Capacity Maximization for RIS-assisted Multi-user MISO Communication Systems
<|reference_start|>Capacity Maximization for RIS-assisted Multi-user MISO Communication Systems: We consider a multi-user multiple input single output (MU-MISO) system assisted by a reconfigurable intelligent surface (RIS). For such a system, we aim to optimally select the RIS phase shifts and precoding vectors for maximizing the effective rank of the weighted channel covariance matrix which in turn improves the channel capacity. For a low-complex transmitter design, we employ maximum ratio transmission (MRT) and minimum-mean square error (MMSE) precoding schemes along with water-filling algorithm-based power allocation. Further, we show that MRT and MMSE exhibit equivalent performance and become optimal when the channel effective rank is maximized by optimally configuring the RIS consisting of a large number of elements.<|reference_end|>
@article{manasa2024capacity,
    title={Capacity Maximization for RIS-assisted Multi-user MISO Communication
  Systems},
    author={M. S. S. Manasa, Kali Krishna Kota, Praful D. Mankar, and Harpreet S.
  Dhillon},
    journal={arXiv preprint arXiv:2404.08909},
    year={2024},
    archivePrefix={arXiv},
    eprint={2404.08909},
    primaryClass={cs.IT math.IT}
}