Title :
Iterative MLD equalizer preceded by MIMO-FDE for wideband spatial multiplexing systems
Author :
Nouda, Yasunori ; Koike, Toshiaki ; Yoshida, Susumu
Author_Institution :
Graduate Sch. of Informatics, Kyoto Univ., Japan
fDate :
30 May-1 June 2005
Abstract :
We propose an iterative maximum-likelihood detection (MLD) equalizer using frequency-domain equalization (FDE) at the former stages for wideband transmissions in multiple-input multiple-output (MIMO) systems. The proposed equalization scheme extends the MIMO-MLD for frequency-selective channels, instead of the use of OFDM transmissions. It achieves nearly the ML sequence estimation (MLSE) performance by means of the iterative ISI cancellations. Moreover, we derive an approximated MLD for complexity reduction from a viewpoint of the optimization problem. It is demonstrated that the iterative equalization scheme employing the approximated MLD can offer excellent performance under extremely heavily-dispersive wideband channels, with no requirement of exponential complexity order.
Keywords :
MIMO systems; approximation theory; computational complexity; dispersive channels; equalisers; frequency-domain analysis; interference suppression; intersymbol interference; iterative methods; maximum likelihood detection; optimisation; space division multiplexing; MIMO frequency-domain equalization; ML sequence estimation; MLSE; OFDM; complexity reduction; dispersive channels; frequency-selective channels; iterative ISI cancellation; iterative ML detection equalizer; iterative maximum-likelihood detection equalizer; multiple-input multiple-output systems; optimization; wideband spatial multiplexing systems; Computational complexity; Equalizers; Fading; Field programmable gate arrays; Frequency estimation; Intersymbol interference; MIMO; Maximum likelihood estimation; OFDM; Wideband;
Conference_Titel :
Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st
Print_ISBN :
0-7803-8887-9
DOI :
10.1109/VETECS.2005.1543348
