公开(公告)号：US10530457B1

公开(公告)日：2020-01-07

申请号：US15131536

申请日：2016-04-18

Applicant: MARVELL INTERNATIONAL LTD.

Inventor： Hongyuan Zhang ,  Sudhir Srinivasa ,  Rohit U. Nabar

IPC: H04B7/08 ,  H04B7/06

Abstract: In a communication network, a first communication device obtains respective channel estimate matrices of respective communication channels between i) the first communication device and ii) respective second communication devices. The first communication device generates respective steering matrices for use in communicating with the respective second communication devices, including generating each steering matrix to project to a null-space of a space spanned by channel estimate matrices corresponding to others of the second communication devices. The first communication device utilizes the respective steering matrices to simultaneously transmit respective signals to the respective second communication devices.

公开(公告)号：US20190281658A1

公开(公告)日：2019-09-12

申请号：US16421136

申请日：2019-05-23

Applicant: Marvell International Ltd.

Inventor： Lei Wang ,  Liwen Chu ,  Jinjin Jiang ,  Hongyuan Zhang ,  Hui-Ling Lou

IPC: H04W84/02 ,  H04W28/02 ,  H04L1/16 ,  H04L1/18 ,  H04W72/12

Abstract: Aspects of the disclosure provide an apparatus for wireless communication. The apparatus includes a transceiver and a processing circuit. The transceiver is configured to transmit and receive wireless signals. The processing circuit is configured to detect an error of a previous scheduled transmission of data units from the apparatus to another apparatus. The other apparatus provides scheduled resources for transmission between the two apparatuses. Further, the processing circuit is configured to determine resources that are scheduled by the other apparatus for the apparatus to perform retransmission, and provide one or more of the data units in the previous scheduled transmission to the transceiver for retransmission using the scheduled resources.

公开(公告)号：US10411837B1

公开(公告)日：2019-09-10

申请号：US15601080

申请日：2017-05-22

Applicant: Marvell International Ltd.

Inventor： Hongyuan Zhang ,  Rui Cao

IPC: H04L1/06 ,  H04L5/00 ,  H04B7/04 ,  H04L1/00 ,  H04B7/0456

Abstract: Systems and methods described herein provide a system for transmitting data on an MIMO channel using a STBC. The system comprises a wireless transmitter. The wireless transmitter obtains plurality of data symbols to transmit, and performs data padding for the plurality of data symbols based on a non-STBC manner. The wireless transmitter further calculates a number of bits per data symbol after the data padding and pre-codes a data symbol from the plurality of data symbols based on available channel information when the number of data symbols is an odd number. The wireless transmitter generates an STBC based on the pre-coded data symbols, and transmits the generated STBC to the MIMO channel.

公开(公告)号：US10404336B1

公开(公告)日：2019-09-03

申请号：US16031693

申请日：2018-07-10

Applicant: Marvell International Ltd.

Inventor： Xiayu Zheng ,  Bo Yu ,  Hongyuan Zhang

IPC: H04B7/06 ,  H04B7/08 ,  H04L25/00 ,  H04B7/0456 ,  H04L25/02

Abstract: Embodiments described herein methods and systems for channel correlation based user detection in an uplink multiuser transmission of a multiple-input multiple-output (MIMIO) network. In some embodiments, the channel correlation based user detection may be used in 802.11 UL MUMIMO systems. For example, an access point may detect whether a client station responds to a trigger frame and then adjust a channel matrix accordingly to reflect whether the client station is responsive. The access point may then decode received data signals based on the adjusted channel matrix that reflects whether a client station has transmitted.

公开(公告)号：US10368391B1

公开(公告)日：2019-07-30

申请号：US16120393

申请日：2018-09-03

Applicant: Marvell International Ltd.

Inventor： Hongyuan Zhang ,  Rohit U. Nabar ,  Sudhir Srinivasa ,  Raja Banerjea ,  Yong Liu

IPC: H04W84/12 ,  H04J11/00 ,  H04L27/26

Abstract: A communication device generates a physical layer (PHY) data unit that includes a PHY preamble and one or more PHY midambles. The communication generates the PHY preamble of the PHY data unit to include i) a signal field having a subfield that indicates that the PHY data unit includes one or more PHY midambles, ii) a short training field (STF) for automatic gain control (AGC) training and synchronization at a receiver, and iii) one or more long training fields (LTFs) for determining a channel estimate at the receiver. The communication generates a data payload of the PHY data unit having i) a set of orthogonal frequency division multiplexing (OFDM) symbols, and ii) one or more PHY midambles. Each of the one or more PHY midambles includes one or more LTFs for determining an updated channel estimate. The communication device transmits the PHY data unit via a wireless communication channel.

公开(公告)号：US10320690B1

公开(公告)日：2019-06-11

申请号：US15353544

申请日：2016-11-16

Applicant: Marvell International Ltd.

Inventor： Liwen Chu ,  Sagar A. Tamhane ,  Hongyuan Zhang ,  Sudhir Srinivasa ,  Hui-Ling Lou

IPC: H04L12/841 ,  H04L12/26 ,  H04L29/08 ,  H04W84/12

Abstract: A first communication device generates a physical layer (PHY) protocol data unit having a beginning portion and an ending portion, where the beginning portion includes a PHY protocol header having a PHY protocol preamble, and the ending portion includes a reference signal. The PHY protocol data unit prompts a second communication device to record a first time corresponding to reception of the reference signal by the second communication device. The first communication device transmits the PHY protocol data unit, records a second time corresponding to transmission of the reference signal by the first communication device. The first communication device calculates a time of flight of the PHY protocol data unit using the second time, and/or transmits the second time to the second communication device, a third communication device, or both, to facilitate calculation of the time of flight of the PHY protocol data unit using the second time.

公开(公告)号：US10298370B1

公开(公告)日：2019-05-21

申请号：US15469362

申请日：2017-03-24

Applicant: Marvell International Ltd.

Inventor： Liwen Chu ,  Lei Wang ,  Jinjing Jiang ,  Hongyuan Zhang ,  Hui-Ling Lou

IPC: H04L5/00 ,  H04W72/04

Abstract: Systems and techniques relating to wireless networking systems and techniques, namely employing acknowledgement mechanisms utilized with trigger frames, include: transmitting, by a first wireless device, a first frame, wherein the first frame comprises a field indicating a response frame type associated with reception of the first frame; receiving, by the first wireless device from a second wireless device, an acknowledgement (ACK) frame associated with the field in the first frame via an established wireless communication channel, the ACK frame having a frame type corresponding to the response frame type indicated in the first frame; and receiving, by the first wireless device from the second wireless device, additional frames associated with the ACK frame.

公开(公告)号：US10257859B1

公开(公告)日：2019-04-09

申请号：US15598107

申请日：2017-05-17

Applicant: Marvell International Ltd.

Inventor： Liwen Chu ,  Lei Wang ,  Jinjing Jiang ,  Hongyuan Zhang ,  Hui-Ling Lou

IPC: H04W74/08 ,  H04B17/318

Abstract: Aspects of the disclosure provide an apparatus for wireless communication. The apparatus includes a transceiver and a processing circuit. The transceiver is configured to receive signals and transmit signals in one or more channels. The processing circuit is configured to detect that received signals in a channel carry a data unit, determine that the data unit belongs to an overlapping basic service set (OBSS) that overlaps with a basic service set (BSS) that the apparatus belongs to without information in a preamble of the data unit, select a clear channel assessment threshold that is dynamically adjusted for spatial re-use when the data unit is determined to belong to the OBSS, and compare a signal strength of the data unit with the selected clear channel assessment threshold to determine a busy/idle status of the channel.

公开(公告)号：US10218542B1

公开(公告)日：2019-02-26

申请号：US15783893

申请日：2017-10-13

Applicant: Marvell International Ltd.

Inventor： Parag Suresh Khairnar ,  Vijay Ahirwar ,  Sudhir Srinivasa ,  Hongyuan Zhang

IPC: H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04B7/06

Abstract: Systems, devices, and techniques relating to multi-symbol channel estimation are described. A described technique includes receiving a signal comprising first and second training symbols, and one or more data symbols; determining first and second channel estimates for subcarriers respectively based on the first and second training symbols; determining a dynamic timing advance estimate based on the first training symbol to adjust a sampling time for a remaining portion of the signal; determining one or more phase differences between the first and second training symbols for the subcarriers respectively based on angular versions of the first and second channel estimates; rotating the first channel estimates based on the dynamic timing advance estimate and the one or more phase differences; producing combined channel estimates based on the second channel estimates and the rotated first channel estimates; and processing the one or more data symbols based on the combined channel estimates.

公开(公告)号：US10194268B1

公开(公告)日：2019-01-29

申请号：US15041954

申请日：2016-02-11

Applicant: Marvell International Ltd.

Inventor： Liwen Chu ,  Sagar A. Tamhane ,  Hongyuan Zhang ,  Hui-Ling Lou ,  Kwok Shum Au

IPC: H04W4/02 ,  H04L29/08 ,  H04W40/24

Abstract: A first communication device determines scheduling information for a plurality of range measurement signal exchange sessions between the first communication device and one or more second communication devices, wherein the plurality of range measurement signal exchange sessions involve using at least one of i) different channel bandwidths, and ii) different physical layer data unit (PPDU) formats for the plurality of range measurement signal exchange sessions. The first communication device transmits a single packet that includes scheduling information so that a third communication device can use the scheduling information to observe one or more of the range measurement signal exchange sessions in the plurality of range measurement signal exchange sessions between the first communication device and one or more second communication devices, to determine range measurements.