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A joint blind estimation and correction method of iq and 4-channel tiadc distortion

A blind estimation and channel technology, applied in digital transmission systems, baseband system components, baseband systems, etc., can solve problems such as reducing the system signal-to-noise ratio, IQ and TIADC system mismatch errors, and breaking the loop signal cycle, etc., to achieve Improve the sampling rate, good compensation effect, simple calculation effect

Active Publication Date: 2022-05-17
SYSU CMU SHUNDE INT JOINT RES INST +1
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AI Technical Summary

Problems solved by technology

Due to the inherent shortcomings of the manufacturing process itself, each ADC cannot be exactly the same, and the I branch and the Q branch cannot be exactly the same, so there will inevitably be a mismatch error between the IQ and TIADC systems, which seriously affects the impurity-free dynamic range of the system. (SFDR) and reduces the overall system signal-to-noise ratio
[0004] Usually, the communication complex signal in the receiver has a cyclic characteristic, but the mismatched IQ and TIADC break the cyclicity of the signal, so that there are other frequency components in the actual output signal, which limits the impurity-free dynamic range of the system

Method used

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  • A joint blind estimation and correction method of iq and 4-channel tiadc distortion
  • A joint blind estimation and correction method of iq and 4-channel tiadc distortion
  • A joint blind estimation and correction method of iq and 4-channel tiadc distortion

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Embodiment 1

[0052] A method for joint distortion blind estimation and correction of IQ and 4-channel TIADC, comprising the following steps:

[0053] 1. by figure 1 It can be seen that let the receiver signal x RF (t) Sampling is performed through the 4TIADC system after I / Q down-conversion, and the sampling period is N=4. The bandwidth of x(n) is limited to pi. x RF (t) Output x after I / Q down-conversion I (t) and x Q (t), the output after 4TIADC is x 4I (t) and x 4Q (t), then the total output of the system is x 4 (t)=x 4I (t)+jx 4Q (t). Among them, the impulse response of the down-conversion I branch is g I (t), the impulse response of the down-conversion Q branch is g Q (t), the impulse response of the 8 ADCs is g 0 (t), g 1 (t), g 2 (t), g 3 (t), g 4 (t), g 5 (t), g 6 (t), g 7 (t).

[0054] 2. For the output signal X 4 The first Nyquist zone analysis of (jΩ) spectrum found that there are 8 kinds of spectrum, which are K 0 (jΩ), K 1 (jΩ), K 2 (jΩ), K 3 (jΩ), K...

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Abstract

The invention provides an IQ and 4-channel TIADC joint distortion blind estimation and correction method. The IQ joint multi-channel TIADC of the invention can not only improve the sampling rate and maintain high resolution, but also digitize signals with larger bandwidths. However, due to the frequency response mismatch of analog devices, various spurious components are generated in the increased frequency band, which limits the system's spurious-free dynamic range (SFDR). The present invention constructs image pairs for distortion components through digital signal processing (DSP), and then uses a cyclic image frequency interference correction algorithm based on second-order statistics to estimate and compensate without any reference signal, simple calculation, and good compensation effect.

Description

technical field [0001] The present invention relates to the field of wireless communication, and more specifically, relates to a joint blind estimation and correction method of IQ and 4-channel TIADC distortion. Background technique [0002] Analog-to-Digital Converters (ADCs) are critical technologies in many applications today, such as wireless communications, radar, and electronic warfare. Because digital signal processing provides greater flexibility, computing power, reproducibility, speed and accuracy than analog signal processing. The common trend of these systems is to require higher data rate, larger processing bandwidth (BW) and higher resolution. However, the resolution and sampling rate of the ADC are a pair of contradictions. The highest resolution is limited by its sampling rate. High resolution requires a long conversion time, while high sampling rate requires a short conversion time. According to the current IC design process, to achieve high resolution and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03H04B1/10
CPCH04B1/10H04B1/1027H04L25/0218H04L25/0238H04L25/03159
Inventor 李宇王江妹谭洪舟
Owner SYSU CMU SHUNDE INT JOINT RES INST
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