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公开(公告)号：US20170353199A1
公开(公告)日：2017-12-07
申请号：US15492902
申请日：2017-04-20
Applicant: DALI SYSTEMS CO. LTD.
Inventor： Wan-Jong Kim , Shawn Patrick Stapleton
CPC classification number: H04B1/0475 , H03F1/02 , H03F1/3241 , H03F3/24 , H04B1/0017 , H04B2001/0425 , H04B2001/0433 , H04B2001/045
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.
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12.发明申请公开(公告)号：US20160360500A1
公开(公告)日：2016-12-08
申请号：US15090402
申请日：2016-04-04
Applicant: Dali Systems Co. Ltd.
Inventor： Wan-Jong Kim , Shawn Patrick Stapleton
IPC: H04W56/00 , H04B7/04 , H04B17/318 , H04L5/14
CPC classification number: H04W56/0095 , H04B7/04 , H04B17/318 , H04L5/14 , H04L25/03 , H04W56/00
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.
Abstract translation: 在时分双工（TDD）系统中使用功率检测器检测同步切换脉冲的方法包括接收输入信号，使用数字功率计检测与输入信号相关联的功率电平，以及确定与输入相关联的配置 信号。 该方法还包括确定与输入信号相关联的脉冲宽度大于阈值，确定与特殊子帧配置相关联的偏移，以及生成估计的同步脉冲。 该方法还包括形成再生的同步脉冲，确定估计的同步脉冲和再生的同步脉冲之间的误差，确定误差小于阈值，并提供锁定检测。
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公开(公告)号：US20150171899A1
公开(公告)日：2015-06-18
申请号：US14553828
申请日：2014-11-25
Applicant: Dali Systems Co. Ltd.
Inventor： Wan-Jong Kim , Kyoung-Joon Cho , Shawn Patrick Stapleton
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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14.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：US09048797B2
公开(公告)日：2015-06-02
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
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。
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公开(公告)号：US20210051620A1
公开(公告)日：2021-02-18
申请号：US17072354
申请日：2020-10-16
Applicant: DALI SYSTEMS CO. LTD.
Inventor： Wan-Jong Kim , Shawn Patrick Stapleton
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.
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Patent Agency Ranking
公开(公告)号：US20190280722A1
公开(公告)日：2019-09-12
申请号：US16240433
申请日：2019-01-04
Applicant: DALI SYSTEMS CO. LTD.
Inventor： Wan-Jong Kim , Shawn Patrick Stapleton
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.
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公开(公告)号：US09948332B2
公开(公告)日：2018-04-17
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: H04L25/49 , H04B1/04 , H03F1/32 , H03F3/24 , H03F3/68 , H04B1/00 , H04W24/02 , H04W84/04 , H04W88/08
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.
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公开(公告)号：US09722939B2
公开(公告)日：2017-08-01
申请号：US14960177
申请日：2015-12-04
Applicant: DALI SYSTEMS CO. LTD.
Inventor： Shawn Patrick Stapleton , Wan-Jong Kim
CPC classification number: H04L47/38 , H04B1/0007 , H04B1/40 , H04B1/50 , H04W72/04
Abstract: A method for transporting communications signals includes receiving an analog IF signal at a first unit. The analog IF signal includes a first carrier having a first frequency and a first bandwidth and a second carrier having a second frequency different from the first frequency and a second bandwidth. The analog IF signal is converted to a digitally sampled IF signal having the first carrier located in a first Nyquist zone, the second carrier located in a second Nyquist zone, an image of the first carrier located in a third Nyquist zone, and an image of the second carrier located in the third Nyquist zone. The image of the first carrier and the image of the second carrier is transmitted from the first unit to a second unit, where the image of the first carrier and the image of the second carrier is then converted to the analog IF signal.
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公开(公告)号：US08913689B2
公开(公告)日：2014-12-16
申请号：US13777194
申请日：2013-02-26
Applicant: Dali Systems Co. Ltd.
Inventor： Wan-Jong Kim , Shawn Patrick Stapleton
CPC classification number: H04B1/0475 , H03F1/02 , H03F1/3241 , H03F3/24 , H04B1/0017 , H04B2001/0425 , H04B2001/0433 , H04B2001/045
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。
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20.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：US08824595B2
公开(公告)日：2014-09-02
申请号：US14020425
申请日：2013-09-06
Applicant: Dali Systems Co. Ltd.
Inventor： Wan-Jong Kim , Kyoung-Joon Cho , Shawn Patrick Stapleton , Ying Xiao
IPC: H04L25/49 , H03F1/32 , H04B1/00 , H03F3/68 , H04B1/04 , H03F3/24 , H04W88/08 , H04W84/04 , H04W24/02
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。
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