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In this paper, the results of dynamic load modulation on a high power amplifier is shown with experiments. A simple static nonlinear model is used as an inverse model, and by dynamically controlling both the input signal to the power amplifier and the load impedance, high efficiency operation of the power amplifier is achieved. The modulated measurements show the feasibility of dynamic load modulation...
This paper focuses on modeling and compensation of both linear and nonlinear distortions in RF I/Q modulators using a dual-input Volterra series-based modeling approach. Moreover, dual-input memory polynomial and dual-input dynamic deviation reduction-based Volterra series models are proposed. The proposed models are evaluated by digital pre-compensation of a high performance I/Q modulator with a...
In this paper, a nonlinear modeling approach is used to demonstrate a joint compensation scheme for the linear and nonlinear distortions in the I/Q modulator and the power amplifier. Based on this nonlinear model, a digital pre-compensator is constructed. The effects of these two most dominant nonlinear components in a modern transmitter can therefore be digitally pre-compensated in a single step...
Different adaptive filter algorithms are used for feedback cancellation in hearing aids. In this paper first, we will explain three different algorithms for feedback cancellation, which are robust against colored input signals. These algorithms are including the Approximated Affine Projection using Gram-Schmidt prediction, the Variable Step-size APA algorithm, and the QR-RLS algorithm. Then, we will...
The abdominal ECG is a composite signal because it contains both the mother's and the fetus' ECG signals, but the chest ECG is supposed to have only maternal (MECG) component. In this paper, we use three different adaptive algorithms to remove FECG signal from the abdominal ECG. All procedures are applied to real multichannel ECG recordings obtained from a pregnant woman. We explain and compare the...
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