Adaptive Cross-Packet HARQ

Abstract : In this work, we investigate a coding strategy devised to increase the throughput in hybrid ARQ (HARQ) transmission over block fading channel. In our approach, the transmitter jointly encodes a variable number of bits for each round of HARQ. The parameters (rates) of this joint coding can vary and may be based on the negative acknowledgment (NACK) provided by the receiver or, on the past (outdated) information about the channel states. These new degrees of freedom allow us to improve the match between the codebook and the channel states experienced by the receiver. The results indicate that gains obtained using the proposed cross-packet coding strategy are particularly notable for large values of the throughput. In this region, the conventional HARQ fails to offer throughput improvement even if the number of transmission rounds is increased. We implement the proposed cross-packet HARQ using turbo codes where we show that the theoretically predicted throughput gains materialize in practice; the implementation challenges are also discussed.
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IEEE Transactions on Communications, Institute of Electrical and Electronics Engineers, 2017
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Dernière modification le : mardi 14 novembre 2017 - 01:11:37

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Mohammed Jabi, Abdellatif Benyouss, Mael Le Treust, Etienne Pierre-Doray, Leszek Szczecinski. Adaptive Cross-Packet HARQ. IEEE Transactions on Communications, Institute of Electrical and Electronics Engineers, 2017. 〈hal-01633786〉

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