公开(公告)号：US20160113014A1

公开(公告)日：2016-04-21

申请号：US14887922

申请日：2015-10-20

Applicant: DALI SYSTEMS CO. LTD.

Inventor： Seyed Amin Hejazi ,  Shawn Patrick Stapleton

IPC: H04W72/04 ,  H04W52/04

CPC classification number: H04W16/10 ,  H04J11/0023 ,  H04L1/00 ,  H04L5/0023 ,  H04L2001/0093 ,  H04W28/06 ,  H04W52/04 ,  H04W72/04 ,  H04W72/0453 ,  H04W88/085

Abstract: A method for routing and switching operator RF signals includes providing one or more Digital Remote Units (DRUs) and providing at least one Digital Access Unit (DAU) configured to communicate with at least one of the one or more DRUs. A first DRU is operable to communicate using a first set of frequencies characterized by a first frequency band over a first geographic footprint and a second set of frequencies characterized by a second frequency band different from the first frequency band over a second geographic footprint including and surrounding the first geographic footprint. A second DRU is operable to communicate using the first set of frequencies over a third geographical footprint and a third set of frequencies characterized by a third frequency band different from the first frequency band and the second frequency band over a fourth geographic footprint including and surrounding the third geographic footprint.

Abstract translation: 用于路由和切换操作者RF信号的方法包括提供一个或多个数字远程单元（DRU）并提供被配置为与一个或多个DRU中的至少一个通信的至少一个数字接入单元（DAU）。 第一DRU可操作以使用第一组频率进行通信，所述第一组频率的特征在于第一地理覆盖区上的第一频带，以及第二组频率，其特征在于在第二地理覆盖区域上包括与周围的第二频带不同于第一频带 第一个地理足迹。 第二DRU可操作以在第三地理位置上使用第一组频率进行通信，并且第三组频率的特征在于第四频域和第二频带不同于第四地理空间的第三频带，其包括并围绕 第三地理足迹。

公开(公告)号：US09246731B2

公开(公告)日：2016-01-26

申请号：US14480285

申请日：2014-09-08

Applicant: Dali Systems Co. Ltd.

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

IPC: H03H7/30 ,  H04L27/26 ,  H03F1/32 ,  H03F3/24 ,  H04L25/03 ,  H04L27/36 ,  H04W24/02 ,  H04B1/04 ,  H04W24/04 ,  H04W40/00

CPC classification number: H04W40/02 ,  H03F1/3247 ,  H03F3/24 ,  H03F2200/336 ,  H03F2200/57 ,  H03F2201/3224 ,  H03F2201/3233 ,  H04B1/0475 ,  H04B7/022 ,  H04B2001/0425 ,  H04L25/03343 ,  H04L27/2618 ,  H04L27/362 ,  H04L2025/03414 ,  H04W24/02 ,  H04W24/04 ,  H04W40/00 ,  H04W72/04 ,  H04W72/0453

Abstract: An efficient baseband predistortion linearization method for reducing the spectral regrowth and compensating memory effects in wideband communication systems using effective multiplexing modulation technique such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. The present invention is based on the method of piecewise pre-equalized lookup table based predistortion, which is a cascade of a lookup table predistortion and piecewise pre-equalizers.

Abstract translation: 公开了一种使用诸如宽带码分多址和正交频分复用之类的有效复用调制技术在宽带通信系统中减少频谱再生长和补偿存储器效应的有效的基带预失真线性化方法。 本发明基于基于分段预均衡查找表的预失真的方法，该预失真是查找表预失真和分段预均衡器的级联。

公开(公告)号：US20150381217A1

公开(公告)日：2015-12-31

申请号：US14703579

申请日：2015-05-04

Applicant: Dali Systems Co., Ltd.

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

IPC: H04B1/04 ,  H04B1/00

CPC classification number: H04B1/0475 ,  H03F1/3247 ,  H03F3/24 ,  H03F3/68 ,  H03F2201/3224 ,  H04B1/0064 ,  H04W24/02 ,  H04W84/047 ,  H04W88/08 ,  H04W88/085 ,  Y02D70/00 ,  Y02D70/122 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/40

Abstract: A remote radio head unit (RRU) system is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier inside the RRU. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by a wideband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, embodiments of the present invention can compensate for the nonlinearities as well as memory effects of the power amplifier systems and also improve performance, 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, multi-frequency bands and multi-channels. Consequentially, 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：US09184703B2

公开(公告)日：2015-11-10

申请号：US14087682

申请日：2013-11-22

Applicant: Dali Systems Co., Ltd.

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

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

CPC classification number: H03F1/0288 ,  H03F1/0261 ,  H03F1/56 ,  H03F3/193 ,  H03F3/211 ,  H03F3/607 ,  H03F2200/451 ,  H03F2203/21106

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.

Abstract translation: 公开了一种使用具有自适应偏置电源功率跟踪的N路Doherty结构的功率放大器，用于在高峰值与平均功率之间扩展效率区域：多路调制信号比例，如宽带码分多址和正交频分复用 。 在一个实施例中，本发明使用双馈馈分布式结构到N路Doherty放大器来改善至少一个主放大器与至少一个峰化放大器之间的隔离，并且还可以在高输出下提高增益和效率性能 后退电源 混合耦合器可以在输入和输出中的任一个或两者上使用。 在至少一些实现中，由于放大，功率分配和组合的集成，电路空间也是保守的。

公开(公告)号：US20150304044A1

公开(公告)日：2015-10-22

申请号：US14621192

申请日：2015-02-12

Applicant: Dali Systems Co. Ltd.

Inventor： Shawn Patrick Stapleton ,  Sasa Trajkovic ,  Wolfgang Weber

IPC: H04B10/2575 ,  H04B10/564

CPC classification number: H04B10/25753 ,  H04B10/564 ,  H04W4/029 ,  H04W52/0206 ,  H04W52/245 ,  H04W52/285 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/162 ,  Y02D70/164 ,  Y02D70/46

Abstract: A method for operating a DAS includes providing a set of digital remote units (remotes) operable to send and receive wireless radio signals. Each of the set of remotes is associated with a geographic area. The method also includes providing a digital access unit (host) operable to communicate with the set of remotes, receiving uplink signals at one or more of the set of remotes, and monitoring train activity in the geographic areas. The method further includes increasing a gain coefficient associated with one of the set of remotes in response to determining an increase in monitored train activity, decreasing a gain coefficient associated with another of the set of remotes in response to determining a decrease in monitored train activity, and transmitting, to the host, scaled uplink signals associated with the one of the set of remotes and the another of the set of remotes.

Abstract translation: 用于操作DAS的方法包括提供可操作以发送和接收无线电信号的一组数字远程单元（遥控器）。 遥控器中的每一个与地理区域相关联。 该方法还包括提供可操作以与该组遥控器进行通信的数字接入单元（主机），在该组遥控器中的一个或多个远程接收器处接收上行链路信号，以及监视地理区域中的列车活动。 所述方法还包括响应于确定所监视的列车活动的增加而响应于确定所监视的列车活动的减少而减小与所述一组遥控器中的另一组相关联的增益系数，从而增加与所述一组遥控器相关联的增益系数， 以及向所述主机发送与所述一组遥控器中的一个和所述一组遥控器中的另一组相关联的缩放的上行链路信号。

公开(公告)号：US20150303999A1

公开(公告)日：2015-10-22

申请号：US14590447

申请日：2015-01-06

Applicant: Dali Systems Co. Ltd.

Inventor： Qianqi Zhuang ,  Shawn Patrick Stapleton

IPC: H04B7/02

CPC classification number: H04B7/024 ,  H04W84/22

Abstract: A system for transporting IP data in a Distributed Antenna System includes at least one Digital Access Units (DAU) having a plurality of optical input/output ports and at least one Ethernet port and a plurality of Digital Remote Units (DRUs) coupled to the at least one DAU. Each of the plurality of DRUs has a plurality of optical input/output ports and at least one Ethernet port. The at least one DAU includes a Framer/Deframer operable to separate cellular payload data from IP data and a network switch operable to buffer the cellular payload data and the IP data and to route the IP data received from the plurality of DRUs to the at least one Ethernet port of the DAU.

Abstract translation: 用于在分布式天线系统中传送IP数据的系统包括具有多个光输入/输出端口和至少一个以太网端口的至少一个数字接入单元（DAU）以及耦合到所述至少一个以太网端口的多个数字远程单元（DRU） 至少一个DAU。 多个DRU中的每一个具有多个光输入/输出端口和至少一个以太网端口。 所述至少一个DAU包括可操作以将蜂窝有效载荷数据与IP数据分离的成帧器/去帧器，以及可操作以缓冲蜂窝有效载荷数据和IP数据并将从多个DRU接收的IP数据路由至少至少 DAU的一个以太网端口。

公开(公告)号：US09025956B2

公开(公告)日：2015-05-05

申请号：US13754702

申请日：2013-01-30

Applicant: Dali Systems Co. Ltd.

Inventor： Shawn Patrick Stapleton ,  Sasa Trajkovic

IPC: H04J14/00 ,  H04B10/27 ,  H04W88/08

CPC classification number: H04Q11/0067 ,  H04B10/25753 ,  H04B10/27 ,  H04J14/0286 ,  H04Q11/0005 ,  H04Q2011/0016 ,  H04W40/02 ,  H04W88/085 ,  Y02D70/00 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/30

Abstract: A system for routing signals in a Distributed Antenna System includes a plurality of local Digital Access Units (DAUs) located at a Local location. Each of the plurality of local DAUs is coupled to each other and operable to route signals between the plurality of local DAUs. Each of the plurality of local DAUs includes one or more Base Transceiver Station (BTS) RF connections. Each of the plurality of BTS RF connections is operable to be coupled to one of one or more sectors of a BTS. The system also includes a plurality of remote DAUs located at a Remote location. The plurality of remote DAUs are coupled to each other and operable to transport signals between the plurality of remote DAUs.

Abstract translation: 用于在分布式天线系统中路由信号的系统包括位于本地位置的多个本地数字接入单元（DAU）。 多个本地DAU中的每一个彼此耦合并且可操作以在多个本地DAU之间路由信号。 多个本地DAU中的每一个包括一个或多个基站收发台（BTS）RF连接。 多个BTS RF连接中的每一个可操作以耦合到BTS的一个或多个扇区中的一个。 该系统还包括位于远程位置的多个远程DAU。 多个远程DAU彼此耦合并且可操作以在多个远程DAU之间传送信号。

公开(公告)号：US20150080054A1

公开(公告)日：2015-03-19

申请号：US14335647

申请日：2014-07-18

Applicant: DALI SYSTEMS CO. LTD.

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

IPC: H03F1/32 ,  H04B1/00 ,  H03F3/68

CPC classification number: H04B1/0475 ,  H03F1/3247 ,  H03F3/24 ,  H03F3/68 ,  H03F2201/3224 ,  H04B1/0064 ,  H04W24/02 ,  H04W84/047 ,  H04W88/08 ,  H04W88/085 ,  Y02D70/00 ,  Y02D70/122 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/40

Abstract: A remote radio head unit (RRU) system is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier inside the RRU. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by a wideband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, embodiments of the present invention can compensate for the nonlinearities as well as memory effects of the power amplifier systems and also improve performance, 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, multi-frequency bands and multi-channels. Consequentially, the remote radio head system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems.

Abstract translation: 公开了一种远程无线电头单元（RRU）系统。 本发明基于对RRU内的功率放大器进行线性化的自适应数字预失真的方法。 诸如放大器输出信号的线性度和非对称失真的功率放大器特性由宽带反馈路径监测并由数字模块中的自适应算法控制。 因此，本发明的实施例可以补偿功率放大器系统的非线性以及存储器效应，并且在功率附加效率，相邻信道泄漏比和峰值与平均功率比方面也提高性能。 本公开使得功率放大器系统能够是现场可重构的并且支持多调制方案（不可调制调制），多载波，多频带和多信道。 因此，远程无线电头系统特别适用于诸如基站，中继器和室内信号覆盖系统之类的无线传输系统。

公开(公告)号：US20150055593A1

公开(公告)日：2015-02-26

申请号：US14479875

申请日：2014-09-08

Applicant: DALI SYSTEMS CO. LTD.

Inventor： Paul Lemson ,  Shawn Patrick Stapleton ,  Sasa Trajkovic

IPC: H04W72/04

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.

Abstract translation: 公开了一种用于在分布式天线系统中实现高数据速率通信的远程无线电头单元（RRU）系统。 分布式天线系统配置为中性主机，使多个操作员能够存在于一个DAS系统上。 本公开使得远程无线电头单元能够是现场可重新配置的并且支持多调制方案（与调制无关），多载波，多频带和多信道。 因此，远程无线电头系统特别适用于诸如基站，中继器和室内信号覆盖系统之类的无线传输系统。

公开(公告)号：US20140376661A1

公开(公告)日：2014-12-25

申请号：US14480267

申请日：2014-09-08

Applicant: Dali Systems Co. Ltd.

Inventor： Wan-Jong Kim ,  Shawn Patrick Stapleton

IPC: H04B1/04

CPC classification number: H04B1/0475 ,  H03F1/3241 ,  H03F1/3247 ,  H04B1/0017 ,  H04B2001/0425 ,  H04L27/368

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.

Abstract translation: 提供数字预失真线性化方法来增加在宽带通信系统中使用的RF功率放大器的瞬时或者操作带宽。 本发明的实施例提供了一种使用集成到用于多信道宽带无线发射机的现有数字平台中的反馈滤波器来增加DPD线性化带宽的方法。 本发明的一个实施例利用DPD反馈信号与DPD反馈路径中的低功率带通滤波器相结合。