Paper Info
Title
Impact of mobility and CSI on performance of OFDM systems
Abstract
This paper is concerned with the orthogonal frequency division multiplexing (OFDM) systems in high-mobility scenarios, where the wireless channels are modeled as rapidly time-varying (TV) fading channels. To analyze the effect of the mobility on the performance, we derive lower bounds on the capacity of the systems. With Jakes' model, the derived lower bounds depend on both the velocity and the channel state information (CSI). Numerical results reveal two factors that degrade the performance. One is the terminal mobility, and the other is the channel estimation error (tending to be more severe due to the high mobility). When CSI is perfect, the capacity changes very little with the increasing of mobility in the low signal to noise ratio (SNR) region, but has a significant loss in the high SNR region. When CSI is imperfect, improving the accuracy of channel estimation will increase the capacity significantly. We also design block Markov superposition transmission (BMST) codes for the OFDM systems in the high-mobility scenarios. Simulation results coincide with the capacity analysis.
Year
DOI
Venue
2016
10.1109/ICCS.2016.7833612
2016 IEEE International Conference on Communication Systems (ICCS)
Keywords
Field
DocType
Capacity bounds,high mobility,orthogonal frequency division multiplexing (OFDM),rapidly time-varying channel
Superposition principle,Mathematical optimization,Wireless,Computer science,Fading,Markov chain,Signal-to-noise ratio,Communication channel,Electronic engineering,Electrical engineering,Orthogonal frequency-division multiplexing,Channel state information
Conference
ISBN
Citations 
PageRank 
978-1-5090-3424-6
0
0.34
References 
Authors
14
3
Name
Order
Citations
PageRank
Yunhong Zhang100.68
Lei Lin262.90
Xiao Ma348764.77