Abstract
In wireless decode-and-forward (DF) relaying networks, the hybrid ARQ (HARQ) process suffers severe latency, especially when centralized scheduling is employed. We propose a new distributed HARQ based cooperative relaying (DHCR) protocol to reduce the latency. Based on the reception quality of the 1 st hop, each relay station (RS) independently processes and forwards the data stream in such a manner that, from the perspective of the destination, three cooperative relaying modes can be effectively formed and one of them is adaptively selected: spatial multiplexing (SM), space-time transmit diversity (STTD) and unicast (UC). The proposed DHCR protocol places priority on SM and it is throughput-oriented. In addition, we develop a new analytical model based on the Markov chain to facilitate the performance analysis of the proposed protocol. Based on the new model, we have derived the exact expressions for spectral efficiency, latency and the distribution of latency. It is revealed that the new DHCR protocol can decrease the latency by around 40% at high signal-to-noise ratio (SNR) without loss of spectral efficiency compared with the centralized approach.
Original language | English |
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Title of host publication | 2010 IEEE International Conference on Communications, ICC 2010 |
Place of Publication | Piscataway, NJ |
Publisher | Institute of Electrical and Electronics Engineers (IEEE) |
Pages | 1-6 |
Number of pages | 6 |
ISBN (Print) | 9781424464043 |
DOIs | |
Publication status | Published - 2010 |
Externally published | Yes |
Event | 2010 IEEE International Conference on Communications, ICC 2010 - Cape Town, South Africa Duration: 23 May 2010 → 27 May 2010 |
Other
Other | 2010 IEEE International Conference on Communications, ICC 2010 |
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Country/Territory | South Africa |
City | Cape Town |
Period | 23/05/10 → 27/05/10 |