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From theory to practice: MIMO real-time experiments of adaptive bit-loading with linear and non-linear transmission and detection schemes


IEEE Vehicular Technology Society -VTS-:
IEEE 61st Vehicular Technology Conference, VTC 2005 Spring. Proceedings. Vol.2 : Paving the path for a wireless future ; 30 May - 1 June 2005, Stockholm, Sweden
Piscataway, NJ: IEEE Operations Center, 2005
ISBN: 0-7803-8887-9
ISBN: 0-7803-8888-7
Vehicular Technology Conference (VTC) <61, 2005, Stockholm>
Fraunhofer HHI ()
adaptive signal detection; eigenvalues and eigenfunctions; error statistics; interference suppression; least mean squares method; mimo system; radio link; telecommunication channels

In this paper we investigate the achievable practical throughput with channel aware bit-loading in experiments on a real-time MIMO test-bed. We compare three prominent MIMO transmission schemes, two of them are using only receive side detection namely linear MMSE or MMSE with successive interference cancellation while the third scheme is SVD-MIMO transmission or eigenspace-signalling, where the transmitter and the receiver both perform a joint signal processing. We show in measurements that a more complex scheme like V-BLAST can increase the link reliability significantly by either increasing the throughput al a fixed bit error rate or improving the bit error rate at a fixed rate. Furthermore we show that eigenspace-signalling outperforms LMMSE and V-BLAST in terms of achievable throughput especially in the low SNR region but requires accurate channel state information and signal processing at each side of the link.