Impact of the propagation environment on the performance of space-frequency coded MIMO-OFDM


Helmut Bölcskei, Moritz Borgmann, and Arogyaswami J. Paulraj


IEEE Journal on Selected Areas in Communications, Vol. 21, No. 3, pp. 427-439, Apr. 2003.

DOI: 10.1109/JSAC.2003.809723

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Previous work on space-frequency coded 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.


MIMO, OFDM, space-frequency coding, spatial multiplexing, diversity, channel modeling

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