Throughput and delay analysis of truncated cooperative ARQ protocols using DSTC

In this paper, we evaluate the throughput and the packet total transmission delay for cooperative truncated Automatic Repeat Request (ARQ) using distributed space-time codes, where relays use either Decode-And-Forward (DF) or Amplify-and-Forward (AF) relaying. In this scheme, relays are involved in the retransmission only when the destination receives erroneously the packet. Both source and relays make use of an orthogonal space time block code. For the DF mode, relays are selected after a verification by the cyclic redundancy check (CRC) sequence. However, for the AF mode, all relays are involved in the retransmission. We show that the proposed design can significantly improve performances in terms of throughput and total transmission delay.