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OFDM技术具有传输效率高和有效对抗多径衰落的优点,已经成为无线局域网标准的一部分。但OFDM信号有较大的峰值平均功率比,要求功率放大器具有很大的线性动态范围,否则直接影响着整个系统的运行成本和效率。针对固态功率放大器,提出了一种改进的基于查找表的自适应预失真方案。仿真结果表明,该方案有效地抑制了谐波分量和互调失真,对HPA的非线性有一定的改善,并且有效利用了硬件存储资源和提高了硬件运行速度。
OFDM technology has the advantages of high transmission efficiency and effective against multipath fading, and has become a part of the wireless LAN standard. However, the OFDM signal has a large peak-to-average power ratio, requiring the PA to have a large linear dynamic range, otherwise it directly affects the operation cost and efficiency of the entire system. For the solid state power amplifier, an improved look-up table-based adaptive predistortion scheme is proposed. The simulation results show that this scheme can effectively restrain harmonic components and intermodulation distortion, improve the nonlinearity of HPA, and make effective use of hardware storage resources and speed up the hardware operation.