Ergodic Achievable Rate Analysis and Optimization of RIS-Assisted Millimeter-Wave MIMO Communication Systems

Reconfigurable intelligent surfaces (RISs) have emerged as a prospective technology for next-generation wireless networks due to their potential in coverage and capacity enhancement. Previous works on achievable rate analysis of RIS-assisted communication systems have mainly focused on the rich-scat...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2023-02, Vol.22 (2), p.972-985
Main Authors: Li, Renwang, Sun, Shu, Chen, Yuhang, Han, Chong, Tao, Meixia
Format: Article
Language:English
Subjects:
achievable rate
Algorithms
Communication
Communications systems
Covariance matrix
Eigenvalues
Ergodic processes
Millimeter wave communication
Millimeter waves
millimeter-wave communications
MIMO communication
Optimization
Reconfigurable intelligent surface
Reflection
Reflection coefficient
reflection coefficients
Reflector antennas
Rician channels
Scattering
statistical channel state information (CSI)
Steering
transmit covariance matrix
Upper bound
Upper bounds
Wireless networks
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Summary:Reconfigurable intelligent surfaces (RISs) have emerged as a prospective technology for next-generation wireless networks due to their potential in coverage and capacity enhancement. Previous works on achievable rate analysis of RIS-assisted communication systems have mainly focused on the rich-scattering environment where Rayleigh and Rician channel models can be applied. This work studies the ergodic achievable rate of RIS-assisted multiple-input multiple-output communication systems in the millimeter-wave band with limited scattering under the Saleh-Valenzuela channel model. Firstly, we derive an upper bound of the ergodic achievable rate by means of majorization theory and Jensen's inequality. The upper bound shows that the ergodic achievable rate increases logarithmically with the number of antennas at the base station (BS) and user, the number of the reflection units at the RIS, and the eigenvalues of the steering matrices associated with the BS, user and RIS. Then, we aim to maximize the ergodic achievable rate by jointly optimizing the transmit covariance matrix at the BS and the reflection coefficients at the RIS. Specifically, the transmit covariance matrix is optimized by the water-filling algorithm and the reflection coefficients are optimized using the Riemannian conjugate gradient algorithm. Simulation results validate the effectiveness of the proposed optimization algorithms.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2022.3199991