Title :
Link adaptation in a multi-antenna system
Author :
Jungnickel, Volker ; Haustein, Thomas ; Pohl, Volker ; Von Helmolt, Clemens
Author_Institution :
Fraunhofer Institut fur Nachrichtentechnik Heinrich-Hertz-Institut, Berlin, Germany
Abstract :
We consider link adaptation for multi-antenna systems based on channel information also that at the transmitter. Using adaptive channel inversion (ACI), a step-wise trade-off between spatial multiplexing and diversity is realized. Due to pre- and post-processing, the channel is corrupted only by Gaussian noise in front of the detectors. By jointly optimizing the number of data streams and the common modulation, a nearly continuous adaptation of spectral efficiency is realized. Up to moderate powers, the channel capacity is approached in regular and singular MIMO channels, provided that scalar coding is applied.
Keywords :
Gaussian noise; MIMO systems; antenna arrays; channel capacity; diversity reception; encoding; multiplexing; optimisation; radio transmitters; Gaussian noise; adaptive channel inversion; channel capacity; channel information; data streams optimization; link adaptation; multiantenna system; scalar coding; singular MIMO channels; spatial multiplexing; spectral efficiency adaptation; step-wise trade-off; transmitter; Channel capacity; Detectors; Eigenvalues and eigenfunctions; Gaussian noise; Information theory; MIMO; Matrix decomposition; Power control; Radio link; Radio transmitters;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual
Print_ISBN :
0-7803-7757-5
DOI :
10.1109/VETECS.2003.1207748
