The effective capacity of two-unicast network coding STBC under retransmission schemes

Bouteggui M., Merazka F., Karabulut Kurt G. Z.

DIGITAL SIGNAL PROCESSING, vol.106, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 106
  • Publication Date: 2020
  • Doi Number: 10.1016/j.dsp.2020.102819
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC
  • Istanbul Technical University Affiliated: Yes


Downlink multiuser network coding (NC) automatic repeat request (ARQ) systems can provide significant throughput improvements over basic ARQ systems. In this paper, we consider the case of two-unicast flows and analyze their performance in terms of the effective capacity (EC) under retransmission schemes. We extend the derived EC of NC-ARQ for asymmetric channels where users have different data rates. For NC-ARQ two scenarios at the source are considered to handle the transmission. The EC expression for two-unicast flows using Alamouti space time block coding (STBC) is also derived. We also present a new scheme that combines both NC and STBC and, denoted by NC-STBC-ARQ, Our results show that the new NC-STBC-ARQ improves the EC over basic STBC in the low-to-moderate signal-to-noise ratio (SNR) regime. Besides, the new NC-STBC-ARQ improves the EC compared to basic NC-ARQ for a moderate-to-high SNR regime. (C) 2020 Elsevier Inc. All rights reserved.