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On MIMO Signal Processing for
Adaptive
W-CDMA and OFDM Wireless Transceivers
Danijela Čabrić, Dejan
Marković, Robert W. Brodersen
2005 IEEE/ACES Conference on
Wireless Communications and Applied Computational Electromagnetics, April 2005.
Abstract:
In this paper, we consider wideband
extensions of narrowband signal processing techniques
for MIMO wireless transceivers. The extensions are applied and analyzed on
commonly used wideband systems such as W-CDMA and
OFDM. We focus on signal processing
techniques for channel estimation and correction, including pilot-aided and
decision-directed LMS-based adaptive estimation.
Simulation study compares cases with one and
two transmit/receive antennas and shows that BER of W-CDMA system consistently
improves by exploiting multi-path diversity through
additional antenna at the receiver, while
additional transmit antenna is beneficial under specific channel conditions. BER
performance in OFDM is more sensitive to the value
of the channel’s smallest eigen-value than
to the eigen-spread. In most practical cases, therefore, the sub-channels with
small eigen-values are not usable due to poor
BER.
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