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WIMOB
2008
IEEE

On Performance of MIMO Link Adaptation in the Presence of Channel Uncertainty

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On Performance of MIMO Link Adaptation in the Presence of Channel Uncertainty
—In this paper, link level adaptation algorithms in a system applying spatial multiplexing in the presence of channel uncertainty are considered. The first part of this paper deals with the impact of accuracy of the channel knowledge on the post-processing Signal-to-Noise Ratio (SNR) of transmitted multiple streams. This is evaluated by means of correlation coefficient between post-processing SNR values corresponding to the estimated and used channel matrix. In the second part of this paper, two link adaptation algorithms are introduced: the first algorithm adapts the modulation and coding scheme to the post-processing SNR level, whereas the second one searches for the optimum MIMO scheme (antenna selection) and does afterwards the adaptation of modulation and coding as well. Algorithms’ performance is evaluated assuming perfect channel knowledge and in the presence of channel uncertainty. The two algorithms show different gains when the channel knowledge is accurate, but also d...
Jelena Mirkovic, Bernhard Walke
Added 01 Jun 2010
Updated 01 Jun 2010
Type Conference
Year 2008
Where WIMOB
Authors Jelena Mirkovic, Bernhard Walke
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