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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。
Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing) Because of its anti-multipath fading, the advantages of high spectral efficiency have been widely used in the field of wireless communications. An all-digital OFDM system based on Field Programmable Logic Array (FPGA) is designed. The realization of the system scheme and the key technologies are given. Synchronization in the design using cyclic prefix-based joint synchronization algorithm, peak-to-average power ratio suppression using scrambling method, channel estimation using least-squares algorithm. In addition, also adopted a new anti-jamming technology, by detecting and switching subcarriers to achieve the purpose of anti-jamming. Test results show that the system is stable and anti-jamming performance is good.