基于块对角相关模型的流体天线系统性能研究
On the Performance of Fluid Antenna Systems under Block-Diagonal Correlation Model
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中文总结 AI 辅助
研究基于块对角相关模型的单输入多输出流体天线系统性能，推导精确中断概率及遍历速率表达式，得出分集阶数近似端口数等结论，仿真验证分析框架，表明其在少合并分支下中断性能良好。
中文摘要 AI 辅助
流体天线系统（FASs）因其能在紧凑孔径内利用细粒度空间信道变化的独特能力，成为未来无线网络中一种有前景的可重构天线技术。本文研究了基于块对角相关模型的单输入多输出（SIMO）FAS，采用最大比合并（MRC），端口被划分为独立块并选择每个块中最强端口进行MRC合并。首先推导了精确中断概率（OP）的卷积和特征函数形式表达式，还得出了闭式高信噪比渐近表达式，表明分集阶数近似于端口数，块划分仅影响编码增益。对于遍历速率（ER），推导了伽马匹配近似和基于詹森的更紧近似。仿真结果验证了分析框架，表明增加端口数或块数可提高系统性能，分集阶数仅取决于端口数，且该SIMO - FAS在使用更少合并分支的情况下，中断性能与传统MRC接收器相当或更优。
英文摘要
Fluid antenna systems (FASs) have recently emerged as a promising reconfigurable antenna technology for future wireless networks, owing to their unique ability to exploit fine-grained spatial channel variations within a compact aperture. In this paper, a single-input multiple-output (SIMO) FAS employing maximum-ratio combining (MRC) is investigated under the block-diagonal correlation model, where the ports of FAS are partitioned into independent blocks and the strongest port within each block is selected for MRC combining. Exact outage probability (OP) expressions are first derived in both convolution and characteristic-function forms. To gain further insights, closed-form high-SNR asymptotic expressions are developed, from which the diversity order is shown to approximate the number of ports. This result reveals that block partitioning influences only the coding gain and can therefore be optimized without compromising the diversity performance. For the ergodic rate (ER), a Gamma-matching approximation together with a tighter Jensen-based approximation is derived in closed form. Simulation results corroborate the analytical framework and demonstrate that: i) increasing either the number of ports or the number of blocks improves the system performance; ii) the diversity order depends solely on the number of ports; and iii) the proposed SIMO-FAS achieves comparable or superior outage performance to conventional MRC receivers despite employing fewer combining branches.
