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    DISTRIBUTED HYBRID BEAMFORMING
    2.
    发明公开
    DISTRIBUTED HYBRID BEAMFORMING 审中-公开

    公开(公告)号：US20240137086A1

    公开(公告)日：2024-04-25

    申请号：US18483931

    申请日：2023-10-10

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Nariman Torkzaban

    IPC: H04B7/06 ,  H04B7/08

    CPC classification number: H04B7/0617 ,  H04B7/086

    Abstract: Transmission methods and systems include calibrating a mismatch between uplink and downlink digital elements of hybrid beamforming transceivers. calibrating a mismatch between uplink and downlink analog elements of the plurality of hybrid beamforming transceivers. Respective downlink channels are estimated between a user equipment and the hybrid beamforming transceivers using respective mismatch calibrations for the digital and analog elements of each of the hybrid beamforming transceivers. Data is transmitted to the user equipment from the hybrid beamforming transceivers using a distributed beamforming pattern based on the estimated downlink channels.

    Shaping mmWave wireless channel via multi-beam design using reconfigurable intelligent surfaces
    3.
    发明授权
    Shaping mmWave wireless channel via multi-beam design using reconfigurable intelligent surfaces 有权

    公开(公告)号：US11909479B2

    公开(公告)日：2024-02-20

    申请号：US17863720

    申请日：2022-07-13

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Nariman Torkzaban

    IPC: H04B7/06 ,  H04B7/10 ,  H04B7/155

    CPC classification number: H04B7/0617 ,  H04B7/10 ,  H04B7/15507

    Abstract: A method for shaping a mmWave wireless channel in a wireless network is presented. The method includes enabling communication between a multi-antenna transmitter and a multi-antenna receiver, positioning a reconfigurable intelligent surface (RIS) in a vicinity of the multi-antenna transmitter and the multi-antenna receiver, constructing the RIS as a uniform planar array (UPA) structure forming a multi-beamforming framework, a surface of the UPA defining an array of discrete elements arranged in a grid pattern, wherein parameters of the discrete elements of the UPA are controllable to achieve multiple disjoint beams covering different solid angles, and enabling the plurality of users of the plurality of mobile devices positioned in blind spots of a coverage map to communicate with the multi-antenna transmitter by employing the MS to generate sharp and effective beams having almost uniform gain in a desired angular coverage interval (ACI).

    Interactive beam alignment system with delayed feedback
    4.
    发明授权
    Interactive beam alignment system with delayed feedback 有权

    公开(公告)号：US11848851B2

    公开(公告)日：2023-12-19

    申请号：US17331112

    申请日：2021-05-26

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Shahram Shahsavari

    IPC: H04L43/12 ,  H04W16/28 ,  H04B7/0408 ,  H04B7/06 ,  H04W72/044

    CPC classification number: H04L43/12 ,  H04B7/0408 ,  H04B7/0617 ,  H04B7/0619 ,  H04B7/0695 ,  H04W16/28 ,  H04W72/046

    Abstract: Transmission systems include a configurable antenna, that transmits according to a configured beam, a hardware processor, and a memory that stores a computer program product. When the computer program product is executed by the hardware processor, it causes the hardware processor to send a first probing packet on the antenna using a first scanning beam, selected from a set of scanning beams, to determine feedback about the first probing packet, to send a second probing packet on the antenna using a second scanning beam, selected from the set of scanning beams based on the determined feedback about the first probing packet, to determine feedback about the second probing packet, to determine a data transmission beam based on the set of scanning beams and the received feedback about the first probing packet and the second probing packet, and to transmit data using the antenna, configured according to the determined transmission beam.

    MULTI-USER BEAM ALIGNMENT IN PRESENCE OF MULTI-PATH
    6.
    发明公开
    MULTI-USER BEAM ALIGNMENT IN PRESENCE OF MULTI-PATH 审中-公开

    公开(公告)号：US20230170971A1

    公开(公告)日：2023-06-01

    申请号：US17993341

    申请日：2022-11-23

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Nairman Torkzaban

    IPC: H04B7/06

    CPC classification number: H04B7/0695 ,  H04B7/0617 ,  H04B7/0619

    Abstract: A method for transmitting data is provided. The method includes sending a probing packet using a scanning beam selected from a set of probing beams. The method further includes receiving feedback about the probing packet. The method also includes determining a data transmission beam based on the set of probing beams and the received feedback. The method additionally includes transmitting data using a multi-element antenna that is configured according to the determined data transmission beam.

    Tracking RFID groups with spatio-temporal proximity
    7.
    发明授权
    Tracking RFID groups with spatio-temporal proximity 有权

    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

    IPC: G06K7/10 ,  G06N3/04

    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.

    CODEBOOK DESIGN FOR BEAMFORMING IN 5G AND BEYOND MMWAVE SYSTEMS
    8.
    发明申请
    CODEBOOK DESIGN FOR BEAMFORMING IN 5G AND BEYOND MMWAVE SYSTEMS 有权

    公开(公告)号：US20230027513A1

    公开(公告)日：2023-01-26

    申请号：US17856305

    申请日：2022-07-01

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Nariman Torkzaban

    IPC: H04B7/0456 ,  H04B7/06

    Abstract: A communications system for hybrid beamforming is provided. The communications system includes a base station encoding data into a plurality of streams, each transmitted through a radio frequency chain. The communication system further includes a beamforming codebook including a set of beamforming codewords. The communications system also includes a beamformer transmitting a given one of the plurality of streams through multiple antennas by adjusting a phase and a gain of symbols of the given one of the plurality of streams for each of the multiple antennas by using a corresponding beamforming coefficient of a given beamforming codeword chosen from the beamforming codebook. A beam and its corresponding beamforming codeword is designed such that the mean squared error between the beam pattern generated with the given beamforming codeword and a given beam pattern is minimized.

    BEAMFORMING AND OPPORTUNISTIC FAIR SCHEDULING FOR 5G WIRELESS COMMUNICATION SYSTEMS
    9.
    发明申请
    BEAMFORMING AND OPPORTUNISTIC FAIR SCHEDULING FOR 5G WIRELESS COMMUNICATION SYSTEMS 有权

    公开(公告)号：US20220346107A1

    公开(公告)日：2022-10-27

    申请号：US17714505

    申请日：2022-04-06

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour

    IPC: H04W72/12

    Abstract: A method for implementing opportunistic user scheduling under long-term and short-term resource fairness constraints is presented. The method includes enabling a base station to communicate with a plurality mobile devices handled by a plurality of users within a single-cell wireless communication network, deriving a feasible region of resource block (RB) fairness vectors by enabling an opportunistic scheduler to select active users from the plurality of users at each RB, implementing an optimal user scheduling strategy to maximize system utility by optimizing, via the opportunistic scheduler, transmit power and user mode selection, wherein the optimal user scheduling strategy includes a threshold-based strategy (TBS) phase and a compensation phase, and employing a short-term resource fair scheduling strategy satisfying user resource demands over a finite window-length.

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