The Impact of Doppler Spreading on Delay Performance over Multi-hop Wireless Communications

Multi-hop wireless communications are very promising technologies to provide high data rate transmission through wireless link in multi-hop networks. Packets transmitted over wireless link will go through a time-varying wireless channel resulting in queuing delay. For delay-sensitive applications it is very important and challenging to study end-to-end delay performance over multi-hop wireless transmission. In this paper, we study the impact of Doppler spreading on delay performance over multi-hop wireless communications. Delay performance with different Doppler spreading are compared and discussed under different traffic load conditions. It is found that end-to-end delay performance is better for larger maximum Doppler spectrum under wireless channel without decoding errors compared with that for smaller maximum Doppler spectrum.