Ultra-wide-band complex-format vector modulation error correction method based on two-stage predistortion

A technology of vector modulation and error correction, which is applied in the direction of modulation, modulation of electromagnetic waves, and modulation of carrier systems, etc. It can solve the problems of large modulation bandwidth signal distortion, inability to effectively correct broadband modulation errors, and does not consider the amplitude, phase and frequency response of errors, etc., to achieve saving The effect of simulating the correction circuit, eliminating hidden dangers of individual differences, and improving the accuracy of error correction

CN106534038AActive Publication Date: 2017-03-22CHINA ELECTRONIS TECH INSTR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-03-22

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Abstract

The invention provides an ultra-wide-band complex-format vector modulation error correction method based on two-stage predistortion. A loop comprises a standard signal generation module, a first-stage predistortion error compensator, a second-stage predistortion error compensator, an origin offset compensator, a transmission channel and a vector modulator; the first-stage predistortion error compensator offsets an amplitude-phase frequency response fluctuating feature of a broadband vector modulator error reversely in a molded filter predistortion manner; the second-stage predistortion error compensator corrects a modulation error, with the broadband feature, after first-stage predistorion balancing in the whole work waveband, namely, the positive-angle error with I / Q gain imbalance and gain imbalance; and the origin offset compensator corrects a modulation error with a narrowband feature, namely carrier wave leakage, via an analog device. According to the invention, the vector modulation error with the broadband feature is corrected in a digital predistortion manner, and the broadband complex-format vector modulation error is corrected effectively.
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Description

technical field

[0001] The invention relates to the technical field of testing, in particular to an ultra-wideband complex format vector modulation error correction method based on dual-stage predistortion. Background technique

[0002] The signals generated by the vector modulation function of the vector signal generator are mainly divided into two types, multi-tone modulation signals and complex modulation signals (such as QPSK, FSK, QAM, etc.). The I / Q vector modulator is a key component to realize vector modulation, and its performance has been significantly improved after years of development. Nevertheless, the modulation error of current mainstream I / Q vector modulators is still obvious and cannot be ignored. Especially under the condition of large modulation bandwidth, the magnitude and phase frequency response characteristics of vector modulation errors fluctuate significantly, and multiple modulation errors overlap and couple at each frequency point, which makes hi...

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Embodiment Construction

[0072] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0073] The electromagnetic signals used by various high-end frequency-using equipments present a rapid development trend of broadband and complexity. One of the core determinants of its development is the leapfrog improvement of complex vector modulation accuracy under the condition of large modulation bandwidth. The current high-end vector signal generator products all have broadband vector modulation function. However, due to the lag in the development of bro...