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    Precoding Selection for Retransmission in Uplink MIMO Hybrid ARQ
    31.
    发明申请
    Precoding Selection for Retransmission in Uplink MIMO Hybrid ARQ 有权
    上行MIMO混合ARQ中重传的预编码选择

    公开(公告)号：US20140219379A1

    公开(公告)日：2014-08-07

    申请号：US14247643

    申请日：2014-04-08

    Applicant: NEC Laboratories America, Inc.

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

    IPC: H04B7/04 ,  H04L1/18

    CPC classification number: H04B7/0456 ,  H04L1/0618 ,  H04L1/1896 ,  H04L25/03343 ,  H04L2025/03426

    Abstract: A method implemented in a user terminal is disclosed. The method comprises obtaining known precoding matrix P of rank r and modulation and coding scheme assignments used in an original transmission, and a desired retransmission rank r′, forming an approximate channel covariance matrix, estimating a minimum mean square error receiver SINR for each layer to be retransmitted responsive to said forming, and finding a retransmission precoding matrix from a preceding codebook that maximizes a sum-rate for enabling precoding selections for retransmissions in uplink multiple-input multiple-output MIMO hybrid automatic repeat request HARQ. Other methods, apparatuses, and systems also are disclosed.

    Abstract translation: 公开了一种在用户终端中实现的方法。 该方法包括获得秩r的已知预编码矩阵P以及在原始传输中使用的调制和编码方案分配以及期望的重传秩r'，形成近似信道协方差矩阵，估计每层的最小均方误差接收机SINR 响应于所述形成重新发送，并从上一个码本中找到重新发送预编码矩阵，其使在上行链路多输入多输出MIMO混合自动重传请求HARQ中进行重新发送的预编码选择最大化的和速率。 还公开了其它方法，装置和系统。

    Channel Feedback for Vertical and Full-Dimensional Beamforming
    32.
    发明申请
    Channel Feedback for Vertical and Full-Dimensional Beamforming 有权
    垂直和全尺寸波束形成的通道反馈

    公开(公告)号：US20140198751A1

    公开(公告)日：2014-07-17

    申请号：US14156064

    申请日：2014-01-15

    Applicant: NEC Laboratories America, Inc.

    Inventor： Narayan Prasad ,  Guosen Yue ,  Sampath Rangarajan

    IPC: H04L5/00

    CPC classification number: H04B7/0632 ,  H04B7/024 ,  H04B7/0452 ,  H04B7/0617 ,  H04B7/0639 ,  H04L5/0048 ,  H04L5/0073

    Abstract: A method implemented in a base station used in a wireless communications system where different antenna arrays are employed for transmissions to different co-scheduled users in a cell is disclosed. The method includes configuring multiple channel state information (CSI) processes for a user equipment (UE), and configuring, for the UE, a plurality of non-zero power (NZP) CSI reference signal (RS) resources, each of which is associated with an antenna array. Other apparatuses, systems, and methods also are disclosed.

    Abstract translation: 公开了一种在无线通信系统中使用的基站中实现的方法，其中使用不同的天线阵列来传送到小区中的不同共同调度用户。 该方法包括为用户设备（UE）配置多个信道状态信息（CSI）过程，以及为UE配置多个非零功率（NZP）CSI参考信号（RS）资源，每个资源相关联 与天线阵列。 还公开了其他装置，系统和方法。

    COORDINATED MULTI-POINT TRANSMISSION AND RECEPTION SCHEMES FOR CELLULAR DOWNLINK
    33.
    发明申请
    COORDINATED MULTI-POINT TRANSMISSION AND RECEPTION SCHEMES FOR CELLULAR DOWNLINK 有权
    协调多点传输和细节下载接收方案

    公开(公告)号：US20140140429A1

    公开(公告)日：2014-05-22

    申请号：US14083537

    申请日：2013-11-19

    Applicant: NEC Laboratories America, Inc.

    Inventor： Narayan Prasad

    IPC: H04B7/04

    CPC classification number: H04B7/0456 ,  H04B7/024 ,  H04B7/0465

    Abstract: There is provided a method for generating transmit precoders for a communication system having a plurality of transmitters and a plurality of receivers forming a plurality of transmitter-receiver pairs. Each of the transmitters and receivers has a respective plurality of antennas. The method includes initializing the transmit precoders. The method further includes updating a plurality of receiver filters and a plurality of slack variables using closed form expressions. The method also includes updating the transmit precoders responsive to an output of said prior updating step. The method additionally includes iteratively repeating the updating steps until convergence is reached to obtain a final set of transmit precoders. The transmit precoders are updated to perform precoding for multiple stream data transmission for each of the plurality of transmitter-receiver pairs on each of a plurality of slots under a per-antenna power constraint imposed on each of the plurality of antennas.

    Abstract translation: 提供了一种用于生成具有多个发射机的通信系统和形成多个发射机 - 接收机对的多个接收机的发射预编码器的方法。 每个发射机和接收机具有相应的多个天线。 该方法包括初始化发送预编码器。 该方法还包括使用闭合形式表达式更新多个接收器滤波器和多个松弛变量。 该方法还包括响应于所述先前更新步骤的输出更新发送预编码器。 该方法另外包括迭代地重复更新步骤，直到达到收敛以获得最终的发送预编码集合。 更新发射预编码器以在施加在多个天线中的每一个上的每天线功率约束下，在多个时隙中的每一个上对多个发射机 - 接收机对中的每一个执行多个流数据传输的预编码。

    Managing analog beams in mmWave networks
    35.
    发明授权
    Managing analog beams in mmWave networks 有权

    公开(公告)号：US10292059B2

    公开(公告)日：2019-05-14

    申请号：US15874016

    申请日：2018-01-18

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan ,  Yasaman Ghasempour

    IPC: H04W24/02 ,  H04W72/04 ,  H04W16/28 ,  H04B7/02

    Abstract: A computer-implemented method executed in a wireless communication system for establishing communication links in a millimeter wave network is presented. The method includes determining active communication links between a plurality of transmitters and a plurality of receivers operated by a plurality of users and formulating a quality of service (QoS) proportional fairness (PF) network utility as a constrained submodular set function maximization problem. The method further includes performing an optimization framework by optimizing, based on the active communication links, user association for fixed transmit beam patterns and optimizing, based on the active communication links, the fixed transmit beam patterns and corresponding beam attributes for a fixed set of user associations. The method also includes iteratively performing the optimizing steps in an alternating manner to determine a user from the plurality of users that optimizes the constrained submodular set function maximization problem and assigning the determined user to a cell.

    Energy Efficient Downlink Scheduling in LTE-Advanced Networks
    38.
    发明申请
    Energy Efficient Downlink Scheduling in LTE-Advanced Networks 审中-公开
    LTE高级网络中的节能下行链路调度

    公开(公告)号：US20170070956A1

    公开(公告)日：2017-03-09

    申请号：US15255288

    申请日：2016-09-02

    Applicant: NEC Laboratories America, Inc.

    Inventor： Narayan Prasad ,  Sampath Rangarajan ,  Hajar Mahdavi-Doost

    IPC: H04W52/02 ,  H04W72/12 ,  H04W72/04

    CPC classification number: H04W52/0216 ,  H04W72/1273 ,  Y02D70/00 ,  Y02D70/1262 ,  Y02D70/1264

    Abstract: A method is provided for performing downlink scheduling in Long Term Evolution-Advanced networks. The method includes assigning resource blocks and transmission modes to users such that (i) each of the users that is assigned at least one of the resource blocks is assigned only one transmission mode chosen from a finite set of transmission modes, (ii) a sum of normalized costs across all of the resource blocks that are assigned to the users is less than unity. The method further includes incorporating a resource block and transmission mode assignment for a user into downlink scheduler of a base station to cause the downlink scheduler to perform downlink scheduling in accordance with the resource block and transmission mode assignment.

    Abstract translation: 提供了一种用于在长期演进 - 高级网络中执行下行链路调度的方法。 该方法包括向用户分配资源块和传输模式，使得（i）被分配至少一个资源块的每个用户只分配从有限传输模式集合中选择的一种传输模式，（ii）总和 分配给用户的所有资源块的归一化成本小于1。 该方法还包括将用户的资源块和传输模式分配合并到基站的下行链路调度器中，以使下行链路调度器根据资源块和传输模式分配来执行下行链路调度。

    Enhanced interference management in heterogeneous wireless networks
    39.
    发明授权
    Enhanced interference management in heterogeneous wireless networks 有权
    异构无线网络中增强的干扰管理

    公开(公告)号：US09538415B2

    公开(公告)日：2017-01-03

    申请号：US14603723

    申请日：2015-01-23

    Applicant: NEC Laboratories America, Inc.

    Inventor： Narayan Prasad ,  Mustafa Arslan ,  Sampath Rangarajan

    IPC: H04W28/02 ,  H04L5/00 ,  H04W72/12 ,  H04W24/02

    CPC classification number: H04W28/0236 ,  H04L5/0037 ,  H04L5/0058 ,  H04L5/0073 ,  H04L5/0076 ,  H04W24/02 ,  H04W72/1273

    Abstract: We show that for any given muting fraction, a more constrained version of the problem of interest can be optimally solved in an efficient manner. In addition, the obtained solution is also a near-optimal solution for the original problem (for the given muting ratio). This allows us provide an algorithm that offers a good solution to the original problem with a tractable complexity. We also derive a lower complexity greedy that offers good performance and a certain worst-case performance guarantee. Simulations over an example LTE HetNet topology reveal the superior performance of the proposed algorithms and underscore the benefits of jointly exploiting partial muting of the macro and load balancing.

    Abstract translation: 我们表明，对于任何给定的静噪分数，可以以有效的方式最佳地解决感兴趣问题的更受约束的版本。 此外，所获得的解决方案也是原始问题的近似最优解（对于给定的静噪比）。 这允许我们提供一种算法，为原来的问题提供一个很好的解决方案，容易复杂。 我们还推出了一个较低复杂性的贪心，提供了良好的性能和一些最坏的性能保证。 通过示例LTE HetNet拓扑的仿真揭示了所提出的算法的优越性能，并强调了共同利用宏和负载均衡的部分静音的好处。

    Low-complexity precoder design for large-scale MIMO communication systems
    40.
    发明授权
    Low-complexity precoder design for large-scale MIMO communication systems 有权
    用于大规模MIMO通信系统的低复杂度预编码器设计

    公开(公告)号：US09450657B2

    公开(公告)日：2016-09-20

    申请号：US14465053

    申请日：2014-08-21

    Applicant: NEC Laboratories America, Inc.

    Inventor： Guosen Yue ,  Narayan Prasad ,  Sampath Rangarajan ,  Samet Oymak

    IPC: H04L1/06 ,  H04L5/00 ,  H04W72/04 ,  H04B7/04

    CPC classification number: H04B7/0465 ,  H04B7/0439 ,  H04B7/0443 ,  H04B7/0452 ,  H04B7/0469 ,  H04B7/0617 ,  H04L5/0037 ,  H04W52/367 ,  H04W52/42

    Abstract: A method and system are provided. The method includes providing transmit precoders for a multiple-input and multiple-output communication system having a plurality of transmit antennas. The plurality of transmit antennas are for forming, using precoding, a plurality of channels such that each of the plurality of channels are configurable to serve a respective one of a plurality of users. The providing step includes imposing a respective average transmit antenna power constraint on each of the plurality of transmit antennas. The providing step further includes determining a diagonal precoder responsive to applying column scaling to a downlink channel matrix having a plurality of rows and a plurality of columns. The providing step additionally includes generating, from the diagonal precoder, a weighted precoder in accordance with the respective average antenna power constraint by optimizing a weighted sum-rate obtained upon transmitting respective signals over the plurality of channels.

    Abstract translation: 提供了一种方法和系统。 该方法包括为具有多个发射天线的多输入和多输出通信系统提供发射预编码器。 多个发射天线用于使用预编码形成多个信道，使得多个信道中的每一个可配置为服务于多个用户中的相应一个。 提供步骤包括在多个发射天线中的每一个上施加相应的平均发射天线功率约束。 所述提供步骤还包括：响应于对具有多个行和多个列的下行链路信道矩阵应用列缩放来确定对角预编码器。 提供步骤还包括从对角线预编码器根据相应的平均天线功率约束，通过优化通过多个信道发送各个信号而获得的加权和频率来生成加权预编码器。

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