公开(公告)号：US20210264122A1

公开(公告)日：2021-08-26

申请号：US17171172

申请日：2021-02-09

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Carlos Bocanegra

IPC: G06K7/10 ,  H04L1/16 ,  G06K9/62

Abstract: A computer-implemented method is provided for picking a 16-bit random sequence (RN16) and generating an acknowledgement packet in a tag reading session. The method includes decoding RN16s from signals received by a plurality of antennas by treating signal interference as noise. The method further includes selecting the RN16 from the decoded RN16s based on properties of the decoded RN16s and the signals from which they are decoded in the tag reading session. The method also includes generating the acknowledgement packet based on the selected RN16.

公开(公告)号：US20200226331A1

公开(公告)日：2020-07-16

申请号：US16565770

申请日：2019-09-10

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Mustafa Arslan ,  Sampath Rangarajan

IPC: G06K7/10 ,  G07G1/00 ,  H04B1/00 ,  H04L5/14

Abstract: Systems and methods for implementing a radio frequency identifier (RFID) system are provided. The methods include transmitting a radio frequency (RF) signal, by an RFID interrogator with multiple antennas. The methods include receiving a superimposed received signal. The superimposed received signal includes replies from a first RFID tag and a second RFID tag that are overlapping in time. The methods also include separating the replies from the first RFID tag and second RFID tag though spatial processing of the superimposed received signal.

公开(公告)号：US10455636B2

公开(公告)日：2019-10-22

申请号：US15678681

申请日：2017-08-16

Applicant: NEC Laboratories America, Inc.

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

IPC: H04W76/04 ,  H04W76/20 ,  H04W24/08 ,  H04B17/336

Abstract: A computer-implemented method for establishing communication links in a millimeter wave (mmWave) network by solving a linear integer packing problem is presented. The computer-implemented method includes determining active communication links between a plurality of transmitters and a plurality of receivers, setting each active communication link to have any arbitrary chosen weight or priority, and setting a minimum link quality threshold for each active communication link and subjecting each active communication link to constraints. Detected phantom constraints are mitigated by introducing new constraints with binary coefficients and by modifying one or more existing constraints by setting a number of coefficients within the existing constraints to zero.

公开(公告)号：US20180270849A1

公开(公告)日：2018-09-20

申请号：US15915491

申请日：2018-03-08

Applicant: NEC Laboratories America, Inc.

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

IPC: H04W72/12 ,  H04W56/00 ,  H04W48/16

Abstract: A system is provided for speculative scheduling that includes a base station having a processor. The processor computes an overall schedule for a set of clients. The overall schedule is formed from a set of speculative schedules, is configured to maximize unlicensed spectrum usage, and is computed by (a) determining a speculative schedule for each resource block from a set of resource blocks in a given sub-frame based on statistics determined for the clients individually and jointly, and (b) selecting, for formation into the overall schedule, (i) a particular resource block and (ii) the speculative schedule for the particular resource block, that yield the maximum incremental utility relative to already determined speculative schedules for other resource blocks in the set, based on criteria including uplink access statistics. The processor executes the overall schedule responsive to a completion of the speculative schedule determination for each resource block in the given sub-frame.

公开(公告)号：US20180213415A1

公开(公告)日：2018-07-26

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 ,  H04W16/28 ,  H04W72/04

CPC classification number: H04W24/02 ,  H04B7/0695 ,  H04W16/28 ,  H04W72/044

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.

公开(公告)号：US09936414B2

公开(公告)日：2018-04-03

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 ,  H04W16/14 ,  H04W74/08 ,  H04W84/04 ,  H04W84/12 ,  H04W72/12

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：US09722720B2

公开(公告)日：2017-08-01

申请号：US14811268

申请日：2015-07-28

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Karthikeyan Sundaresan ,  Sampath Rangarajan

IPC: H04B7/04 ,  H04J11/00 ,  H04B7/024

CPC classification number: H04J11/005 ,  H04B7/024

Abstract: A method, system, and computer program product for minimizing intra-cell and inter-cell interference in a multi-cell full duplex communication system in a wireless network. The method includes selecting, by a client selector, a plurality of clients, wherein the plurality of clients includes a plurality of uplink clients configured to transmit signals and a plurality of downlink clients configured to receive signals over a plurality of data streams in each cell of the multi-cell full duplex communication system, and performing, by a spatial interference aligner, spatial interference alignment on interfering data streams to align the interfering data streams of uplink clients towards downlink clients in its own cell and downlink clients in a neighboring cell.

公开(公告)号：US20170161109A1

公开(公告)日：2017-06-08

申请号：US15362439

申请日：2016-11-28

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Rajesh Mahindra ,  Sampath Rangarajan ,  Karthikeyan Sundaresan

IPC: G06F9/50 ,  H04L29/08

CPC classification number: G06F9/505 ,  G06F9/5061 ,  H04L67/10 ,  H04L67/1031

Abstract: Computer-implemented methods and a system are provided for distributing tasks between a plurality of processes in a computer network. A method includes distributing, by a load balancer in the computer network, tasks between the plurality of processes. The method further includes maintaining, by the load balancer, a registry for each of the tasks. For a given task, the registry indicates which of the plurality of processes to which the given task is distributed based on a hash function. The method also includes forming, by the load balancer, a respective set of registries for each of the plurality of processes, based on a set of thresholds. The method additionally includes redefining, by the load balancer, the set of thresholds when one of the plurality of processes ceases or a new process, added to the plurality of processes, commences.

公开(公告)号：US09385899B2

公开(公告)日：2016-07-05

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 ,  H04L25/03 ,  H04B7/06 ,  H04L1/06

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：US20160036504A1

公开(公告)日：2016-02-04

申请号：US14811268

申请日：2015-07-28

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Karthikeyan Sundaresan ,  Sampath Rangarajan

IPC: H04B7/04 ,  H04W72/04 ,  H04J11/00 ,  H04L5/14

CPC classification number: H04J11/005 ,  H04B7/024

Abstract: A method, system, and computer program product for minimizing intra-cell and inter-cell interference in a multi-cell full duplex communication system in a wireless network. The method includes selecting, by a clint selector, a plurality of clients, wherein the plurality of clients includes a plurality of uplink clients configured to transmit signals and a plurality of downlink clients configured to receive signals over a plurality of data streams in each cell of the multi-cell full duplex communication system, and performing, by a spatial interference aligner, spatial interference alignment on interfering data streams to align the interfering data streams of uplink clients towards downlink clients in its own cell and downlink clients in a neighboring cell.

Abstract translation: 一种用于最小化无线网络中的多小区全双工通信系统中的小区内和小区间干扰的方法，系统和计算机程序产品。 该方法包括通过选择器选择多个客户端，其中多个客户端包括被配置为发送信号的多个上行链路客户端和被配置成通过多个数据流中的每个小区中的多个数据流接收信号的多个下行链路客户端 多小区全双工通信系统，并且通过空间干扰对准器执行干扰数据流上的空间干扰对准，以将上行链路客户端的干扰数据流对准相邻小区中其自己的小区和下行链路客户端中的下行链路客户端。