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    Coordinated multiple point transmission and reception
    13.
    发明授权
    Coordinated multiple point transmission and reception 有权
    协调多点传输和接收

    公开(公告)号：US09148818B2

    公开(公告)日：2015-09-29

    申请号：US13749869

    申请日：2013-01-25

    Applicant: NEC Laboratories America, Inc.

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

    IPC: H04W4/00 ,  H04W28/04 ,  H04B7/02 ,  H04B7/04 ,  H04L5/00

    CPC classification number: H04W28/044 ,  H04B7/024 ,  H04B7/0486 ,  H04L5/001 ,  H04L5/0035 ,  H04L5/0044 ,  H04L5/0051 ,  H04W74/085

    Abstract: A method implemented in a mobile communications network supporting coordinated multiple point transmission and reception (CoMP) is disclosed. The method includes transmitting, to a user equipment (UE), data in a physical downlink shared channel (PDSCH), and transmitting a reference signal to the UE, wherein a union of resource elements (REs) allocated for reference signals transmitted from a subset of a plurality of transmission points (TPs) in a CoMP set are excluded from resource mapping for transmitting the data to the UE. Other methods, systems, and apparatuses also are disclosed.

    Abstract translation: 公开了一种在支持协调多点发送和接收（CoMP）的移动通信网中实现的方法。 该方法包括向用户设备（UE）发送物理下行链路共享信道（PDSCH）中的数据，以及向UE发送参考信号，其中分配给用于从子集发送的参考信号的资源元素（RE）的并集 从用于向UE发送数据的资源映射中排除CoMP集合中的多个传输点（TP）。 还公开了其它方法，系统和装置。

    LOW-COMPLEXITY PRECODER DESIGN FOR LARGE-SCALE MIMO COMMUNICATION SYSTEMS
    16.
    发明申请
    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：US20150063254A1

    公开(公告)日：2015-03-05

    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: H04B7/04 ,  H04L5/00 ,  H04W72/04

    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。

    Channel State Information (CSI) Feedback and Subsampling
    17.
    发明申请
    Channel State Information (CSI) Feedback and Subsampling 审中-公开
    渠道状态信息（CSI）反馈和二次采样

    公开(公告)号：US20140362783A1

    公开(公告)日：2014-12-11

    申请号：US14295406

    申请日：2014-06-04

    Applicant: NEC LABORATORIES AMERICA, INC.

    Inventor： Guosen Yue ,  Narayan Prasad ,  Sampath Rangarajan

    IPC: H04L5/00 ,  H04B7/04 ,  H04W24/10

    CPC classification number: H04B7/0478 ,  H04B7/0456 ,  H04B7/0486 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/063 ,  H04B7/0639 ,  H04B7/0658 ,  H04B7/066 ,  H04B7/0697 ,  H04L5/0023 ,  H04L5/0057

    Abstract: A method implemented in a base station used in a wireless communications system is disclosed. The method comprises receiving, from a user equipment, rank indication (RI), a first precoding matrix indicator (PMI), and a second PMI, the RI and the first PMI being jointly encoded, wherein 5 bits are used for transmission of the jointly encoded RI and first PMI, and wherein first 8 values of values expressed by the 5 bits are used for RI=1, second 8 values of the values expressed by the 5 bits are used for RI=2, a third value of the values expressed by the 5 bits is used for RI=3, a fourth value of the values expressed by the 5 bits is used for RI=4, and remaining 14 values of the values expressed by the 5 bits are reserved. Other methods, apparatuses, and systems 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。 该方法包括从用户设备接收秩指示（RI），第一预编码矩阵指示符（PMI）和第二PMI，RI和第一PMI被联合编码，其中5位用于联合传输 编码的RI和第一PMI，并且其中由5比特表示的值的前8个值用于RI = 1，由5比特表示的值的第8个值用于RI = 2，表示的值的第三值 通过5位用于RI = 3，由5位表示的值的第四值用于RI = 4，并且保留由5位表示的值的剩余14个值。 还公开了其它方法，装置和系统。

    Codebook Construction
    18.
    发明申请
    Codebook Construction 有权
    码本建设

    公开(公告)号：US20140241450A1

    公开(公告)日：2014-08-28

    申请号：US14204838

    申请日：2014-03-11

    Applicant: NEC LABORATORIES AMERICA, INC.

    Inventor： Narayan Prasad ,  Guosen Yue ,  Mohammad Khojastepour ,  Sampath Rangarajan

    IPC: H04B7/04

    CPC classification number: H04B7/0469 ,  H04B7/0456 ,  H04B7/0478 ,  H04B7/0486 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/0641 ,  H04B7/065 ,  H04L1/06 ,  H04L25/0391 ,  H04L27/20

    Abstract: A method implemented in a base station used in a wireless communications system is disclosed. The method comprises having 1-layer, 2-layer, 3-layer, and 4-layer codebooks for 4 transmit antenna (4TX) transmission, each codebook including a plurality of precoding matrices, precoding data with one of the plurality of precoding matrices, and transmitting, to a user equipment, the precoded data, wherein each of the 1-layer and 2-layer codebooks comprises a first codebook and a second codebook, and wherein each precoding matrix in the first codebook comprises a first index and a second index. 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。 该方法包括具有用于4个发送天线（4TX）传输的1层，2层，3层和4层码本，每个码本包括多个预编码矩阵，具有多个预编码矩阵之一的预编码数据， 以及向所述用户设备发送所述预编码数据，其中所述1层和2层码本中的每一个包括第一码本和第二码本，并且其中所述第一码本中的每个预编码矩阵包括第一索引和第二索引 。 还公开了其他装置，系统和方法。

    DFT-BASED CHANNEL ESTIMATION SYSTEMS AND METHODS
    20.
    发明申请
    DFT-BASED CHANNEL ESTIMATION SYSTEMS AND METHODS 审中-公开
    基于DFT的信道估计系统和方法

    公开(公告)号：US20130101063A1

    公开(公告)日：2013-04-25

    申请号：US13655073

    申请日：2012-10-18

    Applicant: NEC Laboratories America, Inc.

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

    IPC: H04B15/00

    CPC classification number: H04L27/265 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0228

    Abstract: DFT-based channel estimation methods and systems are disclosed. One system includes an inverse discrete Fourier transform module, a noise power estimator, a noise filter and a discrete Fourier transform module. The inverse discrete Fourier transform module is configured to determine time domain estimates by applying an inverse discrete Fourier transform to initial channel estimates computed from pilot signals. Additionally, the noise power estimator is configured to estimate noise power by determining and utilizing time domain samples that are within a vicinity of sinc nulls of the time domain estimates. The noise filter is configured to filter noise from the time domain estimates based on the estimated noise power to obtain noise filtered time domain estimates. Further, the discrete Fourier transform module is configured to perform a discrete Fourier transform on the noise filtered time domain estimates to obtain frequency domain channel estimates for channels on which pilot signals are transmitted.

    Abstract translation: 公开了基于DFT的信道估计方法和系统。 一个系统包括逆离散傅里叶变换模块，噪声功率估计器，噪声滤波器和离散傅里叶变换模块。 逆离散傅立叶变换模块被配置为通过对从导频信号计算的初始信道估计应用逆离散傅里叶变换来确定时域估计。 此外，噪声功率估计器被配置为通过确定和利用在时域估计的sinc空值附近的时域采样来估计噪声功率。 噪声滤波器被配置为基于估计的噪声功率从时域估计中滤除噪声，以获得经噪声滤波的时域估计。 此外，离散傅里叶变换模块被配置为对经噪声滤波的时域估计执行离散付里叶变换，以获得其上发送导频信号的信道的频域信道估计。

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