Multipacket Hybrid ARQ: Closing Gap to the Ergodic Capacity
| Autor: | Aata El Hamss, Mohammed Jabi, Pablo Piantanida, Leszek Szczecinski |
|---|---|
| Přispěvatelé: | Institut National de la Recherche Scientifique [Québec] (INRS), InterDigital Communications, Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2015 |
| Předmět: |
FOS: Computer and information sciences
Computer science Computer Science - Information Theory Hybrid automatic repeat request Throughput Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI] 0203 mechanical engineering [MATH.MATH-ST]Mathematics [math]/Statistics [math.ST] Computer Science::Networking and Internet Architecture 0202 electrical engineering electronic engineering information engineering Superposition Coding Electrical and Electronic Engineering Computer Science::Information Theory Block (data storage) Network packet Information Theory (cs.IT) ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS Block Fading Channels [MATH.MATH-IT]Mathematics [math]/Information Theory [math.IT] 020206 networking & telecommunications 020302 automobile design & engineering Time Sharing Transmission (telecommunications) Partial State Information [INFO.INFO-IT]Computer Science [cs]/Information Theory [cs.IT] Markov decision process Algorithm Markov Decision Process Decoding methods Hybrid Automatic Repeat reQuest Communication channel |
| Zdroj: | IEEE Transactions on Communications IEEE Transactions on Communications, Institute of Electrical and Electronics Engineers, 2015, ⟨10.1109/TCOMM.2015.2493138⟩ |
| ISSN: | 0090-6778 |
| DOI: | 10.1109/tcomm.2015.2493138 |
| Popis: | International audience; In this work we consider incremental redundancy (IR) hybrid automatic repeat request (HARQ), where transmission rounds are carried out over independent block-fading channels. We propose the so-called multi-packet HARQ where the transmitter allows different packets to share the same channel block. In this way the resources (block) are optimally assigned throughout the transmission rounds. This stands in contrast with the conventional HARQ, where each transmission round occupies the entire block. We analyze superposition coding and time-sharing transmission strategies and we optimize the parameters to maximize the throughput. Besides the conventional one-bit feedback (ACK/NACK) we also consider the rich, multi-bit feedback. To solve the optimization problem we formulate it as a Markov decision process (MDP) problem where the decisions are taken using accumulated mutual information (AMI) obtained from the receiver via delayed feedback. When only one-bit feedback is used to inform the transmitter about the decoding success/failure (ACK/NACK), the Partial State Information Markov Decision Process (PSI-MDP) framework is used to obtain the optimal policies. Numerical examples obtained in a Rayleigh-fading channel indicate that, the proposed multi-packet HARQ outperforms the conventional one, by more than 5 dB for high spectral efficiencies. |
| Databáze: | OpenAIRE |
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