On the Error Exponents of ARQ Channels with Deadlines
  We consider communication over Automatic Repeat reQuest (ARQ) memoryless channels with deadlines. In particular, an upper bound L is imposed on the maximum number of ARQ transmission rounds. In this setup, it is shown that incremental redundancy ARQ outperforms Forney's memoryless decoding in terms of the achievable error exponents. 
Praveen Kumar Gopala, Young-Han Nam and Hesham El Gamal