標題: Effectiveness and Relay Efficiency of Opportunistic Multipoint Relaying on Cooperative ARQ
作者: Wu, Sau-Hsuan
Chiu, Hsin-Li
Li, Jin-Hao
電信工程研究所
Institute of Communications Engineering
關鍵字: Distributed space-time coding (DSTC);diversity analysis;opportunistic multipoint relaying (OMPR);relay-assisted Automatic Repeat reQuest (ARQ)
公開日期: 1-Jun-2017
摘要: This paper studies the effectiveness and relay efficiency of using opportunistic multipoint relaying and distributed space-time coding (ODSTC) for cooperative Automatic Repeat reQuest (ARQ). According to the complexities for diversity exploration in retransmissions, three types of ARQ protocols are studied herein, allowing us to examine the effectiveness of the protocols and the efficiencies of using ODSTC relaying for ARQ. The efficiency is studied from the viewpoint of the signal quality enhancement per active relay, while the effectiveness is investigated from the perspectives of diversity and throughput improvements with the different protocols. The results show that both are closely related to the link qualities of the forwarding channels. When the link quality between the source and relays is considerably higher than the quality between the relays and the destination, a simple protocol that opportunistically chooses two active relays for ODSTC (ODSTC2) at the beginning of retransmissions is good enough to yield a significant throughput improvement. Otherwise, when the performance is limited by the number of successfully decoding relays, then having relays of unsuccessful decoding to overhear the signals sent by active relays plays a crucial role in resolving the limitation. By having the new successfully decoding relays to participate in the subsequent retransmissions, both diversity and throughput can be significantly improved. According to our analysis and simulation studies, an appropriate protocol with ODSTC2 in general can provide effective throughput improvements in two times retransmissions.
URI: http://dx.doi.org/10.1109/TVT.2016.2614782
http://hdl.handle.net/11536/145681
ISSN: 0018-9545
DOI: 10.1109/TVT.2016.2614782
期刊: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume: 66
起始頁: 4781
結束頁: 4796
Appears in Collections:Articles