Performance of multi-relay collaborative hybrid-ARQ protocols over fading channels

Igor Stanojev, Osvaldo Simeone, Yeheskel Bar-Ness, Cheolwoo You

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


According to collaborative Hybrid Automatic-Repeat-reQuest (ARQ) protocols, relay stations that have been able to decode the original message from previous transmissions, collaborate with the source in future retransmissions by jointly sending a space-time codeword. In this letter, analysis of the average number of retransmissions and throughput of Collaborative Hybrid-ARQ Type I (i.e., without memory) and Chase Combining (i.e., with memory) protocols is provided for any number of relays.

Original languageEnglish (US)
Pages (from-to)522-524
Number of pages3
JournalIEEE Communications Letters
Issue number7
StatePublished - Jul 2006

All Science Journal Classification (ASJC) codes

  • Modeling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering


  • Automatic-repeat-request (ARQ)
  • Block fading
  • Collaborative networks
  • Hybrid ARQ
  • Relay channel


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