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    High efficiency, remotely reconfigurable remote radio head unit system and method for wireless communications
    23.
    发明授权
    High efficiency, remotely reconfigurable remote radio head unit system and method for wireless communications 有权
    高效，远程可重构的远程无线电头单元系统和无线通信方法

    公开(公告)号：US08542768B2

    公开(公告)日：2013-09-24

    申请号：US12928943

    申请日：2010-12-21

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

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

    IPC: H04L25/49

    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 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 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. 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: 公开了一种用于在宽带通信系统中实现高效率和高线性度的远程无线电头单元（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。

    N-WAY DOHERTY DISTRIBUTED POWER AMPLIFIER WITH POWER TRACKING
    25.
    发明申请
    N-WAY DOHERTY DISTRIBUTED POWER AMPLIFIER WITH POWER TRACKING 有权
    具有电力跟踪功能的N-Way DOHERTY分布式功率放大器

    公开(公告)号：US20130009707A1

    公开(公告)日：2013-01-10

    申请号：US13553967

    申请日：2012-07-20

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

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

    IPC: H03F3/68

    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。

    Efficient Peak Cancellation Method for Reducing the Peak-To-Average Power Ratio in Wideband Communication Systems
    27.
    发明申请
    Efficient Peak Cancellation Method for Reducing the Peak-To-Average Power Ratio in Wideband Communication Systems 审中-公开
    用于降低宽带通信系统中的峰均功率比的高效峰值抵消方法

    公开(公告)号：US20090285194A1

    公开(公告)日：2009-11-19

    申请号：US12415676

    申请日：2009-03-31

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

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

    IPC: H04B7/216 ,  H04B7/00

    CPC classification number: H03F1/3247 ,  H03F1/3258 ,  H03F3/19 ,  H03F3/20 ,  H03F3/24 ,  H03F2200/129 ,  H03F2200/451 ,  H03F2201/3224 ,  H03F2201/3227 ,  H03F2201/3233

    Abstract: An efficient peak cancellation method for reducing the peak-to-average power ratio in wideband communication systems uses repeated clipping and frequency domain filtering to achieve a desired peak-to-average power ratio for wideband code division multiple access and orthogonal frequency division multiplexing signals. The maximum magnitude of the filtered pulse is determined by a scaling factor which permits eliminating several iterations while still achieving convergence to the targeted peak-to-average power ratio, thereby reducing computational load and saving hardware resources. This results in improved performance in terms of error vector magnitude, adjacent channel leakage ratio and peak-to-average power ratio.

    Abstract translation: 用于降低宽带通信系统中的峰值与平均功率比的有效的峰值抵消方法使用重复的限幅和频域滤波来实现宽带码分多址和正交频分复用信号所需的峰值与平均功率比。 经过滤波的脉冲的最大幅度由缩放因子决定，该比例因子可以消除多次迭代，同时仍然达到目标峰值与平均功率比的收敛，从而减少计算负荷并节省硬件资源。 这导致在误差矢量幅度，相邻信道泄漏比和峰值与平均功率比方面的性能提高。

    Daisy-chained ring of remote units for a distributed antenna system
    28.
    发明授权
    Daisy-chained ring of remote units for a distributed antenna system 有权
    用于分布式天线系统的远程单元的菊花链环

    公开(公告)号：US08737300B2

    公开(公告)日：2014-05-27

    申请号：US13211247

    申请日：2011-08-16

    Applicant: Shawn Patrick Stapleton ,  Paul Lemson ,  Bin Lin ,  Albert S. Lee

    Inventor： Shawn Patrick Stapleton ,  Paul Lemson ,  Bin Lin ,  Albert S. Lee

    IPC: H04W4/00

    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: The present disclosure is a novel utility of a software defined radio (SDR) based Distributed Antenna System (DAS) that is field reconfigurable and support multi-modulation schemes (modulation-independent), multi-carriers, multi-frequency bands and multi-channels. More specifically, the present invention relates to a DAS utilizing one or more Daisy-Chained Rings of Remote Units. The present invention enables a high degree of flexibility to manage, control, enhance, facilitate the usage and performance of a distributed wireless network such as Flexible Simulcast, automatic traffic load-balancing, network and radio resource optimization, network calibration, autonomous/assisted commissioning, carrier pooling, automatic frequency selection, frequency carrier placement, traffic monitoring, traffic tagging, pilot beacon, etc. As a result, a DAS in accordance with the present invention can increase the efficiency and traffic capacity of the operators' wireless network.

    Abstract translation: 本公开是基于软件定义无线电（SDR）的分布式天线系统（DAS）的新颖实用性，其是现场可重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 。 更具体地，本发明涉及利用一个或多个远程单元的菊花链的DAS。 本发明能够灵活地管理，控制，增强，促进分布式无线网络的使用和性能，例如灵活的模拟广播，自动流量负载平衡，网络和无线电资源优化，网络校准，自主/辅助调试 载波池，自动频率选择，载频布置，流量监控，流量标签，导频信标等。因此，根据本发明的DAS可以提高运营商的无线网络的效率和流量。

    SYSTEM AND METHOD FOR INCREASING BANDWIDTH FOR DIGITAL PREDISTORTION IN MULTI-CHANNEL WIDEBAND COMMUNICATION SYSTEMS
    29.
    发明申请
    SYSTEM AND METHOD FOR INCREASING BANDWIDTH FOR DIGITAL PREDISTORTION IN MULTI-CHANNEL WIDEBAND COMMUNICATION SYSTEMS 有权
    用于增加多通道宽带通信系统中数字预测的带宽的系统和方法

    公开(公告)号：US20130077713A1

    公开(公告)日：2013-03-28

    申请号：US13625760

    申请日：2012-09-24

    Applicant: Wan-Jong Kim ,  Shawn Patrick Stapleton ,  Sasa Trajkovic

    Inventor： Wan-Jong Kim ,  Shawn Patrick Stapleton ,  Sasa Trajkovic

    IPC: H04B15/00

    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。

    Multi-band wideband power amplifier digital predistorition system and method
    30.
    发明授权
    Multi-band wideband power amplifier digital predistorition system and method 有权
    多波段宽带功率放大器数字预失真系统及方法

    公开(公告)号：US08351877B2

    公开(公告)日：2013-01-08

    申请号：US12928934

    申请日：2010-12-21

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

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

    IPC: H04B1/04

    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.

    Abstract translation: 公开了一种用于多频带宽带通信系统应用的具有高线性度和高效率的RF数字混合模式功率放大器系统的高性能和成本有效的方法。 本公开使得功率放大器系统能够在现场可重新配置并且在非常宽的带宽上支持相同PA系统上的多个工作频带。 此外，本发明支持多调制方案（调制不可知），多载波和多信道。

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