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Modulation-Mode and Power Assignment in SVD-Equalized MIMO Systems

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Author(s): Andreas Ahrens | Christoph Lange

Journal: Facta Universitatis Series : Electronics and Energetics
ISSN 0353-3670

Volume: 21;
Issue: 2;
Start page: 167;
Date: 2008;
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Keywords: Multiple input multiple output system | singular value decomposition | bit allocation | power allocation | wireless transmission

ABSTRACT
Existing bit loading and transmit power allocation techniques are often optimized for maintaining both a fixed transmit power and a fixed target bit-error rate while attempting to maximize the overall data-rate. However, delay-critical real-time interactive applications, such as voice or video transmission, may require a fixed data rate. In this contribution the number of activated layers in a multiple input multiple output (MIMO) system and the number of bits appropriate allocation of the transmit power are jointly optimized under the constraint of a given fixed data throughput. Our results show that in order to achieve the best bit-error rate, not necessarily all MIMO layers have to be activated.
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