Transmitter CSI-Free RIS-Randomized CUMA for Extreme Massive Connectivity

IF 6.3 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Open Journal of the Communications Society Pub Date : 2024-10-30 DOI:10.1109/OJCOMS.2024.3488503

Kai-Kit Wong

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引用次数: 0

Abstract

This paper proposes a transmitter channel state information (CSI)-free, massive connectivity scheme in the downlink that requires no optimization from the base station (BS) side. Inter-user interference is dealt with solely by the mobile users themselves, each equipped with a position-flexible fluid antenna system (FAS). Specifically, we adopt the compact ultra massive antenna (CUMA) receiver architecture at the FAS of each user, which protects the desired user’s signal from interference without the need of the interferers’ CSI. Different from previous work, we incorporate the return loss and isolation parameters into the channel model to properly reflect realistic mutual coupling countermeasures and deploy randomized reconfigurable intelligent surfaces (RISs) in the environment to restore rich scattering channel conditions. Our simulation results demonstrate that under these conditions at

$26~{\textrm {GHz}}$

, CUMA can accommodate 50 users per channel use to achieve a rate of

$45~{\textrm {bps/Hz}}$

, without power control and precoding at the BS and also no successive interference cancellation (SIC) at each user. The rate will be increased to

$54~{\textrm {bps/Hz}}$

if 100 users are served, revealing the possibility of massive connectivity without the CSI at the BS.

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发射机无 CSI RIS 随机 CUMA，实现极大规模连接

本文提出了一种无需发射机信道状态信息（CSI）的下行链路大规模连接方案，该方案无需基站（BS）方面的优化。用户间干扰完全由移动用户自己处理，每个移动用户都配备了位置灵活的流体天线系统（FAS）。具体来说，我们在每个用户的 FAS 上采用了紧凑型超大规模天线（CUMA）接收器架构，无需干扰者的 CSI 就能保护所需的用户信号免受干扰。与之前的工作不同，我们将回波损耗和隔离参数纳入信道模型，以正确反映现实中的相互耦合对策，并在环境中部署随机可重构智能表面（RIS），以还原丰富的散射信道条件。我们的仿真结果表明，在 26~{\textrm {GHz}}$ 的条件下，CUMA 每个信道可容纳 50 个用户，实现 45~{\textrm {bps/Hz}}$ 的速率，无需在 BS 进行功率控制和预编码，也无需在每个用户处进行连续干扰消除（SIC）。如果服务 100 个用户，速率将提高到 $54~{\textrm{bps/Hz}}$，这揭示了在 BS 没有 CSI 的情况下实现大规模连接的可能性。

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 Open Journal of the Communications Society Multiple-

CiteScore

13.70

自引率

3.80%

发文量

审稿时长

10 weeks

期刊介绍： The IEEE Open Journal of the Communications Society (OJ-COMS) is an open access, all-electronic journal that publishes original high-quality manuscripts on advances in the state of the art of telecommunications systems and networks. The papers in IEEE OJ-COMS are included in Scopus. Submissions reporting new theoretical findings (including novel methods, concepts, and studies) and practical contributions (including experiments and development of prototypes) are welcome. Additionally, survey and tutorial articles are considered. The IEEE OJCOMS received its debut impact factor of 7.9 according to the Journal Citation Reports (JCR) 2023. The IEEE Open Journal of the Communications Society covers science, technology, applications and standards for information organization, collection and transfer using electronic, optical and wireless channels and networks. Some specific areas covered include: Systems and network architecture, control and management Protocols, software, and middleware Quality of service, reliability, and security Modulation, detection, coding, and signaling Switching and routing Mobile and portable communications Terminals and other end-user devices Networks for content distribution and distributed computing Communications-based distributed resources control.