公开(公告)号：US20210194621A1

公开(公告)日：2021-06-24

申请号：US17194847

申请日：2021-03-08

Applicant: NXP USA, INC.

Inventor： Yakun Sun ,  Hongyuan Zhang ,  Sudhir Srinivasa ,  Rui Cao

IPC: H04L1/00 ,  H04L5/00 ,  H04L27/26

Abstract: Systems, apparatuses and methods described herein provide a method for padding a signal extension of orthogonal frequency-division multiplexing (OFDM) symbols. A transceiver may obtain a plurality of data symbols for transmission, and determine that a number of information bits for a last symbol of the plurality of data symbols is not an integer value. A special padding rule may be applied to add padding bits to the last symbol. A number of coded bits for the last symbol may be determined when the number of information bits for the last symbol has changed, and the plurality of data symbols for data transmission may be encoded based on the determined number of coded bits for the last symbol.

公开(公告)号：US20210160959A1

公开(公告)日：2021-05-27

申请号：US17102656

申请日：2020-11-24

Applicant: NXP USA, Inc.

Inventor： Rui Cao ,  Hongyuan Zhang ,  Sudhir Srinivasa

IPC: H04W80/02 ,  H04W72/04 ,  H04L5/00 ,  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.

公开(公告)号：US10993197B2

公开(公告)日：2021-04-27

申请号：US16424532

申请日：2019-05-29

Applicant: NXP USA, Inc.

Inventor： B Hari Ram ,  Sri Varsha Rottela ,  Vijay Ahirwar ,  Sudhir Srinivasa ,  Nilesh N Khude

IPC: H04W56/00 ,  H04B7/0413 ,  H04B7/06 ,  H04W16/28 ,  H04W76/11 ,  H04B7/0417 ,  H04W84/04 ,  H04W84/12

Abstract: A method for communication in a WLAN includes associating a client station (STA) with a basic service set (BSS) of a first access point (AP), having first antennas, in a wireless local area network (WLAN). A second AP, having second antennas, in the WLAN is synchronized with the first AP. Distributed beamforming parameters are computed over a group of the first antennas and the second antennas. Data for transmission to the STA are distributed to both the first AP and the second AP. The distributed data are distributed to the STA from the first AP via the first antennas in the group and the second AP via the second antennas in the group in synchronization in accordance with the distributed beamforming parameters.

公开(公告)号：US20210075575A1

公开(公告)日：2021-03-11

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: H04L5/00 ,  H04W64/00 ,  H04L1/00 ,  H04L27/26 ,  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.

公开(公告)号：US20200382998A1

公开(公告)日：2020-12-03

申请号：US16882366

申请日：2020-05-22

Applicant: NXP USA, Inc.

Inventor： Rui Cao ,  Hongyuan Zhang ,  Liwen Chu ,  Sudhir Srinivasa

IPC: H04W28/06 ,  H04L27/18 ,  H04L1/00

Abstract: Techniques for signaling new versions of a communication protocol differentiated from legacy versions of the communication protocol that are interoperable with stations implementing legacy versions of the communication protocol, that are compatible with future new versions of the communication protocol, and that do not overly complicate the receiver state machine have been disclosed.

公开(公告)号：US10673476B2

公开(公告)日：2020-06-02

申请号：US16381713

申请日：2019-04-11

Applicant: NXP USA, Inc.

Inventor： Sayak Roy ,  Salil Kashyap ,  Ankit Sethi ,  Sudhir Srinivasa

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159 ,  H04B1/12

Abstract: This disclosure describes a receiver having equalization with noise de-whitening mitigation for wireless communication. An input port receives, via an antenna, a signal communicated over a wireless communication link, the signal comprising a noise component. Control circuitry performs zero forcing equalization of the received signal to generate a zero forcing equalization result signal. The zero forcing equalization causes de-whitening of the noise component by increasing a correlation among elements of the noise component. The control circuitry mitigates the de-whitening of the noise component by: determining a noise variance value based on channel properties of the wireless communication link, and modifying the zero forcing equalization result signal based on the noise variance value. The modified zero forcing equalization result signal is communicated, via an output port, to log-likelihood ratio (LLR) generation circuitry for LLR computation.

公开(公告)号：US12250043B2

公开(公告)日：2025-03-11

申请号：US18328280

申请日：2023-06-02

Applicant: NXP USA, Inc.

Inventor： Young Hoon Kwon ,  Liwen Chu ,  Sudhir Srinivasa ,  Hongyuan Zhang ,  Huiling Lou

IPC: H04B7/06 ,  H04B7/0413 ,  H04W72/04 ,  H04W88/02 ,  H04W88/06

Abstract: Various embodiments relate to a system and method for joint sounding by a client with a master access point (AP) and a slave (AP), including: receiving a message from the master AP; applying network allocation vector (NAV) rules to update a NAV values, wherein the received message is treated as an intra-basic service set (BSS) message when the transmit address (TA) of the received message has a prespecified value; receiving a first trigger frame; and transmitting a first channel state information (CSI) to the master AP when the channel is idle based upon the updated NAV value in response to the trigger frame.

公开(公告)号：US12207241B2

公开(公告)日：2025-01-21

申请号：US17655979

申请日：2022-03-22

Applicant: NXP USA, Inc.

Inventor： Hongyuan Zhang ,  Sudhir Srinivasa ,  Ken Kinwah Ho ,  Timothy J. Donovan ,  Foo Keong Tang ,  Liwen Chu

IPC: H04W72/04 ,  H04W72/0446 ,  H04W72/23 ,  H04W84/12 ,  H04W88/08

Abstract: One example discloses a wireless Access Point (AP) device, within a wireless local area network (WLAN), including: a controller configured to generate a reserve slot time trigger frame to a selected set of wireless devices; wherein the controller is configured to be coupled to an antenna; wherein the antenna is configured to transmit the reserve slot time trigger frame over a physical media to the selected set of user station devices (STAs) and exchange traffic with the selected set of STAs over the physical media; wherein the reserve slot time trigger frame is configured to reserve a slot time on the physical media; and wherein the controller is configured to transmit a burst of downlink (DL) traffic from the AP device during the slot time.

公开(公告)号：US12170984B2

公开(公告)日：2024-12-17

申请号：US17655987

申请日：2022-03-22

Applicant: NXP USA, Inc.

Inventor： Hongyuan Zhang ,  Sudhir Srinivasa ,  Ken Kinwah Ho ,  Timothy J. Donovan ,  Foo Keong Tang ,  Liwen Chu

IPC: H04W72/04 ,  H04W72/0446 ,  H04W84/12

Abstract: One example discloses a wireless Access Point (AP) device, configured to operate within a wireless local area network (WLAN), including: a controller configured to generate a reserve slot time trigger frame and a request to transmit trigger frame; wherein the controller is configured to be coupled to an antenna; wherein the antenna is configured to transmit the trigger frames over a physical media to a set of user station devices (STAs) and exchange traffic with the set of STAs over the physical media; wherein the reserve slot time trigger frame is configured to reserve a slot time on the physical media; and wherein the request to transmit trigger frame is configured to command a first STA from the set of STAs to transmit data buffered in the first STA to the AP device.

公开(公告)号：US12160329B2

公开(公告)日：2024-12-03

申请号：US17369931

申请日：2021-07-07

Applicant: NXP USA, Inc.

Inventor： Ankit Sethi ,  Sayak Roy ,  Sudhir Srinivasa

IPC: H04L25/02 ,  H04B7/0452 ,  H04B7/0456 ,  H04W4/06 ,  H04L5/00

Abstract: Embodiments of a method and an apparatus for wireless communications are disclosed. In an embodiment, a method for wireless communications involves generating a packet for transmission to a user, where generating the packet includes: encoding user signaling parameters and setting a station-identification (STA-ID) of the user to a value, where the signaling parameters include a number of space time streams (nSTS) spatial streams, establishing a dummy user without changing the user signaling parameters, setting a STA-ID of the dummy user to a value that is different from the STA-ID value of the user, indicating the nSTS spatial streams that are allocated to the dummy user and that are to include Long Training Field (LTF) symbols, and transmitting the packet to the user with the LTF symbols.