公开(公告)号：US09736785B2

公开(公告)日：2017-08-15

申请号：US14560723

申请日：2014-12-04

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Karthikeyan Sundaresan ,  Eugene Chai ,  Sampath Rangarajan

IPC: H04W52/14 ,  H04B7/0413 ,  H04B7/0456 ,  H04B15/00 ,  H04L5/16 ,  H04W72/04 ,  H04W72/08 ,  H04B7/04 ,  H04L5/00 ,  H04W52/24 ,  H04B17/345 ,  H04B7/022 ,  H04B7/06

CPC classification number: H04W52/14 ,  H04B7/022 ,  H04B7/0413 ,  H04B7/0421 ,  H04B7/0456 ,  H04B7/0619 ,  H04B15/00 ,  H04B17/345 ,  H04L5/0048 ,  H04L5/16 ,  H04W52/241 ,  H04W72/0406 ,  H04W72/082

Abstract: An interference alignment system for communication structures that includes a single cell channel comprising an access point node, and a full bipartite interference channel (FBIC) configuration of a plurality of receiving nodes and a plurality of transmitting nodes. Each receiving node sees an interfering signal from all transmitting nodes. The access point node of the single cell channel provides a single node having downlink channels to all receiving nodes in the FBIC, and all of the uplink channels from the FBIC are to the single access point node to the single cell channel.

公开(公告)号：US09723566B2

公开(公告)日：2017-08-01

申请号：US14818427

申请日：2015-08-05

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Karthikeyan Sundaresan ,  Eugene Chai ,  Sampath Rangarajan

IPC: H04W52/14 ,  H04B7/0413 ,  H04B7/0456 ,  H04B15/00 ,  H04L5/16 ,  H04W72/04 ,  H04W72/08 ,  H04B7/04 ,  H04L5/00 ,  H04W52/24 ,  H04B17/345 ,  H04B7/022 ,  H04B7/06

CPC classification number: H04W52/14 ,  H04B7/022 ,  H04B7/0413 ,  H04B7/0421 ,  H04B7/0456 ,  H04B7/0619 ,  H04B15/00 ,  H04B17/345 ,  H04L5/0048 ,  H04L5/16 ,  H04W52/241 ,  H04W72/0406 ,  H04W72/082

Abstract: A method implemented in a wireless communications system including a first uplink (UL) client device, a second UL client device, a first downlink (DL) client device, and an access point (AP) is disclosed. The method comprises the following steps in this order: a) determining interference alignment (IA) solution between the first and second UL client devices and the first device; and b) determining, according to the IA solution, receive filter U0 for the AP and precoder V0 for the AP to improve a UL stream rate and a DL stream rate. Other methods, systems, and apparatuses also are disclosed.

公开(公告)号：US20170094546A1

公开(公告)日：2017-03-30

申请号：US15270864

申请日：2016-09-20

Applicant: NEC Laboratories America, Inc.

Inventor： Eugene Chai ,  Mohammad Khojastepour ,  Sampath Rangarajan ,  Karthikeyan Sundaresan ,  Krishna Garikipati

IPC: H04W24/10 ,  H04W48/18 ,  H04W72/04 ,  H04W72/08

CPC classification number: H04W24/10 ,  H04W16/14 ,  H04W48/18 ,  H04W72/0446 ,  H04W72/082 ,  H04W72/1215 ,  H04W74/0816 ,  H04W84/042 ,  H04W84/12 ,  H04W88/10

Abstract: Systems and methods for improving Long Term Evolution (LTE)-WiFi coexistence in a network, including configuring one or more LTE nodes for asynchronous access and synchronous transmission to bridge LTE and WiFi access modes. A channel is reserved for LTE transmission in the one or more LTE nodes, and a supplementary WiFi module is provided in the one or more LTE nodes for sensing the channel for occupancy and for broadcasting a reservation signal on the channel prior to the LTE transmission. Contention window sizes are scaled linearly by increasing the contention window sizes proportionally to a subframe collision rate to maintain throughput fairness to the WiFi, and synchronous transmission from the one or more LTE nodes to one or more User Devices (UEs) is performed by activating the unlicensed carrier for a reserved time period.

公开(公告)号：US20160269941A1

公开(公告)日：2016-09-15

申请号：US15057272

申请日：2016-03-01

Applicant: NEC Laboratories America, Inc.

Inventor： Eugene Chai ,  Karthikeyan Sundaresan ,  Mohammad Khojastepour ,  Sampath Rangarajan ,  Krishna Garikipati

IPC: H04W28/26 ,  H04L12/26 ,  H04L12/851 ,  H04W28/12 ,  H04L12/801

CPC classification number: H04L47/24 ,  H04L43/0829 ,  H04L43/0852 ,  H04L47/14 ,  H04W28/12 ,  H04W74/0816 ,  H04W80/00 ,  H04W88/10

Abstract: Methods and systems of asynchronous access and synchronous transmission include transmitting an initial reservation packet using a first protocol to prevent other devices that use the first protocol from transmitting during a reserved duration. A carrier using a second protocol is activated. Information is transmitted using a second protocol during the reserved duration. During a last subframe of the reserved duration, an additional reservation packet is transmitted using the first protocol to extend the reserved duration. The transmission of the additional reservation packet takes place while the carrier using the second protocol is still active.

Abstract translation: 异步访问和同步传输的方法和系统包括使用第一协议发送初始预留分组，以防止在保留持续时间期间使用第一协议的其他设备进行传输。 使用第二协议的载波被激活。 在保留期间内使用第二协议发送信息。 在保留持续时间的最后一个子帧期间，使用第一协议传输附加的预留分组以延长预留的持续时间。 当使用第二协议的载波仍然有效时，发生附加预约分组。

公开(公告)号：US20150381335A1

公开(公告)日：2015-12-31

申请号：US14818447

申请日：2015-08-05

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Karthikeyan Sundaresan ,  Eugene Chai ,  Sampath Rangarajan

IPC: H04L5/16 ,  H04B15/00 ,  H04W72/04 ,  H04B7/04 ,  H04L5/00

CPC classification number: H04W52/14 ,  H04B7/022 ,  H04B7/0413 ,  H04B7/0421 ,  H04B7/0456 ,  H04B7/0619 ,  H04B15/00 ,  H04B17/345 ,  H04L5/0048 ,  H04L5/16 ,  H04W52/241 ,  H04W72/0406 ,  H04W72/082

Abstract: A method implemented in an access point (AP) used in a wireless communications system including a first uplink (UL) client device, a second UL client device, and a first downlink (DL) client device is disclosed. The method comprises: receiving, from the first DL client device, first composite channel matrix M1 comprising a first channel matrix and a second channel matrix, wherein the first DL client device estimates the first channel matrix and the second channel matrix. Other methods, systems, and apparatuses also are disclosed.

Abstract translation: 公开了在包括第一上行链路（UL）客户端设备，第二UL客户端设备和第一下行链路（DL）客户端设备的无线通信系统中使用的接入点（AP）中实现的方法。 该方法包括：从第一DL客户端设备接收包括第一信道矩阵和第二信道矩阵的第一复合信道矩阵M1，其中第一DL客户端设备估计第一信道矩阵和第二信道矩阵。 还公开了其它方法，系统和装置。

公开(公告)号：US20150381334A1

公开(公告)日：2015-12-31

申请号：US14818427

申请日：2015-08-05

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Karthikeyan Sundaresan ,  Eugene Chai ,  Sampath Rangarajan

IPC: H04L5/16 ,  H04W72/08 ,  H04B7/04 ,  H04W72/04

CPC classification number: H04W52/14 ,  H04B7/022 ,  H04B7/0413 ,  H04B7/0421 ,  H04B7/0456 ,  H04B7/0619 ,  H04B15/00 ,  H04B17/345 ,  H04L5/0048 ,  H04L5/16 ,  H04W52/241 ,  H04W72/0406 ,  H04W72/082

Abstract: A method implemented in a wireless communications system including a first uplink (UL) client device, a second UL client device, a first downlink (DL) client device, and an access point (AP) is disclosed. The method comprises the following steps in this order: a) determining interference alignment (IA) solution between the first and second UL client devices and the first device; and b) determining, according to the IA solution, receive filter U0 for the AP and precoder V0 for the AP to improve a UL stream rate and a DL stream rate. Other methods, systems, and apparatuses also are disclosed.

Abstract translation: 公开了一种在包括第一上行链路（UL）客户端设备，第二UL客户端设备，第一下行链路（DL）客户端设备和接入点（AP））的无线通信系统中实现的方法。 该方法包括以下步骤：a）确定第一和第二UL客户端设备与第一设备之间的干扰对准（IA）解决方案; 以及b）根据IA解决方案确定接收用于AP的滤波器U0和用于AP的预编码器V0以改善UL流速率和DL流速率。 还公开了其它方法，系统和装置。

公开(公告)号：US20150372743A1

公开(公告)日：2015-12-24

申请号：US14742039

申请日：2015-06-17

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Karthikeyan Sundaresan

IPC: H04B7/06 ,  H04B15/00 ,  H04L5/14

CPC classification number: H04B7/0634 ,  H04B7/0456 ,  H04B2215/00 ,  H04L5/0023 ,  H04L5/0035 ,  H04L5/0073 ,  H04L5/143 ,  H04L25/03343 ,  H04L25/03898

Abstract: Systems and methods for full-duplex communication in a communications network, including generating a combined channel matrix including two or more channel matrices and determining a null space and a basis for the combined channel matrix. Common, individual, and disjoint vector spaces are determined, and common vector space is determined for each of one or more receiving nodes and each or one or more transmitting nodes, disjoint vector spaces for each of the one or more nodes are determined based on the common vector space for each of the one or more nodes, and individual vector spaces are determined based on the common and the disjoint vector spaces. Signals are mapped at each of the nodes to determine corresponding vector spaces; and interference alignment is performed in common vector spaces and zero forcing in disjoint vector spaces using a hardware processor.

Abstract translation: 包括生成包括两个或更多个信道矩阵并且确定零空间的组合信道矩阵以及组合信道矩阵的基础的用于通信网络中的全双工通信的系统和方法。 确定公共，个体和不相交向量空间，并且为一个或多个接收节点中的每一个确定公共向量空间，并且基于所述一个或多个接收节点确定每个或一个或多个发送节点，所述一个或多个节点中的每一个的不相交向量空间 基于公共和不相交向量空间来确定一个或多个节点中的每一个的公共向量空间以及各个向量空间。 信号被映射到每个节点以确定相应的向量空间; 并且使用硬件处理器在公共向量空间中执行干涉对准并且在不相交的向量空间中执行零强制。

公开(公告)号：US20150117370A1

公开(公告)日：2015-04-30

申请号：US14527801

申请日：2014-10-30

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad, I ,  Mohammad Khojastepour ,  Mustafa Arslan ,  Karthikeyan Sundaresan ,  Sampath Rangarajan

IPC: H04L5/00 ,  H04B7/04

CPC classification number: H04B7/0626 ,  H04B7/024 ,  H04L5/0035 ,  H04L5/0053 ,  H04L5/0057

Abstract: A wireless communications method implemented in a transmission point (TP) used in a mobile communications system is disclosed. The wireless communications method includes receiving, from a user equipment (UE), short-term channel state information (short-term CSI), processing the short-term CSI, and transmitting, to another TP, the processed short-term CSI. Other methods, systems, and apparatuses also are disclosed.

Abstract translation: 公开了一种在移动通信系统中使用的传输点（TP）中实现的无线通信方法。 无线通信方法包括从用户设备（UE）接收短期信道状态信息（短期CSI），处理短期CSI，并向另一TP发送经处理的短期CSI。 还公开了其它方法，系统和装置。

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。

公开(公告)号：US20250159192A1

公开(公告)日：2025-05-15

申请号：US18941015

申请日：2024-11-08

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Srimat Chakradhar ,  Matin Mortaheb

IPC: H04N19/147 ,  G06V10/82 ,  G06V20/40 ,  H04N19/126 ,  H04N19/172

Abstract: Systems and methods for a deep learning-based quality control for video compression. Video quality of a streaming media can be updated using an optimized quantization parameters (QP). Optimized QP can be predicted from the video chunks and their respective QP that conforms to a peak signal-to-noise ratio (PSNR) threshold while minimizing an encoded video bitrate of the compressed video by utilizing a trained video quality control unit. Video chunks can be encoded with respective QP. Video chunks can be partitioned from video data obtained from the streaming media.