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Spectral Efficiency Maximization for Mixed-Structure Cognitive Radio Hybrid Wideband Millimeter-Wave Transceivers in

Hafiz Muhammad Tahir Mustafa1,2, Jung-In Baik1,2, Hyoung-Kyu Song1,2

  • 1Department of Information and Communication Engineering, Sejong University, Seoul 05006, Republic of Korea.

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Summary
This summary is machine-generated.

This study introduces a cognitive radio network (CRN) approach for hybrid wideband precoding in millimeter-wave systems to boost spectral efficiency. The proposed method effectively maximizes efficiency while managing interference in multi-user MIMO setups.

Keywords:
MU-MIMO systemcognitive radiodecode-and-forward relayhybrid wideband transceivermillimeter-wave technologyspectral efficiency maximization

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Area of Science:

  • Wireless Communications
  • Signal Processing
  • Information Theory

Background:

  • Millimeter-wave (mmWave) systems offer high bandwidth but face challenges in multi-user, multiple-input multiple-output (MIMO) environments.
  • Hybrid beamforming is crucial for managing complexity and power consumption in mmWave systems.
  • Cognitive radio networks (CRNs) enable dynamic spectrum access and efficient resource utilization.

Purpose of the Study:

  • To propose a novel cognitive radio network (CRN)-based hybrid wideband precoding scheme.
  • To maximize spectral efficiency in relay-assisted multi-user (MU) multiple-input multiple-output (MIMO) systems operating in the millimeter-wave (mmWave) spectrum.
  • To address the NP-hard and non-convex optimization problem inherent in joint hybrid precoding design.

Main Methods:

  • Decomposition of the complex optimization problem into manageable sub-problems.
  • Decoupled design methodology applied to each sub-problem.
  • Phase-only beamforming derived to maximize spectral efficiency.
  • Digital baseband processing designed to control interference below a set threshold.
  • Consideration of both mixed and fully connected hybrid beamforming architectures with decode-and-forward (DF) relays.

Main Results:

  • The proposed hybrid precoding technique effectively maximizes spectral efficiency in mmWave MU-MIMO systems.
  • Phase-only beamforming successfully enhances spectral efficiency, while digital components manage interference.
  • Simulations demonstrate the technique's effectiveness across various system parameters and channel-state information (CSI) accuracy levels.
  • The mixed hybrid architecture exhibits superior energy efficiency compared to other configurations and benchmarks.

Conclusions:

  • The CRN-based hybrid wideband precoding scheme offers a viable solution for enhancing spectral efficiency in mmWave systems.
  • The decoupled design approach simplifies the complex optimization problem, yielding effective phase-only and digital beamforming solutions.
  • The mixed hybrid architecture presents a promising trade-off between performance and energy efficiency for future wireless networks.