Second-order Passive Intermodulation Distortion Modeling Using a Quadratic Volterra Filter for Wireless Relay Systems

Song, Jinzi; Kim, Bobae; Jin, Zhipeng; Im, Sungbin

doi:10.1109/ictc49870.2020.9289348

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…Based on the non-linear mathematical model of Equation (7) and the assumed input signal of Equation ( 8), a series of numerical simulations and calculations were performed. The non-linear functions with and without quadratic terms are calculated, respectively, to obtain the influence of quadratic terms on the predicted IM3 power.…”

Section: Theoretical Analysis On the Second-order Term-included Trans...mentioning

confidence: 99%

“…Therefore, for the multiple nonlinearities cascaded system, the second-order effect model needs to be explored. Song et al [7] proposed a secondorder PIM distortion estimation algorithm for the relays in the cellular communication system, effectively simulating the second-order PIMDI. Chehrazi et al [8] derived the second-order IM generation mechanism, accurately predicting the input second-order intercept point of the currentdriven passive mixer.…”

Section: Introductionmentioning

confidence: 99%

“…Song et al. [7] proposed a second‐order PIM distortion estimation algorithm for the relays in the cellular communication system, effectively simulating the second‐order PIMDI. Chehrazi et al.…”

Section: Introductionmentioning

confidence: 99%

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Effect of second harmonic and second‐order intermodulation on third‐order passive intermodulation

Jin

Feng

2021

IET Microwaves Antenna & Prop

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Third-order intermodulation (IM3) is considered as a typical metric to evaluate passive intermodulation (PIM) in electrical connectors, which may be affected by the second-order effect in the circuit with cascaded non-linearities. In this study, the effects of second harmonics and second-order intermodulation on the IM3 powers were theoretically modelled and experimentally verified. Combined with mathematical modelling, an equivalent circuit model of a passive non-linear source was presented to investigate the effect of second-order signals on the IM3 powers. A modified non-linear transfer function was developed by considering multiple non-linear superpositions in cascaded non-linearities. Based on the designed two-tone test, a mathematical expression was provided with the determination of correlation model coefficients. Numerical simulations were performed by using the proposed model, demonstrating the effect of signals induced by the second-order non-linearity on the IM3 powers in series passive components. The IM3 powers resulting from cascaded connectors associated with different signal frequencies were predicted. Coaxial connector samples were designed as cascaded PIM sources in circuits, which were experimentally measured in a GSM 900 MHz frequency band. Good agreement was obtained between the predictions and measurements with error of 0.76 dB in average.

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Section: Theoretical Analysis On the Second-order Term-included Trans...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%