Intelligent Reflecting Surface Enhanced Wireless Network via Joint Active and Passive Beamforming

@article{Wu2019IntelligentRS,
  title={Intelligent Reflecting Surface Enhanced Wireless Network via Joint Active and Passive Beamforming},
  author={Qingqing Wu and Rui Zhang},
  journal={IEEE Transactions on Wireless Communications},
  year={2019},
  volume={18},
  pages={5394-5409}
}
  • Qingqing Wu, Rui Zhang
  • Published 6 October 2018
  • Computer Science
  • IEEE Transactions on Wireless Communications
Intelligent reflecting surface (IRS) is a revolutionary and transformative technology for achieving spectrum and energy efficient wireless communication cost-effectively in the future. Specifically, an IRS consists of a large number of low-cost passive elements each being able to reflect the incident signal independently with an adjustable phase shift so as to collaboratively achieve three-dimensional (3D) passive beamforming without the need of any transmit radio-frequency (RF) chains. In this… 
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Analytically show that as compared to the ideal case with continuous phase shifts, the IRS with discrete phase shifts achieves the same squared power gain in terms of asymptotically large number of reflecting elements, while a constant proportional power loss is incurred that depends only on the number of phase-shift levels.
Beamforming Optimization for Intelligent Reflecting Surface with Discrete Phase Shifts
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TLDR
This work analytically shows that as compared to the ideal case with continuous phase shifts, the IRS with discrete phase shifts achieves the same squared power gain in terms of asymptotically large number of reflecting elements, while a constant performance loss is incurred that depends only on the number of phase-shift levels.
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It is verified that the IRS can drastically enhance the link quality and coverage over the traditional setup without the IRS, and numerical results show significant performance enhancement with the use of IRS in typical wireless networks compared to benchmark schemes.
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Results demonstrate significant benefits of the proposed architecture based on a joint waveform and beamforming design to enlarge the R-E region of IRS-aided SWIPT.
Intelligent Reflecting Surface Assisted Wireless Powered Communication Networks
TLDR
The proposed IRS consisting of a large number of low-cost passive reflecting elements is deployed between a hybrid access point (HAP) and multiple wireless-powered users to boost both downlink energy transfer and uplink information transmission efficiency.
Transmit Power Minimization in Intelligent Reflecting Surfaces-Aided Uplink Communications
  • Jiao Wu, B. Shim
  • Computer Science
    2020 IEEE REGION 10 CONFERENCE (TENCON)
  • 2020
TLDR
This paper studies the power control problem at the user for an IRS-aided uplink system under the quality of service (QoS) constraints and develops an efficient algorithm, called the manifold-based alternating optimization (M-AO), which significantly saved the transmit power.
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References

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Intelligent Reflecting Surface Enhanced Wireless Network: Joint Active and Passive Beamforming Design
TLDR
Simulation results show that significant performance gains can be achieved by the proposed algorithms as compared to benchmark schemes, and it is verified that the IRS is able to drastically enhance the link quality and coverage over the conventional setup without the IRS.
Beamforming Optimization for Wireless Network Aided by Intelligent Reflecting Surface With Discrete Phase Shifts
TLDR
Analytically show that as compared to the ideal case with continuous phase shifts, the IRS with discrete phase shifts achieves the same squared power gain in terms of asymptotically large number of reflecting elements, while a constant proportional power loss is incurred that depends only on the number of phase-shift levels.
Beamforming Optimization for Intelligent Reflecting Surface with Discrete Phase Shifts
  • Qingqing Wu, Rui Zhang
  • Computer Science
    ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
  • 2019
TLDR
This work analytically shows that as compared to the ideal case with continuous phase shifts, the IRS with discrete phase shifts achieves the same squared power gain in terms of asymptotically large number of reflecting elements, while a constant performance loss is incurred that depends only on the number of phase-shift levels.
Weighted Sum Power Maximization for Intelligent Reflecting Surface Aided SWIPT
TLDR
It is proved that it is sufficient to send information signals only at the AP to serve both IDRs and EHRs regardless of their channel realizations, and simulation results show significant performance gains achieved by the proposed designs over benchmark schemes.
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TLDR
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TLDR
Simulation results show that incorporating jamming with artificial noise (AN) in transmit beamforming is generally beneficial to improve the secrecy rate, even under the new setup with IRS reflect beamforming.
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This paper establishes that if the number of RF chains is twice the total number of data streams, the hybrid beamforming structure can realize any fully digital beamformer exactly, regardless of the numberOf antenna elements, and shows that such an architecture can approach the performance of a fully digital scheme with much fewer number ofRF chains.
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