公开(公告)号：US20080025381A1

公开(公告)日：2008-01-31

申请号：US11810371

申请日：2007-06-05

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

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

IPC分类号： H04B1/38

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。

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。