发明申请
US20040162038A1 Method for detecting quadrature modulator carrier leak adjusting point by geometrical analysis/calculation method, carrier leak adjusting method, and quadrature modulation apparatus
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基本信息:
- 专利标题： Method for detecting quadrature modulator carrier leak adjusting point by geometrical analysis/calculation method, carrier leak adjusting method, and quadrature modulation apparatus
- 专利标题（中）：通过几何分析/计算方法，载波泄漏调整方法和正交调制装置检测正交调制器载波泄漏调整点的方法
- 申请号：US10474391 申请日：2003-10-09
- 公开(公告)号：US20040162038A1 公开(公告)日：2004-08-19
- 发明人： Norio Kanazawa , Masahiro Tsuchiya
- 主分类号： H01Q011/12
- IPC分类号： H01Q011/12 ; H04B001/04 ; H04B001/02
摘要：
The first, second, and third pairs of DC voltages which set a modulated signal to a predetermined reference level while the levels of I and Q signals supplied to a quadrature modulator are set at null0null are sequentially obtained. On the basis of the first, second, and third pairs of DC voltages, at least three measurement points based on a combination of pairs of DC voltages which set the level of the modulated signal to the predetermined reference level are decided. The coordinates of the center of a virtual circle having the three measurement points positioned on its circumference are automatically calculated by a geometric analytical computation. Adjustment voltages to be added to the I and Q signals so as to cancel out a carrier leak contained in the modulated signal are obtained from the coordinates of the center.
摘要（中）：
依次获得将提供给正交调制器的I和Q信号的电平设置为“0”的第一，第二和第三对直流电压，其将调制信号设置为预定参考电平。 基于第一，第二和第三对直流电压，基于将调制信号的电平设置为预定参考电平的直流电压组合的至少三个测量点被确定。 通过几何分析计算自动计算具有位于其圆周上的三个测量点的虚拟圆的中心坐标。 从中心的坐标得到调整电压加到I和Q信号上，以抵消包含在调制信号中的载波泄漏。