公开(公告)号：US20170317746A1

公开(公告)日：2017-11-02

申请号：US15518146

申请日：2014-12-29

Applicant: SOUTHEAST UNIVERSITY

Inventor： Wei XU ,  Jia WANG ,  Hua ZHANG

IPC: H04B10/116 ,  H04B10/564 ,  H04B10/50 ,  H04B10/60 ,  H04B10/079

CPC classification number: H04B10/116 ,  G01S1/70 ,  G01S5/16 ,  H04B10/07955 ,  H04B10/502 ,  H04B10/564 ,  H04B10/60

Abstract: It discloses a precise locating method of utilizing indoor visible light communication system, which belongs to the field of visible light communication; arranging any number of light emitting diode (LED) lamps indoors, setting the signal transmission power of each LED lamp to be the same and fixing the absolute location of each LED lamp, the terminal required for locating is equipped with several receiving devices, whose relative positions are known, then a position coordinate of the terminal can be obtained by determining the geometric center position of this set of receiving devices through calculating the measured light signal power of the receiving devices on the terminal.

公开(公告)号：US20230152096A1

公开(公告)日：2023-05-18

申请号：US17723633

申请日：2022-04-19

Applicant: Southeast University

Inventor： Jiyao WANG ,  Wei XU ,  Ling QIN

IPC: G01C19/06

CPC classification number: G01C19/06

Abstract: Disclosed are an electrically-driven gyroscope having a housing capable of alternate rotation and a control method thereof, which relate to the field of electrically-driven gyroscopes. The electrically-driven gyroscope includes a rotating housing, an internal rotator, a drive motor composed of an electrical port part and a rotating part, a drive circuit, and a battery. The internal rotator is mechanically connected to the rotating part of the drive motor, and they can coaxially rotate. The electrical port part of the motor, the drive circuit, and the battery are mutually electrically connected, and are all connected inside the rotating housing. The electrical port part and the rotating part of the drive motor rotate with respect to each other under an interaction force. The used drive motor may be an inner rotor motor, an outer rotor motor, or an axial motor Further, during use, the present disclosure does not need to rely on an external force-applying object or the aerodynamic force by means of the disclosed design manner and the alternate control method for the housing, thus realizing autonomous continuous rotation and maintaining an upright alternate rotation posture until the battery is depleted.

公开(公告)号：US20170264410A1

公开(公告)日：2017-09-14

申请号：US15503722

申请日：2014-12-29

Applicant: SOUTHEAST UNIVERSITY

Inventor： Hua ZHANG ,  Xinru ZHENG ,  Wei XU

IPC: H04L5/00 ,  H04L25/02 ,  H04W72/04 ,  H04B7/0452

CPC classification number: H04L5/0048 ,  H04B7/0452 ,  H04L5/0023 ,  H04L5/006 ,  H04L5/0085 ,  H04L5/1469 ,  H04L25/0222 ,  H04W72/048

Abstract: Disclosed is a pilot allocation method based on coherence time for a large-scale multiple input multiple-output (MIMO) system. The present invention achieves optimal allocation of pilot resources by fully utilizing the feature that different users possibly have different moving speeds and coherence time of corresponding channels is accordingly different, thereby improving overall data transmission performance of the system and achieving certain practicability. Moreover, the present invention effectively uses limited transmission resources in the case of limited total transmission resources, thereby improving overall data transmission performance of the system and effectively reducing pilot contamination.