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    Modified inverted-F antenna for wireless communication
    3.
    发明授权
    Modified inverted-F antenna for wireless communication 有权
    用于无线通信的改进的倒F天线

    公开(公告)号：US07450072B2

    公开(公告)日：2008-11-11

    申请号：US11729126

    申请日：2007-03-27

    申请人： Je Woo Kim ,  Kyung Sup Han ,  Volodymyr Rakytyanskyy ,  Oleksandr Sulima

    发明人： Je Woo Kim ,  Kyung Sup Han ,  Volodymyr Rakytyanskyy ,  Oleksandr Sulima

    IPC分类号： H01Q1/38 ,  H01Q1/48

    CPC分类号： H01Q9/0421 ,  H01Q1/243 ,  H01Q1/38 ,  H01Q9/42 ,  H01Q21/28

    摘要： An embodiment of the present invention is a modified inverted-F antenna for wireless communication. The antenna circuit includes a dielectric substrate having a first surface, a radiating stub on the first surface of the dielectric substrate, and a first ground plate on the first surface of the dielectric substrate to couple to ground. The first ground plate includes one or more grounded capacitive stubs spaced apart from the radiating stub. The one or more grounded capacitive stubs tune performance parameters for the antenna circuit.

    摘要翻译： 本发明的实施例是用于无线通信的改进的倒F型天线。 天线电路包括具有第一表面的电介质基底，介电基底的第一表面上的辐射短截线，以及介电基片的第一表面上的第一接地板，以耦合到地面。 第一接地板包括与辐射短截线间隔开的一个或多个接地电容短截线。 一个或多个接地电容性短线调谐天线电路的性能参数。

    Fast in-phase and quadrature imbalance calibration
    4.
    发明授权
    Fast in-phase and quadrature imbalance calibration 有权
    快速的同相和正交不平衡校准

    公开(公告)号：US08654885B2

    公开(公告)日：2014-02-18

    申请号：US11810371

    申请日：2007-06-05

    申请人： Chaekwan Lee ,  Peter A. Thompson ,  Bill Xenakis ,  Kyung Sup Han

    发明人： Chaekwan Lee ,  Peter A. Thompson ,  Bill Xenakis ,  Kyung Sup Han

    IPC分类号： H04L27/00

    CPC分类号： H04B1/30 ,  H04L27/364 ,  H04L27/3863

    摘要： An embodiment of the present invention includes a technique to calibrate receiver and transmitter in a communication system. N digitized samples I(n) and Q(n) are stored. The N digitized samples represent in-phase and quadrature (I-Q) components, respectively, of a down-converted signal from a receiver. The I-Q components are generated from a quadrature demodulator or modulator having I-Q imbalance. Phase and gain adjustment constants are computed from the N digitized samples to compensate for the I-Q imbalance using a closed form solution.Another embodiment of the present invention includes a technique to calibrate a transceiver in a communication system without using a calibrated reference receiver. A first test signal at a first frequency is injected to a transmitter having a quadrature modulator with I-Q imbalance. The quadrature modulator has a carrier frequency. The transmitter generates a transmitter signal. The transmitter signal is detected to generate a composite signal having the first test signal and a second test signal at a second frequency twice the first frequency. The composite signal is digitized. I-Q direct current (DC) offset, phase, and gain corrections are computed from the digitized composite signal to correct the I-Q imbalance using a closed form solution.

    摘要翻译： 本发明的实施例包括在通信系统中校准接收机和发射机的技术。 存储N个数字化样本I（n）和Q（n）。 N个数字化采样分别表示来自接收机的下变频信号的同相和正交（I-Q）分量。 I-Q分量由具有I-Q不平衡的正交解调器或调制器产生。 相位和增益调整常数是从N个数字样本中计算的，以使用闭合形式解决方案来补偿I-Q失衡。 本发明的另一个实施例包括在通信系统中校准收发器而不使用经校准的参考接收机的技术。 将第一频率的第一测试信号注入具有I-Q不平衡的正交调制器的发射机。 正交调制器具有载波频率。 发射机产生发射机信号。 检测发射机信号以产生具有第一频率的第二频率的第一测试信号和第二测试信号的复合信号。 复合信号被数字化。 从数字化复合信号计算I-Q直流（DC）偏移，相位和增益校正，以使用闭合形式解决方案来校正I-Q不平衡。

    METHODS AND SYSTEMS FOR CARRIER FREQUENCY OFFSET ESTIMATION AND CORRECTION OFDM/OFDMA SYSTEMS
    5.
    发明申请
    METHODS AND SYSTEMS FOR CARRIER FREQUENCY OFFSET ESTIMATION AND CORRECTION OFDM/OFDMA SYSTEMS 审中-公开
    载波频偏估计和校正OFDM / OFDMA系统的方法与系统

    公开(公告)号：US20090310691A1

    公开(公告)日：2009-12-17

    申请号：US12137548

    申请日：2008-06-12

    申请人： Jong Ro Park ,  Kyung Sup Han ,  Tae Ryun Chang

    发明人： Jong Ro Park ,  Kyung Sup Han ,  Tae Ryun Chang

    IPC分类号： H04L27/28

    CPC分类号： H04L27/266 ,  H04L5/0007

    摘要： Methods and apparatus for determining an accurate fractional carrier frequency offset (CFO) adjustment in an orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) system in an effort to properly compensate for the actual CFO between a transmitter and a receiver are provided. This enhanced fractional CFO adjustment may be based on a history of estimated fractional CFOs and estimated carrier-to-interference-plus-noise ratios (CINRs) and may be statistically derived from this history, therefore leading to a more accurate fractional CFO adjustment when compared to conventional fractional CFO estimations. A more accurate fractional CFO adjustment may lead to increased physical layer performance and decreased decoding errors (i.e., lower bit error ratio, or BER).

    摘要翻译： 用于在正交频分复用（OFDM）或正交频分多址（OFDMA）系统中确定准确的分数载波频率偏移（CFO）调整的方法和装置，以努力适当地补偿发射机和发射机之间的实际CFO 接收器。 这种增强的分数CFO调整可以基于估计的分数CFO和估计的载波与干扰加噪声比（CINR）的历史，并且可以从该历史统计导出，因此当比较时导致更准确的分数CFO调整 到常规分数CFO估计。 更精确的分数CFO调整可能导致物理层性能增加和解码错误降低（即，较低的误码率或BER）。

    Modified inverted-F antenna for wireless communication
    6.
    发明申请
    Modified inverted-F antenna for wireless communication 有权
    用于无线通信的改进的倒F天线

    公开(公告)号：US20070229366A1

    公开(公告)日：2007-10-04

    申请号：US11729126

    申请日：2007-03-27

    申请人： Je Woo Kim ,  Kyung Sup Han ,  Volodymyr Rakytyanskyy ,  Oleksandr Sulima

    发明人： Je Woo Kim ,  Kyung Sup Han ,  Volodymyr Rakytyanskyy ,  Oleksandr Sulima

    IPC分类号： H01Q1/38

    CPC分类号： H01Q9/0421 ,  H01Q1/243 ,  H01Q1/38 ,  H01Q9/42 ,  H01Q21/28

    摘要： An embodiment of the present invention is a modified inverted-F antenna for wireless communication. The antenna circuit includes a dielectric substrate having a first surface, a radiating stub on the first surface of the dielectric substrate, and a first ground plate on the first surface of the dielectric substrate to couple to ground. The first ground plate includes one or more grounded capacitive stubs spaced apart from the radiating stub. The one or more grounded capacitive stubs tune performance parameters for the antenna circuit.

    摘要翻译： 本发明的实施例是用于无线通信的改进的倒F型天线。 天线电路包括具有第一表面的电介质基底，介电基底的第一表面上的辐射短截线，以及介电基片的第一表面上的第一接地板，以耦合到地面。 第一接地板包括与辐射短截线间隔开的一个或多个接地电容短截线。 一个或多个接地电容性短线调谐天线电路的性能参数。