Comments and Corrections to "Capacity of Multiple-Antenna Systems With Both Receiver and Transmitter Channel State Information"

TL;DR

This paper corrects and clarifies the capacity plots for MIMO systems with channel state information, highlighting the performance differences with and without transmitter information, based on prior theoretical work.

Contribution

It provides corrected plots and insights into the performance contrast of MIMO systems with and without transmitter channel state information, addressing previous inaccuracies.

Findings

Corrected capacity plots for MIMO systems.

Highlighted performance differences with and without transmitter CSI.

Revealed new insights into system performance contrasts.

Abstract

The correspondence cited in the title [1] derived ergodic capacity of the coherent multiple-input multiple-output (MIMO) channel in independent and identically distributed (IID) Rayleigh fading. While the theoretical results are correct, several plots in the paper are incorrect. In this correspondence, we correct the plots. More importantly, the corrected plots present an interesting and compelling contrast between performances of the coherent MIMO systems with and without channel state information at the transmitter; whereas this view is somewhat limited in [1] because of flaws in the capacity curves.