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Improved techniques for 4 transmit and 4 receive antenna MIMO-OFDM for wireless communications

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4 Author(s)
Blum, R.S. ; EECS Dept, Lehigh Univ., Bethlehem, PA, USA ; Yan, Q. ; Li, Y. ; Winters, J.

We propose and analyze improved MIMO-OFDM techniques for wireless systems using QPSK modulation for four transmit and four receive antennas. Cases with frequency selective fading channels are considered. We first consider such a system, employing two 16-state, 2-antenna space-time codes with successive interference cancellation and channel estimation, which was previously proposed to reduce the complexity of a 4-antenna space-time code system. We. show that our previously proposed space-time code has a 2 dB improvement over a previously published code at 5 Hz fading. Furthermore, we propose a 4-antenna, 16-state code that achieves an additional 2 dB improvement with lower complexity and a 256-state code that achieves an additional 2 dB gain. The 256-state code performs within 3 dB of the outage capacity (and within 2 dB with perfect channel estimation), which is better than any other published result, yet does not use complex iterative decoding

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Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd  (Volume:2 )

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