Rate-Splitting Assisted Cell-Free Symbiotic Radio: Channel Estimation and Transmission Scheme

IF 8.3 2区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Communications Pub Date : 2024-12-12 DOI:10.1109/TCOMM.2024.3516513

Feiyang Li;Qiang Sun;Xiaomin Chen;Shuping Dang;Jiayi Zhang;Kai-Kit Wong

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引用次数: 0

Abstract

Cell-free symbiotic radio (CF-SR) is a promising technology to meet the demands of good quality-of-service and spectrum-efficient communications. However, the introduction of SR brings additional interference terms, which can seriously degrade the performance of the CF-SR systems. To suppress the interference, we adopt a rate-splitting (RS) transmission scheme to CF-SR. In this paper, we derive downlink spectral efficiency (SE) expressions of the CF-SR system with RS. Furthermore, in a conventional two-phase (TP) channel estimation scheme, the direct link causes heavy interference to the backscatter link, consequently diminishing the accuracy of the backscatter-link channel estimation. To this end, we propose a collaborative cancellation (CC) channel estimation scheme, which can eliminate the interference from the direct link and thus improve the accuracy of the backscatter-link channel estimation. Moreover, we derive the novel closed-form SE expressions under the CC channel estimation scheme using maximum ratio (MR) precoding. Simulation results show that the normalized mean square error (NMSE) of the CC channel estimation is consistently better than the one of the TP channel estimation, both on the direct and backscatter links. Furthermore, the advantages of the CC channel estimation scheme on the backscatter link can be further amplified in scenarios with a sufficient number of pilots. In addition, simulation results demonstrate that both the CC channel estimation scheme and the RS transmission scheme can provide significant improvements.

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速率分裂辅助无细胞共生无线电：信道估计和传输方案

无蜂窝共生无线电（CF-SR）是一种很有前途的技术，可以满足良好的服务质量和频谱效率通信的需求。然而，SR的引入带来了额外的干扰项，严重降低了CF-SR系统的性能。为了抑制干扰，我们对CF-SR采用了分频（RS）传输方案。此外，在传统的两相信道估计方案中，直接链路会对反向散射链路造成严重干扰，从而降低了反向散射链路信道估计的精度。为此，我们提出了一种协同抵消（CC）信道估计方案，该方案可以消除直接链路的干扰，从而提高后向散射链路信道估计的精度。此外，我们在CC信道估计方案下，利用最大比率（MR）预编码，推导了新的封闭形式SE表达式。仿真结果表明，在直散射和反向散射链路上，CC信道估计的归一化均方误差（NMSE）始终优于TP信道估计。此外，在有足够导频的情况下，CC信道估计方案在反向散射链路上的优势可以进一步被放大。此外，仿真结果表明，CC信道估计方案和RS传输方案都有显著的改进。

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 Transactions on Communications 工程技术-电信学

CiteScore

16.10

自引率

8.40%

发文量

528

审稿时长

4.1 months

期刊介绍： The IEEE Transactions on Communications is dedicated to publishing high-quality manuscripts that showcase advancements in the state-of-the-art of telecommunications. Our scope encompasses all aspects of telecommunications, including telephone, telegraphy, facsimile, and television, facilitated by electromagnetic propagation methods such as radio, wire, aerial, underground, coaxial, and submarine cables, as well as waveguides, communication satellites, and lasers. We cover telecommunications in various settings, including marine, aeronautical, space, and fixed station services, addressing topics such as repeaters, radio relaying, signal storage, regeneration, error detection and correction, multiplexing, carrier techniques, communication switching systems, data communications, and communication theory. Join us in advancing the field of telecommunications through groundbreaking research and innovation.