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公开(公告)号：US08948150B1
公开(公告)日：2015-02-03
申请号：US14094687
申请日：2013-12-02
Applicant: Marvell International Ltd.
Inventor： Hongyuan Zhang , Rohit U. Nabar , Hui-Ling Lou , Sudhir Srinivasa , Arul Durai Murugan Palanivelu
CPC classification number: H04W84/02 , H04J11/00 , H04L1/0643 , H04L27/2626
Abstract: In a method for transmitting information in a wireless local area network (WLAN), a plurality of different data streams corresponding to a plurality of different devices are orthogonally multiplexed onto a single symbol stream without using channel state information corresponding to a plurality of channels between a transmitting device and the plurality of different devices. One or more transmit streams are generated using the single symbol stream.
Abstract translation: 在用于在无线局域网（WLAN）中发送信息的方法中，对应于多个不同设备的多个不同数据流被正交地复用到单个符号流上，而不使用对应于多个信道之间的信道状态信息 发送装置和多个不同的装置。 使用单个符号流生成一个或多个发送流。
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12.发明授权公开(公告)号：US11166159B1
公开(公告)日：2021-11-02
申请号：US16005437
申请日：2018-06-11
Applicant: Marvell International Ltd.
Inventor： Christian Raimund Berger , Liwen Chu , Sudhir Srinivasa , Niranjan Grandhe
Abstract: The present disclosure describes methods and apparatuses for secure fine timing measurement (FTM) with encoded long training fields (LTFs). In some aspects, a device transmits an announcement frame for an FTM exchange that includes an indication of encoding. Based on the indication of encoding, an LTF of a first null data packet (NDP) of the FTM exchange is encoded. The device transmits the first NDP having the encoded LTF to another device, and receives, from the other device, a second NDP having an encoded LTF. A round-trip time for the first and second NDPs with encoded LTFs is determined. Based on this round-trip time, a distance between the device and the other device can be determined. By encoding the LTFs of the NDPs of the FTM exchange, third parties can be prevented from spoofing an FTM frame to compromise the FTM exchange and related proximity-based security.
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公开(公告)号：US10890644B1
公开(公告)日：2021-01-12
申请号：US16046108
申请日：2018-07-26
Applicant: Marvell International Ltd.
Inventor： Christian R. Berger , Niranjan Grandhe , Sudhir Srinivasa
Abstract: At a receiver in a short-range wireless system having a plurality of channels and a plurality of receiving antennas, an angle-of-arrival of a signal is determined by receiving, at at least two antennas, the signal on one of the channels, determining a phase difference between the signal as received at those antennas, removing a local oscillator phase from the phase difference to provide an adjusted phase difference, and determining, from the adjusted phase difference, the angle-of-arrival. Removing the local oscillator phase includes estimating a local oscillator phase for each channel to be used for all antennas, or determining an angle using multi-channel combining, and for each channel, using that angle to determine a channel local oscillator phase, or, for a given channel, identifying, as the local oscillator phase, a phase that minimizes the sum, over all antennas, of squares of phase differences between the given channel and a neighboring channel.
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公开(公告)号：US10476539B1
公开(公告)日：2019-11-12
申请号：US16046114
申请日：2018-07-26
Applicant: Marvell International Ltd.
Inventor： Christian R. Berger , Niranjan Grandhe , Sudhir Srinivasa
Abstract: Adjusting automatic gain control of a receiver, in a short-range wireless system having a plurality of channels and a plurality of receiving antennas, includes setting initial gain to be set by receiver AGC based on signals received at a receiver reference antenna, receiving, at each of the receiving antennas, a signal on a current channel, and adjusting gain to be set by AGC for the signal to prevent saturation. Angle-of-arrival estimation may be performed following adjusting of the AGC. Adjusting AGC may include backing off the AGC, changing the reference antenna prior to deriving gain to be set by AGC, or determining gain to be set by AGC at additional receiving antennas, and for each antenna that is not the reference antenna and is not one of the additional antennas, selecting gain to be set by AGC from a closest one of the reference antenna and the additional antennas.
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公开(公告)号：US10454798B1
公开(公告)日：2019-10-22
申请号：US15376267
申请日：2016-12-12
Applicant: Marvell International Ltd.
Inventor： Yakun Sun , Hongyuan Zhang , Liwen Chu , Sudhir Srinivasa
IPC: H04L12/26 , H04L12/841 , H04L5/00 , H04L12/18
Abstract: A method for adjusting an arrival time of a first orthogonal frequency division multiplex (OFDM) data unit of an uplink multi-user (MU) data unit is described. Respective round trip times (RTTs) are determined by a first communication device for multiple communication devices that communicate with the first communication device. A first time offset for a second communication device of the multiple communication devices is determined by the first communication device based on the respective RTTs. The first OFDM data unit is to be transmitted by the second communication device. A first timing control message that indicates the first time offset is generated by the first communication device. The first timing control message is caused by the first communication device to be transmitted to the second communication device.
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Patent Agency Ranking
公开(公告)号：US10432760B1
公开(公告)日：2019-10-01
申请号：US15809019
申请日：2017-11-10
Applicant: Marvell International Ltd.
Inventor： Hongyuan Zhang , Sudhir Srinivasa
Abstract: A network interface of a wireless network device generates a cyclic redundancy check (CRC) sequence using information bits of a signal field of a physical layer (PHY) preamble of a PHY data unit, including generating the CRC sequence using a CRC polynomial. The network interface generates a CRC field to be included in the signal field, including generating the CRC field to include a portion of the CRC sequence. The network interface generates the PHY data unit to include the PHY preamble, the PHY preamble having the signal field, the signal field having the information bits and the CRC field that includes the portion of the CRC sequence, where the PHY data unit is generated such that the signal field does not include the entire CRC sequence. The network interface generates a transmission signal for transmission in the wireless network, the transmission signal corresponding to the PHY data unit.
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公开(公告)号：US10070482B1
公开(公告)日：2018-09-04
申请号：US15645335
申请日：2017-07-10
Applicant: Marvell International Ltd.
Inventor： Hongyuan Zhang , Rohit U. Nabar , Sudhir Srinivasa , Raja Banerjea , Yong Liu
Abstract: A preamble, a first portion of a data payload, a midamble, and a second portion of the data payload of a single data unit are generated. The midamble is to be transmitted subsequent to transmission of the first portion of the data payload and prior to transmission of the second portion of the data payload. The midamble includes an indication of at least one characteristic of the data payload such as an indication of a size of the second portion of the data payload, or whether or not the data payload includes one or more other portions in addition to the first and second portions. A network interface of a communication device is configured to generate the preamble, the first and second portions of the data payload, and the midamble.
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18.发明授权公开(公告)号：US10038996B1
公开(公告)日：2018-07-31
申请号：US14327298
申请日：2014-07-09
Applicant: MARVELL INTERNATIONAL LTD.
Inventor： Sudhir Srinivasa , Hongyuan Zhang , Yakun Sun , Yan Zhang
IPC: H04W4/00 , H04W8/18 , H04B7/0452
CPC classification number: H04W8/186 , H04B7/0452
Abstract: A method in a communication network includes obtaining descriptions of a plurality of communication channels. Each communication channel is associated with a different one of a plurality of receivers. The method also includes identifying, based on the descriptions of the plurality of communication channels, two or more communication channels that satisfy one or more predetermined constraints related to orthogonality between the two or more communication channels. The method further includes selecting, to be included in a group of receivers, receivers associated with the two or more identified communication channels. The method additionally includes transmitting, to the group of receivers, at least one data unit that includes data intended for each receiver in the group.
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公开(公告)号：US10003477B1
公开(公告)日：2018-06-19
申请号：US15152072
申请日：2016-05-11
Applicant: Marvell International Ltd.
Inventor： Ankit Sethi , Swaroop Venkatesh , Sudhir Srinivasa , Hongyuan Zhang
CPC classification number: H04L25/0204 , H04L25/0228 , H04L25/0242 , H04L27/2657 , H04L27/2695
Abstract: Methods and systems are disclosed herein for performing channel estimation for multi-stream packets. The method may include receiving a data packet comprising a plurality of training fields, wherein the plurality of training fields comprises a training field, wherein the training field comprises a plurality of tones, and wherein the plurality of tones comprises a first tone and a second tone. The method may include modifying the first tone based on a predetermined signal associated with the first tone. The method may include storing the first tone in a data structure associated with the first tone. The method may include modifying the data structure based on the second tone.
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20.发明授权公开(公告)号：US09860096B1
公开(公告)日：2018-01-02
申请号：US15241775
申请日：2016-08-19
Applicant: Marvell International Ltd.
Inventor： Vijay Ganwani , Swaroop Venkatesh , Ankit Sethi , Sudhir Srinivasa
CPC classification number: H04L27/2082 , H04W4/04
Abstract: Embodiments described herein provide a method for carrier frequency offset and frequency drift cancellation based indoor position estimation. A wireless signal including a plurality of data samples is received at a receiving antenna and from a mobile device. Information relating to an antenna switching pattern for transmitting or receiving the wireless signal may then be obtained from the wireless signal. A phase difference is calculated associated with each data sample of plurality of data samples. Carrier frequency offset and frequency drift cancellation may be applied to the phase difference to obtain a compensated phase difference. A direction estimate of the mobile device may then be generated based at least in part on the compensated phase difference.
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