University of Oulu

E. Dosti, U. L. Wijewardhana, H. Alves and M. Latva-aho, "Ultra reliable communication via optimum power allocation for type-I ARQ in finite block-length," 2017 IEEE International Conference on Communications (ICC), Paris, 2017, pp. 1-6. doi: 10.1109/ICC.2017.7996930

Ultra reliable communication via optimum power allocation for type-I ARQ in finite block-length

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Author: Dosti, Endrit1; Wijewardhana, Uditha Lakmal1; Alves, Hirley1;
Organizations: 1Centre for Wireless Communications (CWC), University of Oulu, 90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.4 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2017
Publish Date: 2019-06-04


We analyze the performance of the type-I automatic repeat request (ARQ) protocol with ultra-reliability constraints. First, we show that achieving a very low packet outage probability by using an open loop setup is a difficult task. Thus, we introduce the ARQ protocol as a solution for achieving the required low outage probabilities for ultra reliable communication. For this protocol, we present an optimal power allocation scheme that would allow us to reach any outage probability target in the finite block-length regime. We formulate the power allocation problem as minimization of the average transmitted power under a given outage probability and maximum transmit power constraint. By utilizing the Karush-Kuhn-Tucker (KKT) conditions, we solve the optimal power allocation problem and provide a closed form solution. Next, we analyze the effect of implementing the ARQ protocol on the throughput. We show that by using the proposed power allocation scheme we can minimize the loss of throughput that is caused from the retransmissions. Furthermore, we analyze the effect of the feedback delay length in our scheme.

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Series: IEEE International Conference on Communications
ISSN: 1550-3607
ISSN-E: 1938-1883
ISSN-L: 1550-3607
ISBN: 978-1-4673-8999-0
ISBN Print: 978-1-4673-9000-2
Pages: 1 - 6
DOI: 10.1109/ICC.2017.7996930
Host publication: 2017 IEEE International Conference on Communications (ICC)
Host publication editor: Gesbert, David
Debbah, Merouane
Mellouk, Abdelhamid
Conference: IEEE International Conference on Communications
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work has been partially supported by Finnish Funding Agency for Technology and Innovation (Tekes), Huawei Technologies, Nokia and Anite Telecoms, and Academy of Finland.
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