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

IPC: H03M13/11 ,  H04L1/00 ,  H04L25/06 ,  G06F17/18

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.

公开(公告)号：US10341053B2

公开(公告)日：2019-07-02

申请号：US15783314

申请日：2017-10-13

Applicant: Marvell World Trade Ltd.

Inventor： Vijay Ahirwar ,  Sri Varsha Rottela

IPC: G11C29/00 ,  H04L1/00 ,  H03M13/11 ,  H03M13/37 ,  H03M13/00

Abstract: Embodiments described herein provide a system for dynamically selecting a pre-processing scheme for an LDPC decoder. The system includes a receiver configured to detect transmission of a first data packet and receive a first set of data bits corresponding to a first portion of the first data packet. The system further includes a histogram generator configured to calculate log-likelihood ratios for each data bit from the first set of data bits, and generate a histogram based on the calculated log-likelihood ratios. The receiver is configured to continue receiving a second set of data bits corresponding to a second portion of the first data packet. The system further includes a selector configured to activate or inactivate a log-likelihood ratio pre-processing scheme on the received second set of data bits based on characteristics of the histogram.

公开(公告)号：US20170099063A1

公开(公告)日：2017-04-06

申请号：US15266458

申请日：2016-09-15

Applicant: Marvell World Trade Ltd.

Inventor： Vijay Ganwani ,  Vijay Ahirwar ,  Yui Lin ,  Sudhir Srinivasa ,  Hongyuan Zhang ,  Sridhar Narravula

IPC: H03M3/00 ,  H04L27/26 ,  H04B1/10 ,  H04L7/033

CPC classification number: H03M3/378 ,  H03M1/1085 ,  H03M1/1095 ,  H03M3/356 ,  H04B1/1036 ,  H04B2001/1063 ,  H04L7/0331 ,  H04L27/2636

Abstract: Apparatus for determining a signal-to-quantization-noise ratio of a quantization circuit includes a signal generator that generates an input test signal for input to the quantization circuit, circuitry for isolating, from output of the quantization circuit, a signal representing quantization noise, and circuitry for determining a ratio of the output of the quantization circuit to the signal representing quantization noise. The signal generator generates an analog test tone having a frequency, and the circuitry for isolating includes a notch filter filtering that frequency. Alternatively, the circuitry for isolating includes circuitry for generating a digital test signal, and a digital subtractor for subtracting the digital test signal from the output of the quantization circuit. According to another alternative, the circuitry for isolating includes a transformation circuit whose outputs represent a peak of the output of the quantization circuit and a noise floor of the output of the quantization circuit.

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

IPC: H04W72/08 ,  H04L25/02 ,  H04W24/04 ,  H04W24/08 ,  H04W84/12

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.

公开(公告)号：US20180109354A1

公开(公告)日：2018-04-19

申请号：US15783314

申请日：2017-10-13

Applicant: Marvell World Trade Ltd.

Inventor： Vijay Ahirwar ,  Sri Varsha Rottela

IPC: H04L1/00 ,  H03M13/11

CPC classification number: H04L1/0045 ,  H03M13/1102 ,  H03M13/1111 ,  H03M13/3707 ,  H03M13/3723 ,  H03M13/612 ,  H03M13/6325 ,  H03M13/658 ,  H03M13/6594 ,  H04L1/0051 ,  H04L1/0058 ,  H04L1/0061

Abstract: Embodiments described herein provide a system for dynamically selecting a pre-processing scheme for an LDPC decoder. The system includes a receiver configured to detect transmission of a first data packet and receive a first set of data bits corresponding to a first portion of the first data packet. The system further includes a histogram generator configured to calculate log-likelihood ratios for each data bit from the first set of data bits, and generate a histogram based on the calculated log-likelihood ratios. The receiver is configured to continue receiving a second set of data bits corresponding to a second portion of the first data packet. The system further includes a selector configured to activate or inactivate a log-likelihood ratio pre-processing scheme on the received second set of data bits based on characteristics of the histogram.

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.

公开(公告)号：US20190312325A1

公开(公告)日：2019-10-10

申请号：US16370999

申请日：2019-03-31

Applicant: Marvell World Trade Ltd.

Inventor： Vijay Ahirwar ,  Sai-Wang Tam ,  Alden C. Wong

IPC: H01P3/06

Abstract: A waveguide includes a core and an electrically-conductive transmission line. The core includes an electrically-insulating material that is transmissive at millimeter-wave frequencies. The core is configured to receive a millimeter-wave signal at a first end of the waveguide, and to guide the millimeter-wave signal to a second end of the waveguide. The electrically-conductive transmission line is coupled in propinquity to the core and is configured to conduct an electrical signal between the first end of the waveguide and the second end of the waveguide, in parallel with the millimeter-wave signal guided in the core.