YesWe study transmission over multiple-input multiple-output (MIMO) block-fading channels with
imperfect channel state information (CSI) at both the transmitter and receiver. Specifically, based on
mismatched decoding theory for a fixed channel realization, we investigate the largest achievable rates
with independent and identically distributed inputs and a nearest neighbor decoder. We then study the
corresponding information outage probability in the high signal-to-noise ratio (SNR) regime and analyze
the interplay between estimation error variances at the transmitter and at the receiver to determine
the optimal outage exponent, defined as the high-SNR slope of the outage probability plotted in a
logarithmic-logarithmic scale against the SNR. We demonstrate that despite operating with imperfect
CSI, power adaptation can offer substantial gains in terms of outage exponent.A. T. Asyhari was supported in part by the Yousef Jameel Scholarship, University of Cambridge, Cambridge, U.K., and the National Science Council of Taiwan under grant NSC 102-2218-E-009-001. A. Guillén i Fàbregas was supported in part by the European Research Council under ERC grant agreement 259663 and the Spanish Ministry of Economy and Competitiveness under grant TEC2012-38800-C03-03
