Invention Publication
EP0503588A2 Quadrature amplitude modulator with distortion compensation
失效
Quadraturamplitudenmodulator mit Verzerrungskompensation。
- Patent Title: Quadrature amplitude modulator with distortion compensation
- Patent Title (中): Quadraturamplitudenmodulator mit Verzerrungskompensation。
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Application No.: EP92104166.1Application Date: 1992-03-11
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Publication No.: EP0503588A2Publication Date: 1992-09-16
- Inventor: Suzuki, Hiroshi
- Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION , NTT MOBILE COMMUNICATIONS NETWORK INC.
- Applicant Address: 19-2 Nishi-Shinjuku 3-chome Shinjuku-ku, Tokyo 163-19 JP
- Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION,NTT MOBILE COMMUNICATIONS NETWORK INC.
- Current Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION,NTT MOBILE COMMUNICATIONS NETWORK INC.
- Current Assignee Address: 19-2 Nishi-Shinjuku 3-chome Shinjuku-ku, Tokyo 163-19 JP
- Agency: Lehn, Werner, Dipl.-Ing.
- Priority: JP45250/91 19910311
- Main IPC: H04L27/36
- IPC: H04L27/36
Abstract:
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.
Public/Granted literature
- EP0503588B1 Quadrature amplitude modulator with distortion compensation Public/Granted day:1997-10-01
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