公开(公告)号：US10243711B1

公开(公告)日：2019-03-26

申请号：US15334550

申请日：2016-10-26

Applicant: Marvell International Ltd.

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

IPC: H04W52/54 ,  H04W56/00 ,  H04L25/02 ,  H04L27/26 ,  H04L5/00 ,  H04W72/04 ,  H04B7/0413

Abstract: A first communication device receives, from a second communication device, a synchronization frame having an allocation indicator that indicates a non-overlapping allocation of pilot tones. The first communication device generates a first data frame that comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols of a non-legacy training field portion, the plurality of OFDM symbols including only pilot tones corresponding to the non-overlapping allocation of pilot tones. The first communication device transmits, in response to the synchronization frame and via a multiple input, multiple output (MIMO) communication channel, the first data frame to the second communication device simultaneously with a transmission of a second data frame by a third communication device via the MIMO communication channel, wherein corresponding OFDM symbols of respective non-legacy training field portions of the first data frame and the second data frame include non-overlapping pilot tones according to the non-overlapping allocation.

公开(公告)号：US09154969B1

公开(公告)日：2015-10-06

申请号：US13626841

申请日：2012-09-25

Applicant: MARVELL INTERNATIONAL LTD.

Inventor： Sudhir Srinivasa ,  Xiayu Zheng ,  Hongyuan Zhang ,  Rohit U. Nabar ,  Riddhi Madani ,  Atul Salhotra ,  Erik Heinke ,  Brian Bosso

IPC: G06F11/00 ,  H04J1/16 ,  H04L1/00 ,  H04L12/26 ,  H04W24/00

CPC classification number: H04W24/00 ,  H04B17/14 ,  H04L43/0852

Abstract: In a method of calibrating a wireless communication device, a first sounding packet is transmitted from the wireless communication device to a calibration station. A first channel descriptor is generated based on the first sounding packet. A second sounding packet is transmitted from the calibration station to the wireless communication device. A second channel descriptor is generated based on the second sounding packet. The first channel descriptor and the second channel descriptor are obtained at a controller. Calibration coefficients indicative of one or both of phase imbalance and amplitude imbalance between a receive radio frequency (RF) chain and a transmit RF chain at the wireless communication device are generated based on the first and the second channel descriptors. The calibration coefficients are sent from the controller to the wireless communication device.

Abstract translation: 在校准无线通信设备的方法中，第一探测分组从无线通信设备发送到校准站。 基于第一探测包生成第一信道描述符。 第二探测包从校准站发送到无线通信设备。 基于第二探测包生成第二信道描述符。 在控制器处获得第一信道描述符和第二信道描述符。 基于第一和第二信道描述符生成指示无线通信设备处的接收射频（RF）链和发射RF链之间的相位不平衡和幅度不平衡之一或两者的校准系数。 校准系数从控制器发送到无线通信设备。

公开(公告)号：US10660128B1

公开(公告)日：2020-05-19

申请号：US16123037

申请日：2018-09-06

Applicant: Marvell International Ltd.

Inventor： Rui Cao ,  Xiayu Zheng

IPC: H04W74/08 ,  H04L27/26 ,  H04B7/06 ,  H04B7/0413

Abstract: Systems and methods for carrier sensing and symbol timing in a multiple-antenna communication system are provided. A wireless receiver receives two or more signals from two or more antennas, respectively. A set of column vectors comprising time samples obtained from each of the received signals at the two or more antennas are generated. A multiple-antenna eigen-combining (MAEC) vector is computed based on the set of column vectors. The respective received signals are multiplied with a corresponding combining coefficient of the MAEC vector to obtain a respective weighted signal. A combined signal is generated by adding the respective weighted signals and carrier sensing and symbol timing is performed on the two or more received signals based on the combined signal.

公开(公告)号：US10389414B1

公开(公告)日：2019-08-20

申请号：US15672117

申请日：2017-08-08

Applicant: Marvell International Ltd.

Inventor： Yihong Qi ,  Xiayu Zheng

IPC: H04B7/0413 ,  H03M13/00 ,  H03M13/11 ,  G06F15/78 ,  H02J50/50

Abstract: The present disclosure describes methods and apparatuses for matrix compensation to prevent rank deficiency. In some aspects, a channel matrix is formed based on channel feedback matrices that are received from multiple devices. The channel matrix is transformed to provide a channel covariance matrix, which is then decomposed into a unitary matrix and Eigen value matrix components. Diagonal values of the Eigen value matrix are increased to provide a compensated Eigen value matrix. Based on the compensated Eigen value matrix, a steering matrix is determined for steering transmissions through the channel to the multiple devices. By compensating the Eigen value matrix, rank deficiency issues that typically result in failed steering matrix calculations can be prevented. Alternately or additionally, a dynamic range of the steering matrix calculations may be reduced by compensating matrices, enabling steering matrices to be calculated with less-complex or fewer hardware resources.

公开(公告)号：US10348380B1

公开(公告)日：2019-07-09

申请号：US15611050

申请日：2017-06-01

Applicant: Marvell International Ltd.

Inventor： Yihong Qi ,  Xiayu Zheng

IPC: H04B7/06 ,  H04L25/02

Abstract: The present disclosure describes methods and apparatuses for singular value decomposition with norm sorting. In some aspects, a sounding frame is received through a channel of a wireless medium. Based on the sounding frame, a channel covariance matrix describing conditions of the channel can be determined. The channel covariance matrix is then decomposed, with an ortho-normal matrix, to provide an intermediate matrix of vectors. One or more vectors of the intermediate matrix are sorted based on a respective norm to provide a norm-sorted matrix of the vectors. A steering matrix for the channel is then generated by ortho-normalizing at least two vectors of the norm-sorted matrix. By so doing, a steering matrix can be generated quickly and efficiently for use in subsequent communication operations.

公开(公告)号：US09935794B1

公开(公告)日：2018-04-03

申请号：US14667448

申请日：2015-03-24

Applicant: Marvell International Ltd.

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

IPC: H04W52/54 ,  H04L27/26 ,  H04L25/02 ,  H04B7/0413 ,  H04W56/00

CPC classification number: H04L25/0226 ,  H04B7/0413 ,  H04W56/0035

Abstract: A method for use in a communication network is described. A plurality of data frames, transmitted simultaneously from respective ones of a plurality of second communication devices, are received at a first communication device via a multiple input, multiple output (MIMO) communication channel. A common carrier frequency offset (CFO) that is common to the data frames is estimated based on a legacy portion of a physical layer (PHY) preamble of the data frames. Each data frame is compensated based on the common CFO. Respective device-specific CFOs are estimated for channel estimation of the MIMO communication channel based on pilot tones of respective non-legacy training field portions of the data frames. The pilot tones have a non-overlapping allocation to the plurality of second communication devices and each device-specific CFO is specific to the corresponding second communication device. The respective non-legacy training field portions are compensated based on the corresponding device-specific CFO.