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A method of correcting i/q imbalance based on simulated annealing algorithm

A simulated annealing algorithm and balance correction technology, applied in the fields of radio frequency communication and digital signal processing, to achieve the effect of improving performance, accuracy and efficiency

Active Publication Date: 2020-04-28
ZHEJIANG UNIV
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This calibration method requires auxiliary calibration equipment

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  • A method of correcting i/q imbalance based on simulated annealing algorithm
  • A method of correcting i/q imbalance based on simulated annealing algorithm
  • A method of correcting i/q imbalance based on simulated annealing algorithm

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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0026] Such as figure 1 As shown, an embodiment of the present invention provides a method for correcting the imbalance between the in-phase component and the quadrature component of the modulated signal of the transmitter. The signals used for correction include three types of signals, and the three types of signals are: The phase error θ of the I-channel signal relative to the Q-channel signal, the amplitude A of the I-channel signal, and the amplitude B of the Q-channel signal. The I road signal is the in-phase component of the modulated signal of the transmitter, an...

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Abstract

The invention discloses an I / Q imbalance correction method based on a simulated annealing algorithm. The method comprises the following steps: (1) generating I paths of digital baseband signals I andQ paths of digital baseband signals Q, which are orthogonal to each other, by using a Cordic signal generator; (2) performing I / Q amplitude pre-correction, I / Q phase pre-correction, DAC digital-to-analog conversion, low-pass filtering and up-mixing processing on the I signals and the Q signals in sequence, and merging the processed I signals and the Q signals to obtain a merged signal; (3) performing down-mixing, low-pass filtering, ADC analog-to-digital conversion, self-square calculation, and integral jittering on the merged signal in sequence to obtain an imbalance degree signal; (4) adjusting the I signals, the Q signals and the phase error theta of the I paths of signals relative to the Q paths of signals, so that the value of the imbalance degree signal approaches to 0; and (5) circularly executing the steps (1) to (5) until the simulated annealing algorithm is satisfied to complete search iteration conditions.

Description

technical field [0001] The invention relates to the fields of radio frequency communication and digital signal processing, in particular to a method and a device for self-correcting the signal imbalance characteristics of in-phase I and quadrature Q modulation by using an analog annealing algorithm in a zero-IF transmitter. Background technique [0002] In the design of a new generation micro-satellite radio frequency monolithic integrated transponder, in order to further compress the volume and reduce power consumption, the analog baseband and radio frequency processing are generally completed by a highly integrated software radio platform chip. Due to the limitations of the analog devices, in the transmission chain, the original orthogonal I / Q signals do not necessarily have a 90° phase shift, and the amplitude gains of the I / Q channels are not exactly the same. Although high-performance analog devices can fundamentally suppress the impact of I / Q imbalance, these devices a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/00
CPCH04L25/03878H04L27/0014H04L2027/002H04L2027/0026
Inventor 黄家骏张朝杰王春晖
Owner ZHEJIANG UNIV