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Calibrating amplitude and phase imbalance and DC offset of an analog i /q modulator in a high-frequency transmitter

A technology of modulator and transmitter, which is applied in the direction of modulated carrier system, digital transmission system, multi-carrier system, etc., and can solve the problems of increasing computational complexity

Active Publication Date: 2011-12-14
卡莱汉系乐有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The known method therefore has the disadvantage that the time delay and transmission behavior of the detector must be known and requires increased computational complexity to determine the calibration values

Method used

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  • Calibrating amplitude and phase imbalance and DC offset of an analog i /q modulator in a high-frequency transmitter
  • Calibrating amplitude and phase imbalance and DC offset of an analog i /q modulator in a high-frequency transmitter
  • Calibrating amplitude and phase imbalance and DC offset of an analog i /q modulator in a high-frequency transmitter

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Embodiment Construction

[0053] The purpose of the present invention is to calibrate an analog I / Q modulator in a high frequency transmitter so as to achieve sufficiently high modulation accuracy and carrier suppression. This method does not require any equalization. This is achieved by means of special test signals and associated estimates. The method can utilize various sensors to estimate the transmitted high-frequency signal: for estimation, linear or nonlinear level indicators and I / Q demodulators can be used. In this case, the level indicator exhibits a strictly monotonic transfer characteristic between the input variable to be estimated (eg current power) and its output signal level.

[0054] figure 1 An I / Q modulator 1 is shown with a compensation circuit 2 as part of a transmitter (not shown here).

[0055] offset by DC E I ,E Q , Amplitude mismatch F A and phase mismatch F p to describe the fact that I / Q modulator 1 is not ideal. A compensation circuit 2 is connected upstream of the ...

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Abstract

The object of the invention, which relates to a method and an arrangement for calibrating an analog I / Q modulator in a high-frequency transmitter, is to provide a method and an associated circuit arrangement by means of which a calibration of the I / Q modulator is carried out without a balancing operation and thus the complexity is minimized. According to the invention, this object is achieved, in terms of the method, in that transmission signals are produced by the I / Q modulator in three method steps in accordance with the method and said transmission signals are in each case evaluated and the results of the evaluations are stored, in that, in a fourth method step, improved compensation coefficients are calculated on the basis of the results of the previous evaluations, which improved compensation coefficients can be used for a subsequent run-through of the method, and in that the run-throughs of the method are repeated until the error of the amplitude and / or phase response of the I / Q modulator lies below a defined threshold value or a defined number of run-throughs of the method is reached.

Description

technical field [0001] The invention relates to a method for calibrating an analog I / Q modulator in a high-frequency transmitter, wherein, prior to the I / Q modulation, in the in-phase path and in the quadrature-phase path by means of first and second compensation coefficients, respectively Weights the input signal and produces an output signal. [0002] The invention also relates to a device for calibrating an analog I / Q modulator in a high-frequency transmitter, having compensation means connected upstream of the analog I / Q modulator for correcting the amplitude and Phase imbalance. [0003] In communication engineering, to transmit information via radio, a transmitter employing an analog I / Q modulator is used to generate a transmission signal. [0004] Typically, there are special requirements for such transmitters with regard to modulation accuracy and carrier and sideband suppression of the I / Q modulator. Here, there is the problem that the amplification in the in-phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/36
CPCH04L27/364
Inventor 安德烈亚斯·白瑞
Owner 卡莱汉系乐有限公司
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