摘要
在宽带无线通信系统中,高功率放大器HPA因其非线性和记忆特性,将会导致频谱再生和邻道干扰。本文论述了在FPGA硬件平台上实现基于Volterra级数间接学习型的预失真器,采用LMS自适应算法在线实时更新预失真器的权重系数,从而有效消除高功率放大器的非线性失真。实验结果表明,该设计可以有效降低功放的互调失真(IMD),进而提高发射机系统的性能。
In the wideband wireless communication systems, the nonlinearity of high power amplifier （ HPA memory causes spectral spreading and adjacent channel interference. This paper proposes Volterra_based ） with predistorter based on the indirect learning algorithm in the FPGA design, where weighted coefficients can be updated instantaneously by LMS adaptive algorithm and the nonlinear distorting of HPA can be eliminated efficiently. The result of experimentation shows that this design can reduce the IMD of HPA and improve the performance of transmitter systerns effectively.
出处
《中国集成电路》
2008年第10期47-51,共5页
China lntegrated Circuit
