# Reconfigurable Intelligent Surface (RIS)-Enhanced Two-Way OFDM Communications

arXiv: https://arxiv.org/abs/2005.01910 · HTML: https://mlsanity.com/paper/2005.01910/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 5 May 2020.

## Built on by (most cited first, 1 of 1)

- [Deep Reinforcement Learning for Intelligent Reflecting Surface-assisted D2D Communications](https://mlsanity.com/paper/2108.02892/) (2021)

## Abstract (arXiv)

In this paper, we focus on the reconfigurable intelligent surface (RIS)-enhanced two-way device-to-device (D2D) multi-pair orthogonal-frequency-division-multiplexing (OFDM) communication systems. Specifically, we maximize the minimum bidirectional weighted sum-rate by jointly optimizing the sub-band allocation, the power allocation and the discrete phase shift (PS) design at the RIS. To tackle the main difficulty of the non-convex PS design at the RIS, we firstly formulate a semi-definite relaxation problem and further devise a low-complexity solution for the PS design by leveraging the projected sub-gradient method. We demonstrate the desirable performance gain for the proposed designs through numerical results.