基于高相关端口的HARQ-CC辅助慢流体天线多址：基于LST的性能分析
HARQ-CC-Aided Slow Fluid Antenna Multiple Access with Highly Correlated Ports: An LST-Based Performance Analysis
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中文总结 AI 辅助
本文针对高相关端口的HARQ-CC辅助慢流体天线多址，提出两种SIR及LST近似方法，推导BR-AS和FPA闭式表达式，评估多轮性能，所得FAS接收机优于基准，增益在强干扰下趋缓。
中文摘要 AI 辅助
采用合并重传的混合自动重传请求（HARQ-CC）通过多轮合并提升慢流体天线多址（sFAMA）的可靠性。但现有分析未充分利用密集间隔、高相关流体天线系统（FAS）端口的结构来推导易处理的单轮特性，导致计算过程密集。本文重新研究采用密集间隔、高相关FAS配置的下行链路HARQ-CC辅助sFAMA。在空间块相关模型下，我们首先针对单轮选端口信干噪比（SIR）分布及其拉普拉斯-斯蒂尔杰斯变换（LST），构建两种经有效性修正的高相关近似：Marcum-Q核路径和低复杂度阶跃阈值路径。同时针对块代表性天线选择（BR-AS）和固定位置天线（FPA）获得闭式表达式。随后，利用单轮特性通过SIR域斯蒂尔杰斯卷积和数值LST反演评估多轮累积SIR分布，得到中断概率、平均传输次数和有效载荷吞吐量。数值结果显示两种评估方法吻合度高；分析所得FAS结果相较于仿真偏保守，但保留了性能趋势和接收机排序；FAS接收机始终优于基准方案，而在严重多用户干扰下，提高HARQ传输上限带来的有效载荷吞吐量增益变得微不足道。
英文摘要
Hybrid automatic repeat request with chase combining (HARQ-CC) improves the reliability of slow fluid antenna multiple access (sFAMA) through multi-round combining. However, existing analysis has not fully utilized the structure of densely spaced and highly correlated fluid antenna system (FAS) ports to derive tractable per-round characterizations, thereby maintaining a computationally intensive process. This paper re-investigates downlink HARQ-CC-aided sFAMA with densely-spaced and highly-correlated FAS configuration. Under a spatial block correlation model, we first formulate two validity-corrected high-correlation approximations for the per-round selected-port signal-to-interference ratio (SIR) distribution and its Laplace--Stieltjes transform (LST): a Marcum-Q-kernel route and a lower-complexity step-threshold route. Closed-form expressions are also obtained for block-representative antenna selection (BR-AS) and fixed-position antenna (FPA). Then, the per-round characteristics are used to evaluate the multi-round accumulated-SIR distribution through SIR-domain Stieltjes convolution and numerical LST inversion, yielding the outage probability, average number of transmissions, and payload throughput. Numerical results show close agreement between the two evaluation methods. The analytical FAS results are conservative relative to simulation but preserve the performance trends and receiver ordering. The FAS receiver consistently outperforms the benchmarks, while the payload-throughput gain from increasing the HARQ transmission limit becomes marginal under severe multiuser interference.
