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公开(公告)号：US11071060B2
公开(公告)日：2021-07-20
申请号：US16176099
申请日：2018-10-31
Applicant: Marvell World Trade Ltd.
Inventor： Rui Cao , Hongyuan Zhang , Sudhir Srinivasa
IPC: H04B7/0413 , H04W52/02 , H04B7/06 , H04B7/04 , H04W84/12
Abstract: Embodiments described herein provide a method for transmitting a wake-up radio packet to low power devices in a wireless local area network. At a wireless access point having a plurality of antennas, data for transmission to one or more lower power wireless devices are received. A wake-up radio packet, including a wake-up data frame, is configured for transmission to the one or more lower power wireless devices. A waveform for transmitting the wake-up radio packet is generated. At each of the plurality of antennas, the waveform is adjusted with spatial mapping to prevent unintentional spatial nulling of the waveform during transmission of the wake-up radio packet. The wake-up radio packet is transmitted, via the plurality of antennas, in a form of the adjusted waveform to the one or more lower power wireless devices prior to transmitting the received data to the one or more lower power wireless devices.
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公开(公告)号：US10772056B2
公开(公告)日：2020-09-08
申请号：US16049732
申请日：2018-07-30
Applicant: Marvell World Trade Ltd.
Inventor： Hari Balakrishnan , Sri Varsha Rottela , Rui Cao , Hongyuan Zhang , Sudhir Srinivasa , Hua Mu , Xiayu Zheng
Abstract: A first communication device generates a first portion and a second portion of a wakeup radio (WUR) wakeup packet. The first portion of the WUR wakeup packet corresponds to a wireless local area network (WLAN) legacy preamble, and spans a first frequency bandwidth. The second portion of the WUR wakeup packet spans a second bandwidth that is less than the first bandwidth, and is configured to cause a WUR of a second communication device to cause a WLAN network interface device of the second communication device to transition from a low power state to the active state. Generating the second portion of the WUR wakeup packet includes i) generating a sync portion having a plurality of sync symbols, and ii) generating a wakeup packet body. The first communication device transmits the WUR wakeup packet.
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公开(公告)号：US10656256B2
公开(公告)日：2020-05-19
申请号：US15947306
申请日：2018-04-06
Applicant: Marvell World Trade Ltd.
Inventor： Liwen Chu , Sagar Tamhane , Hongyuan Zhang , Christian Berger , Niranjan Grandhe , Sudhir Srinivasa , Hui-Ling Lou
Abstract: During a service period (SP) for a ranging measurement signal exchange between a first communication device and one or more second communication devices, the first communication device receives respective first null data packets (NDPs) from the one or more second communication devices, and transmits respective second NDPs to the one or more second communication devices. The first communication device transmits, during the SP, respective first ranging measurement feedback packets to the one or more second communication devices to allow each of the one or more second communication devices to determine a time-of-flight between the first communication device and the second communication device and/or receives, during the SP, respective second ranging measurement feedback packets from the one or more second communication devices to allow the first communication device to determine respective times-of-flight between the first communication device and the one or more second communication devices.
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公开(公告)号：US10469297B2
公开(公告)日：2019-11-05
申请号：US16170919
申请日：2018-10-25
Applicant: MARVELL WORLD TRADE LTD.
Inventor： Hongyuan Zhang , Xiayu Zheng , Rui Cao , Mingguang Xu , Sudhir Srinivasa , Jie Huang
Abstract: A boundary within a last orthogonal frequency division multiplexing (OFDM) symbol of a PHY data unit is determined. Pre-encoder padding bits are added to a set of information bits to generate a set of padded information bits such that the set of padded information bits, after being encoded, fill one or more OFDM symbols up to the boundary within the last OFDM symbol. The set of padded information bits are encoded to generate a set of coded bits. A PHY preamble is generated to include a subfield that indicates the boundary. The one or more OFDM symbols are generated to include (i) the set of coded information bits in the one or more OFDM symbols up to the boundary to allow a receiving device to stop decoding the one or more OFDM symbols at the boundary, and (ii) post-encoder padding bits in the last OFDM symbol following the boundary.
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公开(公告)号：US10455534B2
公开(公告)日：2019-10-22
申请号：US15958319
申请日：2018-04-20
Applicant: MARVELL WORLD TRADE LTD.
Inventor： Hongyuan Zhang , Mao Yu , Su Khiong Yong , Sudhir Srinivasa
Abstract: Timestamps associated with when transmissions are sent and received between a pair of communication devices are used to determine a distance between the pair of communication devices. The communication devices operate according to a wireless communication protocol, which specifies that a requester of a ranging measurement session is to compensate for a clock frequency offset between the pair of communication device and that a responder is not to compensate for the clock frequency offset. As part of the ranging measurement session, the responder sends feedback to the requester, where the feedback includes timestamps recorded by the responder. The timestamps in the feedback are not compensated for the clock frequency offset by the responder. After receiving the feedback, the requester compensates the timestamps in the feedback for the clock frequency offset before using the timestamps to calculate the distance between the pair of communication devices.
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Patent Agency Ranking
公开(公告)号：US20190089503A1
公开(公告)日：2019-03-21
申请号：US16170891
申请日：2018-10-25
Applicant: Marvell World Trade Ltd.
Inventor： Hongyuan Zhang , Sudhir Srinivasa
CPC classification number: H04L5/0048 , H04L5/0053 , H04L27/2613 , H04W84/12
Abstract: A method for transmitting an 802.11ah packet is provided. A training field sequence is generated using control circuitry. A preamble for a packet is generated using the control circuitry. The preamble includes a training field symbol which includes the training field sequence. A portion of the training field sequence is within a plurality of guard tones of the training field symbol. The preamble is transmitted using transmit circuitry.
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公开(公告)号：US10135572B2
公开(公告)日：2018-11-20
申请号：US14846280
申请日：2015-09-04
Applicant: MARVELL WORLD TRADE LTD.
Inventor： Hongyuan Zhang , Sudhir Srinivasa , Rohit U. Nabar , Raja Banerjea
Abstract: In a method for generating a data unit conforming to a first communication protocol, a first field and a second field to be included in a preamble of the data unit are generated. The first field includes a first set of one or more information bits that indicate a duration of the data unit and is formatted such that the first field allows a receiver device that conforms to a second communication protocol to determine the duration of the data unit. The second field includes a second set of one or more information bits that indicate to a receiver device that conforms to the first communication protocol that the data unit conforms to the first communication protocol. The first field and the second field are modulated using a modulation scheme specified for a field corresponding to the first field and the second field, respectively, by the second communication protocol.
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公开(公告)号：US09948365B2
公开(公告)日：2018-04-17
申请号：US15682087
申请日：2017-08-21
Applicant: MARVELL WORLD TRADE LTD.
Inventor： Rohit U. Nabar , Hongyuan Zhang , Sudhir Srinivasa , Xiayu Zheng
IPC: H04B7/02 , H04L1/02 , H04B7/0417 , H04B7/06
CPC classification number: H04B7/0417 , H04B7/0617 , H04B7/0619 , H04B7/0626 , H04B7/063 , H04B7/0632 , H04B7/0634
Abstract: A first communication device determines that a second communication device is capable of using a transparent implicit beamforming technique to determine steering matrices for transmitting to the first communication device via a forward multiple input multiple output (MIMO) communication channel. In response to determining that the second communication device is capable of using the transparent implicit beamforming technique, the first communication device transmits at least a certain number of data units to the second communication device using a maximum number of spatial streams during a time period of a certain duration when the first communication device is otherwise using less than the maximum number of spatial streams to transmit other data units to the second communication device. Transmitting the certain number of data units using the maximum number of spatial streams permits the second communication device to use the transparent implicit beamforming technique to develop one or more steering matrices.
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公开(公告)号：US09768996B2
公开(公告)日：2017-09-19
申请号：US15212927
申请日：2016-07-18
Applicant: Marvell World Trade Ltd.
Inventor： Hongyuan Zhang , Xiayu Zheng , Rui Cao , Mingguang Xu , Sudhir Srinivasa , Jie Huang
CPC classification number: H04L27/2602 , H04B7/066 , H04L1/0009 , H04L1/0057 , H04L5/0007 , H04L5/0046 , H04L27/2605 , H04L27/2627 , H04L27/2628 , H04L27/2634
Abstract: One or more first padding bits are added to information bits to be included in a data portion of a data unit such that the information bits, after being encoded, fill one or more OFDM symbols up to a boundary within a last OFDM symbol. The information bits and the first padding bits are encoded to generate coded bits. After encoding, coded bits corresponding to the last OFDM symbol are padded, or constellation points generated based on the coded bits corresponding to the last OFDM symbol are padded, such that the padded coded bits or the padded constellation points occupy a remaining portion of the last OFDM symbol after the boundary. The last OFDM symbol of the data portion is generated to include the coded information bits corresponding to the last OFDM symbol, the first padding bits and second padding bits or padding constellation points added after encoding.
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10.发明申请公开(公告)号：US20160365942A1
公开(公告)日：2016-12-15
申请号：US15179150
申请日：2016-06-10
Applicant: Marvell World Trade Ltd.
Inventor： Yakun Sun , Hongyuan Zhang , Rui Cao , Sudhir Srinivasa
CPC classification number: H04L1/0008 , H04L1/0009 , H04L1/0041 , H04L1/0057 , H04L5/0007 , H04L27/2602
Abstract: Systems, apparatuses and methods described herein provide a method for padding a signal extension of orthogonal frequency-division multiplexing (OFDM) symbols. A transceiver may obtain. a plurality of data symbols for transmission, and determine that a number of information bits for a last symbol of the plurality of data symbols is not an integer value. A special padding rule may be applied to add padding bits to the last symbol. A number of coded bits for the last symbol may be determined when the number of information bits for the last symbol has changed, and the plurality of data symbols for data transmission may be encoded based on the determined number of coded bits for the last symbol.
Abstract translation: 本文描述的系统，装置和方法提供了一种用于填充正交频分复用（OFDM）符号的信号扩展的方法。 收发器可以获得。 用于发送的多个数据符号，并且确定多个数据符号中的最后一个符号的信息比特数不是整数值。 可以应用特殊的填充规则来将填充位添加到最后一个符号。 当最后一个符号的信息位的数量已经改变时，可以确定用于最后一个符号的多个编码比特，并且可以基于确定的最后一个符号的编码比特数来编码用于数据传输的多个数据符号。
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