Relay Switching Aided Turbo Coded Hybrid-ARQ for Correlated Fading Channel

Ngo, Hoang Anh, Maunder, Robert and Hanzo, Lajos (2011) Relay Switching Aided Turbo Coded Hybrid-ARQ for Correlated Fading Channel. 2011 IEEE Wireless Communications and Networking Conference (WCNC), Cancun, Mexico. 28 - 31 Mar 2011. pp. 1706-1711 . (doi:10.1109/WCNC.2011.5779392).

Record type: Conference or Workshop Item (Paper)

Abstract

Hybrid-Automatic-Repeat-reQuest (HARQ) has become an indispensable technique in reliable communications systems. However, its performance is inevitably affected by the channel’s fading correlation. In this paper, we proposed a novel relay-switching aided HARQ scheme in order to mitigate the detrimental effects of correlated fading without unduly increasing the system’s complexity and delay. Our results show that the proposed relay-switching regime operates efficiently in correlated channels, hence significantly reduces the error floor of turbo-coded HARQ. Additionally, a HARQ scheme using Segment Selective Repeat (SSR) is incorporated in the relay-switching scheme for achieving further improvements. Quantitatively, the proposed relay-switching aided turbo-coded HARQ scheme using SSR may achieve an approximately 2 dB gain, compared to the conventional amplify-and-forward aided turbo coded HARQ arrangement using Chase Combining. Index Terms - Relay switching, correlated fading channel, Hybrid-ARQ, turbo codes, chase combining, incremental redundancy, selective segment repeat.

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