Design of Full-Duplex Millimeter-Wave Integrated Access and Backhaul Networks

Junkai Zhang, Navneet Garg, Mark Holme, Tharm Ratnarajah

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

One of the key technologies for the future cellular networks is full-duplex (FD) enabled Integrated Access and Backhaul (IAB) networks operating in the millimeter-wave (mmWave) frequencies. The main challenge in realizing the FD-IAB networks is mitigating the impact of self-interference (SI) in the wideband mmWave frequencies. In this article, we first introduce the 3GPP IAB network architectures and wideband mmWave channel models. By utilizing the subarray-based hybrid precoding scheme, at the FD-IAB-node, multiuser interference is mitigated using zero-forcing (ZF) at the transmitter, whereas the residual SI after successfully deploying antenna and analog cancellation is canceled by minimum
mean square error (MMSE) baseband combiner at the receiver. The spectral efficiency (SE) is evaluated for the RF insertion loss (RFIL) with different kinds of phase shifters and the channel uncertainty. Simulation results show that, in the
presence of the RFIL, the almost double SE, which is close to that obtained from fully connected hybrid precoding, can be achieved as compared with half-duplex systems, when the uncertainties are of low strength.
Original languageEnglish
Pages (from-to)60 - 67
Number of pages8
JournalIEEE Wireless Communications
Volume28
Issue number1
Early online date24 Feb 2021
DOIs
Publication statusE-pub ahead of print - 24 Feb 2021

Keywords / Materials (for Non-textual outputs)

  • Radio frequency
  • Uncertainty
  • Precoding
  • Transmitting antennas
  • Millimeter wave technology
  • Channel estimation
  • Wideband
  • Cellular networks
  • Full-duplex system

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