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Proceedings Paper

New space-time-frequency codes for MIMO-OFDM systems in fast fading channel
Author(s): Gang Wu; Lei Zhang; You-Xi Tang; Shao-Qian Li; Yu Wang
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Paper Abstract

Time-selectivity in fast fading channels has been one of big obstacles to attain high efficiency and diversity gain for space-times codes. Orthogonal-frequency-division-multiplexing (OFDM) combined with space-time trellis codes has been introduced to combat effect of frequency-selectivity. Subsequently, space-time block codes, space-frequency codes and concatenation with diverse error-correcting codes were investigated. However, for multiple-input multiple-out (MIMO) OFDM systems, to design high-efficiency robust space-time-frequency codes becomes one of big problems. In this paper, we presented pairwise error probability analysis of space-frequency-time block codes, and then concluded one general design criterion for space-time-frequency block codes by utilizing the frequency-correlation feature of sub-channel in mobile OFDM systems. Then, we investigated performance of space-frequency block codes for MIMO-OFDM systems with 4 transmit antennas. And comparison between space-frequency block codes and space-time block codes is performed with different number of transmit antenna. Link-level simulations on COSSAP® verified analytical results. The results show that SFBC is superior to STBC in fast fading channel. And power-delay profile of fading channel, i.e., channel order and delay spread, must be included into design consideration on space-time-frequency codes.

Paper Details

Date Published: 8 August 2003
PDF: 11 pages
Proc. SPIE 5245, Internet Quality of Service, (8 August 2003); doi: 10.1117/12.509246
Show Author Affiliations
Gang Wu, Univ. of Electronic Science and Technology of China (China)
Lei Zhang, Univ. of Electronic Science and Technology of China (China)
You-Xi Tang, Univ. of Electronic Science and Technology of China (China)
Shao-Qian Li, Univ. of Electronic Science and Technology of China (China)
Yu Wang, Illinois Institute of Technology (United States)

Published in SPIE Proceedings Vol. 5245:
Internet Quality of Service
Mohammed Atiquzzaman; Mahbub Hassan, Editor(s)

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