基于FPGA的非线性校正设计方案

Project of the Hardware based on DRM Nonlinear Predistortion

OFDM非线性校正技术是现代通信系统广泛采用的调制方式,但其信号具有较高的信号峰均比而导致功率放大器HPA的非线性失真较为严重。本文简单介绍了常用的非线性校正方法,重点针对现有的方法本文提出了采用了基于FPGA非线性校正方案的实现。本方案具有集成度高、灵活性强、收敛速度快等优点。这种硬件实现方案在DAB小功率实验发射系统中进行了实测并取得了较好的非线性校正效果。

As one high speed data transmitting technology, the OFDM has lots of advantages. One disadvantage of multi-cartier systems is that the high peak-to-average-power ratio of OFDM is easy to result in nonlinearity for HPA（high power amplifier）. This paper introduces the way to suppress the nonliearity of HPA. More important, the paper gives us some technology of nonlinear predistortion based on FPGA. These projects had got relative good result through applying it to a smallpower transmitting system.