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    Beamforming systems and methods
    21.
    发明授权
    Beamforming systems and methods 有权
    波束成形系统和方法

    公开(公告)号：US09300371B1

    公开(公告)日：2016-03-29

    申请号：US14164734

    申请日：2014-01-27

    Applicant: Marvell International LTD.

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

    IPC: H04B7/04 ,  H04L27/26 ,  H04L25/03

    CPC classification number: H04B7/0408 ,  H04B7/0413 ,  H04B7/0417 ,  H04B7/0456 ,  H04B7/0617 ,  H04K1/10 ,  H04K3/224 ,  H04K2203/32 ,  H04L1/0003 ,  H04L1/0015 ,  H04L1/0026 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0091 ,  H04L25/03343 ,  H04L27/0008 ,  H04L27/2601 ,  H04L27/2626 ,  H04L27/2636 ,  H04L27/2646

    Abstract: A first network device including a receiver, a steering module, and a transmitter. The receiver is configured to receive a first signal from a second network device. The first signal is transmitted from the second network device using a first modulation system. The steering module is configured to generate a steering matrix based on the first signal. The transmitter is configured to transmit a second signal using the steering matrix to the second network device. The second signal is transmitted using a second modulation system. The first and second modulation schemes are selected from a group consisting of (i) a plurality of single carrier based modulation schemes and (ii) a plurality of orthogonal frequency division multiplexing based modulation schemes. The second modulation system is different from the first modulation system.

    Abstract translation: 包括接收机，转向模块和发射机的第一网络设备。 接收器被配置为从第二网络设备接收第一信号。 使用第一调制系统从第二网络设备发送第一信号。 转向模块被配置为基于第一信号生成导向矩阵。 发射器被配置为使用导向矩阵向第二网络设备发送第二信号。 使用第二调制系统发送第二信号。 第一和第二调制方案从由（i）多个基于单载波的调制方案和（ii）多个基于正交频分复用的调制方案组成的组中选择。 第二调制系统与第一调制系统不同。

    Compressed beamforming feedback
    22.
    发明授权
    Compressed beamforming feedback 有权

    公开(公告)号：US10601486B1

    公开(公告)日：2020-03-24

    申请号：US16260881

    申请日：2019-01-29

    Applicant: Marvell International Ltd.

    Inventor： Sayak Roy ,  Ankit Sethi ,  Sudhir Srinivasa

    IPC: H04B7/06 ,  H04B7/0417

    Abstract: A method for providing a compressed beamforming feedback of a communication channel includes receiving, at a first communication device, a plurality of training signals from a second communication device via the communication channel, determining a channel matrix corresponding to the communication channel based on the plurality of training signals, precomputing a sequence of column sorting orders and/or a sequence of scaling factors based on a first intermediate matrix derived from the channel matrix in advance of performing a modified QR decomposition, performing the modified QR decomposition to derive the compressed beamforming feedback based on the first intermediate matrix with the precomputed column sorting orders and/or scaling factors as an input, and transmitting the compressed beamforming feedback from the first communication device to the second communication device to enable the second communication device to steer at least one subsequent transmission to the first communication device based on the compressed beamforming feedback.

    Determining common phase error
    24.
    发明授权
    Determining common phase error 有权

    公开(公告)号：US10277440B1

    公开(公告)日：2019-04-30

    申请号：US15689882

    申请日：2017-08-29

    Applicant: Marvell International Ltd.

    Inventor： Ankit Sethi ,  Sudhir Srinivasa ,  Sayak Roy

    IPC: H04L27/00 ,  H04L27/20 ,  H04L27/26

    Abstract: Systems and techniques for determining common phase error (e.g., phase error common to subcarriers) in an OFDM symbol are described. A respective common phase error for each data symbol of a plurality of data symbols in a data packet are combined to form a refined common phase error. The refined common phase error is based on pilot tones from a plurality of data symbols in a data packet, rather than being limited to pilot tones of a single data packet. Accordingly, refined common phase errors are determined that provide processing gain to accurately estimate common phase error in an OFDM symbol when other systems fail, including when the number of pilot tones in OFDM symbols is low or the data packets are received with high noise. Further improvement is made when the data packet is long due to the coherency of oscillator phase noise and amplifier gain drift.

    Hybrid automatic repeat request for wireless local area network
    26.
    发明授权
    Hybrid automatic repeat request for wireless local area network 有权

    公开(公告)号：US09876614B1

    公开(公告)日：2018-01-23

    申请号：US14600766

    申请日：2015-01-20

    Applicant: Marvell International Ltd.

    Inventor： Yakun Sun ,  Liwen Chu ,  Hongyuan Zhang ,  Sudhir Srinivasa ,  Hui-Ling Lou

    IPC: H04L1/18 ,  H04L1/16 ,  H04L27/26 ,  H04L5/00 ,  H04W84/12 ,  H04W84/02

    CPC classification number: H04L1/1812 ,  H04L1/1664 ,  H04L1/1867 ,  H04L5/0055 ,  H04L27/2602 ,  H04L27/2607 ,  H04W84/025 ,  H04W84/12

    Abstract: A method for transmission of media access control (MAC) protocol data units (MPDUs) over a wireless local area network (WLAN) communication channel is described. A first physical layer (PHY) data unit is generated at a first communication device. The first PHY data unit has i) a data field that includes a first MPDU to be transmitted to a second communication device, and ii) a PHY signal field that includes a transmission version field set to indicate an initial transmission of the first MPDU. The first PHY data unit is transmitted over the WLAN communication channel to the second communication device. It is determined, at the first communication device, whether a first acknowledgment to the first MPDU has been received from the second communication device. In response to determining that the first acknowledgment has not been received, a second PHY data unit is generated at the first communication device. The second PHY data unit has i) a data field that includes the first MPDU, and ii) a PHY signal field that includes a transmission version field set to indicate a retransmission of the first MPDU. The second PHY data unit is transmitted over the WLAN communication channel to the second communication device.

    Method and apparatus for determining a location of a network device in a wireless network
    29.
    发明授权
    Method and apparatus for determining a location of a network device in a wireless network 有权
    用于确定无线网络中的网络设备的位置的方法和装置

    公开(公告)号：US09474041B1

    公开(公告)日：2016-10-18

    申请号：US14969503

    申请日：2015-12-15

    Applicant: Marvell International Ltd.

    Inventor： Hongyuan Zhang ,  Liwen Chu ,  Sudhir Srinivasa

    IPC: H04W24/00 ,  H04W64/00 ,  H04W4/02

    CPC classification number: H04W64/00 ,  G01S5/10 ,  H04W4/02

    Abstract: A first access point including a receiver, a transmitter, a feedback module, and a location determining module. The receiver receives a first frame from a client station. The transmitter transmits a second frame to the client station. The first and second frames are also received by second and third devices, which are located at predetermined locations. The feedback module receives a first feedback from the client station including times of departure and arrival of the first and second frames at the client station, and a second feedback from the second and third devices including times of arrival of the first and second frames at the second device and the third device. The location determining module determines a location of the client station based on the times of arrival and departure of the first and second frames at the first access point, the first and second feedbacks, and the predetermined locations.

    Abstract translation: 第一接入点，包括接收机，发射机，反馈模块和位置确定模块。 接收机从客户端接收第一帧。 发射机向客户端发送第二帧。 第一和第二帧也由位于预定位置的第二和第三设备接收。 反馈模块从客户站接收包括在客户站处的第一和第二帧的出发和到达时间的第一反馈，以及来自第二和第三设备的第二反馈包括第一和第二帧到达的时间 第二设备和第三设备。 位置确定模块基于第一和第二帧在第一接入点，第一和第二反馈和预定位置的到达和离开时间来确定客户端站的位置。

    PHY frame formats in a system with more than four space-time streams
    30.
    发明授权
    PHY frame formats in a system with more than four space-time streams 有权
    具有超过四个时空流的系统中的PHY帧格式

    公开(公告)号：US09247579B1

    公开(公告)日：2016-01-26

    申请号：US13888206

    申请日：2013-05-06

    Applicant: MARVELL INTERNATIONAL LTD.

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

    IPC: H04W72/04 ,  H04W84/12 ,  H04W72/12 ,  H04W28/02

    CPC classification number: H04L27/2602 ,  H04B7/0684 ,  H04L1/0625 ,  H04L1/0675 ,  H04L25/0204 ,  H04L25/0224 ,  H04W28/0263 ,  H04W72/04 ,  H04W72/1263 ,  H04W84/12

    Abstract: In generating a data unit for transmission via a communication channel, a preamble of the data unit is generated, including i) generating a set of training fields, and ii) mapping each training field in the set of training fields to a plurality of space-time streams. When the set of training fields consist of four training fields, each training field in the set of training fields is mapped to four space-time streams according to a first space-time stream mapping matrix. When the set of training fields consists of six training fields, each training field in the set of training fields is mapped to six space-time streams according to a second space-time stream mapping matrix, wherein the first space-time stream mapping matrix is not a submatrix of the second space-time stream mapping matrix. A data portion of the data unit is generated so that a receiver device can receive the data portion via a corresponding number of space-time streams using channel information derived from the set of training fields.

    Abstract translation: 在生成用于经由通信信道进行传输的数据单元时，生成数据单元的前同步码，包括i）生成一组训练场，以及ii）将训练场集合中的每个训练场映射到多个空间 - 时间流。 当训练场集合由四个训练场组成时，根据第一时空流映射矩阵将训练场集合中的每个训练场映射到四个时空流。 当该组训练场由六个训练场组成时，根据第二时空流映射矩阵将训练场集合中的每个训练场映射到六个时空流，其中第一时空流映射矩阵为 不是第二个空时流映射矩阵的子矩阵。 生成数据单元的数据部分，使得接收机设备可以使用从训练场集合导出的信道信息经由相应数量的空时流来接收数据部分。

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