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公开(公告)号：US20190222225A1
公开(公告)日：2019-07-18
申请号：US16352886
申请日：2019-03-14
Applicant: Marvell World Trade Ltd.
Inventor： Vijay Ahirwar , Sri Varsha Rottela , B Hari Ram
CPC classification number: H03M13/112 , G06F17/18 , H04L1/0005 , H04L25/067 , H04W84/12
Abstract: A receiver is configured for receiving a signal including a training field and a payload over a communication channel. The receiver includes a channel estimator, a scaling factor calculator, a metric calculator and a decoder. The channel estimator is configured to estimate values of a parameter of the communication channel based on the training field of the received signal. The scaling factor calculator is configured to calculate a scaling factor based on the values of the parameter of the communication channel. The metric calculator is configured to calculate soft decoding metrics for use in decoding data carried by the payload of the received signal, including scaling the soft decoding metrics by the scaling factor. The decoder is configured to decode the data carried by the payload of the received signal using the scaled soft decoding metrics.
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2.发明授权公开(公告)号：US09979449B2
公开(公告)日：2018-05-22
申请号：US15267957
申请日：2016-09-16
Applicant: Marvell World Trade Ltd.
Inventor： B Hari Ram , Lokesh Sundaramurthy Satrasala , Sri Varsha Rottela , Sudhir Srinivasa , Hongyuan Zhang , Chusong Xiao , Mao Yu , Yanni Chen , Yong Ma
IPC: H04Q1/20 , H04B7/0456 , H04L5/00 , H04W72/08 , H04L1/00
CPC classification number: H04B7/0456 , H04B7/0413 , H04L1/0054 , H04L5/0023 , H04W72/085
Abstract: Systems and methods for detecting data in a received multiple-input-multiple-output signal are provided. N signals are received from N respective antennas, where the received signals are associated with (i) M sets of data values, (ii) a set of symbols, and (iii) a set of carrier frequencies. The N signals are formed into a received signal vector y, and one or more transformations are performed on the received signal vector y to obtain a transformed vector. A plurality of samples are formed from the transformed vector. For samples of the plurality of samples, a data detection technique of a plurality of data detection techniques is selected. The selecting is based on at least one of a spatial stream, a symbol, and a carrier frequency associated with the given sample. The selected data detection, technique is used to detect data of the given sample.
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3.发明申请公开(公告)号：US20170117944A1
公开(公告)日：2017-04-27
申请号：US15267957
申请日：2016-09-16
Applicant: Marvell World Trade Ltd.
Inventor： B Hari Ram , Lokesh Sundaramurthy Satrasala , Sri Varsha Rottela , Sudhir Srinivasa , Hongyuan Zhang , Chusong Xiao , Mao Yu , Yanni Chen , Yong Ma
CPC classification number: H04B7/0456 , H04B7/0413 , H04L1/0054 , H04L5/0023 , H04W72/085
Abstract: Systems and methods for detecting data in a received multiple-input-multiple-output signal are provided. N signals are received from N respective antennas, where the received signals are associated with (i) M sets of data values, (ii) a set of symbols, and (iii) a set of carrier frequencies. The N signals are formed into a received signal vector y, and one or more transformations are performed on the received signal vector y to obtain a transformed vector. A plurality of samples are formed from the transformed vector. For samples of the plurality of samples, a data detection technique of a plurality of data detection techniques is selected. The selecting is based on at least one of a spatial stream, a symbol, and a carrier frequency associated with the given sample. The selected data detection, technique is used to detect data of the given sample.
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Patent Agency Ranking
公开(公告)号：US11229035B2
公开(公告)日：2022-01-18
申请号：US16706073
申请日：2019-12-06
Applicant: Marvell World Trade Ltd.
Inventor： B Hari Ram , Vijay Ahirwar , Sri Varsha Rottela , Nilesh N. Khude , Sudhir Srinivasa
Abstract: A method for transmitting a first physical layer (PHY) protocol data unit (PPDU) in a wireless local area network (WLAN) communication channel is described. One or more sectors of a service coverage area of a first communication device that are busy with a first transmission over the WLAN communication channel are identified. A second communication device is selected, using the identification of the one or more busy sectors, to receive the first PPDU during a second, directional transmission that at least partially temporally overlaps a duration of the first transmission. The first PPDU is generated for transmission to the second communication device. The first PPDU is transmitted to the second communication device as the second, directional transmission during the first transmission.
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公开(公告)号：US20190373569A1
公开(公告)日：2019-12-05
申请号：US16510992
申请日：2019-07-15
Applicant: Marvell World Trade Ltd.
Inventor： B Hari Ram , Sri Varsha Rottela , Vijay Ahirwar , Sudhir Srinivasa , Nilesh N Khude
IPC: H04W56/00 , H04B7/06 , H04B7/0413 , H04W16/28
Abstract: A method for communication includes respectively associating each of a plurality of client stations (STAs) with at least one basic service set (BSS) of at least one access point (AP) in a WLAN. The APs in the WLAN are synchronized prior to transmitting data to the STAs. First and second groups of the antennas are defined for downlink communication with the first and second STAs, each of the groups including antennas belonging to at least two of the APs. Different, first and second distributed beamforming parameters are computed over the first and second groups of the antennas. Respective data for transmission to the first and second STAs are distributed to the APs to which the antennas in the respective first and second groups belong and are transmitted in synchronization in accordance with the first and second distributed beamforming parameters.
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6.发明申请公开(公告)号：US20170118050A1
公开(公告)日：2017-04-27
申请号：US15251654
申请日：2016-08-30
Applicant: Marvell World Trade Ltd.
Inventor： B Hari Ram , Lokesh Sundaramurthy Satrasala , Sri Varsha Rottela
CPC classification number: H04L27/06 , H04L1/0054 , H04L25/0204 , H04L25/03159 , H04L25/03318 , H04L25/03891 , H04L25/067 , H04L2025/03426
Abstract: Systems and methods for detecting data in a received multiple-input-multiple-output signal are provided. N signals are received from N antennas, with M being greater than or equal to three. The N signals form a vector y and are associated with M sets of data values, where the M sets of data values form a vector x. A channel matrix (H) is estimated, and a QR decomposition of the channel matrix is performed, such that H=QR. The vector y is transformed into a vector z according to z=QHy. The R matrix and the rotated signal vector z are transformed such that one or more elements of the R matrix having complex number values are set equal to zero. Distance values are calculated using the transformed vector z and the vector x. Log likelihood ratio (LLR) values are calculated based on the distance values.
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公开(公告)号：US20200084786A1
公开(公告)日：2020-03-12
申请号：US16551948
申请日：2019-08-27
Applicant: Marvell World Trade Ltd.
Inventor： Ankit Sethi , Sudhir Srinivasa , Sayak Roy , B Hari Ram
Abstract: A WLAN AP includes an array of antennas, a transceiver and a processor. The transceiver is configured to transmit via the array of antennas downlink packets to WLAN STAs, and to receive uplink packets from the STAs. The processor is coupled to the transceiver and is configured to send a request to a plurality of the STAs to transmit a respective plurality of channel-sounding packets corresponding to the plurality of STAs, to receive the plurality of channel-sounding packets from the plurality of STAs in response to the request, to compute, based on the received plurality of channel-sounding packets, a beamforming matrix that defines subsequent transmission beams aimed toward at least a subset of the plurality of STAs, and to transmit one or more downlink data packets to one or more of the STAs via the array of antennas, in accordance with the beamforming matrix.
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8.发明授权公开(公告)号：US09929884B2
公开(公告)日：2018-03-27
申请号：US15251654
申请日：2016-08-30
Applicant: Marvell World Trade Ltd.
Inventor： B Hari Ram , Lokesh Sundaramurthy Satrasala , Sri Varsha Rottela
CPC classification number: H04L27/06 , H04L1/0054 , H04L25/0204 , H04L25/03159 , H04L25/03318 , H04L25/03891 , H04L25/067 , H04L2025/03426
Abstract: Systems and methods for detecting data in a received multiple-input-multiple-output signal are provided. N signals are received from N antennas, with M being greater than or equal to three. The N signals form a vector y and are associated with M sets of data values, where the M sets of data values form a vector x. A channel matrix (H) is estimated, and a QR decomposition of the channel matrix is performed, such that H=QR. The vector y is transformed into a vector z according to z=QHy. The R matrix and the rotated signal vector z are transformed such that one or more elements of the R matrix having complex number values are set equal to zero. Distance values are calculated using the transformed vector z and the vector x. Log likelihood ratio (LLR) values are calculated based on the distance values.
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