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Accurate modeling of power amplifiers (PA) is of upmost importance in the design process of wireless communication systems where a high linearity and efficiency is required. To deal with the nonlinear behavior of PAs effectively a linearization stage is applied to minimize the distortions of in-band and adjacent transmission channels, which translate to an improvement of the signal integrity and the...
This paper investigates the issues related to numerical stability and complexity of models for multi-carrier and carrier aggregated transmitted signal using wideband power amplifier and proposes independent component analysis (ICA) technique as a solution. It has been reported that ICA provides better numerical stability and lower dispersion of coefficients in established polynomial based models....
This paper presents an algorithm for the simultaneous linearization and cancellation of modulated harmonics of broadband power amplifiers (PA). The algorithm relies on a joint system identification of the nonlinearity, memory effects and group delay of both the main and harmonic cancellation channels using a recently reported cubic spline basis. The filter-less cancellation of the modulated harmonics...
In the concurrent dual-band digital predistortion (DPD), it is required that each band of interest be accurately measured, so that the in-band distortion can be modeled and suppressed. However when the two bands are closely spaced, the inter-band modulation by-products overlap with the cross-modulation and the in-band intermodulation, thus leading to linearization performance degradation. On the other...
Concurrent dual-band digital predistortion (DPD) is an interesting and popular approach for linearizing power amplifiers (PAs) driven by concurrent dual-band signals in wireless base stations and improving system efficiency. The predistorter kernel extraction requires accurate measurement of the output of PA. In order to observe each band of interest, an RF band-pass filter is placed before the down-converter...
This paper reports a new direct learning (DL) technique using 2D quasi exact inverse (2D-QEI) of a power amplifier (PA) model for linearizing concurrent dual band PA. In contrast to indirect learning (IL) architecture, where the coefficients are extracted by swapping the input and output signals in any PA model, a QEI of a PA model can be used in the digital predistorter (DPD). A 2D memory polynomial...
This paper presents a new architecture for frequency-selective digital predistortion (DPD) for two-band PA linearization. The algorithm used accounts for differential memory effects up to 5th order for bands which can be arbitrarily spaced. The preliminary demonstration study is performed using 2-band multi-tone signals with various tone spacing and band separation. The test signal and the linearization...
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