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IQ and 4-channel TIADC joint distortion blind estimation and correction method

A blind estimation and channel technology, applied in baseband systems, shaping networks in transmitters/receivers, digital transmission systems, etc., can solve the problem of limiting the impurity-free dynamic range of the system, the mismatch error between IQ and TIADC systems, and the impact of impurity-free dynamic range etc.

Active Publication Date: 2018-10-23
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] Generally, 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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  • IQ and 4-channel TIADC joint distortion blind estimation and correction method
  • IQ and 4-channel TIADC joint distortion blind estimation and correction method
  • IQ and 4-channel TIADC joint distortion blind estimation and correction method

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Embodiment 1

[0054] A method for joint distortion blind estimation and correction of IQ and 4-channel TIADC, comprising the following steps:

[0055] 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).

[0056] 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 not only can improve sampling numerical ratio and maintain high resolution, but also can digitalize the signal of the greater bandwidth. Due to the frequency response mismatch of an analog device, various stray components are produced in the added frequency band, and the spurious-free dynamic range of the system is limited. A mirror image pair is constructed for the distortion element through digital signal processing (DSP), the estimation and compensationare performed by using the cyclic mirror image frequency interference correction algorithm based on the second-order statistics without using any reference signal, the computation is simple, and the compensation effect is good.

Description

technical field [0001] The present invention relates to the field of wireless communication, and more specifically, relates to a blind estimation and correction method of IQ and 4-channel TIADC joint distortion. Background technique [0002] Analog-to-Digital Converters (ADCs) are a critical technology in many of today's applications, 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, in order to achieve high ...

Claims

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Application Information

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Patent Type & Authority Applications(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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