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PHY 45-2 - On the optimality of frequency-domain equalization in DFT-spread MIMO-OFDM systems

: Jaeckel, S.; Jungnickel, V.


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE Wireless Communications and Networking Conference, WCNC 2008. Conference proceedings : 31 March - 3. April 2007, Las Vegas, Nevada, USA
Piscataway, NJ: IEEE, 2008
ISBN: 978-1-4244-1997-5
ISBN: 978-1-4244-1996-8
Wireless Communications and Networking Conference (WCNC) <2008, Las Vegas/Nev.>
Fraunhofer HHI ()
discrete fourier-transform; communication complexity; equaliser; frequency-domain analysis; least-mean-squares method; mimo communication; multiuser detection; ofdm modulation; radio receiver

In this paper, we compare linear receivers for DFT-spread MIMO-OFDM Systems. It is proven mathematically and illustrated by numerical simulations that the advanced DFT RAKE receiver with linear multiuser detection is equivalent to the popular frequency-domain equalization (FDE) with IDFT despreading. This result holds also for multi-antenna systems. As a consequence, broadband wireless transmission chains with high diversity can be implemented with low complexity at the receiving end. The benefit of using the minimum mean-square error (MMSE) criterion in the FDE is also illustrated.