Analysis of conditional error rate and combining schemes in HARQ

Long, Hang and Xiang, Wei and Shen, Shanshan and Zhang, Yueying and Zheng, Kan and Wang, Wenbo (2012) Analysis of conditional error rate and combining schemes in HARQ. IEEE Transactions on Signal Processing, 60 (5). pp. 2677-2682. ISSN 1053-587X


In hybrid automatic repeat request (HARQ), maximum ratio combining (MRC) is usually employed at the receiver if the retransmission signal is the same as that in the first transmission. However, conventional performance analysis of HARQ and MRC does not consider that all previous transmissions fail. In this paper, we analyze the conditional error rate of HARQ with arbitrary combining schemes. Both the theoretical and approximate expressions of the conditional error rate are derived. Our analytical and simulation results reveal that conventional MRC is not optimum for HARQ, especially when the packet is short or the channel gain of the first transmission is much better than that of retransmission.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Electrical, Electronic and Computer Engineering
Date Deposited: 24 Jan 2013 11:37
Last Modified: 07 Oct 2014 04:33
Uncontrolled Keywords: conditional error rate; hybrid automatic repeat request (HARQ); maximum ratio combining (MRC)
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090609 Signal Processing
10 Technology > 1005 Communications Technologies > 100510 Wireless Communications
01 Mathematical Sciences > 0101 Pure Mathematics > 010104 Combinatorics and Discrete Mathematics (excl. Physical Combinatorics)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1109/TSP.2012.2184100

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