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This paper discuss the nonlinearity compensation techniques for the HF power amplifiers. The memory polynomial predistorter is utilized to pre-compensate the static nonlinearity and the memory effects of the HF power amplifier. The verification results for a practical HF power amplifier demonstrate that the memory polynomial predistorter can effectively suppress the spectrum regrowth caused by the...
This paper proposes a real-valued time-delay radial basis function (RVTDRBF) networks suitable for dynamic modeling of the baseband nonlinear behaviors of the multi-carrier multi-mode power amplifiers (MMPA). Parameters (weights and centers) of the proposed model are identified using the orthogonal least square (OLS) algorithm. In order to verify the model ability for modeling the nonlinearity of...
In this paper, a low-cost hardware implementation of a Look-up-Table(LUT) based digital predistorter (DPD) using Field Programmable Gate Array(FPGA) for power amplifier linearization is proposed. The LUT predistoter is implemented in Altera Stratix II DSP Development Board to simulate the inverse model for memoryless wide-band RF power amplifiers. The parameters of the LUT predistoter are identified...
In this paper, the dependence of the static nonlinear properties of the wideband RF power amplifiers on the applied signals has been discussed to illustrate the necessity to extract the static nonlinear properties in real time while applying the real modulated signal. A novel dynamic exponential weighted moving average method is proposed to extract the static nonlinear properties of the wideband RF...
In this paper, a novel Hammerstein-like predistortion technique is proposed to linearize the wideband wireless power amplifiers. This Hammerstein-like predistortion technique is based on a Hammerstein-like block configuration, including a memoryless strong nonlinear block followed by a dynamic weak nonlinear block. Here the memoryless strong nonlinear block is utilized to account for the static memoryless...
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