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    System and method of performing initial timing synchronization of receivers of modulated signals
    13.
    发明授权
    System and method of performing initial timing synchronization of receivers of modulated signals 有权

    公开(公告)号：US10129014B2

    公开(公告)日：2018-11-13

    申请号：US15441149

    申请日：2017-02-23

    Applicant: Samsung Electronics Co., Ltd.

    Inventor： Farrokh Etezadi ,  Linbo Li ,  Chun Kin Au Yeung ,  Xiaoqiang Ma

    IPC: H04L7/00 ,  H04L25/03

    Abstract: According to an embodiment of the present disclosure, a receiver of modulated signals comprises a signal mixer, a synchronization detector, and a data demodulator. The signal mixer is configured to perform baseband down-conversion of a signal according to a mixer frequency, the signal including a synchronization header and a data payload. The synchronization detector is configured to: generate a differential signal based on the signal, perform cross-correlation of the differential signal with a reference differential signal to generate a cross-correlation output, and analyze the cross-correlation output to detect an end of the synchronization header. The data demodulator is configured to demodulate the data payload in response to detection of the end of the synchronization header.

    System and method for user activity recognition using accelerometer
    15.
    发明授权
    System and method for user activity recognition using accelerometer 有权

    公开(公告)号：US10564177B2

    公开(公告)日：2020-02-18

    申请号：US15337531

    申请日：2016-10-28

    Applicant: Samsung Electronics Co., Ltd.

    Inventor： Xue Li ,  Linbo Li ,  Andrey Zobenko ,  Seongwook Song

    IPC: G01P15/18

    Abstract: A system to recognize user activity includes a filter to form a gravity measurement from a three-dimensional (3D) accelerometer measurement of a user activity; a body component extractor to form a body measurement of the user activity by removing the gravity measurement from the 3D accelerometer measurement; a rotation matrix calculator to form a rotation matrix that is used to rotate the extracted gravity to align with a predetermined direction, and to rotate the 3D accelerometer measurements and the body measurement to be the input to features determiner module; and a features determiner to determine values of a predetermined number of features of the user activity based on the rotated 3D accelerometer measurement and the rotated body measurement in which the predetermined number of features are invariant under arbitrary rotation of the accelerometer measurement around the predetermined direction.

    SYSTEM AND METHOD OF DETECTING END OF SYNCHRONIZATION HEADER OF MODULATED SIGNALS
    16.
    发明申请
    SYSTEM AND METHOD OF DETECTING END OF SYNCHRONIZATION HEADER OF MODULATED SIGNALS 审中-公开

    公开(公告)号：US20180323955A1

    公开(公告)日：2018-11-08

    申请号：US16031944

    申请日：2018-07-10

    Applicant: Samsung Electronics Co., Ltd.

    Inventor： Farrokh Etezadi ,  Linbo Li ,  Chun Kin Au Yeung ,  Xiaoqiang Ma

    IPC: H04L7/00 ,  H04L25/03

    CPC classification number: H04L7/0087 ,  H04L7/042 ,  H04L25/03019

    Abstract: A receiver of a modulated signal includes a synchronization detector configured to receive a signal indicative of the modulated signal and to detect an end of the synchronization header in the signal. The synchronization detector is configured to generate a differential signal based on the signal, perform cross-correlation of the differential signal with a reference differential signal to generate a cross-correlation output, compare a first sample of the cross-correlation output at a sample index associated with a hypothesized start frame delimiter (SFD) peak index with a second sample of the cross-correlation output at a sample index associated with a hypothesized preamble peak index, and detect an end of the synchronization header in response to a comparison result in which a magnitude of the first sample of the cross-correlation output is greater than a magnitude of the second sample of the cross-correlation output.

    Apparatus and method for coarse timing and frequency synchronization
    19.
    发明授权
    Apparatus and method for coarse timing and frequency synchronization 有权

    公开(公告)号：US10257012B2

    公开(公告)日：2019-04-09

    申请号：US15446673

    申请日：2017-03-01

    Applicant: Samsung Electronics Co., Ltd.

    Inventor： Xiaoqiang Ma ,  Hongbing Cheng ,  Linbo Li ,  Jungwon Lee

    IPC: H04L27/26

    Abstract: The apparatus includes a plurality of correlation processors configured to each receive a group of samples and generate correlations of each group of samples; a plurality of multipliers each configured to multiply the correlations of one of the plurality of correlation processors by a weight, wherein the weight of at least one of the plurality of multipliers is different from the weight of at least another one of the plurality of multipliers; a summation processor configured to sum the weight multiplied correlations of the plurality of multipliers for time n, where n is an integer; and a coarse timing and coarse frequency processor configured to generate a coarse timing and a coarse frequency based on the sum.

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