2026-04-17T02:42:01Zhttps://recercat.cat/oai/request

oai:recercat.cat:10230/360152025-12-18T01:05:56Zcom_2072_6col_2072_452952

00925njm 22002777a 4500 dc Asyhari, A. Taufiq author Guillén i Fábregas, A. (Albert) author 2018-12-07T14:53:06Z 2018-12-07T14:53:06Z 2014 We study transmission over multiple-input multiple-output block-fading channels with imperfect channel state information (CSI) at both the transmitter and receiver. In particular, based on mismatched decoding theory for a fixed channel realization, we investigate the largest achievable rates with independent and identically distributed inputs and the 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 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 in part by 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 in part by the Spanish Ministry of Economy and Competitiveness under grant TEC2012-38800-C03-03. Block fading Diversity Generalized mutual information Imperfect channel state information MIMO Mismatched decoding Multiple antenna Nearest neighbor decoding Outage probability Outage exponent Power adaptation MIMO block-fading channels with mismatched CSI