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    BI-DIMENSIONAL STEERING MATRIX ALIGNMENT AT BEAMFORMER
    1.
    发明申请
    BI-DIMENSIONAL STEERING MATRIX ALIGNMENT AT BEAMFORMER 有权

    公开(公告)号：US20250055518A1

    公开(公告)日：2025-02-13

    申请号：US18475279

    申请日：2023-09-27

    Applicant: NXP USA, INC.

    Inventor： Sayak Roy ,  Ankit Sethi ,  Sudhir Srinivasa

    IPC: H04B7/0456 ,  H04B7/06 ,  H04L25/02

    Abstract: A transmitter, including: a plurality of antennas; and a controller configured to: receive a first steering matrix for a first feedback tone; receive a second steering matrix for a second feedback tone; estimate an ideal second steering matrix including: estimating a set of random phasors applied to the columns of the second feedback matrix; and estimating a set of row-dependent delays applied to the rows of the second feedback matrix; estimate a vector of angles based upon the estimated set of random phasors; and calculate a steering matrix for a tone between the first feedback tone and the second feedback tone by interpolating between the first steering matrix and the ideal second steering matrix based upon the estimated vector of angles.

    METHOD AND APPARATUS FOR BANDWIDTH DETECTION IN WIRELESS NETWORKS
    2.
    发明申请
    METHOD AND APPARATUS FOR BANDWIDTH DETECTION IN WIRELESS NETWORKS 有权

    公开(公告)号：US20240388492A1

    公开(公告)日：2024-11-21

    申请号：US18352699

    申请日：2023-07-14

    Applicant: NXP USA, Inc.

    Inventor： Sayak Roy ,  Ankit Sethi ,  Rihua Wei ,  Hanchao Yang ,  Sudhir Srinivasa ,  Tsunglun Yu

    IPC: H04L27/26

    Abstract: A receiver receives a wireless signal comprising a plurality of fields including a legacy short training field (L-STF), legacy long training field (L-LTF), and legacy signal (L-SIG) field transmitted to a plurality of antenna of the receiver. For each sub-band in a receiver bandwidth and when samples of the L-STF is received, a first angle based autocorrelation is performed to determine a group of sub-bands which maximize a magnitude based on the first autocorrelations for one or more sub-bands. For each sub-band in the receiver bandwidth and when samples of the L-LTF is received, a second angle based autocorrelation is then performed to refine the crude bandwidth pattern estimate. One or more signal fields and one or more data fields of the received signal are decoded based on the refined bandwidth pattern estimate.

    Physical layer parsing for multiple input multiple output (MIMO) punctured transmission and apparatus
    5.
    发明授权
    Physical layer parsing for multiple input multiple output (MIMO) punctured transmission and apparatus 有权

    公开(公告)号：US11611417B2

    公开(公告)日：2023-03-21

    申请号：US17102656

    申请日：2020-11-24

    Applicant: NXP USA, Inc.

    Inventor： Rui Cao ,  Hongyuan Zhang ,  Sudhir Srinivasa

    IPC: H04L5/00 ,  H04W72/04 ,  H04W72/0453 ,  H04W80/02 ,  H04B7/0413

    Abstract: A data unit comprising bits to transmit over one or more frequency segments in a frequency range is obtained. An effective bandwidth in each frequency segment of the frequency range is determined, where the effective bandwidth excludes bandwidth of one or more punctured subchannels in a respective frequency segment. Bits are encoded based on the effective bandwidth of each frequency segment followed by parsing the encoded bits to one or more streams and parsing the encoded bits of a stream to the one or more frequency segments. The parsing of the encoded bits of the stream comprises allocating a first number of consecutive encoded bits to a first frequency segment and allocating a second number of consecutive encoded bits to a second frequency segment, wherein the first number and the second number are based on the effective bandwidth of the first frequency segment and the second frequency segment. The encoded bits are modulated and mapped to subcarriers for transmission.

    Multi-user null data packet (NDP) ranging
    6.
    发明授权
    Multi-user null data packet (NDP) ranging 有权

    公开(公告)号：US11558847B2

    公开(公告)日：2023-01-17

    申请号：US17100252

    申请日：2020-11-20

    Applicant: NXP USA, INC.

    Inventor： Liwen Chu ,  Hongyuan Zhang ,  Christian R. Berger ,  Niranjan Grandhe ,  Sudhir Srinivasa ,  Hui-ling Lou

    IPC: H04W64/00 ,  H04L5/00 ,  H04L1/00 ,  H04W8/00 ,  H04W24/10

    Abstract: A first communication device prompts a plurality of second communication devices to transmit, during a contiguous time period reserved for a range measurement exchange, respective first null data packets (NDPs) at respective times. The first communication device receives first NDPs from at least some of the second communication devices during the contiguous time period, and transmits one or more second NDPs to the plurality of second communication devices. The first communication device uses reception of the first NDPs and transmission of the one or more second NDPs to determine respective ranges between the first communication device and respective second communication devices.

    SOUNDING TO MIXED BANDWIDTH STATIONS
    8.
    发明申请
    SOUNDING TO MIXED BANDWIDTH STATIONS 有权

    公开(公告)号：US20220116179A1

    公开(公告)日：2022-04-14

    申请号：US17495367

    申请日：2021-10-06

    Applicant: NXP USA, Inc.

    Inventor： Rui CAO ,  Sudhir Srinivasa ,  Xiayu Zheng ,  Hongyuan Zhang

    IPC: H04L5/00 ,  H04B7/06

    Abstract: Various embodiments relate to a method of sounding a plurality of stations (STAs) with mixed operating bandwidths using a null data packet (NDP), wherein the bandwidth of the NDP is wider than the bandwidth of one STA, including: grouping STAs of mixed operating bandwidth in one sounding sequence by a beamformer; transmitting a null data packet announcement (NDPA) to the STAs, wherein the NDPA indicates the requested partial bandwidth channel feedback for each STA by the beamformer; transmitting the wide-bandwidth NDP to the STAs by the beamformer; transmitting beamforming report poll (BFRP) frame to the STAs to trigger uplink transmission of channel feedback reports by the beamformer; and receiving by the beamformer a partial bandwidth channel feedback within the STA's operating bandwidth from the STAs; receiving and parsing channel feedback reports from the STAs used for following steered OFDMA transmissions by the beamformer.

    METHOD AND SYSTEM FOR ENABLING DISTRIBUTED MULTIPLE-INPUT-MULTIPLE-OUTPUT COMMUNICATION IN WIRELESS NETWORKS
    9.
    发明申请
    METHOD AND SYSTEM FOR ENABLING DISTRIBUTED MULTIPLE-INPUT-MULTIPLE-OUTPUT COMMUNICATION IN WIRELESS NETWORKS 有权

    公开(公告)号：US20220021416A1

    公开(公告)日：2022-01-20

    申请号：US16929075

    申请日：2020-07-14

    Applicant: NXP USA, Inc.

    Inventor： Hari Ram Balakrishnan ,  Sudhir Srinivasa

    IPC: H04B7/024 ,  H04W88/08 ,  H04W48/20 ,  H04W48/16 ,  H04W84/12 ,  H04W24/02 ,  H04W52/24

    Abstract: A first access point (AP) for enabling distributed multiple-input-multiple-output (DMIMO) communication in a wireless network is disclosed. The first AP is configured to select a wireless client from a plurality of wireless clients or a second AP from a plurality of APs such that a difference between a path loss value associated with the first AP and the wireless client, and a path loss value associated with the second AP and the wireless client is greater than or equal to a threshold value. The wireless client is selected when the first and second APs are available for DMIMO communication, and the second AP is selected when the wireless client and the first AP are available for DMIMO communication. The first AP is further configured to associate the first and second APs with the wireless client for enabling DMIMO communication between the first and second APs and the wireless client.

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