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    METHOD AND SYSTEM FOR LINK SYNCHRONIZATION IN AN LTE-TDD ARCHITECTURE
    71.
    发明申请
    METHOD AND SYSTEM FOR LINK SYNCHRONIZATION IN AN LTE-TDD ARCHITECTURE 有权

    公开(公告)号：US20210051620A1

    公开(公告)日：2021-02-18

    申请号：US17072354

    申请日：2020-10-16

    Applicant: DALI SYSTEMS CO. LTD.

    Inventor： Wan-Jong Kim ,  Shawn Patrick Stapleton

    IPC: H04W56/00 ,  H04L25/03 ,  H04W88/08 ,  H04L27/26 ,  H04B17/318 ,  H04B7/04

    Abstract: A method of detecting a synchronization switching pulse using a power detector in a time division duplexing (TDD) system includes receiving an input signal, detecting a power level associated with the input signal using a digital power meter, and determining a configuration associated with the input signal. The method also includes determining that a pulse width associated with the input signal is greater than a threshold, determining an offset associated with a special subframe configuration, and generating an estimated sync pulse. The method further includes forming a regenerated sync pulse, determining an error between the estimated sync pulse and the regenerated sync pulse, determining that the error is less than a threshold, and providing a lock detect.

    WIDE BANDWIDTH DIGITAL PREDISTORTION SYSTEM WITH REDUCED SAMPLING RATE
    73.
    发明申请
    WIDE BANDWIDTH DIGITAL PREDISTORTION SYSTEM WITH REDUCED SAMPLING RATE 审中-公开

    公开(公告)号：US20190280722A1

    公开(公告)日：2019-09-12

    申请号：US16240433

    申请日：2019-01-04

    Applicant: DALI SYSTEMS CO. LTD.

    Inventor： Wan-Jong Kim ,  Shawn Patrick Stapleton

    IPC: H04B1/04 ,  H03F1/32 ,  H03F3/24 ,  H03F1/02

    Abstract: A digital predistortion linearization method is provided for increasing the instantaneous or operational bandwidth for RF power amplifiers employed in wideband communication systems. Embodiments of the present invention provide a method of increasing DPD linearization bandwidth using a feedback filter integrated into existing digital platforms for multi-channel wideband wireless transmitters. An embodiment of the present invention utilizes a DPD feedback signal in conjunction with a low power band-pass filter in the DPD feedback path.

    DATA TRANSPORT IN A VIRTUALIZED DISTRIBUTED ANTENNA SYSTEM
    74.
    发明申请
    DATA TRANSPORT IN A VIRTUALIZED DISTRIBUTED ANTENNA SYSTEM 审中-公开

    公开(公告)号：US20190082243A1

    公开(公告)日：2019-03-14

    申请号：US16039182

    申请日：2018-07-18

    Applicant: Dali Systems Co. Ltd.

    Inventor： Shawn Patrick Stapleton ,  Sasa Trajkovic

    IPC: H04Q11/00 ,  H04J14/02 ,  H04B10/2575 ,  H04W40/02 ,  H04B10/27 ,  H04W88/08

    Abstract: A system for routing signals in a Distributed Antenna System (DAS) includes one or more local Digital Access Units (DAUs) located at a local location and one or more remote DAUs located at one or more remote locations. Each of the one or more local DAUs includes an optical port coupled to an upstream unit. The upstream unit includes at least one of a repeater, a baseband unit, a Base Transceiver Station (BTS), or a DAU. The one or more remote DAUs are coupled to the one or more local DAUs via one or more optical cables. A distance between the local location and each of the one or more remote locations is greater than two kilometers.

    NEUTRAL HOST ARCHITECTURE FOR A DISTRIBUTED ANTENNA SYSTEM
    76.
    发明申请
    NEUTRAL HOST ARCHITECTURE FOR A DISTRIBUTED ANTENNA SYSTEM 审中-公开

    公开(公告)号：US20180184404A1

    公开(公告)日：2018-06-28

    申请号：US15786396

    申请日：2017-10-17

    Applicant: Dali Systems Co. Ltd.

    Inventor： Paul Lemson ,  Shawn Patrick Stapleton ,  Sasa Trajkovic

    IPC: H04W72/04 ,  H04B1/18 ,  H04B1/40

    CPC classification number: H04W72/04 ,  H04B1/18 ,  H04B1/40

    Abstract: A remote radio head unit (RRU) system for achieving high data rate communications in a Distributed Antenna System is disclosed. The Distributed Antenna System is configured as a Neutral Host enabling multiple operators to exist on one DAS system. The present disclosure enables a remote radio head unit to be field reconfigurable and support multi-modulation schemes (modulation-independent), multi-carriers, multi-frequency bands and multi-channels. As a result, the remote radio head system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems.

    Indoor trilateralization using digital off-air access units
    78.
    发明授权
    Indoor trilateralization using digital off-air access units 有权

    公开(公告)号：US09958548B2

    公开(公告)日：2018-05-01

    申请号：US14199617

    申请日：2014-03-06

    Applicant: DALI SYSTEMS CO. LTD.

    Inventor： Daryl Meerkerk ,  Shawn Patrick Stapleton

    IPC: G01S19/13 ,  G01S19/11

    CPC classification number: G01S19/13 ,  G01S19/11

    Abstract: A system for indoor localization using satellite navigation signals in a Distributed Antenna System. The system includes a plurality of Off-Air Access Units (OAAUs), each operable to receive an individual satellite navigation signal from at least one of a plurality of satellite navigation systems (e.g., GPS, GLONASS, Galileo, QZSS, or BeiDou) and operable to route signals optically to one or more DAUs. The system further includes a plurality of remote DRUs located at a Remote location that are operable to receive signals from a plurality of local DAUs. Moreover, the system includes an algorithm to delay each individual satellite navigation signal for providing indoor localization at each of the plurality of DRUs.

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