基于FPGA的OFDM系统设计与实现

正交频分复用（OFDM,Orthogonal Frequency Division Multiplexing）由于其抗多径衰落,频谱利用率高的优点在无线通信领域得到了广泛的应用。设计了一套基于现场可编程逻辑阵列（FPGA）的全数字OFDM系统,给出了系统方案以及关键技术的实现方法。在设计中同步采用基于循环前缀的联合同步算法,峰均功率比抑制采用加扰方法,信道估计采用最小二乘算法。此外,还采用了一种新的抗干扰技术,通过检测并切换子载波来达到抗干扰的目的。测试结果表明系统工作稳定,抗干扰性能良好。

Design and Implementation of OFDM System Based on FPGA

OFDM （orthogonal frequency division multiplexing） for its high frequency spectrum availability and robustness to multipath delay spread,is widely used in wireless communications.An all-digital OFDM system based on FPGA is designed,and the system scheme and implementation methods of the critical technology are given.The joint synchronization algorithm based on cyclic prefix is adopted for synchronization,the scrambling method for peak to average power ratio（PAPR）reduction,and the least square method for channel estimation.In addition,a novel technology is adopted,in which the anti-interference is accomplished by checking and switching subcarriers.The experiment results show that the system is reliable,and is of good anti-interference performance.