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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...
In this paper, a new method of suppressing the third order intermodulation distortion in directly modulated lasers by RF predistortion has been presented. In our scheme, the predistortion circuit is designed in an RF design tool — Advanced Design System (ADS), then we use the co-simulation between ADS and Optisystem for validation the effectiveness of the design. Using this scheme, we achieved the...
Wideband wireless transmitters will exhibit strong memory effects which heavily compromise the linearization performance of traditional memoryless predistorters. In this paper, the nonlinear behaviors of a wideband wireless transmitter are analyzed. According to the nonlinearity analysis, a novel memory effect separation based linearization technique is presented to linearize the wideband wireless...
In this paper, FPGA implementation of augmented Hammerstein predistorters for linearizing wideband RF power amplifiers with memory effects is presented. The augmented Hammerstein nonlinear model based predistorter is briefly introduced. The implementation method of the augmented Hammerstein predistortion on FPGA is described in details. The experimental platform based on Agilent vector signal generators...
In this paper, the concept of linear and nonlinear memory effects are proposed to explore the internal mechanism of the memory effects. The identification procedure of the linear and nonlinear memory effects is discussed in details. Finally the experimental validation results demonstrate that the nonlinear memory effects are significant for wideband RF power amplifier and cannot be ignored.
In this paper, an accurate validation method for dynamic nonlinear behavioral models of wideband RF high power amplifiers is presented. This method is an indirect validation approach which is based on memoryless predistortion technique to remove the out-of-band spectrum regrowth caused by static memoryless nonlinearities of the power amplifiers. The effectiveness of the model validation method is...
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...
In this paper, a spectral method based on the memoryless predistortion technique is presented to identify accurately the memory effects of wideband RF power amplifiers stimulated by practical modulated signals. According to this new definition of the memory effects, a novel metric to measure quantitatively the memory effects in wideband power amplifiers is proposed. With the proposed memory effect...
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