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公开(公告)号：US11580317B2
公开(公告)日：2023-02-14
申请号：US16817115
申请日：2020-03-12
Applicant: NEC Laboratories America, Inc.
Inventor： Mustafa Arslan , Mohammad Khojastepour , Shasha Li , Sampath Rangarajan
Abstract: Systems and methods for determining radio-frequency identification (RFID) tag proximity groups are provided. The method includes receiving RFID tag readings from multiple RFID tags. The method includes determining signal strengths of the RFID tag readings. The method includes determining pairs of RFID tags based on the RFID tag readings. The method also includes implementing a twin recurrent neural network (RNN) to determine proximity groups of RFID tags based on distance similarity over time between each of the pairs of the RFID tags.
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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.
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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
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.
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公开(公告)号：US10477472B2
公开(公告)日：2019-11-12
申请号：US15271064
申请日：2016-09-20
Applicant: NEC Laboratories America, Inc.
Inventor： Narayan Prasad , Sampath Rangarajan , Hajar Mahdavi-Doost
Abstract: A method is provided for optimizing energy efficiency over an energy-harvesting Long Term Evolution cellular network. The method includes assigning (a) resource blocks, (b) transmission modes, and (c) bit loadings on the resource blocks to a set of users such that (i) the assigned resource blocks satisfy a system of linear ascending inequality constraints, and (ii) respective sums of the bit loadings for each of the users do not exceed respective queue sizes pertaining to the each of the users. The method further includes incorporating a resource block and transmission mode assignment for a user into downlink scheduler of a base station to cause the downlink scheduler to perform downlink scheduling in accordance with the resource block and transmission mode assignment.
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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.
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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.
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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
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.
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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.
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公开(公告)号：US09813922B2
公开(公告)日：2017-11-07
申请号：US14812580
申请日：2015-07-29
Applicant: NEC Laboratories America, Inc.
Inventor： Narayan Prasad , Vaibhav Singh , Sampath Rangarajan
IPC: H04W24/02 , H04W28/02 , H04L12/891 , H04W72/04
CPC classification number: H04W24/02 , H04L47/41 , H04W28/02 , H04W72/0446
Abstract: A system and method for resource management in a heterogeneous wireless network wherein the resources of the mobile communications system are managed on a coarse time-scale and a fine time-scale. The coarse time-scale management comprises a first stage of determining the user association for each of the plurality of TPs followed by a second stage of determining activation fractions for all TPs. The determining of the user association is performed by utilizing a GLS procedure having a Greedy Stage and a Local Search Stage. In the Greedy Stage, new user, TP pairs are analyzed and the pair with the greatest improvement in system utility is selected. In the Local Search Stage, potential swaps are analyzed and a pair offering the greatest improvement that exceeds a threshold is selected. The determining of activation fractions for all TPs is performed by utilizing an auxiliary function method.
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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
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.
