HARQ and AMC: Friends or Foes?
| Autor: | Benoit Pelletier, Long Bao Le, Leszek Szczecinski, Redouane Sassioui, Mustapha Benjillali, Mohammed Jabi |
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| Rok vydání: | 2016 |
| Předmět: |
FOS: Computer and information sciences
Computer science business.industry Computer Science - Information Theory Information Theory (cs.IT) Hybrid automatic repeat request 020206 networking & telecommunications 020302 automobile design & engineering Throughput Link adaptation Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology 0203 mechanical engineering Modulation Redundancy (engineering) 0202 electrical engineering electronic engineering information engineering Electronic engineering Fading Electrical and Electronic Engineering Telecommunications business Decoding methods Communication channel |
| Zdroj: | GLOBECOM |
| DOI: | 10.48550/arxiv.1606.05177 |
| Popis: | To ensure reliable communication in randomly varying and error-prone channels, wireless systems use adaptive modulation and coding (AMC) as well as hybrid ARQ (HARQ). In order to elucidate their compatibility and interaction, we compare the throughput provided by AMC, HARQ, and their combination (AMC-HARQ) under two operational conditions: in slow- and fast block-fading channels. Considering both, incremental redundancy HARQ (HARQ-IR) and repetition redundancy HARQ (HARQ-RR) we optimize the rate-decision regions for AMC/HARQ and compare them in terms of attainable throughput. Under a fairly general model of the channel variation and the decoding functions, we conclude that i) adding HARQ on top of AMC may be counterproductive in the high average signal- to-noise ratio regime for fast fading channels, and ii) HARQ is useful for slow fading channels, but it provides moderate throughput gains. We provide explanations for these results which allow us to propose paths to improve AMC-HARQ systems. |
| Databáze: | OpenAIRE |
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