公开(公告)号：US20130114486A1

公开(公告)日：2013-05-09

申请号：US13671203

申请日：2012-11-07

Applicant: Dali Systems Co. Ltd.

Inventor： Gary Spedaliere ,  Albert S. Lee ,  Shawn Patrick Stapleton

IPC: H04W84/10 ,  H04W52/02

CPC classification number: H04B7/02 ,  H04B10/27 ,  H04J14/00 ,  H04W52/02 ,  H04W52/0206 ,  H04W84/10 ,  H04W88/08 ,  H04W88/085 ,  Y02D70/1262

Abstract: A virtualized DAS network includes one or more digital access units (DAUs) and one or more digital remote units (DRUs) coupled to the one or more DAUs. The virtualized DS network also includes a routing table associated with the one or more DAUs. A signal provided by the one or more DRUs includes one or more carriers and one or more pilot beacons.

Abstract translation: 虚拟化DAS网络包括耦合到一个或多个DAU的一个或多个数字访问单元（DAU）和一个或多个数字远程单元（DRU）。 虚拟化DS网络还包括与一个或多个DAU相关联的路由表。 由一个或多个DRU提供的信号包括一个或多个载波和一个或多个导频信标。

公开(公告)号：US11418155B2

公开(公告)日：2022-08-16

申请号：US16592615

申请日：2019-10-03

Applicant: Dali Systems Co. Ltd.

Inventor： Wan Jong Kim ,  Kyoung Joon Cho ,  Shawn Patrick Stapleton ,  Jong Heon Kim ,  Dali Yang

IPC: H03F1/32 ,  H03F3/24 ,  H03F3/19 ,  H03F3/20

Abstract: A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by the narrowband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, the present invention could compensate the nonlinearities as well as memory effects of the power amplifier systems and also improve performances, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.

公开(公告)号：US10863470B2

公开(公告)日：2020-12-08

申请号：US16563680

申请日：2019-09-06

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 ,  H04L5/14 ,  H04L5/00

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.

公开(公告)号：US10749553B2

公开(公告)日：2020-08-18

申请号：US16279535

申请日：2019-02-19

Applicant: Dali Systems Co. Ltd.

Inventor： Wan-Jong Kim ,  Shawn Patrick Stapleton

IPC: H03F1/32 ,  H04B1/04 ,  H04L27/36 ,  H04B1/00

Abstract: A method of operating a communications system includes receiving a signal at a digital predistorter (DPD), introducing predistortion to the signal using the DPD, and converting the predistorted signal to an analog signal using a digital-to-analog converter having a first bandwidth. The method also includes amplifying the analog signal, sampling the amplified signal using an analog-to-digital converter having a second bandwidth less than the first bandwidth, and extracting coefficients of the DPD from the sampled signal.

公开(公告)号：US20200137709A1

公开(公告)日：2020-04-30

申请号：US16563680

申请日：2019-09-06

Applicant: Dali Systems Co. Ltd.

Inventor： Wan-Jong Kim ,  Shawn Patrick Stapleton

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

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.

公开(公告)号：US20200092848A1

公开(公告)日：2020-03-19

申请号：US16406252

申请日：2019-05-08

Applicant: Dali Systems Co. Ltd.

Inventor： Paul Lemson ,  Shawn Patrick Stapleton ,  Sasa Trajkovic

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

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.

公开(公告)号：US10298177B2

公开(公告)日：2019-05-21

申请号：US14885890

申请日：2015-10-16

Applicant: Dali Systems Co. Ltd.

Inventor： Kyoung Joon Cho ,  Wan Jong Kim ,  Shawn Patrick Stapleton

IPC: H03F1/02 ,  H03F3/21 ,  H03F3/193 ,  H03F3/68 ,  H03F1/56 ,  H03F3/60

Abstract: A power amplifier using N-way Doherty structure with adaptive bias supply power tracking for extending the efficiency region over the high peak-to-average power ratio of the multiplexing modulated signals such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. In an embodiment, present invention uses a dual-feed distributed structure to an N-way Doherty amplifier to improve the isolation between at least one main amplifier and at least one peaking amplifier and, and also to improve both gain and efficiency performance at high output back-off power. Hybrid couplers can be used at either or both of the input and output. In at least some implementations, circuit space is also conserved due to the integration of amplification, power splitting and combining.

公开(公告)号：US10264626B2

公开(公告)日：2019-04-16

申请号：US13670290

申请日：2012-11-06

Applicant: Dali Systems Co. Ltd.

Inventor： Albert S. Lee ,  Shawn Patrick Stapleton ,  Paul Lemson ,  Gary Spedaliere

IPC: H04W84/04 ,  H04W88/08 ,  H04W4/70 ,  H04W4/90

Abstract: According to an embodiment of the present invention, a network is provided. The network may include a first base transceiver station (BTS). The first BTS may be operable to provide a first signal including a plurality of first carriers. The network may also include a second BTS operable to provide a second signal including a plurality of second carriers. The network may also include a set of one or more digital access units (DAUs), each of the one or more DAUs being coupled to at least one of the first BTS or the second BTS. A set of one or more digital remote units (DRUs) may be included in the network, each of the DRUs being coupled to one of the one or more DAUs and operable to broadcast the first signal or the second signal.

公开(公告)号：US10218392B2

公开(公告)日：2019-02-26

申请号：US15492902

申请日：2017-04-20

Applicant: DALI SYSTEMS CO. LTD.

Inventor： Wan-Jong Kim ,  Shawn Patrick Stapleton

IPC: H04B1/04 ,  H03F1/02 ,  H03F1/32 ,  H03F3/24 ,  H04B1/00

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.

公开(公告)号：US10153789B2

公开(公告)日：2018-12-11

申请号：US15718469

申请日：2017-09-28

Applicant: Dali Systems Co. Ltd.

Inventor： Chengxun Wang ,  Shawn Patrick Stapleton

IPC: H04B1/00 ,  H04B1/10 ,  H03F1/02 ,  H03F3/19 ,  H03F3/24 ,  H03F3/72 ,  H04B1/12 ,  H04B1/525 ,  H04B1/40

Abstract: A remote radio head. unit (RRU) system for multiple operating frequency bands, multi-channels, driven by a single or more wide band power amplifiers. More specifically, the present invention enables multiple-bands RRU to use fewer power amplifiers in order to reduce size and cost of the multi-band RRU. The present invention is based on the method of using duplexers and/or interference cancellation system technique to increase the isolation between the transmitter signal and receiver signal of the RRU.