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Patent Agency Ranking
公开(公告)号：US20150288434A1
公开(公告)日：2015-10-08
申请号：US14744496
申请日：2015-06-19
Applicant: NEC Laboratories America, Inc.
Inventor： Narayan Prasad , Guosen Yue , Mohammad A. Khojastepour , Meilong Jiang , Sampath Rangarajan
CPC classification number: H04B7/0452 , H04J11/0046 , H04L5/0023 , H04L25/03331 , H04L27/0008 , H04L27/0012 , H04L27/34 , H04W72/042 , H04W72/12
Abstract: A method implemented in a user equipment used in a wireless communications system is disclosed. The method comprises receiving from a base station an indication of a first modulation type for the user equipment, receiving from the base station a first data signal for the user equipment, receiving from the base station an indication of a minimum time-frequency unit that is assigned to another user equipment, receiving a second data signal for said another user equipment, where a second modulation type for said another user equipment is unknown to the user equipment, and cancelling and suppressing interference by using the minimum time-frequency unit. Other methods, systems, and apparatuses also are disclosed.
Abstract translation: 公开了一种在无线通信系统中使用的用户设备中实现的方法。 该方法包括从基站接收用户设备的第一调制类型的指示，从基站接收用户设备的第一数据信号，从基站接收最小时间频率单元的指示，该最小时间频率单位是 分配给另一用户设备，接收用于所述另一用户设备的第二数据信号，其中所述另一用户设备的第二调制类型对于用户设备是未知的，并且通过使用最小时间频率单元来消除和抑制干扰。 还公开了其它方法，系统和装置。
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公开(公告)号：US09020061B2
公开(公告)日：2015-04-28
申请号：US14198653
申请日：2014-03-06
Applicant: NEC Laboratories America, Inc.
Inventor： Narayan Prasad , Guosen Yue , Mohammad Khojastepour , Sampath Rangarajan
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 a 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 precoding matrix W satisfies W=W(1)W(2), where first matrix W(1) is chosen from first codebook (1), and second matrix W(2) is chosen from a second codebook. 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。 该方法包括具有包括多个预编码矩阵的码本，与多个预编码矩阵之一进行预编码数据，并向用户设备发送预编码数据，其中每个预编码矩阵W满足W = W（1）W（ 2），其中从第一码本（1）中选择第一矩阵W（1），并且从第二码本中选择第二矩阵W（2）。 还公开了其他装置，系统和方法。
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公开(公告)号：US20140270023A1
公开(公告)日：2014-09-18
申请号：US14214497
申请日：2014-03-14
Applicant: NEC Laboratories America, Inc.
Inventor： Guosen Yue , Sampath Rangarajan
IPC: H04L27/02
CPC classification number: H04L27/02 , H04L27/3405 , H04L27/38
Abstract: Disclosed are methods and structures for soft symbol and variance estimation for QAM constellations including a big-flipping framework and efficient methods for soft symbol estimation and variance estimation for QAM. Disclosed are efficient Gray mapping which provides a much lower complexity, i.e., log N for N-QAM for both squared and non-squared QAM constellations. Also disclosed is an approximation method that avoids multiplications completely while exhibiting only a slight performance degradation. Finally, a low complexity method for variance estimations, particularly second moment estimations for both squared and non-squared QAM constellations with Gray mapping are disclosed. Advantageously—using the disclosed methods—the complexity of the second moment estimation is reduced to O((log N)̂2) for an N-QAM symbol for both squared and non-squared QAM.
Abstract translation: 公开了用于QAM星座的软符号和方差估计的方法和结构，包括大翻转框架和用于QAM的软符号估计和方差估计的有效方法。 公开的是高效的格雷映射，其提供了低得多的复杂度，即对于平方和非平方QAM星座的N-QAM的log N。 还公开了一种近似方法，其在仅显示轻微的性能降级的情况下完全避免乘法。 最后，公开了用于方差估计的低复杂度方法，特别是具有灰度映射的平方和非平方QAM星座的二次矩估计。 有利地，使用所公开的方法 - 对于平方和非平方QAM的N-QAM符号，二次矩估计的复杂度被减小到O（（log N）2）。
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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
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。
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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。
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