NDLI: A new joint transmit and receive optimization scheme for OFDM-based MIMO systems

Content Provider	IEEE Xplore Digital Library
Author	Khaled, N. Thoen, S. Vizzardi, M. Desset, C.
Copyright Year	2003
Description	Author affiliation: IMEC, Leuven, Belgium (Khaled, N.; Thoen, S.; Vizzardi, M.; Desset, C.)
Abstract	To approach the potential MIMO capacity while optimizing the system performance, a joint Tx/Rx MMSE design has been proposed. It is an optimal linear scheme for spatial multiplexing MIMO systems assuming a fixed number of parallel data streams as well as fixed modulation and coding across these streams. The use of OFDM enables a low-complexity implementation of this design for frequency-selective MIMO channels. In such a MIMO/OFDM set-up, the state-of-the-art joint Tx/Rx MMSE approach would arbitrarily choose and fix the number of space-frequency data streams p to be transmitted, which may lead to an inefficient power allocation strategy and a non-minimum bit-error-rate (BER). Therefore, in this paper, we propose to relax the fixed number of streams p constraint and address the issue of optimizing p for this design under fixed average total transmit power P/sub T/ and fixed global rate R constraints. In typical frequency-selective indoor channels, the resulting space-frequency optimized joint Tx/Rx MMSE design is shown to lead to a 10 dB SNR gain over the full spatial multiplexing conventional joint Tx/Rx MMSE design for a (2,2) MIMO/OFDM set-up at BER = 10/sup -3/ and an average spectral efficiency of 4 bits/carrier. Such a dramatic improvement is due to the better exploitation of the system's frequency and space diversity enabled by the proposed optimization.
Starting Page	998
Ending Page	1002
File Size	441161
Page Count	5
File Format	PDF
ISBN	0780377575
ISSN	10903038
DOI	10.1109/VETECS.2003.1207776
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-04-22
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Bit error rate Design optimization Wireless LAN Filters System performance Modulation coding OFDM modulation Gain Frequency diversity
Content Type	Text
Resource Type	Article

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