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A Compensation Method for I/Q Imbalance Phase Error Based on fpa

A phase error and compensation method technology, applied in the phase angle between voltage and current, instruments, spectrum analysis, etc., can solve the problems of incomplete image signal attenuation, error, etc.

Active Publication Date: 2021-05-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual situations, the errors of the used devices, circuit design, PCB layout, and the difference in the frequency response of the low-pass filter of the I road and the Q road will cause the signals of the I road and the Q road signals to have amplitude and phase mismatch I / Q imbalance can cause incomplete image signal attenuation and increase the bit error rate of baseband signal processing

Method used

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  • A Compensation Method for I/Q Imbalance Phase Error Based on fpa
  • A Compensation Method for I/Q Imbalance Phase Error Based on fpa
  • A Compensation Method for I/Q Imbalance Phase Error Based on fpa

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Embodiment

[0045] figure 1 It is a flow chart of the FPA-based I / Q imbalance phase error compensation method of the present invention.

[0046] In this example, if figure 1 As shown, a kind of FPA-based I / Q imbalance phase error compensation method of the present invention mainly includes three stages of S1-S3:

[0047] S1. Obtain the I / Q imbalance phase error to be compensated by inputting a monotone frequency sweep signal;

[0048] Assuming that there is no amplitude imbalance error in the path, the I / Q imbalance model is as follows figure 2 shown in the dotted box. ω LO =2πf LO is the angular frequency of the local oscillator signal, is the phase difference between the two local oscillator signals, independent of frequency. The frequency-dependent part of the phase error is caused by frequency response differences introduced by different components between the I / Q paths, denoted as φ(ω). The low-pass filter LPF is used to eliminate high-frequency components, and the analog-t...

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Abstract

The invention discloses an I / Q imbalance phase error compensation method based on FPA. First, the I / Q imbalance phase error θ(ω) to be compensated is obtained by inputting a continuous single-tone frequency sweep signal, and then the phase error θ(ω) is obtained based on the imbalance phase error θ( ω), using FPA to design the I / Q imbalance phase compensation module, the design of the I / Q imbalance phase compensation module is equivalent to a nonlinear optimization problem, and then using FPA to calculate the solution of the nonlinear optimization problem to obtain the optimal compensation module Finally, use the designed I / Q imbalance phase compensation module to perform I / Q phase error compensation.

Description

technical field [0001] The invention belongs to the technical field of error correction, and more specifically relates to an FPA-based I / Q imbalance phase error compensation method. Background technique [0002] The choice of the front-end architecture greatly affects the integration and flexibility of the receiver. The zero-IF structure has been favored in the past ten years because of its advantages of easy monolithic integration, simple structure, and low cost and power consumption. However, this architecture uses in-phase and quadrature (I / Q) mixing and is particularly sensitive to I / Q imbalance. Ideally, the I and Q signals should have a precise 90° phase difference and equal amplitude. However, in actual situations, the errors of the used devices, circuit design, PCB layout, and the difference in the frequency response of the low-pass filter of the I road and the Q road will cause the signals of the I road and the Q road signals to have amplitude and phase mismatch I / ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00G01R23/165
CPCG01R23/165G01R25/00
Inventor 孟婕曾浩郭连平叶芃赵禹
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA