergence to optimal beam patterns 有权
    快速收敛到最佳波束图案

    公开(公告)号：US08140024B2

    公开(公告)日：2012-03-20

    申请号：US12825693

    申请日：2010-06-29

    Applicant: Narayan Prasad ,  Kishore Ramachandran

    Inventor： Narayan Prasad ,  Kishore Ramachandran

    IPC: H04B1/00 ,  H04B7/00

    CPC classification number: H04B7/0695 ,  H04B7/0634 ,  H04B7/0808 ,  H04B7/088

    Abstract: Systems and methods for joint training of beam patterns in a system having a transmitter and a receiver. Initial transmit and receive beam pattern vectors are first selected. The beam pattern vectors are perturbed to produce a plurality of perturbed transmit and receive beam pattern vectors. A received signal power between the transmitter and the receiver is estimated for each combination of the perturbed transmit and the perturbed receive beam pattern vectors. The transmit and receive beam pattern vectors having a highest received signal power are applied to the transmitter and the receiver respectively. The perturbation, estimation, and application steps are iterated until the received signal power meets a convergence criterion.

    Abstract translation: 在具有发射机和接收机的系统中联合训练波束图案的系统和方法。 首先选择初始发射和接收波束图案向量。 波束图案向量被扰动以产生多个扰动的发射和接收波束图案向量。 对于扰动发射和扰动的接收波束图案向量的每个组合，估计发射机和接收机之间的接收信号功率。 具有最高接收信号功率的发射和接收波束图案向量分别被施加到发射机和接收机。 扰动，估计和应用步骤被迭代，直到接收到的信号功率满足收敛标准。

    Precoded Data Receiver
    119.
    发明申请
    Precoded Data Receiver 有权
    预编码数据接收器

    公开(公告)号：US20120057657A1

    公开(公告)日：2012-03-08

    申请号：US13267298

    申请日：2011-10-06

    Applicant: Mohammad A. Khojastepour ,  Narayan Prasad

    Inventor： Mohammad A. Khojastepour ,  Narayan Prasad

    IPC: H04L27/06

    CPC classification number: H04B7/0617 ,  H04B7/0456 ,  H04B7/0632 ,  H04B7/0639

    Abstract: A multi-rank beamforming (MRBF) scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the MRBF transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices having a recursive structure which allows for efficient computation of the optimal precoding matrix and corresponding Signal to Interference and Noise Ratio (SINR). The codebook also enjoys a small storage footprint. Due to the computational efficiency and modest memory requirements, the optimal precoding determination can be made at user equipment (UE) and communicated to a transmitting base station over a limited uplink channel for implementation over the downlink channel.

    Abstract translation: 相应地确定其中估计下行链路信道并由MRBF发射机使用的最佳预编码矩阵的多级波束成形（MRBF）方案。 从具有递归结构的矩阵码本中选择最佳预编码矩阵，其允许有效计算最佳预编码矩阵和对应的信号与干扰和噪声比（SINR）。 该码本还具有小的存储空间。 由于计算效率和适度的存储器要求，可以在用户设备（UE）进行最佳预编码确定，并通过有限的上行链路信道传送到发射基站，以通过下行链路信道实现。

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