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现代无线通信系统所采用的高效的数字传输技术造成射频端信号非恒包络化;同时高速数据传输要求更高的信噪比,这些都对功率放大器线性特性提出更高要求。文章对一种基于改进最小均方算法的多项式预失真补偿技术进行研究。该算法在传统最小均方算法中引入先验信息,在保证低复杂度的前提下大大提高了最小均方算法收敛速率。同时,将改进后的多项式预失真技术应用于功放线性化设计中,并进行了仿真,仿真结果显示应用改进最小均方算法的多项式预失真器对功放失真抑制效果明显。
The high efficiency of digital transmission technology used in modern wireless communication systems results in non-constant enveloping of the RF signal. Meanwhile, high-speed data transmission requires higher signal-to-noise ratio, which puts higher demands on the linearity of the power amplifier. A polynomial predistortion compensation technique based on improved least mean square algorithm is studied in this paper. The algorithm introduces prior information into the traditional Least Mean Square algorithm, which greatly improves the convergence rate of Least Mean Square algorithm under the premise of ensuring low complexity. At the same time, the improved polynomial predistortion technique is applied to the linearization design of the power amplifier, and the simulation results show that the polynomial predistorter with the improved least mean square algorithm can effectively suppress the distortion of the power amplifier.