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11.发明申请公开(公告)号：US20200052659A1
公开(公告)日：2020-02-13
申请号：US16352065
申请日：2019-03-13
Applicant: DALI SYSTEMS CO. LTD.
Inventor： Wan Jong Kim
Abstract: A system for time aligning widely frequency spaced signals includes a digital predistortion (DPD) processor and a power amplifier coupled to the DPD processor and operable to provide a transmit signal at a power amplifier output. The system also includes a feedback loop coupled to the power amplifier output. The feedback loop comprises an adaptive fractional delay filter, a delay estimator coupled to the adaptive fractional delay filter, and a DPD coefficient estimator coupled to the delay estimator.
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12.发明申请公开(公告)号：US20160173040A1
公开(公告)日：2016-06-16
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
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N路Doherty结构的功率放大器，其具有自适应偏置电源功率跟踪，用于在诸如宽带码分多址和正交频分复用的复用调制信号的高峰值与平均功率比之间扩展效率区域。 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。
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公开(公告)号：US08548403B2
公开(公告)日：2013-10-01
申请号：US13776163
申请日：2013-02-25
Applicant: Dali Systems Co. Ltd.
Inventor： Wan Jong Kim , Shawn Patrick Stapleton
IPC: H04B1/04
CPC classification number: H03F1/3258 , H03F1/3247 , H03F1/3294 , H03F2200/204 , H03F2200/336 , H03F2200/57 , H03F2201/3224 , H03F2201/3233 , H04B1/0475 , H04L25/03038 , H04L25/03343 , H04L2025/03356 , H04L2025/03477
Abstract: A baseband-derived RF predistortion system using a lookup table having coefficients extracted at baseband and then applied at RF by means of a vector modulator. The architecture combines the narrowband advantage of envelope predistortion with the accuracy of baseband predistortion, and including compensation for memory effects. A polynomial-based alternative is also described.
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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
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.
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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
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.
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Patent Agency Ranking
公开(公告)号：US10263569B2
公开(公告)日：2019-04-16
申请号：US14956040
申请日：2015-12-01
Applicant: DALI SYSTEMS CO. LTD.
Inventor： Wan Jong Kim
Abstract: A system for time aligning widely frequency spaced signals includes a digital predistortion (DPD) processor and a power amplifier coupled to the DPD processor and operable to provide a transmit signal at a power amplifier output. The system also includes a feedback loop coupled to the power amplifier output. The feedback loop comprises an adaptive fractional delay filter, a delay estimator coupled to the adaptive fractional delay filter, and a DPD coefficient estimator coupled to the delay estimator.
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17.发明申请METHOD AND SYSTEM FOR ALIGNING SIGNALS WIDELY SPACED IN FREQUENCY FOR WIDEBAND DIGITAL PREDISTORTION IN WIRELESS COMMUNICATION SYSTEMS 审中-公开用于无线通信系统中用于宽带数字预测的频率偏移信号的方法和系统公开(公告)号：US20160344351A1
公开(公告)日：2016-11-24
申请号：US14956040
申请日：2015-12-01
Applicant: DALI SYSTEMS CO. LTD.
Inventor： Wan Jong Kim
CPC classification number: H03F1/3247 , H03F1/3258 , H03F3/189 , H03F3/24 , H03F3/245 , H03F2200/336 , H03F2200/451 , H04L25/03063 , H04L25/03343 , H04L27/0002 , H04L27/2627 , H04L27/2655 , H04L43/028
Abstract: A system for time aligning widely frequency spaced signals includes a digital predistortion (DPD) processor and a power amplifier coupled to the DPD processor and operable to provide a transmit signal at a power amplifier output. The system also includes a feedback loop coupled to the power amplifier output. The feedback loop comprises an adaptive fractional delay filter, a delay estimator coupled to the adaptive fractional delay filter, and a DPD coefficient estimator coupled to the delay estimator
Abstract translation: 用于时间对准宽频率信号的系统包括数字预失真（DPD）处理器和耦合到DPD处理器的功率放大器，并且可操作以在功率放大器输出端提供发射信号。 该系统还包括耦合到功率放大器输出的反馈回路。 反馈回路包括自适应分数延迟滤波器，耦合到自适应分数延迟滤波器的延迟估计器和耦合到延迟估计器的DPD系数估计器
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18.发明授权Method and system for aligning signals widely spaced in frequency for wideband digital predistortion in wireless communication systems 有权用于在宽带数字预失真的无线通信系统中对准频率宽的信号的方法和系统公开(公告)号：US09225296B2
公开(公告)日：2015-12-29
申请号：US13945736
申请日：2013-07-18
Applicant: DALI SYSTEMS CO. LTD.
Inventor： Wan Jong Kim
CPC classification number: H03F1/3247 , H03F1/3258 , H03F3/189 , H03F3/24 , H03F3/245 , H03F2200/336 , H03F2200/451 , H04L25/03063 , H04L25/03343 , H04L27/0002 , H04L27/2627 , H04L27/2655 , H04L43/028
Abstract: A system for time aligning widely frequency spaced signals includes a digital predistortion (DPD) processor and a power amplifier coupled to the DPD processor and operable to provide a transmit signal at a power amplifier output. The system also includes a feedback loop coupled to the power amplifier output. The feedback loop comprises an adaptive fractional delay filter, a delay estimator coupled to the adaptive fractional delay filter, and a DPD coefficient estimator coupled to the delay estimator.
Abstract translation: 用于时间对准宽频率信号的系统包括数字预失真（DPD）处理器和耦合到DPD处理器的功率放大器，并且可操作以在功率放大器输出端提供发射信号。 该系统还包括耦合到功率放大器输出的反馈回路。 反馈回路包括自适应分数延迟滤波器，耦合到自适应分数延迟滤波器的延迟估计器以及耦合到延迟估计器的DPD系数估计器。
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公开(公告)号：US20140327481A1
公开(公告)日：2014-11-06
申请号：US14271881
申请日：2014-05-07
Applicant: DALI SYSTEMS CO., LTD.
Inventor： Wan Jong Kim , Kyoung Joon Cho , Shawn Patrick Stapleton , Jong Heon Kim , Dali Yang
CPC classification number: H03F1/3247 , H03F1/3258 , H03F3/19 , H03F3/20 , H03F3/24 , H03F2200/129 , H03F2200/451 , H03F2201/3224 , H03F2201/3227 , H03F2201/3233
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.
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RF数字混合模式功率放大器系统。 本发明基于对RF域中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不对称失真的功率放大器特性由窄带反馈路径监测并由数字模块中的自适应算法控制。 因此，本发明可以补偿功率放大器系统的非线性和存储器效应，并且在功率附加效率，相邻信道泄漏比和峰均功率比方面也提高了性能。 本公开使得功率放大器系统能够是现场可重新配置的并且支持多调制方案（调制不可知），多载波和多信道。 结果，数字混合模式功率放大器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，其中基带I-Q信号信息不容易获得。
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20.发明授权Method and system for baseband predistortion linearization in multi-channel wideband communications systems 有权多通道宽带通信系统中基带预失真线性化的方法和系统公开(公告)号：US08855234B2
公开(公告)日：2014-10-07
申请号：US13887133
申请日：2013-05-03
Applicant: Dali Systems Co. Ltd.
Inventor： Wan Jong Kim , Kyoung Joon Cho , Jong Heon Kim , Shawn Patrick Stapleton
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，其是查找表预失真和分段预均衡器的级联。
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