Performance Assessment of MIMO-BICM Demodulators based on System Capacity

We provide a comprehensive performance comparison of soft-output and hard-output demodulators in the context of non-iterative multiple-input multiple-output bit-interleaved coded modulation (MIMO-BICM). Coded bit error rate (BER), widely used in literature for demodulator comparison, has the drawbac...

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Bibliographic Details
Published inarXiv.org
Main Authors Fertl, Peter, Jalden, Joakim, Matz, Gerald
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 04.12.2010
Subjects
Bit error rate
Codes
Communication channels
Constellations
Demodulators
Error correcting codes
Error correction
Iterative methods
MIMO (control systems)
Modulation
Performance assessment
Systems design
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Summary:We provide a comprehensive performance comparison of soft-output and hard-output demodulators in the context of non-iterative multiple-input multiple-output bit-interleaved coded modulation (MIMO-BICM). Coded bit error rate (BER), widely used in literature for demodulator comparison, has the drawback of depending strongly on the error correcting code being used. This motivates us to propose a code-independent performance measure in terms of system capacity, i.e., mutual information of the equivalent modulation channel that comprises modulator, wireless channel, and demodulator. We present extensive numerical results for ergodic and quasi-static fading channels under perfect and imperfect channel state information. These results reveal that the performance ranking of MIMO demodulators is rate-dependent. Furthermore, they provide new insights regarding MIMO-BICM system design, i.e., the choice of antenna configuration, symbol constellation, and demodulator for a given target rate.
ISSN:2331-8422