Analysis of SVD-Aided, Iteratively Detected Spatial Division Multiplexing using EXIT Charts

In this contribution iteratively detected spatial division multiplexing is investigated under the constraint of a fixed data throughput. Ex-isting 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, albeit delay-critical real-time interactive applications, such as voice or video transmission, may require a fixed data rate. As an alternative design option, in addition to sophisticated joint bit- and power loading, in this contribution we invoke both coded modulation as well as channel prediction and identify the most beneficial num-ber of modulation signalling levels, while minimizing the bit-error ratio under the constraints of a given fixed throughput. Our perfor-mance results show the superiority of bit-interleaved coded modula-tion using iterative decoding (BICM-ID) against turbo trellis-coded modulation (TTCM), regardless of using idealistic perfect or realis-tic imperfect channel state information (CSI)