Abstract
In this paper, we consider the serial concatenation of linear time-varying (LTV) systems and its impact on the discrete-time modeling of wide-sense stationary uncorrelated scattering (WSSUS) fading channels. By deriving an expression for the composite impulse response of the overall concatenated system, we find that unlike the time-invariant case, the concatenation of LTV systems is not commutative, i. e., the order of arrangement affects the overall impulse response. This has significant impact when a digital transmission over a time-varying fading channel, which is an LTV channel, is represented by an equivalent discrete-time model that incorporates both transmitter and receiver filters. We further show that if the maximum Doppler frequency is much smaller than the system bandwidth, the concatenation of LTV systems is approximately commutative, then a convenient and efficient representation in the discrete-time domain for WSSUS fading channels is obtainable.
Recommended Citation
C. Sgraja and C. Xiao, "On Discrete-Time Modeling of Time-Varying WSSUS Fading Channels," Proceedings of the IEEE International Conference on Communications, 2006. ICC'06, Institute of Electrical and Electronics Engineers (IEEE), Jan 2006.
The definitive version is available at https://doi.org/10.1109/ICC.2006.255534
Meeting Name
IEEE International Conference on Communications, 2006. ICC'06
Department(s)
Electrical and Computer Engineering
Sponsor(s)
National Science Foundation (U.S.)
University of Missouri--Columbia Research Council
Keywords and Phrases
Digital Transmission; Discrete-Time Modeling; Linear Time-Varying (LTV) Systems; Wide-Sense Stationary Uncorrelated Scattering
Document Type
Article - Conference proceedings
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2006 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
01 Jan 2006
