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    Codebook construction
    23.
    发明授权
    Codebook construction 有权
    Codebook建设

    公开(公告)号：US09020061B2

    公开(公告)日：2015-04-28

    申请号：US14198653

    申请日：2014-03-06

    Applicant: NEC Laboratories America, Inc.

    Inventor： Narayan Prasad ,  Guosen Yue ,  Mohammad Khojastepour ,  Sampath Rangarajan

    IPC: H04B7/02 ,  H04L1/02 ,  H04L25/03 ,  H04B7/04 ,  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 a 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 precoding matrix W satisfies W=W(1)W(2), where first matrix W(1) is chosen from first codebook (1), and second matrix W(2) is chosen from a second codebook. 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。 该方法包括具有包括多个预编码矩阵的码本，与多个预编码矩阵之一进行预编码数据，并向用户设备发送预编码数据，其中每个预编码矩阵W满足W = W（1）W（ 2），其中从第一码本（1）中选择第一矩阵W（1），并且从第二码本中选择第二矩阵W（2）。 还公开了其他装置，系统和方法。

    Optimizing scanning beam penetration
    24.
    发明授权
    Optimizing scanning beam penetration 有权

    公开(公告)号：US12267140B2

    公开(公告)日：2025-04-01

    申请号：US18311353

    申请日：2023-05-03

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Nariman Torkzaban

    IPC: H04B7/06 ,  H04B7/0426 ,  H04B7/0495

    Abstract: Beamforming methods and systems include determining a tradeoff curve between scanning beamwidth and transmission beamwidth based on a channel distribution for a base station. A set of scanning beams is selected based on the tradeoff curve. Devices around the base station are scanned for using the set of scanning beams. A set of transmission beams is selected for communications with the devices based on information received during the scanning. The set of transmission beams are used for transmission with a beamforming transmitter.

    SEMANTIC MULTI-RESOLUTION COMMUNICATIONS
    25.
    发明申请
    SEMANTIC MULTI-RESOLUTION COMMUNICATIONS 有权

    公开(公告)号：US20250036923A1

    公开(公告)日：2025-01-30

    申请号：US18782792

    申请日：2024-07-24

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Matin Mortaheb ,  Srimat Chakradhar

    IPC: G06N3/0455 ,  G06N3/08

    Abstract: Methods and systems for semantic multi-resolution transmission include encoding data using an encoder model that includes an initial encoding and heads. A first head of outputs a base encoding and a remainder of the heads output respective enhancement encodings. The base encoding and at least one of the enhancement encodings are decoded using a decoder model to retrieve the semantic meaning of the data and to generate a reconstructed output. A task is performed responsive to the reconstructed output and retrieved semantic meaning.

    Multi-user beam alignment in presence of multi-path
    26.
    发明授权
    Multi-user beam alignment in presence of multi-path 有权

    公开(公告)号：US12199727B2

    公开(公告)日：2025-01-14

    申请号：US17993341

    申请日：2022-11-23

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Nariman Torkzaban

    IPC: H04B7/06

    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.

    CODEBOOK DESIGN FOR COMPOSITE BEAMFORMING IN NEXT-GENERATION MMWAVE SYSTEMS
    27.
    发明申请
    CODEBOOK DESIGN FOR COMPOSITE BEAMFORMING IN NEXT-GENERATION MMWAVE SYSTEMS 有权

    公开(公告)号：US20230092742A1

    公开(公告)日：2023-03-23

    申请号：US17948624

    申请日：2022-09-20

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Nariman Torkzaban

    IPC: H04B7/06 ,  H01Q3/26

    Abstract: A method of communicating between a transmitter and a receiver in a wireless communication system is provided. The method includes selecting a beamformer from a beamforming codebook. The method further includes transmitting a signal from antenna elements using the selected beamformer by adjusting a gain and a phase of the signal. The antenna elements correspond to an absolute value and an angle of a respective complex beamforming coefficient from the selected beamformer. The beamformer is a composite beam including a plurality of disjoint beam lobes, and each of the plurality of disjoint beam lobes covers a desired angular interval.

    SHAPING mmWAVE WIRELESS CHANNEL VIA MULTI-BEAM DESIGN USING RECONFIGURABLE INTELLIGENT SURFACES
    28.
    发明申请
    SHAPING mmWAVE WIRELESS CHANNEL VIA MULTI-BEAM DESIGN USING RECONFIGURABLE INTELLIGENT SURFACES 有权

    公开(公告)号：US20230043800A1

    公开(公告)日：2023-02-09

    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

    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).

    Efficient decoding of RFID tags based on relevant RN16 selection
    29.
    发明授权
    Efficient decoding of RFID tags based on relevant RN16 selection 有权

    公开(公告)号：US11386279B2

    公开(公告)日：2022-07-12

    申请号：US17171172

    申请日：2021-02-09

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Carlos Bocanegra

    IPC: H04Q5/22 ,  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.

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