IQ signal calibration compensation method

A compensation method and signal technology, applied in the field of communication, can solve the problems of complex calculation process of blind calibration algorithm, complex calibration method, poor anti-interference ability, etc., so as to reduce logic complexity, simplify operation complexity, and increase stability. Effect

Active Publication Date: 2019-04-12
杭州城芯科技有限公司
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Problems solved by technology

[0005] The present invention solves the problems that the calculation process in the blind calibration algorithm is complex, the required logic resources are large, the calibration method is complicated, and the anti-interference ability is poor

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specific Embodiment approach

[0029] In order to solve the above problems, the present invention proposes a method for calibrating and compensating IQ signals, which is used for calibrating IQ signals of zero-IF receivers in wireless communication systems, figure 1 It is a schematic flow chart of the IQ signal calibration method provided by the technical solution of the present invention. figure 2 It is a schematic diagram of the principle of IQ signal calibration and compensation in the embodiment of the present invention. The method comprises the steps: (a) input calibration test signal to quadrature modulation (IQ) signal calibration predistortion module, calibration test signal comprises I road (in-phase) test signal X I And the Q way (orthogonal) test signal X Q ; (b) quadrature modulation (IQ) signal calibration predistortion module outputs compensation test signal (comprising I road compensation test signal Z by compensation calculation) I and Q compensation test signal Z Q ), the compensation c...

Embodiment 1

[0062] The preferred embodiments of the present invention will be described in detail below using specific data and parameters. The preferred embodiments described below are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0063] Set the digital frequency of the calibration test signal in step (a) to 1 / 8F S , and Gaussian white noise is added to the signal, the signal-to-noise ratio (SNR) is 30dB, the amplitude imbalance parameter α is 1.1, and the phase imbalance parameter 0.1rad, so that the received signal amplitude A = 1. Figure 4 is the time-domain image of the calibration test signal I and Q channels. Figure 5 is the complex spectrum of the received test signal. Figure 5 , the spectral line corresponding to the abscissa 0.25 represents the useful signal spectrum, and its spectral intensity is 28.26dB, and the spectral line corresponding to the abscissa 1.75 represents the image signal spectrum caused ...

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Abstract

The invention discloses an IQ signal calibration compensation method. The method comprises the steps of inputting calibration testing signals into an IQ signal calibration predistortion module; outputting compensated testing signals through compensation computing; inputting the compensated testing signals into an IQ signal calibration parameter estimation module, computing residual volume estimation of imbalance parameters, and outputting the residual volume estimation to an IQ signal calibration parameter iteration module; computing estimated values of iterated imbalance parameters by the IQsignal calibration parameter iteration module; updating the iterated imbalance parameters for compensation, thereby finishing single-time closed loop calibration; and terminating iteration if iteration times reaches the maximum iteration times, thereby finishing compensation. According to the method, closed loop iteration is carried out, complex computing such as extraction of a root and solutionof an inverse trigonometric function is avoided through utilization of an iteration approximation method, computing complexity of blind calibration is simplified, logic complexity of a digital circuitis reduced, under the same circuit area, computing count of the testing signals can be increased, compensation precision is improved, and moreover, through utilization of a closed loop system, stability under an interference condition is improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for calibrating and compensating an quadrature modulation (IQ) signal. Background technique [0002] As an emerging technology, software radio has been widely used in the field of radio communication, and has had a huge impact on the traditional radio field. Zero-IF receivers are often used in software radios, using a direct down-conversion structure. In this structure, the RF signal undergoes a quadrature down-conversion to the baseband frequency, and the baseband signal is obtained after passing through the digital filtering channel. However, due to factors such as process angle and device matching, the amplitude and phase of the I / Q two-way signal will appear Deviation, resulting in image frequency interference signal. [0003] At present, there are two main solutions to the IQ imbalance problem of zero-IF receivers in the industry. One is to optimize the anal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B1/16H04L27/36
CPCH04B1/1027H04B1/16H04L27/367
Inventor 杨润光王志宇刘家瑞陈华郁发新
Owner 杭州城芯科技有限公司
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