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采用改进型Hammerstein动态非线性模型来设计数字预失真器,用于矫正Doherty射频功放的动态非线性,从而获得一个适合于诸如WCDMA、CDMA2000和WiMAX这样的新型宽带无线通信系统的高效线性射频功率放大系统。文中使用频率间隔5MHz的两载波3GPP-FDD WCDMA信号作为测试信号,设计了一个16W峰值输出功率的L波段Doherty射频功率放大器。实验表明基于改进型Hammerstein动态非线性模型的数字预失真器可以很好地抑制Doherty射频功放的动态非线性引起的频谱再生,从而有效地降低了邻道干扰。
The improved Hammerstein dynamic nonlinear model was used to design a digital predistorter to correct the dynamic non-linearity of Doherty RF amplifiers and to achieve a highly efficient linear RF power amplification suitable for new broadband wireless communication systems such as WCDMA, CDMA2000 and WiMAX system. In this paper, a two-carrier 3GPP-FDD WCDMA signal with a frequency separation of 5MHz is used as a test signal to design a 16W L-band Doherty RF power amplifier with peak output power. Experiments show that the digital predistorter based on the improved Hammerstein dynamic nonlinear model can restrain the spectrum regeneration caused by the dynamic nonlinearity of Doherty RF power amplifier, thus effectively reducing the adjacent channel interference.