高移动无线通信抗多普勒效应技术研究进展

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

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.

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.