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在短波通信中,高速数据传输要求使用高效的线性调制技术,由于放大器固有的非线性特性,会产生频谱再生,造成邻道干扰,严重影响通信系统的性能。为补偿短波功率放大器的非线性失真,文中提出了一种基于查找表的基带数字预失真方法。该方法通过训练序列采用割线法获得复增益查找表,与普通自适应查找表预失真器相比,该预失真器可以离线处理失真数据,避免LUT的实时自适应更新,降低了对系统实时性的要求。仿真结果表明,该预失真器能够有效地改善功放的线性度,降低频谱再生。
In short-wave communications, high-speed data transmission requires the use of efficient linear modulation techniques. Due to the inherent nonlinearity of the amplifier, spectrum regeneration occurs, causing adjacent channel interference and seriously affecting the performance of the communications system. In order to compensate the nonlinear distortion of the short-wave power amplifier, a digital baseband predistortion method based on look-up table is proposed. The method uses the secant method to obtain the complex gain look-up table through the training sequence. Compared with the conventional adaptive look-up table predistorter, the predistorter can process the distortion data off-line and avoid the real-time adaptive update of the LUT, Sexual requirements. The simulation results show that the predistorter can effectively improve the linearity of the amplifier and reduce the spectrum regeneration.