标题： 优化流体天线配置以实现建设性干扰预编码 显示英文标题

标题： Optimizing Fluid Antenna Configurations for Constructive Interference Precoding

摘要： 流体天线系统（FAS）作为一种新的物理层概念出现，以在传统固定阵列上为多用户多输入多输出（MIMO）通信提供增强的传播条件。 本工作专注于在配备FAS的多用户下行链路中，通过$M$进制相移键控（MPSK）信号传输，在每个天线在非重叠区间内移动的情况下，最小化最大符号错误概率（SEP）。 与FAS和建设性干扰（CI）预编码联合SEP最小化这一具体问题之前尚未被研究过。 结果表明，这个问题是一个非凸且非光滑的优化挑战。 我们将SEP最小化问题转化为建设性干扰预编码中的安全裕度最大化问题。 然后，我们定制了一种平滑技术以及一种块坐标下降（BCD）算法，重点在于低计算复杂度。 仿真结果表明，与固定阵列以及现有粒子群优化（PSO）设计的FAS相比，我们的方法可以降低比特错误率（BER）。 此外，与PSO基准相比，我们的方法显示出具有吸引力的低计算复杂度。 显示英文摘要

摘要： The fluid antenna system (FAS) has emerged as a new physical-layer concept to provide enhanced propagation conditions for multiuser multiple-input multiple-output (MIMO) communications over conventional fixed arrays. This work focuses on minimizing the maximum symbol error probability (SEP) under $M$-ary phase shift keying (MPSK) signaling in a multiuser downlink equipped with FAS, where each antenna moves within nonoverlapping intervals. This specific problem of joint SEP minimization with FAS and constructive interference (CI) precoding has not been previously addressed. The resulting problem turns out to be a nonconvex and nonsmooth optimization challenge. We transform the SEP minimization problem into a safety margin maximization problem in constructive interference precoding. Then, we customize a smoothing technique and a block coordinate descent (BCD) algorithm, with emphasis on low computational complexity. Simulation results show that our approach can reduce bit error rate (BER) compared to both the fixed arrays and FAS designed by existing particle swarm optimization (PSO). Also, our approach shows attractively low computational complexity compared to PSO benchmarks.