Multi-tone analysis in nonlinear systems

Andrawes, A.

doi:10.1109/ictea.2012.6462912

Cited by 4 publications

(1 citation statement)

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“…ACLR is calculated from the output modulated signal using Fourier analysis [6]. In addition, analysis using multi-tone signals instead of adding modulated signals is also being studied [7]- [9]. On the other hand, in the proposed calculation method, first, the probability density function of the modulated signal is calculated in advance from the data string of the modulated waveform.…”

Section: Overview Of Proposed Calculation Methodsmentioning

confidence: 99%

Distortion Analysis of RF Power Amplifier Using Probability Density of Input Signal and AM-AM Characteristics

Tanaka

2022

IEICE Trans. Fundamentals

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When confirming the ACLR (adjacent channel leakage power ratio), which are representative indicators of distortion in the design of PA (power amplifier), it is well known how to calculate the AM-AM/PM characteristics of PA, input time series data of modulated signals, and analyze the output by Fourier analysis. In 5G (5th generation) mobile phones, not only QPSK (quadrature phase shift keying) modulation but also 16QAM (quadrature modulation), 64QAM, and 256QAM are becoming more multivalued as modulation signals. In addition, the modulation band may exceed 100 MHz, and the amount of time series data increases, and the increase in calculation time becomes a problem. In order to shorten the calculation time, calculating the total amount of distortion generated by PA from the probability density of the modulation signal and the AM (amplitude modulation)-AM/PM (phase modulation) characteristics of PA is considered. For the AM-AM characteristics of PA, in this paper, IMD3 (inter modulation distortion 3) obtained from probability density and IMD3 by Fourier analysis, which are often used so long, are compared. As a result, it was confirmed that the result of probability density analysis is similar to that of Fourier analysis, when the nonlinearity is somewhat small. In addition, the agreement between the proposed method and the conventional method was confirmed with an error of about 2.0 dB of ACLR using the modulation waves with a bandwidth of 5 MHz, RB (resource block) being 25, and QPSK modulation.

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Section: Overview Of Proposed Calculation Methodsmentioning

confidence: 99%