Rate adaptation design for adaptive modulation/coding systems with hybrid ARQ

Authors:
Chia-Hao Yu;Olav Tirkkonen
Affiliations:
Helsinki University of Technology (TKK), FIN, TKK, Finland;Helsinki University of Technology (TKK), FIN, TKK, Finland
Venue:
Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly
Year:
2009

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Abstract

Combining Adaptive Modulation/Coding (AMC) and hybrid ARQ (HARQ) is considered in an analytic framework. Using Chase combining, optimum rate adaptation are derived for an AMC/HARQ system under instantaneous and average error constraints, as well as an unconstrained situation. The results show that throughput gain depends on the maximum number of retransmissions, the imposed error constraint and the characteristics of error performance curves of the MCS set. The throughput degradation due to the practical error constraints can be effectively compensated by using ARQ, with a low number of the maximum retransmissions.