公开(公告)号：US20130094612A1

公开(公告)日：2013-04-18

申请号：US13705022

申请日：2012-12-04

Applicant: Dali Systems Co. Ltd., Maples Corporate Services

Inventor： Wan-Jong KIM ,  Kyoung-Joon CHO ,  Shawn Patrick STAPLETON

IPC: H04B1/62

CPC classification number: H04B1/0475 ,  H03F1/3247 ,  H03F2200/111 ,  H03F2200/451 ,  H04B1/62 ,  H04L27/2626 ,  H04L27/368

Abstract: A high performance and cost effective method of RF-digital hybrid mode power amplifier systems with high linearity and high efficiency for multi-frequency band wideband communication system applications is disclosed. The present disclosure enables a power amplifier system to be field reconfigurable and support multiple operating frequency bands on the same PA system over a very wide bandwidth. In addition, the present invention supports multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels.

公开(公告)号：US20230370098A1

公开(公告)日：2023-11-16

申请号：US18188216

申请日：2023-03-22

Applicant: DALI SYSTEMS CO. LTD.

Inventor： Wan-Jong KIM ,  Shawn Patrick STAPLETON

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

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

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：US20200351578A1

公开(公告)日：2020-11-05

申请号：US16929406

申请日：2020-07-15

Applicant: DALI SYSTEMS CO. LTD.

Inventor： Shawn Patrick STAPLETON ,  Sasa TRAJKOVIC

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

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.

公开(公告)号：US20140219174A1

公开(公告)日：2014-08-07

申请号：US14248597

申请日：2014-04-09

Applicant: Dali Systems Co., Ltd.

Inventor： Chengxun WANG ,  Shawn Patrick STAPLETON

IPC: H04W24/02

CPC classification number: H03F1/304 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3258 ,  H03F3/087 ,  H03F3/19 ,  H03F3/24 ,  H03F2200/18 ,  H03F2200/204 ,  H03F2200/207 ,  H03F2200/447 ,  H03F2200/451 ,  H03F2201/3206 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3215 ,  H03F2201/3224 ,  H03F2201/3227 ,  H04L25/067 ,  H04L25/08 ,  H04L27/0008 ,  H04L27/368 ,  H04W24/02

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 amplifers 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.

Abstract translation: 用于多个工作频带的远程无线电头单元（RRU）系统，由多个单个或多个宽带功率放大器驱动的多通道。 更具体地，本发明使得多频带RRU能够使用更少的功率放大器，以便减少多频带RRU的尺寸和成本。 本发明基于使用双工器和/或干扰消除系统技术来增加RRU的发射机信号和接收机信号之间的隔离的方法。