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We provide a comprehensive performance comparison of soft-output andhard-output demodulators in the context of non-iterative multiple-inputmultiple-output bit-interleaved coded modulation (MIMO-BICM). Coded bit errorrate (BER), widely used in literature for demodulator comparison, has thedrawback of depending strongly on the error correcting code being used. Thismotivates us to propose a code-independent performance measure in terms ofsystem capacity, i.e., mutual information of the equivalent modulation channelthat comprises modulator, wireless channel, and demodulator. We presentextensive numerical results for ergodic and quasi-static fading channels underperfect and imperfect channel state information. These results reveal that theperformance ranking of MIMO demodulators is rate-dependent. Furthermore, theyprovide new insights regarding MIMO-BICM system design, i.e., the choice ofantenna configuration, symbol constellation, and demodulator for a given targetrate.

Performance Assessment of MIMO-BICM Demodulators based on System Capacity