Blockage-Aware Robust Beamforming in RIS-Aided Mobile Millimeter Wave MIMO Systems
arxiv(2024)
摘要
Millimeter wave (mmWave) communications are sensitive to blockage over radio
propagation paths. The emerging paradigm of reconfigurable intelligent surface
(RIS) has the potential to overcome this issue by its ability to arbitrarily
reflect the incident signals toward desired directions. This paper proposes a
Neyman-Pearson (NP) criterion-based blockage-aware algorithm to improve
communication resilience against blockage in mobile mmWave multiple input
multiple output (MIMO) systems. By virtue of this pragmatic blockage-aware
technique, we further propose an outage-constrained beamforming design for
downlink mmWave MIMO transmission to achieve outage probability minimization
and achievable rate maximization. To minimize the outage probability, a robust
RIS beamformer with variant beamwidth is designed to combat uncertain channel
state information (CSI). For the rate maximization problem, an accelerated
projected gradient descent (PGD) algorithm is developed to solve the
computational challenge of high-dimensional RIS phase-shift matrix (PSM)
optimization. Particularly, we leverage a subspace constraint to reduce the
scope of the projection operation and formulate a new Nesterov momentum
acceleration scheme to speed up the convergence process of PGD. Extensive
experiments confirm the effectiveness of the proposed blockage-aware approach,
and the proposed accelerated PGD algorithm outperforms a number of
representative baseline algorithms in terms of the achievable rate.
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