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

Dedicated to Prof. Reiner Rockmann on occasion of his 70th birt hday Abstract: Existing bit loading and transmit power allocation techniq ues are often optimized for maintaining both a fixed transmit power and a fix ed target bit-error rate while attempting to maximize the overall data-rate. However, delay-critical real-time interactive applications, such as voice or video transmiss ion, 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 per symbol along with the appropriate allocation of the transmit power are jointly optimized unde r the constraint of a given fixed data throughput. Our results show that in order to achie ve the best bit-error rate, not necessarily all MIMO layers have to be activated.

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