Performance Assessment of MIMO-BICM Demodulators based on System Capacity

TL;DR

This paper compares various MIMO-BICM demodulators using a code-independent system capacity measure, providing insights into their performance across different rates and channel conditions for improved system design.

Contribution

It introduces a novel, code-independent performance metric based on system capacity for evaluating MIMO-BICM demodulators, replacing BER-based comparisons.

Findings

Demodulator performance ranking varies with target rate.

System capacity offers a more consistent performance measure.

Design choices like antenna configuration and modulation depend on target rate.

Abstract

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.