Title :
Optimal minimum distance-based precoder for MIMO spatial multiplexing systems
Author :
Collin, Ludovic ; Berder, Olivier ; Rostaing, Philippe ; Burel, Gilles
Author_Institution :
LEST-UMR CNRS, Brest, France
fDate :
3/1/2004 12:00:00 AM
Abstract :
We describe a new precoder based on optimization of the minimum Euclidean distance dmin between signal points at the receiver side and for use in multiple-input multiple-output (MIMO) spatial multiplexing systems. Assuming that channel state information (CSI) can be made available at the transmitter, the three steps ( noise whitening, channel diagonalization and dimension reduction), which are currently used in investigations on MIMO systems, are performed. Thanks to this representation, an optimal dmin precoder is derived in the case of two different transmitted data streams. For quadrature phase-shift keying (QPSK) modulation, a numerical approach shows that the precoder design depends on the channel characteristics. Comparisons with maximum signal-to-noise ratio (SNR) strategy and other precoders based on criteria, such as water-filling (WF), minimum mean square error (MMSE), and maximization of the minimum singular value of the global channel matrix, are performed to illustrate the significant bit-error-rate (BER) improvement of the proposed precoder.
Keywords :
MIMO systems; channel coding; error statistics; least mean squares methods; matrix algebra; modulation coding; multiplexing; optimisation; quadrature phase shift keying; telecommunication channels; BER; MIMO spatial multiplexing systems; MMSE; QPSK; SNR; bit-error-rate; channel diagonalization; channel state information; data streams transmission; eigen-diagonal representation; global channel matrix; minimum Euclidean distance; minimum mean square error; minimum singular value maximization; multiple input multiple output systems; noise whitening; optimal linear precoder; optimal minimum distance-based precoder; quadrature phase shift keying modulation; receivers; signal-to-noise ratio; transmitters; water-filling; Channel state information; Euclidean distance; MIMO; Mean square error methods; Noise reduction; Phase modulation; Phase shift keying; Quadrature phase shift keying; Signal to noise ratio; Transmitters;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2003.822365