发明公开
EP0503588A2 Quadrature amplitude modulator with distortion compensation
失效
Quadraturamplitudenmodulator mit Verzerrungskompensation。
- 专利标题： Quadrature amplitude modulator with distortion compensation
- 专利标题（中）： Quadraturamplitudenmodulator mit Verzerrungskompensation。
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申请号： EP92104166.1申请日： 1992-03-11
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公开(公告)号： EP0503588A2公开(公告)日： 1992-09-16
- 发明人: Suzuki, Hiroshi
- 申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION , NTT MOBILE COMMUNICATIONS NETWORK INC.
- 申请人地址： 19-2 Nishi-Shinjuku 3-chome Shinjuku-ku, Tokyo 163-19 JP
- 专利权人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION,NTT MOBILE COMMUNICATIONS NETWORK INC.
- 当前专利权人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION,NTT MOBILE COMMUNICATIONS NETWORK INC.
- 当前专利权人地址： 19-2 Nishi-Shinjuku 3-chome Shinjuku-ku, Tokyo 163-19 JP
- 代理机构： Lehn, Werner, Dipl.-Ing.
- 优先权： JP45250/91 19910311
- 主分类号： H04L27/36
- IPC分类号： H04L27/36
摘要：
A quadrature amplitude modulator is described, which is capable of accurately compensating for linear distortions occurring during the modulation process.
The modulator includes a signal level detector (3) whose output is connected to a parameter generation unit (4), which determines the particular linear transformation to be applied to the I and Q baseband signals. The parameters of the linear transformation are calculated in the following order: DC offset, amplitude balance, and quadrature error. Each correction parameter is calculated in such a way as not to interfere with the correction due to a the previously calculated parameters.
The modulator includes a signal level detector (3) whose output is connected to a parameter generation unit (4), which determines the particular linear transformation to be applied to the I and Q baseband signals. The parameters of the linear transformation are calculated in the following order: DC offset, amplitude balance, and quadrature error. Each correction parameter is calculated in such a way as not to interfere with the correction due to a the previously calculated parameters.
公开/授权文献
- EP0503588B1 Quadrature amplitude modulator with distortion compensation 公开/授权日：1997-10-01
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