适用于宽带航空通信系统的大频偏纠正传输方案

摘要

This paper established a new wideband aeronautical communication channel model. Firstly it analyzed the characters of none line of sight, navigation scenarios and proposed a large frequency offset correction scheme which was based on Turbo codes combined with SC-FDE( single-carrier frequency domain equalization) and two frequency offset estimation . Theoretical analysis and simulation results show that the new scheme has a strong ability to adapt to the rapidly time-varying channel, and in the En-Route scene, it can easily correct the phase rotation and fuzzy problems. Under the none line of sight condition, the BER of the new scheme can reach to 10-3, so it improves the bit error rate ability and enhances the reliability of the information transmission.%建立了新的宽带航空无线信道模型,分析了无视距、航行场景下的信道特性,提出了一种Turbo码与单载波频域均衡(SC-FDE)相结合,采用二次频偏估计的大频偏纠正系统方案.理论分析和仿真实验结果表明,新方案可以很好地适应宽带航空信道的时变特性,在低信噪比条件下及航行场景下,新系统明显优于传统的SC-FDE系统,很好地纠正了星座图的相位旋转和模糊问题；无视距情况下,相比于传统的SC-FDE系统,新方案可以使误码率达到10-3,使系统的误码率有明显的提高,从而提高系统传输的可靠性.