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31 janvier 2017
- handle: 10670/1.ldhwgg
- hal: hal-01633786
info:eu-repo/semantics/OpenAccess
Mots-clés
Block fading channels Energy efficiency Hybrid automatic repeat request HARQ Markov decision process MDP Rate adaptation ThroughputSujets proches
Natural science Sciences Science of scienceCiter ce document
Mohammed Jabi et al., « Adaptive Cross-Packet HARQ », HAL-SHS : sciences de l'information, de la communication et des bibliothèques, ID : 10670/1.ldhwgg
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Résumé
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joint coding can vary and may be based on the negative acknowledgment (NACK) provided by the receiver or, on the past (outdated) information about the channel states.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.