高移动无线通信抗多普勒效应技术研究进展

车辆高速移动所产生的多普勒效应,对于高铁等高移动场景下的宽带无线通信具有极大的危害性,严重影响无线通信系统的可靠性和容量.本文系统地讨论了3类抗多普勒效应应对技术,即多普勒规划、多普勒补偿和多普勒利用,给出了作者在多普勒利用方面的最新研究进展:对于多普勒规划,主要通过系统初始设计在一定程度上降低多普勒效应的危害;对于多普勒补偿,必须准确估计多普勒频偏从而进行补偿或抵消,以大幅减小多普勒效应的影响;对于多普勒利用,应设法运用多普勒效应,化废为宝,挖掘时变信道提供的潜在多普勒分集增益. 

Advances in Anti-Doppler Effect Techniques for High Mobility Wireless Communications

Doppler effect arising during a fast moving vehicle is very harmful to the wireless communications systems in high-speed trains and similar high mobility scenarios, affecting significantly the communication reliability and capacity. In this work, three categories of anti-Doppler effect techniques were analyzed, i.e., Doppler planning, Doppler compensation and Doppler utilization, especially the authors' recent work in Doppler utilization. In Doppler planning, the initial system design should ensure that the Doppler effect is reduced to a certain degree; in Doppler compensation, the Doppler offset should be firstly estimated accurately; then it can be greatly compensated or even canceled; as for Doppler utilization, it aims at collecting the potential Doppler diversity gains inherent in the time-varying channels, thus turning interference into assets.