基于分数阶傅里叶域均衡的无线测控系统研究

摘要

The channel is time-frequency-dispersive due to considerable relative movement in the aerospace communication systems. A signal carrier modulation system with equalization based on the fractional Fourier transform is proposed for wireless test and control systems. The system can get better performance through selecting the optimal fractional order, and doesn't need the feed-back link. Theoretical analysis and numerical simulation results show that the system can significantly improve the performance of single carrier frequency domain equalization (SC-FDE) system.%在航天等具有较大相对运动的通信系统中，信道常具有时频双扩展特性。在此环境下，由于信道的时变性，传统的正交频分复用系统及单载波傅里叶域均衡系统的性能都大为下降。针对航天无线测控系统的高速传输，提出了一种基于分数阶傅里叶域均衡的单载波系统。该系统通过最优阶次的选择，能获得比传统方法更好的性能，而且接收机与发射机之间不需要建立反馈链路，使得应用更加灵活。仿真结果表明，与单载波傅里叶域均衡系统相比，该系统性能更好。