公开(公告)号：US09014290B2

公开(公告)日：2015-04-21

申请号：US14082695

申请日：2013-11-18

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad A. Khojastepour ,  Sampath Rangarajan

IPC: H04B7/02 ,  H04L25/03 ,  H04B7/04 ,  H04B7/06

CPC classification number: H04L25/03955 ,  H04B7/0417 ,  H04B7/0639 ,  H04L25/03898

Abstract: There is provided a method performed by a transmitter in a multi-user communication system. The method includes transmitting a first part of a codeword to a plurality of receivers over a communication channel in a transmission. The method further includes receiving feedback on the transmission of the first part of the codeword. The method also includes providing an artificial channel having channel parameters adjustable responsive to the received feedback. The method additionally includes virtually feeding the artificial channel with the first part of the codeword to generate artificial channel output data. The method further includes encoding a second part of the codeword for transmission to the plurality of receivers over the communication channel responsive to the artificial channel output data. The method also includes transmitting the encoded signals to the plurality of receivers over the communication channel.

Abstract translation: 提供了一种由多用户通信系统中的发射机执行的方法。 该方法包括通过传输中的通信信道将码字的第一部分发送到多个接收机。 该方法还包括接收关于码字的第一部分的传输的反馈。 该方法还包括提供具有响应于所接收的反馈可调节的信道参数的人造通道。 该方法还包括虚拟地将人造通道与码字的第一部分进行馈送以产生人造通道输出数据。 该方法还包括响应于人造渠道输出数据，通过通信通道对码字的第二部分进行编码以传输到多个接收机。 该方法还包括通过通信信道将编码信号发送到多个接收机。

公开(公告)号：US20130237239A1

公开(公告)日：2013-09-12

申请号：US13787985

申请日：2013-03-07

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： Rajesh Mahindra ,  Mohammad A. Khojastepour ,  Sampath Rangarajan ,  Honghai Zhang

IPC: H04W16/14

CPC classification number: H04W16/14 ,  H04W16/10

Abstract: A method implemented in an apparatus used in a radio access network (RAN) sharing system including a plurality of basestations is disclosed. The method includes estimating resource requirement or demand of one or more entities in each base station according to feedback from the plurality of basestations, computing resource allocation for said one or more entities, and enforcing the computed resource allocation using basestation-level virtualization. Other methods, apparatuses, and systems also are disclosed.

Abstract translation: 公开了一种在包括多个基站的无线电接入网络（RAN）共享系统中使用的装置中实现的方法。 该方法包括根据来自多个基站的反馈来估计每个基站中的一个或多个实体的资源需求或需求，计算所述一个或多个实体的资源分配，以及使用基站级虚拟化来执行所计算的资源分配。 还公开了其它方法，装置和系统。

公开(公告)号：US20140341064A1

公开(公告)日：2014-11-20

申请号：US14449307

申请日：2014-08-01

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Guosen Yue ,  Meilong Jiang ,  Mohammad A. Khojastepour ,  Sampath Rangarajan

IPC: H04W24/10 ,  H04B7/04

CPC classification number: H04W24/10 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0469 ,  H04B7/0486 ,  H04B7/0626 ,  H04B7/063 ,  H04B7/065

Abstract: A method implemented in a user equipment configured to be used in a multi-user (MU) multiple-input multiple-output (MIMO) wireless communications system is disclosed. The method includes transmitting to a base station a first channel state information (CSI) report determined according to a single-user (SU) MIMO rule, and transmitting to the base station a second CSI report determined according to an MU-MIMO rule. Other methods, apparatuses, and systems also are disclosed.

Abstract translation: 公开了一种在配置成在多用户（MU）多输入多输出（MIMO）无线通信系统中使用的用户设备中实现的方法。 该方法包括向基站发送根据单用户（SU）MIMO规则确定的第一信道状态信息（CSI）报告，以及向基站发送根据MU-MIMO规则确定的第二CSI报告。 还公开了其它方法，装置和系统。

公开(公告)号：US08891604B2

公开(公告)日：2014-11-18

申请号：US13629034

申请日：2012-09-27

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad A. Khojastepour ,  Xinyu Zhang ,  Karthikeyan Sundaresan ,  Sampath Rangarajan

IPC: H04B3/46 ,  H04B17/00 ,  H04Q1/20 ,  H04B7/04 ,  H04B7/02

CPC classification number: H04B7/0456 ,  H04B7/024

Abstract: In a multiple-input multiple-output (MIMO) wireless system supporting Coordinated Multi-Point (CoMP) transmission and having a first base station, a second base station, and a user equipment, a communications method implemented in the first base station is disclosed. In an aspect, the communications method includes exchanging, with the second base station through local information exchange, first information about a first channel between the first base station and the user equipment and second information about a second channel between the second base station and the user equipment, and computing at least one of a precoding matrix, a receiver filter, and a projection matrix, wherein the user equipment estimates the first information and the second information, and shares the first information and the second information with the first base station. Other apparatuses and some methods for wireless communications also are disclosed.

Abstract translation: 在支持协调多点（CoMP）传输并具有第一基站，第二基站和用户设备的多输入多输出（MIMO）无线系统中，公开了在第一基站中实现的通信方法 。 一方面，通信方法包括通过本地信息交换与第二基站交换关于第一基站和用户设备之间的第一信道的第一信息和关于第二基站与用户之间的第二信道的第二信息 设备，以及计算预编码矩阵，接收机过滤器和投影矩阵中的至少一个，其中用户设备估计第一信息和第二信息，并与第一基站共享第一信息和第二信息。 还公开了用于无线通信的其它装置和一些方法。

公开(公告)号：US20140233414A1

公开(公告)日：2014-08-21

申请号：US14248048

申请日：2014-04-08

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Guosen Yue ,  Mohammad A. Khojastepour ,  Meilong Jiang ,  Sampath Rangarajan

IPC: H04W24/08

CPC classification number: H04W24/08 ,  H04B7/0452 ,  H04B7/0465 ,  H04B7/0486 ,  H04W52/346 ,  H04W72/0406 ,  H04W72/085

Abstract: A method for determining attributes of communication channels of multi-user (MU)-multiple input multiple output (MIMO) users in an orthogonal frequency division multiplexing based multiple access (OFDMA) system is disclosed. The method comprises receiving from a base station, for at least one sub-band of contiguous sub-carriers, an indication of an estimate of or an upper-bound on a total number of streams that are co-scheduled by the base station on the at least one sub-band or an indication of a fraction of a transmit power at the base station that is applied to streams that are scheduled for transmission to a particular user, determining one or more signal quality measures for the at least one sub-band based on at least one of the fraction or the estimate of or the upper-bound on the total number of streams that are scheduled by the base station on the at least one sub-band, and transmitting to the base station an indication of the one or more signal quality measures. Other methods, apparatuses, and systems also are disclosed.

Abstract translation: 公开了一种用于在基于正交频分复用的多址（OFDMA）系统中确定多用户（MU） - 多输入多输出（MIMO））用户的通信信道的属性的方法。 该方法包括从基站接收对于连续子载波的至少一个子带，在基站上共同调度的流的总数的估计或上限的指示 至少一个子带或基站处的发射功率的一小部分的指示，其被施加到被调度用于传输到特定用户的流，确定用于所述至少一个子带的一个或多个信号质量度量 基于由所述基站在所述至少一个子带上调度的流的总数的分数或估计或上限中的至少一个，并且向所述基站发送所述一个的所述一个 或更多的信号质量措施。 还公开了其它方法，装置和系统。

公开(公告)号：US20140226745A1

公开(公告)日：2014-08-14

申请号：US14258378

申请日：2014-04-22

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Guosen Yue ,  Mohammad A. Khojastepour ,  Meilong Jiang ,  Sampath Rangarajan

IPC: H04B7/04 ,  H04L27/34

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 multi-user multiple input multiple output (MU-MIMO) wireless communications system is disclosed. The method includes receiving from a base station an indication of a first modulation type for the user equipment, receiving a first data signal for the user equipment, receiving a second data signal for a co-scheduled user equipment, where a second modulation type for the co-scheduled user equipment is unknown to the user equipment, and deciding the second modulation type. Other methods, systems, and apparatuses also are disclosed.

Abstract translation: 公开了一种在多用户多输入多输出（MU-MIMO）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，接收用户设备的第一数据信号，为共同调度的用户设备接收第二数据信号，其中第二调制类型为 共同调度的用户设备对于用户设备是未知的，并且确定第二调制类型。 还公开了其它方法，系统和装置。