Impact of the propagation environment on the performance of space-frequency coded MIMO-OFDM
Bolcskei, H.
Borgmann, M.
Paulraj, A.J.
Commun. Technol. Lab., ETH Zurich, Switzerland;
This paper appears in: Selected Areas in Communications, IEEE Journal on
Publication Date: Apr 2003
Volume: 21,
Issue: 3
On page(s): 427- 439
ISSN: 0733-8716
INSPEC Accession Number: 7570586
Digital Object Identifier: 10.1109/JSAC.2003.809723
Current Version Published: 2003-04-08
Abstract
Previous work on space-frequency coded multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) has been restricted to idealistic propagation conditions. In this paper, using a broadband MIMO channel model taking into account Ricean K-factor, transmit and receive angle spread, and antenna spacing, we study the impact of the propagation environment on the performance of space-frequency coded MIMO-OFDM. For a given space-frequency code, we quantify the achievable diversity order and coding gain as a function of the propagation parameters. We find that while the presence of spatial receive correlation affects all space-frequency codes equally, spatial fading correlation at the transmit array can result in widely varying performance losses. High-rate space-frequency codes such as spatial multiplexing are typically significantly more affected by transmit correlation than low-rate codes such as space-frequency block codes. We show that in the MIMO Ricean case the presence of frequency-selectivity typically results in improved performance compared to the frequency-flat case.
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