Hi!
Recently, I found an interesting article, titled "Abeywickrama, S., Zhang, R., Wu, Q., & Yuen, C. (2020). Intelligent Reflecting Surface: Practical Phase Shift Model and Beamforming Optimization", in https://doi.org/10.1109/tcomm.2020.3001125
I found it may help me achieve my goals in verifying reconfigurable intelligent surface-aided MU-MIMO communication simulation.
This article would make a really positive contribution to my work.
Especially, the paper investigates the Practical Phase Shift Model in a multi-user setup and considers two efficient algorithms to solve the multiuser beamforming optimization problem suboptimally. And then, I have some questions about this work.
Q1:
How to use those two algorithms (section-V. B Extended Penalty-Based Algorithm and section-V.C Two-Stage Algorithm) to solve the modulus constraint problem (Not equal to 1) in the Practical Phase Shift Model (while constant modulus constraint in ideal phase shift models)?
Q2:
How to design and implement corresponding programs in the system model?
In other words, I have some difficulties understanding them. I maybe need to understand this framework's source code to establish the effect of active beamforming and passive beamforming in RIS-aided MIMO communication.
It will do great help to me if you could provide me with some more detailed guidelines or some examples.
I am looking forward to your reply.
Best regards,
Meng
Email:[email protected]
The penalty-based algorithm you mentioned operates by alternately optimizing four sets of variables. This corresponds to an outer loop where each set of parameters is updated in turn, following the formulas given in (46), (50), (56), and (57).
Furthermore, regarding the problem (P6.3), N RIS phase shifts are optimized one by one. Specifically,
1> Randomly initialize all RIS phase shifts.
2> For each RIS element, the phase shift is optimized according to Eq. (16) of the conference version (URL as follows). This optimization is a univariate process. This step is repeated N times.
https://ieeexplore.ieee.org/document/9148961
3> Repeat performing the second step several times until the objective function converges.
The article below provides a simpler scheme for configuring the RIS FYI.
https://ieeexplore.ieee.org/abstract/document/9614196
https://ieeexplore.ieee.org/abstract/document/9952197
Good luck!
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