Uplink–Downlink Cochannel Interference Cancellation in RIS-Aided Full-Duplex Networks

IF 4 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Systems Journal Pub Date : 2024-04-02 DOI:10.1109/JSYST.2024.3379438

Radwa Sultan;Ahmed Shamseldeen

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Abstract

We consider a single-cell full-duplex (FD) network. In FD transmission, the downlink rate is degraded by the cochannel interference (CCI) from the active uplink transmission. In this letter, we study how utilizing reconfigurable intelligent surfaces (RIS) can mitigate the effects of the CCI. In a multiple-input-multiple-output (MIMO) network, we consider two scenarios for CCI cancellation. In the first scenario, we assume that both the RIS-base station uplink and downlink direct links suffer from deep fading, i.e., they do not exist. In that case, the CCI minimization problem will be cast as an unconstrained manifold optimization problem. In the second scenario, we assume that the RIS-base station uplink and downlink direct links exist and the RIS controls all the network's links. In that case, the CCI minimization problem will be constrained by the uplink and the downlink channel gains, and accordingly, a penalty-based approach will be adopted to solve the CCI minimization problem. Our results show that utilizing the RIS can be very effective in minimizing the CCI and achieving a higher downlink rate than benchmark schemes.

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RIS 辅助全双工网络中的上行链路-下行链路 Cochannel 干扰消除

我们考虑的是单蜂窝全双工（FD）网络。在 FD 传输中，下行链路速率会因主动上行链路传输的同信道干扰（CCI）而降低。在这封信中，我们研究了如何利用可重构智能表面（RIS）来减轻 CCI 的影响。在多输入多输出（MIMO）网络中，我们考虑了两种消除 CCI 的方案。在第一种情况下，我们假设 RIS-基站上行链路和下行链路的直接链路都存在深度衰落，即不存在深度衰落。在这种情况下，CCI 最小化问题将被视为一个无约束流形优化问题。在第二种情况下，我们假设 RIS 与基站之间存在上行和下行直接链路，并且 RIS 控制着网络的所有链路。在这种情况下，CCI 最小化问题将受到上行链路和下行链路信道增益的限制，因此将采用基于惩罚的方法来解决 CCI 最小化问题。我们的研究结果表明，与基准方案相比，利用 RIS 可以非常有效地最小化 CCI，并获得更高的下行链路速率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Systems Journal 工程技术-电信学

CiteScore

9.80

自引率

6.80%

发文量

572

审稿时长

4.9 months

期刊介绍： This publication provides a systems-level, focused forum for application-oriented manuscripts that address complex systems and system-of-systems of national and global significance. It intends to encourage and facilitate cooperation and interaction among IEEE Societies with systems-level and systems engineering interest, and to attract non-IEEE contributors and readers from around the globe. Our IEEE Systems Council job is to address issues in new ways that are not solvable in the domains of the existing IEEE or other societies or global organizations. These problems do not fit within traditional hierarchical boundaries. For example, disaster response such as that triggered by Hurricane Katrina, tsunamis, or current volcanic eruptions is not solvable by pure engineering solutions. We need to think about changing and enlarging the paradigm to include systems issues.