Analysis of Conditional Error Rate and Combining Schemes in HARQ

Author

Hang Long ; Wei Xiang ; Shanshan Shen ; Yueying Zhang ; Kan Zheng ; Wenbo Wang

Author_Institution

Sch. of Electron. Eng., Beijing Univ. of Posts & Telecommun., Beijing, China

Volume

60

Issue

5

fYear

2012

fDate

5/1/2012 12:00:00 AM

Firstpage

2677

Lastpage

2682

Abstract

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.

Keywords

automatic repeat request; diversity reception; error analysis; HARQ; channel gain; conditional error rate; conditional error rate analysis; hybrid automatic repeat request; maximum ratio combining; retransmission signal; Approximation methods; Automatic repeat request; Bit error rate; Diversity reception; Receivers; Signal to noise ratio; Conditional error rate; hybrid automatic repeat request (HARQ); maximum ratio combining (MRC);

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/TSP.2012.2184100

Filename

6129543