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Method and system for correcting IQ and TIADC joint frequency distortion

A frequency distortion and frequency technology, applied in the field of analog-to-digital conversion, can solve problems such as image frequency interference and achieve good compensation effects

Active Publication Date: 2017-02-01
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Furthermore, the communication composite signal in the receiver has cyclic characteristics, but the mismatched IQ and TIADC break the cyclicity of the signal, so that there are conjugate components of the ideal signal in the actual output signal, resulting in image frequency interference

Method used

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  • Method and system for correcting IQ and TIADC joint frequency distortion
  • Method and system for correcting IQ and TIADC joint frequency distortion
  • Method and system for correcting IQ and TIADC joint frequency distortion

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Embodiment 1

[0040] Such as figure 1 as shown, figure 1 It is a schematic diagram of the structure of the down-conversion and time-interleaved analog-to-digital converter (IQ-TIC). The input signal enters the I branch and the Q branch respectively, and then enters the 2-channel TIADCs after being output by the I branch and the Q branch. Each channel uses the same The high-speed input signal is sampled at different sampling times (difference time between adjacent channels), and the output signal is finally combined to realize the analog-to-digital conversion of signal down-conversion and high-speed sampling.

[0041] Among them, x(n) outputs x after I / Q down-conversion I (n) and x Q (n), the output after TIADC is x 2I (n) and x 2Q (n), then the total output of the system is x 2 (n)=x 2I (n)+x2Q (n).

[0042] For output signal x 2 (n) The analysis of the first Nyquist zone of the spectrum found that there are four kinds of spectrum, which are the ideal components of linear distortion...

Embodiment 2

[0052] In this embodiment, a specific experiment has been carried out according to the method of embodiment 1. The frequency spectrum position of the receiver input signal used in the experiment is -0.3, 0.3, specifically as Figure 9 mentioned. The frequency used for down-conversion is 0.5pi, and the sampling frequency of TIADC is N=2. Such as Figure 10 As shown, there are four kinds of frequency components in the output signal of the IQ-TIC structure, and the spectral positions (normalized frequency) are -0.8, -0.2, 0.2, 0.8 respectively, which are respectively located at the image distortion position of TIADC and the ideal linear distortion position Component position, IQ distortion position, TIADC distortion position. Figure 11 , Figure 12 , Figure 13 They are the modified spectrograms of TIADC distortion, IQ distortion and TIADC image distortion respectively. Depend on Figure 11 , Figure 12 , Figure 13 It can be seen that after the correction method is corr...

Embodiment 3

[0055] On the basis of Embodiment 1, the present invention provides a system applying the method of Embodiment 1, the structure of the system is as follows figure 1 As shown, it includes an interleaving distortion correction module, an IQ distortion correction module and an interleaving image distortion correction module, wherein the interleaving distortion correction module corrects TIADC frequency distortion based on the method of step (1); the IQ distortion correction module is based on the method of step (2) The IQ frequency distortion is corrected; the interleaved image distortion correction module corrects the TIADC image distortion based on the method in step (3).

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Abstract

The invention discloses a method for adaptively correcting IQ (in-phase / quadrature) and Time Interleaved Analog-to-Digital Converter (TIADC) joint frequency distortion. A very extensive instantaneous radio frequency bandwidth can be digitalized by the joint IQ and TIADC, but because of the mismatch of an analog device, a distortion component is generated in a receiver, thereby limiting a Spurious Free Dynamic Range (SFDR) of the system. Generally, a composite communication signal has circularity (circularity), while the frequency distortion of the IQ and the TIADC destroys the circularity of the signal, the joint frequency distortion of an IQ and Time Interleaved Converter (IQ-TIC) in the receiver can be corrected by the method acquired according to principles related to a convolution method without using any reference signal, and thus the compensation effect is good.

Description

technical field [0001] The present invention relates to the field of analog-to-digital conversion, and more specifically, to an adaptive correction method and system for combined IQ and TIADC frequency distortion. Background technique [0002] The field of wireless communication requires wireless broadband systems to have the characteristics of high speed, high integration density and low cost efficiency. With the promotion of digital technology, these systems widely use analog-to-digital converters to digitize analog signals, and the requirements for ADC modules are getting higher and higher. In the prior art, an ADC module generally consists of a track-and-hold circuit and a quantizer. The track-and-hold circuit determines the analog bandwidth of the ADC module, and the quantizer determines the digital bandwidth of the ADC module. A high-speed wireless broadband system requires a high-bandwidth ADC module, and an important method to increase the digital bandwidth of the ...

Claims

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Application Information

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IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 谭洪舟王江妹李宇蔡彬
Owner SYSU CMU SHUNDE INT JOINT RES INST
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