On the Performance of Link Adaptation Techniques in MIMO Systems

Authors:
Hung Tuan Nguyen;Jørgen Bach Andersen;Gert Frølund Pedersen
Affiliations:
Department of Communication Technology, Aalborg University Denmark, Aalborg, Denmark DK-9220;Department of Communication Technology, Aalborg University Denmark, Aalborg, Denmark DK-9220;Department of Communication Technology, Aalborg University Denmark, Aalborg, Denmark DK-9220
Venue:
Wireless Personal Communications: An International Journal
Year:
2007

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Abstract

Recent research results on multiple antennas system namely the multiple input multiple output (MIMO) system show that huge potential be it the spectral efficiency or the enhancement in transmission reliability can be achieved. In this paper, with the assumption that the channel is narrowband and the channel coefficients are known at both link ends, we propose and evaluate several link adaptation (LA) algorithms applied to the spatial multiplexing MIMO systems. Depending on the requirements, the LA technique is designed to optimize either the system spectral efficiency or the bit error rate (BER). We also consider the potential use of the maximum eigen beamforming in supporting concurrent users. The results show that efficient use of the channel information could lead to a significant improvement in the system performance.