公开(公告)号：US10405209B2

公开(公告)日：2019-09-03

申请号：US15915436

申请日：2018-03-08

Applicant: NEC Laboratories America, Inc.

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

IPC: H04W24/02 ,  H04W72/08 ,  H04W24/10 ,  H04W16/22 ,  H04W16/14

Abstract: A system, method, and computer program product are provided for blue-printing interference for mobile access in an unlicensed spectrum of a synchronous scheduled cellular access system. The system includes a cellular base station having a processor. The processor constructs and executes an intelligent measurement schedule of clients for uplink transmissions to obtain access measurements for the uplink transmissions. The intelligent measurement schedule is constructed for scalable access measurement overhead. The access measurements indicate interference dependencies between the clients. The processor estimates an interference topology and statistics of the interference topology, from the access measurements to form an interference blueprint. The processor adjusts the intelligent measurement schedule to overschedule the clients for the uplink transmissions to reduce spectrum utilization loss while minimizing client transmission collisions, based on the interference blueprint. The processor initiates the uplink transmissions for the clients in accordance with the adjusted intelligent measurement schedule.

公开(公告)号：US10346655B2

公开(公告)日：2019-07-09

申请号：US15833995

申请日：2017-12-06

Applicant: NEC Laboratories America, Inc.

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

IPC: G06K7/10 ,  G06K19/07 ,  G06N20/00

Abstract: Aspects of the present disclosure describe a battery-free touch sensing user interface (UI) for Internet of Things (IoT) and other smart spaces employing Radio Frequency Identification (RFID) readers and tags that we call RIO. With RIO, any surface may be a touch-aware surface by attaching RFID tag(s) thereto. RIO advantageously supports custom-designed RFID tags and therefore facilitates customized UIs to be easily deployed in a real-world environment. RIO employs impedance tracking that results from a human finger—or other appendage—touching a surface of an RFID tag, thereby changing a characteristic impedance of the RFID tag antenna. This change manifests as a change in the phase of the RFID backscattered signal and is advantageously used by RIO to track fine-grained touch movement over the RFID tag. Disclosed further are multi-tag environments in which RIO operates and demonstrations including continuous tracking of finger movement during a swipe to within 3 mm of its actual position.

公开(公告)号：US20180307877A1

公开(公告)日：2018-10-25

申请号：US15954083

申请日：2018-04-16

Applicant: NEC Laboratories America, Inc.

Inventor： Karthikeyan Sundaresan ,  Eugene Chai ,  Sampath Rangarajan

IPC: G06K7/10 ,  G06Q20/18

CPC classification number: G06K7/10366 ,  G06K7/10009 ,  G06K7/10356 ,  G06Q20/18 ,  G07G1/0081 ,  G07G1/009

Abstract: Systems and a method are provided for use with a shopping cart in a store. A system includes Radio-Frequency Identification (RFID) tags, including item RFID tags associated with items for sale and reference RFID tags associated with various aisles in the store, for providing RFID data. The system further includes a RFID reader, operatively coupled to the shopping cart, and configured to the read RFID data from the item RFID tags and the reference RFID tags, extract features from the RFID data, identify any of the items having feature values associated therewith greater than a threshold amount as inside-cart items to be processed during an automatic checkout, and perform the automatic checkout on only the inside-cart items.

公开(公告)号：US09813995B2

公开(公告)日：2017-11-07

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: 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 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.

公开(公告)号：US20150223173A1

公开(公告)日：2015-08-06

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 ,  H04W28/04 ,  H04B1/10

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.

Abstract translation: 一种用于通信结构的干扰对准系统，其包括包括接入点节点的单个小区信道以及多个接收节点和多个发射节点的完全二分干扰信道（FBIC）配置。 每个接收节点看到来自所有发射节点的干扰信号。 单个小区信道的接入点节点向FBIC中的所有接收节点提供具有下行链路信道的单个节点，并且来自FBIC的所有上行链路信道都到单个小区信道的单个接入点节点。

公开(公告)号：US20240061079A1

公开(公告)日：2024-02-22

申请号：US18452690

申请日：2023-08-21

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Eugene Chai

IPC: G01S7/41 ,  G01S13/87 ,  G01S13/42

CPC classification number: G01S7/415 ,  G01S13/872 ,  G01S13/42

Abstract: Methods and systems for object localization include identifying associations between measurements taken from radar sensors. A shared coordinate system for the radar sensors is determined based the identified associations, including identifying translations and rotations between local coordinate systems of the radar sensors. A position of an object in the shared coordinate systems is determined, based on measurements of the object by the radar sensors. An action is performed responsive to the determined position of the object.

公开(公告)号：US11651664B2

公开(公告)日：2023-05-16

申请号：US17171143

申请日：2021-02-09

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Mustafa Arslan ,  Sampath Rangarajan ,  Eugene Chai ,  Carlos Bocanegra

IPC: G07G1/00 ,  G06Q20/20 ,  G06K7/10 ,  G06K19/07 ,  G06N3/04 ,  G06N3/08 ,  G06Q10/08 ,  G06Q20/18 ,  G07C9/00 ,  G06Q10/087

CPC classification number: G07G1/009 ,  G06K7/10297 ,  G06K19/0723 ,  G06N3/04 ,  G06N3/08 ,  G06Q10/087 ,  G06Q20/18 ,  G06Q20/203 ,  G06Q20/204 ,  G06Q20/208 ,  G07C9/00

Abstract: Systems and methods for self-checkout at a point-of-sale are provided. The system and method includes using a plurality of radio frequency identification (RFID) transceivers within a store, and an RFID reader configured to receive an RFID code from an RFID tag activated by the plurality of radio frequency identification (RFID) transceivers. The system and method also includes using a classifier configured to determine whether the RFID tag is inside or outside a designated area, wherein the classifier is trained in a manner that a number of items incorrectly identified as being purchased is below a threshold to minimize customer dissatisfaction (CDS) determined as the ratio of the value of items charged to the customer but not purchased by a customer to the total charge to the customer.

公开(公告)号：US20210248879A1

公开(公告)日：2021-08-12

申请号：US17171155

申请日：2021-02-09

Applicant: NEC Laboratories America, Inc.

Inventor： Mohammad Khojastepour ,  Mustafa Arslan ,  Sampath Rangarajan ,  Eugene Chai ,  Carlos Bocanegra

IPC: G07G1/00 ,  G06Q20/20

Abstract: Systems and methods for is provided for self-checkout at a point-of-sale. The system and method includes a plurality of radio frequency identification (RFID) transceivers, an RFID reader, wherein the RFID reader is configured to receive a response with an RFID code from each of a plurality of RFID tags activated simultaneously by at least one of the plurality of radio frequency identification (RFID) transceivers, and decode the RFID code from the response received from each of the RFID tags, and a classifier configured to determine whether each of the plurality of RFID tags is inside or outside a walk-through checkout area inside a store, wherein the system calculates an amount charged to a customer based on the cost of the items identified as within the walk-through checkout area.

公开(公告)号：US10852416B2

公开(公告)日：2020-12-01

申请号：US16582416

申请日：2019-09-25

Applicant: NEC Laboratories America, Inc.

Inventor： Karthikeyan Sundaresan ,  Eugene Chai ,  Sampath Rangarajan

IPC: G08B21/00 ,  G01S13/76 ,  H01Q1/22 ,  G06K19/07 ,  G01S13/75 ,  G08B13/24

Abstract: An in-store interaction and location system is provided. At least one RF backscatter transmitter, hosted on a device, is configured to emit a RF signal on a frequency. A set of passive RF backscatter tags, each associated with a respective one of a plurality of products in a given store area, is configured to reflect and frequency shift the RF signal to a different frequency. At least one RF backscatter receiver, hosted on another device, is configured to read the plurality of products on the different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the RF signal by the passive RF backscatter tag. At least one of the device and the other device is configured to maintain an inventory and a location of the plurality of products in the given store area and provide the inventory and location to a user device.

公开(公告)号：US10852415B2

公开(公告)日：2020-12-01

申请号：US16582364

申请日：2019-09-25

Applicant: NEC Laboratories America, Inc.

Inventor： Karthikeyan Sundaresan ,  Eugene Chai ,  Sampath Rangarajan

IPC: G08B21/00 ,  G01S13/76 ,  H01Q1/22 ,  G06K19/07 ,  G01S13/75 ,  G08B13/24

Abstract: A navigation assistance system is provided. At least one RF backscatter transmitter, hosted on a device, is configured to emit a RF signal on a frequency. A set of passive RF backscatter tags, each associated with a respective one of a plurality of navigation markers in a given venue, is configured to reflect the RF signal and frequency shift the RF signal to a different frequency. At least one RF backscatter receiver is configured to read the navigation markers on the different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the RF signal by the passive RF backscatter tag. At least one of the device hosting the at least one RF backscatter transmitter and the other device hosting the at least one RF backscatter receiver is configured to maintain an inventory of locations of the navigation markers in the given venue.