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Computer Science > Information Theory

arXiv:2109.05316 (cs)
[Submitted on 11 Sep 2021]

Title:Successive Decode-and-Forward Relaying with Reconfigurable Intelligent Surfaces

Authors:Zaid Abdullah, Steven Kisseleff, Konstantinos Ntontin, Wallace Alves Martins, Symeon Chatzinotas, Bjorn Ottersten
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Abstract:The key advantage of successive relaying (SR) networks is their ability to mimic the full-duplex (FD) operation with half-duplex (HD) relays. However, the main challenge that comes with such schemes is the associated inter-relay interference (IRI). In this work, we propose a reconfigurable intelligent surface (RIS)-enhanced SR network, where one RIS is deployed near each of the two relay nodes to provide spatial suppression of IRI, and to maximize the gain of desired signals. The resultant max-min optimization problem with joint phase-shift design for both RISs is first tackled via the semidefinite programming (SDP) approach. Then, a lower-complexity solution suitable for real-time implementation is proposed based on particle swarm optimization (PSO). Numerical results demonstrate that even relatively small RISs can provide significant gains in achievable rates of SR networks, and the proposed PSO scheme can achieve a near optimal performance.
Subjects: Information Theory (cs.IT)
Cite as: arXiv:2109.05316 [cs.IT]
  (or arXiv:2109.05316v1 [cs.IT] for this version)
  https://doi.org/10.48550/arXiv.2109.05316

Submission history

From: Zaid Abdullah [view email]
[v1] Sat, 11 Sep 2021 16:39:13 UTC (176 KB)
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Steven Kisseleff
Konstantinos Ntontin
Wallace Alves Martins
Symeon Chatzinotas
Björn E. Ottersten
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