Power Allocation for ARQ Two-Hop Cooperative Networks for Ultra-Reliable Communication

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We analyze the performance of amplify-and-forward (AF) automatic repeat request (ARQ) for a two-hop cooperative system with reliability constrains. For this setup, we first derive the closed-form outage probability expression. Next, we present a power allocation scheme that allows us to achieve a target outage probability, while minimizing the outage-weighted average power expenditure for asymmetric power allocation between the source and relay. This is cast as an optimization problem, and the optimal power allocation (OPA) is obtained in closed form by invoking the Karush-Kuhn-Tucker (KKT) conditions. We evaluate numerically the OPA strategy between different AFARQ transmission rounds and we show that the proposed scheme provides large power gains with respect to the optimized pointto-point ARQ scheme, as well as with respect to the equal power allocation (EPA) strategy.

Original languageEnglish
Title of host publicationProceedings of the 2020 IEEE International Conference on Communications, ICC 2020
Number of pages7
ISBN (Electronic)9781728150895
Publication statusPublished - Jul 2020
MoE publication typeA4 Conference publication
EventIEEE International Conference on Communications - Virtual Conference, Dublin, Ireland
Duration: 7 Jun 202011 Jun 2020

Publication series

NameIEEE International Conference on Communications
ISSN (Print)1550-3607
ISSN (Electronic)1938-1883


ConferenceIEEE International Conference on Communications
Abbreviated titleICC


  • Relays
  • Power system reliability
  • Probability
  • Resource management
  • Reliability
  • Protocols
  • Optimization


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