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arXiv 2408.04724cs.ITeess.SPmath.IT
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FAS辅助NOMA-ISAC性能分析:一种反向散射场景

Performance Analysis of FAS-Aided NOMA-ISAC: A Backscattering Scenario

Farshad Rostami Ghadi, Kai-Kit Wong, F. Javier Lopez-Martinez, Hyundong Shin, Lajos Hanzo

AI总结:

本文研究FAS辅助NOMA-ISAC系统中的反向散射通信与感知性能,推导了信道分布、中断概率、遍历通信速率和遍历感知速率的闭式或级数表达式,并验证了流体天线系统相比固定位置天线的性能优势。

摘要:

本文研究了一个用于集成感知与通信(ISAC)的双用户下行链路系统,其中两个用户部署了流体天线系统(FAS)并采用非正交多址接入(NOMA)策略。具体而言,考虑了集成感知与反向散射通信(ISABC)模型,其中双功能基站(BS)既服务于与两个用户的通信,又感知标签周围环境。与传统ISAC不同,反向散射标签将基站发射的信号反射给NOMA用户,从而增强其通信性能。此外,基站在感知阶段从同一反向散射信号中提取环境信息。首先,利用矩匹配方法和高斯copula,推导出用户处等效信道的累积分布函数(CDF)和概率密度函数(PDF)的闭式表达式。然后在通信阶段,我们得到了中断概率的闭式表达式以及高信噪比(SNR)区域下相应的渐近表达式。此外,利用高斯-拉盖尔求积(GLQ)等数值积分技术,我们得到了用户遍历通信速率(ECR)的级数形式表达式。另外,利用克拉美-罗下界(CRLB),我们得到了遍历感知速率(ESR)的闭式表达式。最后,通过数值仿真验证了我们分析结果的准确性,并证实了在ISAC和ISABC中采用FAS相比传统固定位置天线系统的优越性。

英文摘要:

This paper investigates a two-user downlink system for integrated sensing and communication (ISAC) in which the two users deploy a fluid antenna system (FAS) and adopt the nonorthogonal multiple access (NOMA) strategy. Specifically, the integrated sensing and backscatter communication (ISABC) model is considered, where a dual-functional base station (BS) serves to communicate the two users and sense a tag's surrounding. In contrast to conventional ISAC, the backscattering tag reflects the signals transmitted by the BS to the NOMA users and enhances their communication performance. Furthermore, the BS extracts environmental information from the same backscatter signal in the sensing stage. Firstly, we derive closed-form expressions for both the cumulative distribution function (CDF) and probability density function (PDF) of the equivalent channel at the users utilizing the moment matching method and the Gaussian copula. Then in the communication stage, we obtain closed-form expressions for both the outage probability and for the corresponding asymptotic expressions in the high signal-to-noise ratio (SNR) regime. Moreover, using numerical integration techniques such as the Gauss-Laguerre quadrature (GLQ), we have series-form expressions for the user ergodic communication rates (ECRs). In addition, we get a closed-form expression for the ergodic sensing rate (ESR) using the Cramer-Rao lower bound (CRLB). Finally, the accuracy of our analytical results is validated numerically, and we confirm the superiority of employing FAS over traditional fixed-position antenna systems in both ISAC and ISABC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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