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Related Experiment Video

Updated: Jul 16, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Harmful Cooperation in Relay-Assisted MIMO Under Imperfect CSI.

Nikolaos Mouziouras1, Constantinos T Angelis1, Andreas Tsormpatzoglou1

  • 1Department of Informatics & Telecommunications, Campus of Arta, University of Ioannina, 47150 Arta, Greece.

Sensors (Basel, Switzerland)
|July 15, 2026
PubMed
Summary

Cooperative MIMO systems suffer performance loss from imperfect channel information and relay errors. A new relay activation method improves performance by selectively using reliable relays, enhancing system robustness.

Keywords:
ZF detectioncooperative MIMOdecode-and-forward relayingharmful cooperation regionimperfect CSIrelay error propagationreliability-aware relay activationsystem robustness

Related Experiment Videos

Last Updated: Jul 16, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Area of Science:

  • Wireless Communication Systems
  • Information Theory
  • Signal Processing

Background:

  • Cooperative multiple-input multiple-output (MIMO) systems offer diversity gains under ideal conditions.
  • Practical impairments like imperfect channel state information (CSI) and relay decoding errors significantly degrade performance.
  • Decode-and-Forward (DF) relaying is susceptible to error propagation, introducing structured interference.

Purpose of the Study:

  • Investigate cooperative MIMO performance under practical impairments.
  • Analyze the impact of imperfect CSI and relay errors on system performance.
  • Propose and evaluate a reliability-aware relay activation mechanism.

Main Methods:

  • Theoretical analysis of SINR and BER performance under imperfect CSI and relay errors.
  • Introduction of the 'harmful cooperation region' concept.
  • Development and simulation of a reliability-aware relay activation strategy.
  • Investigation of antenna scaling effects on system robustness.

Main Results:

  • Imperfect CSI causes SINR saturation and BER error floors.
  • Relay error propagation exacerbates performance degradation.
  • Cooperative systems can underperform direct MIMO in certain SNR regimes.
  • The proposed relay activation mechanism significantly improves BER performance.
  • Larger MIMO configurations show increased resilience to CSI imperfections.

Conclusions:

  • Cooperative transmission performance is highly SNR-dependent under imperfect CSI.
  • Robust system design requires joint consideration of CSI uncertainty, relay reliability, and system dimensions.
  • The reliability-aware relay activation mechanism effectively mitigates performance degradation.