-
公开(公告)号：US10852414B2
公开(公告)日：2020-12-01
申请号：US16582314
申请日：2019-09-25
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan
Abstract: An in-home inventory 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 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 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 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 and location of the products in the given area.
-
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
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：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：US20150381248A1
公开(公告)日：2015-12-31
申请号：US14818451
申请日：2015-08-05
Applicant: NEC Laboratories America, Inc.
Inventor： Mohammad Khojastepour , Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan
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) having N antennas used in a wireless communications system including two first client devices each of which has M antennas and two second client devices each of which has N antennas, where M and N are even is disclosed. The method comprises: performing interference alignment (IA) in common vector spaces; and delivering M+N streams. Other methods, systems, and apparatuses also are disclosed.
Abstract translation: 公开了一种在具有N个天线的接入点（AP）中实现的方法，该无线通信系统包括具有M个天线的两个第一客户端设备和每个具有N个天线的两个第二客户端设备，其中M和N是偶数的无线通信系统 。 该方法包括：在公共矢量空间中执行干涉对准（IA）; 并提供M + N个流。 还公开了其它方法，系统和装置。
-
公开(公告)号：US11620462B2
公开(公告)日：2023-04-04
申请号：US17202854
申请日：2021-03-16
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan , Mohammad Rostami
Abstract: A method for product tagging is presented including emitting, by at least one RF backscatter transmitter, a dual-tone Radio Frequency (RF) signal embedded within a standardized RF signal on a frequency channel, reflecting and frequency shifting, by a passive RF backscatter tag associated with a product, the dual-tone RF signal to a different frequency channel, and reading, by at least one RF backscatter receiver, the product on the different frequency channel by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the dual-tone RF signal by the passive RF backscatter tag.
-
Patent Agency Ranking
公开(公告)号：US10936927B2
公开(公告)日：2021-03-02
申请号：US16743737
申请日：2020-01-15
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan , Mohammad Rostami
Abstract: A product tagging system is provided. The product tagging system includes at least one RF backscatter transmitter configured to emit (i) a main carrier RF signal, and (ii) Radio Frequency (RF) signals on two frequencies whose summation forms a twin carrier RF signal. The product tagging system further includes a passive RF backscatter tag associated with a product and configured to reflect and frequency shift the main carrier RF signal to a different frequency using the twin carrier RF signal. The product tagging system also includes at least one RF backscatter receiver configured to read the product on the different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the main carrier RF signal by the passive RF backscatter tag.
-
公开(公告)号：US20200018847A1
公开(公告)日：2020-01-16
申请号：US16582416
申请日：2019-09-25
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan
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：US20190317206A1
公开(公告)日：2019-10-17
申请号：US16381294
申请日：2019-04-11
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan
Abstract: A product tagging system is provided. The product tagging system includes at least one RF backscatter transmitter configured to emit a Radio Frequency (RF) signal on a frequency. The product tagging system further includes a passive RF backscatter tag associated with a product and configured to reflect and frequency shift the RF signal to a different frequency. The product tagging system also includes at least one RF backscatter receiver configured to read the product 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.
-
公开(公告)号：US10292054B2
公开(公告)日：2019-05-14
申请号：US15422085
申请日：2017-02-01
Applicant: NEC Laboratories America, Inc.
Inventor： Mohammad Khojastepour , Eugene Chai , Karthikeyan Sundaresan , Sampath Rangarajan
Abstract: Methods and a system are provided for enabling coexistence of WIFI and Long Term Evolution (LTE) in a wireless communication system. A method includes embedding in a data sequence, by a base station capable of transmitting and receiving LTE frames, a channel reservation packet that (i) is detectable by a WIFI receiver and (ii) reserves a particular one of a plurality of available unlicensed communication channels for a transmission duration of the data sequence. The method further includes transmitting, by the base station, the data sequence including the embedded channel reservation packet.
-
公开(公告)号：US10091114B2
公开(公告)日：2018-10-02
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: H04W4/00 , H04L12/851 , H04W28/12 , H04L12/801 , H04W74/08 , H04W80/00 , H04L12/26 , 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.
-
-
-
-
-
-
-
-
-
Search Results
56
records
(took 0.019 seconds)
