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Cooperative ARQs with opportunistic distributed space-time coding: Effective protocols and performance analysis

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3 Author(s)
Hsin-Li Chiu ; Inst. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Wu, Sau-Hsuan ; Jin-Hao Li

The paper studies effective protocols and corresponding performance of automatic retransmission request (ARQ) via decode-and-forward (DF) opportunistic distributed space-time coding (ODSTC). Analysis shows that the diversity via ARQ can be drastically increased by allowing non-active relays to overhear the DSTC signal sent by the active relays. Nevertheless, simple schemes without overhearing may also achieve the same diversity when the link quality between the source-relay or the relay-destination is good, hence greatly alleviating the need for a complex protocol with overhearing. Moreover, using more relays opportunistically does provide a higher coding gain if the source-relay channel quality is extremely good, otherwise using two or three relays gives almost the same performance as if using all of them.

Published in:

Information Theory Workshop (ITW), 2010 IEEE

Date of Conference:

Aug. 30 2010-Sept. 3 2010