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    Structure for low-power-low-rate data transmission in a wireless network
    13.
    发明授权
    Structure for low-power-low-rate data transmission in a wireless network 有权

    公开(公告)号：US11190396B1

    公开(公告)日：2021-11-30

    申请号：US16141103

    申请日：2018-09-25

    Applicant: NXP USA, Inc.

    Inventor： Rui Cao ,  Hongyuan Zhang ,  Hui-Ling Lou

    IPC: H04L29/06 ,  H04W4/00 ,  H04L12/24 ,  H04L27/22 ,  H04L27/20 ,  H04W84/12

    Abstract: Embodiments described herein provides a system for detecting data received in a low power low rate (LPLR) data frame format. A mixed mode LPLR frame may be falsely detected by an 802.11n device as an 802.11n packet. When the false detection occurs, the PHY-CAA indication may be erroneously set, which leads to a communication error. To prevent the false detection by an 802.11n device, embodiments described herein describes adding a redundant “dummy” 4 μs orthogonal frequency division multiplexing (OFDM) symbol with binary phase-shift keying (BPSK) modulation before the LPLR preamble in the LPLR frame, to differentiate from data symbols in an 802.11n packet.

    OFMDA TONE PLAN FOR 80MHZ
    14.
    发明申请
    OFMDA TONE PLAN FOR 80MHZ 有权

    公开(公告)号：US20210320763A1

    公开(公告)日：2021-10-14

    申请号：US17211969

    申请日：2021-03-25

    Applicant: NXP USA, Inc.

    Inventor： Rui Cao ,  Sudhir Srinivasa ,  Hongyuan Zhang

    IPC: H04L5/00 ,  H04W88/08

    Abstract: Various embodiments relate to a method for transmitting a Wi-Fi signal using a channel of 80 MHz or wider, wherein each 80 MHz segment has a tone plan, including: determining that a physical 20 MHz sub-channel overlaps the 80 MHz segment or OFDMA transmission is used for the 80 MHz segment; selecting an alternative 80 MHz tone plan; and transmitting data on the 80 MHz segment using the selected alternative 80 MHz tone plan.

    METHOD AND APPARATUS FOR COMMUNICATIONS
    15.
    发明申请
    METHOD AND APPARATUS FOR COMMUNICATIONS 有权

    公开(公告)号：US20210266386A1

    公开(公告)日：2021-08-26

    申请号：US17182075

    申请日：2021-02-22

    Applicant: NXP USA, Inc.

    Inventor： Rui Cao ,  Liwen Chu ,  Sudhir Srinivasa ,  Hongyuan Zhang ,  Yan Zhang ,  Xiayu Zheng

    IPC: H04L29/06 ,  H04L27/26

    Abstract: Embodiments of a method and an apparatus for wireless communications are disclosed. In an embodiment, a method for wireless communications involves encoding bits in a first preamble portion of a packet that are defined on a per-channel basis and that are repeated across multiple frequency blocks of a bandwidth, encoding bits in a second preamble portion of the packet that are defined on the per-channel basis and that are repeated within at least one frequency block of the bandwidth, encoding bits in a third preamble portion of the packet that are defined on a two-channel basis and that are repeated within at least one frequency block of the bandwidth, padding the third preamble portion of the packet to have a same length for each of the frequency blocks, and transmitting the packet.

    Systems and methods for implementing an OFDMA LTF design for wireless network communication
    16.
    发明授权
    Systems and methods for implementing an OFDMA LTF design for wireless network communication 有权

    公开(公告)号：US10826735B2

    公开(公告)日：2020-11-03

    申请号：US16291649

    申请日：2019-03-04

    Applicant: NXP USA, Inc.

    Inventor： Yakun Sun ,  Hongyuan Zhang ,  Rui Cao

    IPC: H04L27/26

    Abstract: Systems, methods, and apparatuses are disclosed herein for aligning HE-LTFs corresponding to a plurality of users by determining a respective number of spatial streams corresponding to each user, determining a highest respective number of spatial streams of the spatial streams, and setting an alignment number of HE-LTF symbols to be equal to or larger than the highest respective number of spatial streams. For each respective user, a respective matrix of HE-LTF symbols corresponding to the respective number of spatial streams of the respective user is selected, and it is determined whether the respective matrix of HE-LTF symbols has fewer symbols than the alignment number. In response to determining that the respective matrix of HE-LTF symbols has fewer symbols than the alignment number, padding symbols may be added to the respective matrix to yield a number of HE-LTF symbols in the respective matrix that corresponds to the alignment number.

    Multi-antenna coherent combining for carrier sensing and symbol timing
    17.
    发明授权
    Multi-antenna coherent combining for carrier sensing and symbol timing 有权

    公开(公告)号：US10728865B1

    公开(公告)日：2020-07-28

    申请号：US15371109

    申请日：2016-12-06

    Applicant: NXP USA, INC.

    Inventor： Rui Cao ,  Xiayu Zheng ,  Hongyuan Zhang

    IPC: H04J3/06 ,  H04W56/00 ,  H04B7/08 ,  H04L5/00 ,  H04W84/12

    Abstract: The present disclosure includes systems and techniques relating to multi-antenna coherent combining (MACC) for carrier sensing (CS) and symbol timing (ST) in a wireless communication system. In some implementations, a device includes a receiver and processor electronics. The receiver is configured to receive two or more signals from two or more antennas, each of the two or more signals including a known, periodic reference signal that has gone through a respective wireless channel via one of the two or more antennas. The processor electronics are configured to obtain estimated phases of the two or more signals from the two or more antennas; obtain a combined signal by combining the two or more signals with coherent estimated phases of the two or more signals; and perform carrier sensing and symbol timing of the two or more signals based on the combined signal.

    Determining number of midambles in a packet
    18.
    发明授权
    Determining number of midambles in a packet 有权

    公开(公告)号：US10715365B2

    公开(公告)日：2020-07-14

    申请号：US16135852

    申请日：2018-09-19

    Applicant: NXP USA, Inc.

    Inventor： Yan Zhang ,  Hongyuan Zhang ,  Rui Cao

    IPC: H04W24/04 ,  H04W72/02 ,  H04W80/02 ,  H04L27/26 ,  H04L5/00 ,  H04W24/08

    Abstract: A communication device receives a physical layer (PHY) protocol data unit (PPDU). The PPDU includes i) a PHY preamble and ii) PHY data portion that includes one or more PHY midambles, and the PHY preamble includes i) an indication of a length of the PPDU, and ii) an indication of a periodicity of PHY midambles in the PHY data portion. The communication device calculates a number of PHY midambles in the PPDU using i) the indication of the length of the PPDU, and ii) the indication of the periodicity of PHY midambles. The communication device calculates a reception time for the PPDU using the calculated number of PHY midambles, and processes the PPDU using the calculated reception time.

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