公开(公告)号：US08953706B1

公开(公告)日：2015-02-10

申请号：US14259596

申请日：2014-04-23

Applicant: Marvell International Ltd.

Inventor： Arul Durai Murugan Palanivelu ,  Hongyuan Zhang ,  Swaroop Venkatesh

IPC: H04L27/00 ,  H04B7/02 ,  H04B7/04

CPC classification number: H04B7/0456 ,  H04B7/0452 ,  H04B7/0617 ,  H04L27/2626

Abstract: In a method for generating steering matrices for beamforming, one or more subsets of one or more maximum transmit steering matrices are selected, where the maximum transmit steering matrices correspond to a maximum number of spatial streams able to be transmitted from a transmitter to a receiver. The subsets correspond to an actual number of spatial streams to be transmitted, and the subsets are applied to spatial streams to be transmitted. In an apparatus for generating steering matrices, a steering matrix calculator is configured to determine, from maximum transmit steering matrices, a plurality of steering coefficients corresponding to an actual number of spatial streams.

Abstract translation: 在用于生成用于波束形成的导引矩阵的方法中，选择一个或多个最大发射导引矩阵的一个或多个子集，其中最大发射导向矩阵对应于能够从发射机发射到接收机的最大数量的空间流。 子集对应于要发送的空间流的实际数量，并且子集被应用于要发送的空间流。 在用于产生导向矩阵的装置中，导引矩阵计算器被配置为从最大发射导向矩阵确定与实际数量的空间流相对应的多个转向系数。

公开(公告)号：US08842713B1

公开(公告)日：2014-09-23

申请号：US14058730

申请日：2013-10-21

Applicant: Marvell International Ltd.

Inventor： Hongyuan Zhang ,  Zhiyu Yang

IPC: H04B1/00 ,  H04B1/707

CPC classification number: H04B1/707 ,  H04B7/0617 ,  H04B7/086

Abstract: A method implemented in a multiple-antenna transceiver includes adapting a plurality of sets of rake coefficients based on a plurality of signals received via a plurality of single-input, multiple-output (SIMO) channels. Each signal of the plurality of signals corresponds to a single signal transmitted by a remote transceiver, and each set of the adapted sets of rake coefficients corresponds to an estimate of a respective one of the plurality of SIMO channels. The method also includes selecting, according to at least one selection criterion, one coefficient from each set of the plurality of sets of rake coefficients, generating a transmit steering vector based on the selected coefficients, and applying the transmit steering vector to a signal to be transmitted to the remote transceiver.

Abstract translation: 在多天线收发机中实现的方法包括：基于经由多个单输入多输出（SIMO）信道接收的多个信号来适配多组耙体系数。 多个信号的每个信号对应于由远程收发器发射的单个信号，并且每组适应的耙机系数集合对应于多个SIMO信道中的相应一个的估计。 该方法还包括根据至少一个选择标准来选择来自多组耙子系数的每一组的一个系数，基于所选择的系数产生发射导向矢量，以及将发射导向矢量应用于待发射的信号 传输到远程收发器。

公开(公告)号：US08774304B1

公开(公告)日：2014-07-08

申请号：US13867514

申请日：2013-04-22

Applicant: Marvell International Ltd.

Inventor： Hongyuan Zhang ,  Rohit U. Nabar

IPC: H04B7/02

CPC classification number: H04B7/061 ,  H04B7/0417 ,  H04B7/0626 ,  H04B7/0691

Abstract: A method in a first communication device configured to transmit data units to a second communication device via a forward link, and receive data units from the second communication device via a reverse link, includes transmitting, from the first communication device, consecutive sounding data units via the forward link. Each consecutive sounding data unit is transmitted via a different subset of antennas. The method also includes receiving, at the first communication device, CSI corresponding to the forward link that was generated at the second communication device and based on the consecutive sounding data units transmitted to the second communication device. The method also includes determining, at the first communication device, a subset of antennas to use in receiving data units via the reverse link. The subset of antennas to use in receiving data units via the reverse link is determined based on the CSI corresponding to the forward link.

Abstract translation: 第一通信设备中的方法，被配置为经由前向链路向第二通信设备发送数据单元，以及经由反向链路从第二通信设备接收数据单元，包括：从第一通信设备经由 前向链接。 每个连续的探测数据单元经由不同的天线子集发送。 该方法还包括在第一通信设备处接收与在第二通信设备处生成的前向链路相对应的CSI，并且基于发送到第二通信设备的连续的探测数据单元。 该方法还包括在第一通信设备处确定用于经由反向链路接收数据单元的天线子集。 基于与前向链路对应的CSI来确定用于经由反向链路接收数据单元的天线子集。

公开(公告)号：US08699978B1

公开(公告)日：2014-04-15

申请号：US13867789

申请日：2013-04-22

Applicant: Marvell International Ltd.

Inventor： Rohit U. Nabar ,  Hongyuan Zhang ,  Arul Durai Murugan Palanivelu

IPC: H04B1/18

CPC classification number: H04L25/0228 ,  H04B7/0413 ,  H04L5/0023 ,  H04L25/0204 ,  H04W72/085

Abstract: A plurality of training signal sets are transmitted. Each training signal set includes information sufficient to determine a channel estimate corresponding to a communication channel from a first station to a second station. A refined channel estimate is determined based on reception of the plurality of training signal sets.

Abstract translation: 发送多个训练信号组。 每个训练信号组包括足以确定对应于从第一站到第二站的通信信道的信道估计的信息。 基于多个训练信号组的接收来确定精细信道估计。

公开(公告)号：US08494093B1

公开(公告)日：2013-07-23

申请号：US13674752

申请日：2012-11-12

Applicant: Marvell International Ltd.

Inventor： Hongyuan Zhang

IPC: H04L27/06

CPC classification number: H04B7/0417 ,  H04B7/0408 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/086 ,  H04L5/0023 ,  H04L5/0091

Abstract: Channel state information (CSI) for a single data stream transmitted via a plurality of antennas is determined in a hardware device. Cophasing angles for the plurality of antennas are determined in the hardware device using the CSI. The cophasing angles are transferred from the hardware device to a controller coupled to the hardware device. When steering vector feedback is to be transmitted, the steering vector feedback is generated in the controller based on the cophasing angles. When explicit CSI feedback is to be transmitted, the explicit CSI feedback is generated in the controller using the cophasing angles.

Abstract translation: 在硬件设备中确定通过多个天线发送的单个数据流的信道状态信息（CSI）。 使用CSI在硬件设备中确定多个天线的相位角。 同相角从硬件设备转移到耦合到硬件设备的控制器。 当要传送导向矢量反馈时，基于同相角在控制器中产生导向矢量反馈。 当要发送显式CSI反馈时，使用同相角在控制器中产生显式CSI反馈。

公开(公告)号：US10771498B1

公开(公告)日：2020-09-08

申请号：US15178979

申请日：2016-06-10

Applicant: MARVELL INTERNATIONAL LTD.

Inventor： Sagar A. Tamhane ,  Nayan D. Gaywala ,  Liwen Chu ,  Hongyuan Zhang ,  Hui-Ling Lou

IPC: H04L29/06 ,  H04W12/12 ,  H04W12/06

Abstract: Systems, methods, and other embodiments associated with validating de-authentication requests to prevent spoofing are described. According to one embodiment, an apparatus includes a wireless controller configured to receive a de-authentication request and determine whether the de-authentication request is invalid based on the wireless controller's receipt of two or more responses to a timing request sent by the wireless controller. Only one response is expected. The two or more responses include the address of a first station.

公开(公告)号：US10742285B1

公开(公告)日：2020-08-11

申请号：US15350985

申请日：2016-11-14

Applicant: Marvell International Ltd.

Inventor： Liwen Chu ,  Yakun Sun ,  Rui Cao ,  Hongyuan Zhang ,  Hui-Ling Lou

IPC: H04B7/06 ,  H04L5/00 ,  H04W84/12 ,  H04B7/0452 ,  H04L27/26

Abstract: A first communication device receives respective beamforming training data units simultaneously transmitted to the first communication device by multiple second communication devices. The first communication device generates, based on the respective beamforming training data units received from the multiple second communication devices, respective beamforming feedback data units to be transmitted to respective ones of the multiple second communication devices. The first communication device transmits the respective feedback data units to the respective ones of the multiple second communication devices.

公开(公告)号：US10588165B1

公开(公告)日：2020-03-10

申请号：US14963045

申请日：2015-12-08

Applicant: Marvell International Ltd.

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

IPC: H04W74/08 ,  H04W76/11 ,  H04L5/00 ,  H04W4/06 ,  H04B7/0452 ,  H04W72/04

Abstract: A method of determining whether a wireless communication medium is clear is carried out on a client device, and includes: associating with a first virtual access point (AP) of a plurality of virtual APs implemented by a physical AP; receiving, from a physical AP, a message identifying the basic service set (BSS) color of each of the plurality of virtual APs implemented by on the physical AP; detecting a packet data unit; measuring the energy of the packet data unit; decoding a BSS color from the packet data unit; if the decoded BSS color is the same as a BSS color in the message from the physical AP, then setting an energy threshold to a first level; if the decoded BSS color is not the same as any BSS color in the message from the physical AP, then setting an energy threshold to a second level, wherein the second level is higher than the first level; and transmitting or refraining from transmitting a packet data unit based on a comparison of the measured energy and the energy threshold.

公开(公告)号：US10581627B1

公开(公告)日：2020-03-03

申请号：US15418420

申请日：2017-01-27

Applicant: Marvell International Ltd.

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

IPC: H04L12/18 ,  H04L12/26 ,  H04W72/00 ,  H04B7/14 ,  H04W84/12 ,  H04W88/08

Abstract: The present disclosure includes systems and techniques relating to broadcast and multicast in a wireless communication system. In some implementations, an announcement frame indicating a broadcast or multicast service period to multiple second wireless devices is transmitted by a first wireless device. The announcement frame indicates (i) an end time of the broadcast or multicast service period and (ii) an order of a sequence of frames to be directed to the multiple second wireless devices. Each of the sequence of frames is transmitted at the first wireless device using a directional antenna pattern to a respective one of the multiple second wireless devices, according to the order of the sequence of frames indicated in the announcement frame. An acknowledgement frame in response to the each of the sequence of frames is received at the first wireless device from the respective one of the multiple second wireless devices.

公开(公告)号：US10554251B1

公开(公告)日：2020-02-04

申请号：US15977490

申请日：2018-05-11

Applicant: Marvell International Ltd.

Inventor： Liwen Chu ,  Hongyuan Zhang ,  Hui-Ling Lou

IPC: H04B1/7156 ,  H04W52/02 ,  H04M1/725

Abstract: A first wireless device determines, while a first and second wireless transceiver are powered off, start of a service period. The first wireless transceiver is turned on in response to the determination to enable the first wireless device to establish communication via a LP wireless channel while the second wireless transceiver is off. The first wireless device receives a request frame from a second wireless device and a time of a timing function is updated based on the request frame.