HARQ under outdated CSI, finite-blocklength regimes and generalised-rician fading

This work focuses on the impact of finite-blocklength (FBL) regimes on performance of hybrid automatic repeat request (HARQ) protocols under the proposed conditions of outdated channel state information (oCSI) severity, generalised-Rician fading and maximal-ratio-combining deployment. The outage probability (OP)|defined as the probability of erroneous HARQ short-packet transmissions and the OP is a key performance indicator in this work|will be derived in compact form under the proposed conditions. Compact expressions are obtained, which depict the OP under these practical conditions and present certain trade-off among latency, blocklength and the OP. A brief review of existing results is performed. Penalty of increasing information capacity and the dominance of system coherence are shown, which justifies this work.