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    • 3. 发明授权
    • Optimal control method for adaptive feedforward linear amplifier
    • 自适应前馈线性放大器的最优控制方法
    • US06232837B1
    • 2001-05-15
    • US09417651
    • 1999-10-14
    • Ki Suk YooSang Gee KangJae Ick ChoiJong Suk Chae
    • Ki Suk YooSang Gee KangJae Ick ChoiJong Suk Chae
    • H03F126
    • H03F1/3229
    • Provided with an optimal control method for an adaptive feedforward linear amplifier that includes an adaptive controller connected to first and second PLLs (Phase Locked Loops) respectively determining frequency bands for a main signal component and a distortion signal component. The adaptive controller adaptively controls control voltages of a first variable phase shifter and a first variable attenuator constituting a main signal cancellation loop and control voltages of a second variable phase shifter and a second variable attenuator constituting an error signal cancellation loop. The optimal control method includes the steps of: (a) after initialization of necessary parameters, reading a strength of an input signal, determining the initial optimal control voltages of the first and second variable phase shifters and the first and second variable attenuators, outputting the corresponding control voltages, and setting the first PLL to read a main signal strength of the main signal cancellation loop; (b) controlling the optimal control voltages of the first variable phase shifter and the first variable attenuator until the main signal strength becomes lower than a first threshold, if the main signal strength exceeds the first threshold; (c) determining the main signal strength read out from the error signal cancellation loop, if the main signal strength is greater than the first threshold, repeat step (b), otherwise; and (d) controlling the optimal control voltages for the second variable phase shifter and the second variable attenuator until the difference between the main signal strength and the distortion signal strength becomes lower than a second threshold, if the difference is greater than the second threshold.
    • 提供了一种用于自适应前馈线性放大器的最佳控制方法,该自适应前馈线性放大器包括连接到分别确定主信号分量和失真信号分量的频带的第一和第二PLL(锁相环)的自适应控制器。 自适应控制器自适应地控制构成主信号消除环路的第一可变移相器和第一可变衰减器的控制电压以及构成误差信号消除环路的第二可变移相器和第二可变衰减器的控制电压。 最优控制方法包括以下步骤:(a)在必要参数初始化之后,读取输入信号的强度,确定第一和第二可变移相器以及第一和第二可变衰减器的初始最佳控制电压,输出 相应的控制电压,并设置第一PLL以读取主信号消除环路的主信号强度; (b)如果主信号强度超过第一阈值,则控制第一可变移相器和第一可变衰减器的最佳控制电压,直到主信号强度变得低于第一阈值为止; (c)确定从误差信号消除回路读出的主信号强度,如果主信号强度大于第一阈值,则重复步骤(b),否则; 以及(d)如果差值大于第二阈值,则控制第二可变移相器和第二可变衰减器的最佳控制电压,直到主信号强度和失真信号强度之间的差变得低于第二阈值。
    • 8. 发明授权
    • Dual polarization antenna and method for transmitting and receiving signal using the same
    • 双极化天线及其发送和接收方法
    • US08811525B2
    • 2014-08-19
    • US13356879
    • 2012-01-24
    • Soon Young EomYoung Bae JungSoon Ik JeonJae Ick Choi
    • Soon Young EomYoung Bae JungSoon Ik JeonJae Ick Choi
    • H04B7/06
    • H01Q1/246H01Q3/26H01Q21/06H01Q21/245
    • The present invention relates to a general active array antenna apparatus capable of environmentally and temporally controlling radio frequency (RF) polarization resource necessary for wireless communication in order to improve communication quality and increase communication capacity. The antenna according to the present invention has a form of an active array antenna element, wherein each active array antenna element has a structure in which it may generate orthogonal dual polarizations and includes two input terminals and output terminals. An end orthogonal dual polarization antenna is connected to a polarization control apparatus that may process analog or digital signals, and the polarization control apparatus is controlled by or communicate with an antenna main controlling apparatus performing a polarization control algorithm. Ultimately, an object of this antenna apparatus is to improve communication quality and increase communication capacity.
    • 本发明涉及能够环境和时间控制无线通信所需的射频(RF)极化资源的通用有源阵列天线装置,以提高通信质量并增加通信容量。 根据本发明的天线具有有源阵列天线元件的形式,其中每个有源阵列天线元件具有可以产生正交双极化的结构,并且包括两个输入端子和输出端子。 端正交双极化天线连接到可以处理模拟或数字信号的偏振控制装置,并且偏振控制装置由执行偏振控制算法的天线主控制装置控制或与其进行通信。 最终,该天线装置的目的是提高通信质量并增加通信容量。
    • 9. 发明申请
    • WEARABLE MAGNETIC RESONATOR FOR MRI RESOLUTION IMPROVEMENT, AND APPLICATION DEVICE INCLUDING THE SAME
    • 用于MRI分辨率改进的可磨损磁共振器和包括其的应用装置
    • US20100127707A1
    • 2010-05-27
    • US12625371
    • 2009-11-24
    • Wangjoo LEEDong Ho KimJeong Ho JuJae Ick Choi
    • Wangjoo LEEDong Ho KimJeong Ho JuJae Ick Choi
    • G01R33/44
    • G01R33/341G01R33/34007G01R33/34084G01R33/3628
    • Magnetic resonance imaging (MRI) devices detect a magnetic field having a particular frequency induced by hydrogen nuclei included in a human body and convert the detected magnetic field into two- or three-dimensional images, thereby visualizing the internal structure of the human body without causing any harm to the human body. The higher the resolution of an MRI technique, the more accurate a diagnosis can be obtained. Thus, various methods are introduced to improve resolutions. For example, a wearable magnetic resonator and an application device including the wearable magnetic resonator are provided. The wearable magnetic resonator is flexible and used to improve MRI resolution by amplifying MR signals while being attached to a human body to amplify MR signals when MRI is performed. The wearable magnetic resonator includes the following: a dielectric thin film that is flexible; and a conductor thin film that is disposed to have a split ring resonator (SRR) structure on the dielectric thin film and is flexible, wherein the wearable magnetic resonator includes an inductance component and a capacitance component, and the wearable magnetic resonator amplifies a magnetic field by resonating at a predetermined frequency, thereby improving a MRI resolution.
    • 磁共振成像(MRI)装置检测具有由包括在人体中的氢核诱发的特定频率的磁场,并将检测到的磁场转换为二维或三维图像,从而可视化人体的内部结构而不引起 对人体有任何伤害。 MRI技术的分辨率越高,诊断越准确。 因此,引入了各种方法来改进分辨率。 例如,提供了一种耐磨磁性谐振器和包括耐磨磁性谐振器的应用装置。 可佩戴的磁共振器是灵活的,并且用于通过在附接到人体时放大MR信号来提高MRI分辨率,以在执行MRI时放大MR信号。 可佩戴磁共振器包括:柔性的电介质薄膜; 以及布置成在所述电介质薄膜上具有开环谐振器(SRR)结构并且是柔性的导体薄膜,其中所述可穿戴磁共振器包括电感分量和电容分量,并且所述耐磨磁性谐振器放大磁场 通过以预定频率谐振,从而提高MRI分辨率。