基于SC-FDE系统的数字预失真关键技术研究与实现

his paper focuses on the implementation of digital predistortion (DPD) in single-carrier frequency domain equalization (SC-FDE) to reduce the nonlinear distortion of the signal caused by the nonlinear characteristics of the power amplifier (PA). In order to study the digital predistortion technology in depth, it is necessary to understand and analyze the nonlinearity of the power amplifier. Then, the common polynomial predistortion scheme and the lookup table predistortion scheme are simulated and analyzed.According to the usage scenarios and simulation analysis results of this paper, and the complexity of the whole pre-distortion algorithm in FPGA implementation, this paper proposes an improved look-up table plus adaptive filter pre-distortion algorithm.The scheme takes into account the simple and easy to implement look-up table structure and the high precision of the polynomial model scheme and the fast tracking of the dynamic changes of the power amplifier, which improves the performance of the pre-distortion algorithm while reducing the implementation difficulty. The realization and simulation experiments of the digital predistortion algorithm of the power amplifier under laboratory conditions show that the system performance achieved is obviously improved and the design requirements are met.