Multipath Fading with Large Doppler – Foe or Friend

Speaker: Prof. Guan Yong Liang

of.YongLiangGUAProf.YongLiangGUA

Venue: Room 215, College of Information Science & Electronic Engineering, Yuquan Campus

Abstract: High-mobility broadband communication channels tend to suffer from fast time-varying multipath fading with large Doppler spread, also known as doubly selective fading. Doubly selective fading becomes more severe when future communications move to higher frequency bands in the mm-wave or sub-THz range. Multipath fading introduces inter-symbol interference (ISI) in single-carrier communication systems, Doppler spread introduces inter-carrier interference (ICI) to multi-carrier communication. Tracking the fast- varying fading channel states also requires more pilot overhead, which cuts communication efficiency. On the other hand, multipath presents frequency diversity, while Doppler effects present time diversity, which are good against signal deep fades. In this talk, I will share recent results in constructing doppler-resilient multipath receivers with low pilot overhead, by exploiting BEM channel modelling, pseudo-pilot, iterative channel estimation and equalization, and other techniques, turning the foes in doubly selective fading channel to diversity benefits.